SP3222EB / SP3232EB Data Sheet True +3.0V to +5.5V RS-232 Transceivers General Description Features The SP3222EB and SP3232EB series are RS-232 transceiver solutions intended for portable or hand-held applications such as notebook or laptop computers. The SP3222EB / SP3232EB series has a high-efficiency, charge-pump power supply that requires only 0.1F capacitors in 3.3V operation. This charge pump allows the SP3222EB / SP3232EB series to deliver true RS-232 performance from a single power supply ranging from 3.0V to 5.5V. The SP3222EB / SP3232EB are 2-driver / 2-receiver devices. The ESD tolerance of the SP3222EB / SP3232E devices is over 15kV for both Human Body Model and IEC61000-4-2 Air discharge test methods. The SP3222EB device has a low-power shutdown mode where the devices' driver outputs and charge pumps are disabled. During shutdown, the supply current falls to less than 1A. Meets true EIA / TIA-232-F standards from a 3.0V to 5.5V power supply 250kbps transmission rate under load 1A low power shutdown with receivers active (SP3222EB) Interoperable with RS-232 down to a 2.7V power source Enhanced ESD specifications: 15kV Human Body Model 15kV IEC61000-4-2 Air Discharge 8kV IEC61000-4-2 Contact Discharge Ordering Information - page 18 Selection Table Table 1: Selection Table Power Supplies RS-232 Drivers RS-232 Receivers External Components Shutdown TTL 3-State # of Pins SP3222EB 3.0V to 5.5V 2 2 4 Capacitors Yes Yes 20 SP3232EB 3.0V to 5.5V 2 2 4 Capacitors No No 16 Device 18 GND C1- 4 17 C2+ 5 SP3222EB 16 C2- 6 15 R1OUT V- 7 14 T2OUT R2IN 16 15 14 13 15 GND C1- 1 C2+ 2 T1OUT C1- 3 R1IN C2+ 4 C2- 5 12 R1OUT N.C. V- 6 11 T1IN 5 8 13 T1IN T2OUT 7 10 9 12 T2IN R2IN 8 9 T2OUT R2IN V+ 2 16 VCC R2OUT 10 11 SSOP / TSSOP 14 T1OUT SP3232EB 13 R1IN T2IN R2OUT C2- 3 V- 4 SP3232EB SSOP / NSOIC / TSSOP 12 T1OUT 11 R1IN 10 R1OUT 9 6 7 8 N.C. Figure 1: SP3222EB and SP3232EB Pinouts * www.maxlinear.com* Rev 1.0.7 V CC C1+ 1 3 T2IN 19 VCC V+ R2OUT C1+ 2 GND 20 SHDN 1 V+ EN C1+ Pinouts QFN T1IN SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Revision History Revision History Revision Release Date -- 11/2/05 Legacy Sipex Datasheet 1.0.0 9/9/09 Convert to Exar Format. Update ordering information and change revision to 1.0.0. 1.0.1 6/7/11 Remove obsolete devices per PDN 110510-01 and change ESD rating to IEC-61000-4-2.. 1.0.2 3/14/13 Correct ype error to RX input voltage range and TX transition region slew rate condition. 1.0.3 8/14/14 Add Max Junction temperature and package thermal information. 1.0.4 5/28/15 Update Absolute Max Rating for RxIN input voltage to 25V, update logo. 1.0.5 10/27/15 Add SP3232EBER (QFN 16) preliminary package option. 1.0.6 2/23/16 Remove preliminary status of QFN 16 package option. 1.0.7 1/24/20 Update to MaxLinear template and logo. Update Ordering Information. Remove obsolete WSOIC references. Move ESD tolerance levels to new ESD Ratings section located on page 1. 1/24/20 Change Description Rev 1.0.7 ii SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Table of Contents Table of Contents General Description............................................................................................................................................. i Features............................................................................................................................................................... i Selection Table ................................................................................................................................................... i Pinouts.................................................................................................................................................................. i Specifications ..................................................................................................................................................... 1 Absolute Maximum Ratings...........................................................................................................................................1 ESD Ratings ..................................................................................................................................................................1 Operating Conditions.....................................................................................................................................................2 Electrical Characteristics ...............................................................................................................................................2 Typical Performance Characteristics................................................................................................................ 4 Pin Information ................................................................................................................................................... 5 Pin Configurations ........................................................................................................................................................ 5 Pin Descriptions ............................................................................................................................................................5 Typical Operating Circuits ................................................................................................................................. 6 Description .......................................................................................................................................................... 7 Theory of Operation ..................................................................................................................................................... 7 Drivers ..................................................................................................................................................................7 Receivers .............................................................................................................................................................8 Charge Pump .......................................................................................................................................................8 ESD Tolerance ...................................................................................................................................................10 Mechanical Dimensions ................................................................................................................................... 12 SSOP20 ......................................................................................................................................................................12 SSOP16 ......................................................................................................................................................................13 TSSOP16 ....................................................................................................................................................................15 TSSOP20 ....................................................................................................................................................................16 QFN16 5x5 ..................................................................................................................................................................17 Ordering Information........................................................................................................................................ 18 1/24/20 Rev 1.0.7 iii SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet List of Figures List of Figures Figure 1: SP3222EB and SP3232EB Pinouts ....................................................................................................... i Figure 2: Transmitter Output Voltage vs. Load Capacitance................................................................................ 4 Figure 3: Slew Rate vs. Load Capacitance........................................................................................................... 4 Figure 4: Supply Current vs. Load Capacitance When Transmitting Data ........................................................... 4 Figure 5: Supply Current vs. Supply Voltage........................................................................................................ 4 Figure 6: Transmitter Output Voltage vs. Supply Voltage..................................................................................... 4 Figure 7: Pinout Configurations for the SP3222EB and SP3232EB..................................................................... 5 Figure 8: SP3222EB Typical Operating Circuit..................................................................................................... 6 Figure 9: SP3232EB Typical Operating Circuit..................................................................................................... 6 Figure 10: SP3222EB / SP3232EB Driver Loopback Test Circuit ........................................................................ 7 Figure 11: Loopback Test Results at 120kbps ..................................................................................................... 7 Figure 12: Loopback Test Results at 250kbps ..................................................................................................... 8 Figure 13: Charge Pump -- Phase 1.................................................................................................................... 9 Figure 14: Charge Pump -- Phase 2.................................................................................................................... 9 Figure 15: Charge Pump Waveforms ................................................................................................................... 9 Figure 16: Charge Pump -- Phase 3.................................................................................................................... 9 Figure 17: Charge Pump -- Phase 4.................................................................................................................... 9 Figure 18: ESD Test Circuit for Human Body Model .......................................................................................... 10 Figure 19: ESD Test Circuit for IEC61000-4-2 ................................................................................................... 10 Figure 20: ESD Test Waveform for IEC61000-4-2 ............................................................................................. 11 Figure 21: Mechanical Dimensions, SSOP20..................................................................................................... 12 Figure 22: Mechanical Dimensions, SSOP16..................................................................................................... 13 Figure 23: Mechanical Dimensions, NSOIC16 ................................................................................................... 14 Figure 24: Mechanical Dimensions, TSSOP16 .................................................................................................. 15 Figure 25: Mechanical Dimensions, TSSOP20 .................................................................................................. 16 Figure 26: Mechanical Dimensions, QFN16 5x5 ................................................................................................ 17 1/24/20 Rev 1.0.7 iv SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet List of Tables List of Tables Table 1: Selection Table ........................................................................................................................................ i Table 1: Absolute Maximum Ratings .................................................................................................................... 1 Table 2: ESD Ratings ........................................................................................................................................... 1 Table 3: Operating Conditions .............................................................................................................................. 2 Table 4: Electrical Characteristics ....................................................................................................................... 2 Table 5: Pin Descriptions...................................................................................................................................... 5 Table 6: SP3222EB Truth Table Logic for Shutdown and Enable Control ........................................................... 8 Table 7: Ordering Information............................................................................................................................. 18 1/24/20 Rev 1.0.7 v SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Specifications Specifications Absolute Maximum Ratings Important: These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. Table 1: Absolute Maximum Ratings Parameter Minimum Maximum Units VCC -0.3 6.0 V V+(1) -0.3 7.0 V V-(1) -7.0 0.3 V 13 V -100 100 mA TxIN, EN -0.3 6.0 V RxIN -25 25 V TxOUT -13.2 13.2 V RxOUT -0.3 VCC + 0.3 V V+ + |V-|(1) ICC (DC VCC or GND current) Input Voltages Output Voltages Short-Circuit Duration TxOUT Continuous Temperature Storage temperature -65 150 C 1. V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. 2. Driver input hysteresis is typically 250mV. ESD Ratings Table 2: ESD Ratings Parameter HBM (Human Body Model), driver outputs and receiver inputs Value Units 15 kV IEC61000-4-2 Air Discharge, driver outputs and receiver inputs Level 4 15 kV IEC61000-4-2 Contact Discharge, driver outputs and receiver inputs Level 4 8 kV 1/24/20 Rev 1.0.7 1 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Operating Conditions Operating Conditions Table 3: Operating Conditions Parameter Value Units 125 C 20-pin SSOP (derate 9.25mW/C above 70C) 750 mW 20-pin TSSOP (derate 11.1mW/C above 70C) 890 mW 16-pin SSOP (derate 9.69mW/C above 70C) 775 mW 16-pin TSSOP (derate 10.5mW/C above 70C) 850 mW 16-pin NSOIC (derate 13.57mW/C above 70C) 1086 mW 16-pin TSSOP JA 100.4 C/W 16-pin TSSOP JC 19.0 C/W 16-pin QFN JA 44.0 C/W 16-pin QFN JC 7.3 C/W Temperature Maximum junction temperature Power Dissipation Per Package Thermal Resistance Electrical Characteristics Unless otherwise noted, the following specifications apply for VCC = 3.0V to 5.5V with TAMB = TMIN to TMAX, C1 - C4 = 0.1F. Table 4: Electrical Characteristics Parameter Test Condition Minimum Typical Maximum Units DC Characteristics Supply current No load, VCC = 3.3V, TAMB= 25C, TxIN = GND or VCC 0.3 1.0 mA Shutdown supply current SHDN = GND, VCC = 3.3V, TAMB= 25C, TxIN = VCC or GND 1.0 10 A GND 0.8 V Logic Inputs and Receiver Outputs Input logic threshold LOW TxIN, EN, SHDN(1) Input logic threshold HIGH VCC = 3.3V(1) 2.0 VCC V Input logic threshold HIGH VCC = 5.0V(1) 2.4 VCC V Input leakage current TxIN, EN, SHDN, TAMB= 25C, VIN = 0V to VCC 0.01 1.0 A Output leakage current Receivers disabled, VOUT = 0V to VCC 0.05 10 A Output voltage LOW IOUT = 1.6mA 0.4 V Output voltage HIGH IOUT = -1.0mA VCC - 0.6 VCC - 0.1 V Driver Outputs 1/24/20 Rev 1.0.7 2 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Electrical Characteristics Table 4: (Continued) Electrical Characteristics Parameter Test Condition Minimum Typical Output voltage swing All driver outputs loaded with 3k to GND, TAMB= 25C 5.0 5.4 Output resistance VCC = V+ = V- = 0V, to VOUT = 2V 300 Output Short-circuit current VOUT = 0V Output leakage current VCC = 0V or 3.0V to 5.5V, VOUT = 12V, drivers disabled Maximum Units V 35 60 mA 25 A 15 V Receiver Inputs Input voltage range -15 Input threshold LOW VCC = 3.3V 0.6 1.2 V Input threshold LOW VCC = 5.0V 0.8 1.5 V Input threshold HIGH VCC = 3.3V 1.5 2.4 V Input threshold HIGH VCC = 5.0V 1.8 2.4 V Input hysteresis 0.3 Input resistance 3 5 V 7 k Timing Characteristics Maximum data rate RL = 3k, CL = 1000pF, one driver active Receiver propagation delay, tPHL Receiver input to receiver output, CL = 150pF 0.15 s Receiver propagation delay, tPLH Receiver input to receiver output, CL = 150pF 0.15 s Receiver output enable time 200 ns Receiver output disable time 200 ns 250 kbps Driver skew |tPHL- tPLH|, TAMB= 25C 100 ns Receiver skew |tPHL- tPLH| 50 ns Transition-region slew rate VCC = 3.3V, RL = 3k, CL = 1000pF, TAMB= 25C, measurements taken from -3.0V to +3.0V or +3.0V to -3.0V 30 V/s 1. Driver input hysteresis is typically 250mV. 1/24/20 Rev 1.0.7 3 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Typical Performance Characteristics Typical Performance Characteristics 30 6 4 25 Slew rate (V/s) TxOUT+ Transmitter Output Voltage (V) 2 T1 at 250Kbps 0 T2 at 15.6Kbps All TX loaded 3K // CLoad -2 TxOUT - -4 -6 - Slew + Slew 20 15 10 T1 at 250Kbps T2 at 15.6Kbps 5 0 1000 2000 3000 4000 0 5000 All TX loaded 3K // CLoad 0 500 Load Capacitance (pF) 2000 3000 4000 5000 Load Capacitance (pF) Figure 3: Slew Rate vs. Load Capacitance Figure 2: Transmitter Output Voltage vs. Load Capacitance 35 16 T1 at Full Data Rate T2 at 1/16 Data Rate 14 250Kbps Supply Current (mA) 30 Supply Current (mA) 1000 All TX loaded 3K // CLoad 25 20 125Kbps 15 20Kbps 10 5 12 10 8 6 1 Transmitter at 250Kbps 4 1 Transmitter at 15.6Kbps All transmitters loaded with 3K // 1000pf 2 0 0 1000 2000 3000 4000 0 5000 2.7 3 Load Capacitance (pF) 3.5 4 4.5 5 Supply Voltage (V) Figure 4: Supply Current vs. Load Capacitance When Transmitting Data Figure 5: Supply Current vs. Supply Voltage 6 TxOUT+ Transmitter Output Voltage (V) 4 2 T1 at 250Kbps T2 at 15.6Kbps 0 All TX loaded 3K // 1000 pF -2 -4 -6 TxOUT - 2.7 3 3.5 4 4.5 5 Supply Voltage (V) Figure 6: Transmitter Output Voltage vs. Supply Voltage 1/24/20 Rev 1.0.7 4 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Pin Information Pin Information 18 GND C1- 4 17 C2+ 5 SP3222EB 16 C2- 6 15 R1OUT V- 7 14 T2OUT R2IN V+ 2 15 GND 16 15 14 13 C1- 1 C2+ 2 T1OUT C1- 3 R1IN C2+ 4 C2- 5 12 R1OUT N.C. V- 6 11 T1IN 5 8 13 T1IN T2OUT 7 10 9 12 T2IN R2IN 8 9 R2OUT 10 11 14 T1OUT SP3232EB 13 R1IN C2- 3 V- 4 SP3232EB 12 T1OUT 11 R1IN 10 R1OUT 9 T2IN R2OUT 6 7 8 T2IN 3 16 VCC T2OUT R2IN V+ C1+ 1 V CC 19 VCC R2OUT C1+ 2 20 SHDN V+ 1 C1+ EN GND Pin Configurations T1IN N.C. SSOP / NSOIC / TSSOP SSOP / TSSOP QFN Figure 7: Pinout Configurations for the SP3222EB and SP3232EB Pin Descriptions Table 5: Pin Descriptions Pin Number Pin Name Function / Description EN SP3222EB SP3232EB SSOP TSSOP SSOP TSSOP NSOIC QFN Receiver enable. Apply logic LOW for normal operation. Apply logic HIGH to disable the receiver outputs (high-Z state). 1 - - C1+ Positive terminal of the voltage doubler charge-pump capacitor. 2 1 15 V+ 5.5V output generated by the charge pump. 3 2 16 C1- Negative terminal of the voltage doubler charge-pump capacitor. 4 3 1 C2+ Positive terminal of the inverting charge-pump capacitor. 5 4 2 C2- Negative terminal of the inverting charge-pump capacitor. 6 5 3 V- -5.5V output generated by the charge pump. 7 6 4 T1OUT RS-232 driver output. 17 14 12 T2OUT RS-232 driver output. 8 7 5 R1IN RS-232 receiver input. 16 13 11 R2IN RS-232 receiver input. 9 8 6 R1OUT TTL / CMOS receiver output. 15 12 10 1/24/20 Rev 1.0.7 5 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Typical Operating Circuits Table 5: Pin Descriptions Pin Number Pin Name Function / Description R2OUT SP3222EB SP3232EB SSOP TSSOP SSOP TSSOP NSOIC QFN TTL / CMOS receiver output. 10 9 7 T1IN TTL / CMOS driver input. 13 11 9 T2IN TTL / CMOS driver input. 12 10 8 GND Ground. 18 15 13 VCC 3.0V to 5.5V supply voltage. 19 16 14 SHDN Shutdown control Input. Drive HIGH for normal device operation. Drive LOW to shutdown the drivers (high-Z output) and the on-board power supply. 20 - - N. C. No connect. 11, 14 - - Typical Operating Circuits V CC V CC C5 C1 C2 LOGIC INPUTS + + 0.1F 2 C1+ 0.1 F 0.1F C5 V+ *C3 6 C2- SP3222EB SSOP TSSOP V- 13 T1IN T1OUT 12 T2IN T2OUT R1IN 17 8 R2IN 0.1F C1 + 0.1F 1 C1+ 0.1F + 0.1F RS-232 OUTPUTS C2 LOGIC INPUTS 9 + 0.1F 16 V CC V+ *C3 SP3232EB LOGIC OUTPUTS C4 11 T1IN T1OUT 14 10 T2IN T2OUT 7 0.1F 13 R2IN 8 + 0.1F RS-232 OUTPUTS RS-232 INPUTS 5k SHDN GND 18 R1IN 5k 9 R2OUT + 6 5 C2- 5k 1 EN V- 12 R1OUT RS-232 INPUTS 2 3 C14 C2+ 16 5k 10 R2OUT + + 7 C4 15 R1OUT LOGIC OUTPUTS 3 4 C15 C2+ + 19 V CC 20 *can be returned to either V CC or GND GND 15 *can be retur ned to either V CC or GND Figure 9: SP3232EB Typical Operating Circuit Figure 8: SP3222EB Typical Operating Circuit . 1/24/20 Rev 1.0.7 6 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Description Description The SP3222EB / SP3232EB transceivers meet the EIA / TIA-232 and ITU-T V.28/V.24 communication protocols and can be implemented in battery-powered, portable, or hand-held applications such as notebook or palmtop computers. The SP3222EB / SP3232EB devices feature MaxLinear's proprietary on-board charge pump circuitry that generates 5.5V for RS-232 voltage levels from a single 3.0V to 5.5V power supply. This series is ideal for 3.3V-only systems, mixed 3.3V to 5.5V systems, or 5.0V-only systems that require true RS-232 performance. The SP3222EB / SP3232EB devices can operate at a data rate of 250kbps when fully loaded. Figure 10 shows a loopback test circuit used to test the RS-232 Drivers. Figure 11 shows the test results of the loopback circuit with all drivers active at 120kbps with RS232 loads in parallel with a 1000pF capacitor. Figure 12 shows the test results where one driver was active at 250kbps and all drivers loaded with an RS-232 receiver in parallel with 1000pF capacitors. A solid RS-232 data transmission rate of 250kbps provides compatibility with many designs in personal computer peripherals and LAN applications. VCC The SP3222EB and SP3232EB are 2-driver / 2-receiver devices ideal for portable or hand-held applications. The SP3222EB features a 1A shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1A supply current. C5 C1 + + 0.1F VCC C1+ V+ + 0.1F C1- C2 + C2+ 0.1F SP3222EB SP3232EB VC4 C2- Theory of Operation LOGIC INPUTS The SP3222EB/SP3232EB series is made up of three basic circuit blocks: 0.1F C3 LOGIC OUTPUTS 1. Drivers + 0.1F TxOUT TxIN RxIN RxOUT 5k EN* *SHDN 2. Receivers VCC GND 3. The MaxLinear proprietary charge pump 1000pF Drivers * SP3222EB only The drivers are inverting level transmitters that convert TTL or CMOS logic levels to 5.0V EIA / TIA-232 levels with an inverted sense relative to the input logic levels. Typically, the RS-232 output voltage swing is 5.4V with no load and 5V minimum fully loaded. The driver outputs are protected against infinite short-circuits to ground without degradation in reliability. Driver outputs will meet EIA / TIA-562 levels of 3.7V with supply voltages as low as 2.7V. Figure 10: SP3222EB / SP3232EB Driver Loopback Test Circuit The drivers can guarantee a data rate of 250kbps fully loaded with 3k in parallel with 1000pF, ensuring compatibility with PC-to-PC communication software. The slew rate of the driver is internally limited to a maximum of 30V/s in order to meet the EIA standards (EIA RS-232D 2.1.7, Paragraph 5). The transition of the loaded output from HIGH to LOW also meet the monotonicity requirements of the standard. 1/24/20 Figure 11: Loopback Test Results at 120kbps Rev 1.0.7 7 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Theory of Operation Since receiver input is usually from a transmission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 300mV. This ensures that the receiver is virtually immune to noisy transmission lines. Should an input be left unconnected, an internal 5k pulldown resistor to ground will commit the output of the receiver to a HIGH state. Charge Pump Figure 12: Loopback Test Results at 250kbps The SP3222EB driver's output stages are turned off (tristate) when the device is in shutdown mode. When the power is off, the SP3222EB device permits the outputs to be driven up to 12V. The driver's inputs do not have pullup resistors. Designers should connect unused inputs to VCC or GND. In the shutdown mode, the supply current falls to less than 1A, where SHDN = LOW. When the SP3222EB device is shut down, the device's driver outputs are disabled (tristated) and the charge pumps are turned off with V+ pulled down to VCC and V- pulled to GND. The time required to exit shutdown is typically 100s. Connect SHDN to VCC if the shutdown mode is not used. Receivers The receivers convert EIA / TIA-232 levels to TTL or CMOS logic output levels. The SP3222EB receivers have an inverting tri-state output. These receiver outputs (RxOUT) are tri-stated when the enable control EN = HIGH. In the shutdown mode, the receivers can be active or inactive. EN has no effect on TxOUT. The truth table logic of the SP3222EB driver and receiver outputs can be found in Table 6. In most circumstances, decoupling the power supply can be achieved adequately using a 0.1F bypass capacitor at C5 (refer to Figure 8 and Figure 9). In applications that are sensitive to power-supply noise, decouple VCC to ground with a capacitor of the same value as charge-pump capacitor C1. Physically connect bypass capacitors as close to the IC as possible. The charge pump operates in a discontinuous mode using an internal oscillator. If the output voltages are less than a magnitude of 5.5V, the charge pump is enabled. If the output voltages exceed a magnitude of 5.5V, the charge pump is disabled. This oscillator controls the four phases of the voltage shifting. A description of each phase follows. Phase 1: VSS charge storage During this phase of the clock cycle, the positive side of capacitors C1 and C2 are initially charged to VCC. Cl+ is then switched to GND and the charge in C1- is transferred to C2-. Since C2+ is connected to VCC, the voltage potential across capacitor C2 is now 2 times VCC. Phase 2: VSS transfer Table 6: SP3222EB Truth Table Logic for Shutdown and Enable Control SHDN EN TxOUT RxOUT 0 0 Tri-state Active 0 1 Tri-state Tri-state 1 0 Active Active 1 1 Active Tri-state 1/24/20 The charge pump is an MaxLinear-patented design (U.S. 5,306,954) and uses a unique approach compared to older less-efficient designs. The charge pump still requires four external capacitors, but uses a four-phase voltage shifting technique to attain symmetrical 5.5V power supplies. The internal power supply consists of a regulated dual charge pump that provides output voltages of 5.5V regardless of the input voltage (VCC) over the 3.0V to 5.5V range. Phase two of the clock connects the negative terminal of C2 to the VSS storage capacitor and the positive terminal of C2 to GND. This transfers a negative generated voltage to C3. This generated voltage is regulated to a minimum voltage of -5.5V. Simultaneous with the transfer of the voltage to C3, the positive side of capacitor C1 is switched to VCC and the negative side is connected to GND. Rev 1.0.7 8 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Theory of Operation Phase 3: VDD charge storage [ The third phase of the clock is identical to the first phase; the charge transferred in C1 produces -VCC in the negative terminal of C1, which is applied to the negative side of T ] +6V a) C2+ + capacitor C2. Since C2 is at VCC, the voltage potential across C2 is 2 times VCC. T GND 1 GND 2 Phase 4: VDD transfer The fourth phase of the clock connects the negative terminal of C2 to GND, and transfers this positive generated voltage across C2 to C4, the VDD storage capacitor. This voltage is regulated to 5.5V. At this voltage, the internal oscillator is disabled. Simultaneous with the transfer of the voltage to C4, the positive side of capacitor C1 is switched to VCC and the negative side is connected to GND, allowing the charge pump cycle to begin again. The charge pump cycle will continue as long as the operational conditions for the internal oscillator are present. Since both V+ and V- are separately generated from VCC, in a no-load condition V+ and V- will be symmetrical. Older charge pump approaches that generate V- from V+ will show a decrease in the magnitude of V- compared to V+ due to the inherent inefficiencies in the design. b) C2T -6V Ch1 2.00V Ch2 2.00V M 1.00s Ch1 5.48V Figure 15: Charge Pump Waveforms VCC = +5V +5V C1 + C2 - -5V C4 + - - + + - VDD Storage Capacitor VSS Storage Capacitor C3 -5V Figure 16: Charge Pump -- Phase 3 The clock rate for the charge pump typically operates at greater than 250kHz. The external capacitors can be as low as 0.1F with a 16V breakdown voltage rating. VCC = +5V +5.5V C1 VCC = +5V + - C2 C4 + - - + + - VDD Storage Capacitor VSS Storage Capacitor C3 +5V C1 + C2 - -5V C4 + - - + + - VDD Storage Capacitor VSS Storage Capacitor Figure 17: Charge Pump -- Phase 4 C3 -5V Figure 13: Charge Pump -- Phase 1 VCC = +5V C4 C1 + - C2 + - - + + - -5.5V VDD Storage Capacitor VSS Storage Capacitor C3 Figure 14: Charge Pump -- Phase 2 1/24/20 Rev 1.0.7 9 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Theory of Operation ESD Tolerance The SP3222EB / SP3232EB Series incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least 15kV without damage nor latch-up. Contact-Discharge Model RS RC SW1 DC Power Source RV SW2 Device Under Test CS There are different methods of ESD testing applied: a. MIL-STD-883, Method 3015.7 R S and RV add up to 330 for IEC61000-4-2. b. IEC61000-4-2 Air-Discharge c. IEC61000-4-2 Direct Contact Figure 19: ESD Test Circuit for IEC61000-4-2 The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specified in MIL-STD-883, Method 3015.7 for ESD testing. The premise of this ESD test is to simulate the human body's potential to store electro-static energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 18. This method will test the IC's capability to withstand an ESD transient during normal handling such as in manufacturing areas where the IC's tend to be handled frequently. RS RC SW1 DC Power Source SW2 CS Device Under Test Figure 18: ESD Test Circuit for Human Body Model The IEC61000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and systems. System manufacturers must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. The premise with IEC61000-4-2 is that the system is required to withstand an amount of static electricity when ESD is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. The test circuit for IEC61000-4-2 is shown on Figure 19. There are two methods within IEC61000-4-2, the Air Discharge method and the Contact Discharge method. 1/24/20 With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the ESD potential to the system and humidity will tend to change the discharge current. For example, the rise time of the discharge current varies with the approach speed. The Contact Discharge Method applies the ESD current directly to the EUT. This method was devised to reduce the unpredictability of the ESD arc. The discharge current rise time is constant since the energy is directly transferred without the air-gap arc. In situations such as hand held systems, the ESD charge can be directly discharged to the equipment from a person already holding the equipment. The current is transferred on to the keypad or the serial port of the equipment directly and then travels through the PCB and finally to the IC. The circuit model in Figure 18 and Figure 19 represent the typical ESD testing circuit used for all three methods. The CS is initially charged with the DC power supply when the first switch (SW1) is on. Now that the capacitor is charged, the second switch (SW2) is on while SW1 switches off.The voltage stored in the capacitor is then applied through RS, the current limiting resistor, onto the device under test (DUT). In ESD tests, the SW2 switch is pulsed so that the device under test receives a duration of voltage. Rev 1.0.7 10 For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5k and 100pF, respectively. For IEC-61000-4-2, the current limiting resistor (RS) and the source capacitor (CS) are 330 and 150pF, respectively. The higher CS value and lower RS value in the IEC61000-4-2 model are more stringent than the Human Body Model. The larger storage capacitor injects a higher voltage to the test point when SW2 is switched on. The lower current limiting resistor increases the current charge onto the test point. Theory of Operation I SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers 30A 15A 0A t = 0ns t t = 30ns Figure 20: ESD Test Waveform for IEC61000-4-2 1/24/20 Rev 1.0.7 11 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Mechanical Dimensions Mechanical Dimensions SSOP20 Top View Front View Side View Drawing No: POD-00000119 Revision: A Figure 21: Mechanical Dimensions, SSOP20 1/24/20 Rev 1.0.7 12 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet SSOP16 SSOP16 Top View Side View Front View Drawing No: POD-00000116 Revision: A Figure 22: Mechanical Dimensions, SSOP16 1/24/20 Rev 1.0.7 13 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet SSOP16 NSOIC16 Top View Front View Side View Drawing No: POD-00000114 Revision: A Figure 23: Mechanical Dimensions, NSOIC16 1/24/20 Rev 1.0.7 14 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet TSSOP16 TSSOP16 Top View Front View Side View POD-00000117 Drawing No: Revision: A Figure 24: Mechanical Dimensions, TSSOP16 1/24/20 Rev 1.0.7 15 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet TSSOP20 TSSOP20 Top View Side View Front View Drawing No: POD-00000120 Revision: A Figure 25: Mechanical Dimensions, TSSOP20 1/24/20 Rev 1.0.7 16 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet QFN16 5x5 QFN16 5x5 Figure 26: Mechanical Dimensions, QFN16 5x5 1/24/20 Rev 1.0.7 17 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Ordering Information Ordering Information Table 7: Ordering Information(1) Operating Temperature Range Package Packaging Method Lead-Free(2) SP3222EBEA-L/TR -40C to 85C 20 Pin SSOP Reel Yes SP3222EBEY-L/TR -40C to 85C 20 Pin TSSOP Reel Yes SP3232EBCA-L/TR 0C to 70C 16 Pin SSOP Reel Yes SP3232EBCN-L 0C to 70C 16-pin NSOIC Tube Yes SP3232EBCN-L/TR 0C to 70C 16-pin NSOIC Reel Yes SP3232EBCY-L/TR 0C to 70C 16 Pin TSSOP Reel Yes SP3232EBEA-L/TR -40C to 85C 16 Pin SSOP Reel Yes SP3232EBEN-L/TR -40C to 85C 16-pin NSOIC Reel Yes SP3232EBEY-L/TR -40C to 85C 16 Pin TSSOP Reel Yes SP3232EBER-L/TR -40C to 85C 16 Pin QFN Reel Yes Ordering Part Number SP3222EB SP3232EB 1. Refer to www.maxlinear.com/SP3222EB and www.maxlinear.com/SP3232EB for most up-to-date Ordering Information. 2. Visit www.maxlinear.com for additional information on Environmental Rating. 1/24/20 Rev 1.0.7 18 SP3222EB / SP3232EB True +3.0V to +5.5V RS-232 Transceivers Data Sheet Disclaimer MaxLinear, Inc. 5966 La Place Court, Suite 100 Carlsbad, CA 92008 760.692.0711 p. 760.444.8598 f. www.maxlinear.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. 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