(R) SP3223B/3243B Intelligent +3.0V to +5.5V RS-232 Transceivers Meets true EIA/TIA-232-F Standards from a +3.0V to +5.5V power supply Interoperable with EIA/TIA-232 and adheres to EIA/TIA-562 down to a +2.7V power source AUTO ON-LINE(R) circuitry automatically wakes up from a 1A shutdown Minimum 250kbps data rate under load Regulated Charge Pump Yields Stable RS-232 Outputs Regardless of VCC Variations ESD Specifications: +2kV Human Body Model DESCRIPTION The SP3223B and SP3243B products are RS-232 transceiver solutions intended for portable or hand-held applications such as notebook and palmtop computers. The SP3223B and SP3243B use an internal high-efficiency, charge-pump power supply that requires only 0.1F capacitors in 3.3V operation. This charge pump and Sipex's driver architecture allow the SP3223B/3243B series to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V. The SP3223B is a 2-driver/2-receiver device, and the SP3243B is a 3-driver/5-receiver device ideal for laptop/notebook computer and PDA applications. The SP3243B includes one complementary receiver that remains alert to monitor an external device's Ring Indicate signal while the device is shutdown. The AUTO ON-LINE(R) feature allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down drawing less than 1A. SELECTION TABLE Device Power Supplies RS-232 Drivers RS-232 Receivers External Components AUTO ON-LINE(R) Circuitry TTL 3-State No. of Pins SP3223B +3.0V to +5.5V 2 2 4 capacitors YES YES 20 SP3243B +3.0V to +5.5V 3 5 4 capacitors YES YES 28 Applicable U.S. Patents - 5,306,954; and other patents pending. Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 1 (c) Copyright 2003 Sipex Corporation ABSOLUTE MAXIMUM RATINGS 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. VCC ...................................................... -0.3V to +6.0V V+ (NOTE 1) ...................................... -0.3V to +7.0V V- (NOTE 1) ....................................... +0.3V to -7.0V V+ + |V-| (NOTE 1) ........................................... +13V ICC (DC VCC or GND current) ......................... +100mA Input Voltages TxIN, ONLINE, SHUTDOWN, EN (SP3223BE) .......... -0.3V to +6.0V RxIN .................................................................. +25V Output Voltages TxOUT ........................................................... +13.2V RxOUT, STATUS ..................... -0.3V to (VCC + 0.3V) Short-Circuit Duration TxOUT .................................................... Continuous Storage Temperature ...................... -65C to +150C Power Dissipation per package 28-pin PDIP (derate 16.0mW/C above+70C) ...................... 1300mW 20-pin SSOP (derate 9.25mW/C above +70C) ...................... 750mW 20-pin TSSOP (derate 11.1mW/C above +70C) ....................... 900mW 28-pin SOIC (derate 12.7mW/C above +70C) .................... 1000mW 28-pin SSOP (derate 11.2mW/C above +70C) ...................... 900mW 28-pin TSSOP (derate 11.1mW/C above +70C) ....................... 900mW 32-pin MLPQ NOTE 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. SPSCIFICATIONS Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX, C1 - 4 = 0.1F. Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25C. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS DC CHARACTERISTICS Supply Current, AUTO ON-LINE(R) 1.0 10 A All RxIN open, ONLINE = GND, SHUTDOWN = VCC, TxIN = VCC or GND,VCC = +3.3V, TAMB = +25C Supply Current, Shutdown 1.0 10 A SHUTDOWN = GND, VCC = +3.3V, TAMB = +25C, TxIN = VCC or GND Supply Current, AUTO ON-LINE(R) Disabled 0.3 1.0 mA ONLINE = SHUTDOWN = VCC, TxIN = VCC or GND, no load, VCC = +3.3V, TAMB = +25C 0.8 V V VCC = +3.3V or +5.0V, TxIN, EN (SP3223B), ONLINE, SHUTDOWN LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold LOW HIGH 2.4 Input Leakage Current SHUTDOWN, 0.01 1.0 A TxIN, EN (SP3223B), ONLINE, Output Leakage Current 0.05 10 A Receivers disabled, VOUT = 0V to VCC 0.4 TAMB = +25C, VIN = 0V to VCC Output Voltage LOW V IOUT = 1.6mA VCC - 0.6 VCC - 0.1 V IOUT = -1.0mA Output Voltage Swing 5.0 5.4 V All driver outputs loaded with 3K to GND, TAMB = +25C Output Resistance 300 VCC = V+ = V- = 0V, VOUT = 2V Output Voltage HIGH DRIVER OUTPUTS Output Short-Circuit Current 35 Output Leakage Current Rev. 6/30/03 60 mA VOUT = 0V 25 A VCC = 0V or 3.0V to 5.5V, VOUT = 12V, Drivers disabled SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 2 (c) Copyright 2003 Sipex Corporation SPECIFICATIONS (continued) Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX, C1 - 4 = 0.1F. Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25C. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RECEIVER INPUTS Input Voltage Range -25 Input Threshold LOW 0.6 1.2 25 V V Input Threshold LOW 0.8 1.5 V VCC = 5.0V VCC = 3.3V Input Threshold HIGH 1.5 2.4 V VCC = 3.3V Input Threshold HIGH 1.8 2.4 V VCC = 5.0V 7 k Input Hysteresis Input Resistance 0.3 3 V 5 AUTO ON-LINE(R) CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = VCC) STATUS Output Voltage LOW STATUS Output Voltage HIGH 0.4 VCC - 0.6 Receiver Threshold to Drivers Enabled (tONLINE) V IOUT = 1.6mA V IOUT = -1.0mA 200 s Figure 20 Receiver Positive or Negative Threshold to STATUS HIGH (tSTSH) 0.5 s Figure 20 Receiver Positive or Negative Threshold to STATUS LOW (tSTSL) 20 s Figure 20 TIMING CHARACTERISTICS Maximum Data Rate 250 kbps RL = 3K, CL = 1000pF, one driver active Receiver Propagation Delay tPHL tPLH 0.15 0.15 s Receiver input to Receiver output, CL = 150pF Receiver Output Enable Time 200 ns Normal operation Receiver Output Disable Time 200 ns Normal operation Driver Skew 100 ns | tPHL - tPLH |, TAMB = 25C Receiver Skew 50 ns | tPHL - tPLH | Transition-Region Slew Rate Rev. 6/30/03 30 V/s VCC= 3.3V, RL = 3K, TAMB = 25C, measurements taken from -3.0V to +3.0V or +3.0V to -3.0V SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 3 (c) Copyright 2003 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 250kbps data rate, all drivers loaded with 3K, 0.1F charge pump capacitors, and TAMB = +25C. 30 4 25 TxOUT + Slew rate (V/s) Transmitter Output Voltage (VDC) 6 2 0 -2 TxOUT - -4 -6 15 10 1000 1 Transmitter at 250Kbps 1 Transmitter at 15.6Kbps All drivers loaded 3K + Load Cap 5 0 0 - Slew + Slew 20 2000 3000 4000 5000 0 500 1000 Figure 1. Transmitter Output Voltage VS. Load Capacitance for the SP3223B 3000 4000 5000 Figure 2. Slew Rate VS. Load Capacitance for the SP3223B 35 20 25 Supply Current (mA) 30 I CC (mA) 2000 Load Capacitance (pF) Load Capacitance (pF) 250Kbps 20 125Kbps 15 20Kbps 10 1 Transmitter at 250Kbps 1 Transmitter at 15.6Kbps All drivers loaded 3K + Load Cap 5 0 0 1000 2000 3000 4000 15 10 0 5000 1 Transmitter at 250Kbps 2 Transmitters at 15.6Kbps All drivers loaded with 3K // 1000pF 5 2.7 3 Load Capacitance (pF) 3.5 4 4.5 5 Supply Voltage (VDC) Figure 4. Supply Current VS. Supply Voltage for the SP3243B Figure 3. Supply Current VS. Load Capacitance when Transmitting Data for the SP3223B 6 6 4 4 2 2 Transmitter Output Voltage (V) Transmitter Output Voltage (VDC) TxOUT + 0 -2 -4 -6 TxOUT - 2.7 3 3.5 4 4.5 5 TxOUT + 0 -2 TxOUT - -4 -6 0 1000 3000 4000 5000 Figure 6. Transmitter Output Voltage VS. Load Capacitance for the SP3243B Figure 5. Transmitter Output Voltage VS. Supply Voltage for the SP3243B Rev. 6/30/03 2000 Load Capacitance (pF) Supply Voltage (VDC) SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 4 (c) Copyright 2003 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 250kbps data rate, all drivers loaded with 3K, 0.1F charge pump capacitors, and TAMB = +25C. 40 20 Supply Current (mA) Slew rate (V/s) 25 - Slew + Slew 15 10 1 Transmitter at 250Kbps 2 Transmitter at 15.6Kbps All drivers loaded 3K + Load Cap 5 0 0 500 1000 2000 3000 4000 35 30 120Kbps 250Kbps 25 20Kbps 20 15 1 Transmitter at full Data Rate 10 2 Transmitters at 15.5 Kbps 5 All Transmitters loades 3K + Load Cap 0 5000 0 1000 Load Capacitance (pF) 2000 3000 4000 5000 Load Capacitance (pF) Figure 8. Supply Current VS. Load Capacitance when Transmitting Data for the SP3243B Figure 7. Slew Rate VS. Load Capacitance for the SP3243B 25 6 20 4 Transmitter Output Voltage (V) Supply Current (mA) TxOUT + 15 10 1 Transmitter at 250Kbps 2 Transmitters at 15.6Kbps All drivers loaded with 3K // 1000pF 5 0 2.7 3 3.5 4 4.5 2 0 -2 -4 -6 5 TxOUT - 2.7 Figure 9. Supply Current VS. Supply Voltage for the SP3243B Rev. 6/30/03 3 3.5 4 4.5 5 Supply Voltage (VDC) Supply Voltage (VDC) Figure 10. Transmitter Output Voltage VS. Supply Voltage for the SP3243B SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 5 (c) Copyright 2003 Sipex Corporation NAME FUNCTION SP3223B PIN NUMBER SP3243B SOIC, SSOP, SP3243BCR TSSOP MLPQ EN 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 28 28 V+ Regulated +5.5V output generated by the charge pump. 3 27 26 C1- Negative terminal of the voltage doubler charge-pump capacitor. 4 24 22 C2+ Positive terminal of the inverting charge-pump capacitor. 5 1 29 C2- Negative terminal of the inverting charge-pump capacitor. 6 2 31 Regulated -5.5V output generated by the charge pump. 7 3 32 R1IN V- RS-232 receiver input. 16 4 2 R2IN RS-232 receiver input. 9 5 3 R3IN RS-232 receiver input. - 6 4 R4IN RS-232 receiver input. - 7 5 R5IN RS-232 receiver input. - 8 6 R1OUT TTL/CMOS receiver output. 15 19 17 R2OUT TTL/CMOS receiver output. 10 18 16 R2OUT Non-inverting receiver-2 output, active in shutdown. - 20 18 R3OUT TTL/CMOS receiver output. - 17 15 R4OUT TTL/CMOS receiver output. - 16 14 R5OUT TTL/CMOS receiver output. - 15 13 TTL/CMOS Output indicating online and shutdown status. 11 21 19 T1IN TTL/CMOS driver input. 13 14 12 T2IN TTL/CMOS driver input. 12 13 11 T3IN TTL/CMOS driver input. - 12 10 Apply logic HIGH to override Auto-Online circuitry keeping drivers active (SHUTDOWN must also be logic HIGH, refer to Table 2). 14 23 21 T1OUT RS-232 driver output. 17 9 7 T2OUT RS-232 driver output. 8 10 8 T3OUT RS-232 driver output. - 11 9 Ground. 18 25 23 +3.0V to +5.5V supply voltage. 19 26 25 20 22 20 - - 1,24,27,30 STATUS ONLINE GND VCC SHUTDOWN Apply logic LOW to shut down drivers and charge pump. This overrides all AUTO ON-LINE(R) circuitry and ONLINE (refer to Table 2). NC No Connection Table 1. Device Pin Description Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 6 (c) Copyright 2003 Sipex Corporation EN C1+ 2 28 C1+ C2- 2 27 V+ V- 3 26 VCC R1IN 4 25 GND R2IN 5 24 C1- 19 VCC V+ 3 18 GND C1- 4 17 T1OUT C2+ 5 16 R1IN C2- 6 15 R1OUT V- 7 14 T2OUT 8 13 T1IN R2IN 9 12 T2IN R2OUT 10 C2+ 1 20 SHUTDOWN 1 SP3223B 11 ONLINE R3IN 6 R4IN 7 SP3243B 22 SHUTDOWN 21 STATUS R5IN 8 STATUS 23 ONLINE T1OUT 9 20 R2OUT T2OUT 10 19 R1OUT T3OUT 11 18 R2OUT T3IN 12 17 R3OUT T2IN 13 16 R4OUT T1IN 14 15 R5OUT Figure 12. SP3243B Pinout Configuration 25 26 27 28 29 30 1 24 2 23 (R) 3 22 4 21 5 20 SP3243B 6 19 16 15 14 13 NC GND C1ONLINE SHUTDOWN STATUS R2OUT R1OUT T3OUT T3IN T2IN T1IN R5OUT R4OUT R3OUT R2OUT 12 17 11 18 8 10 7 9 NC R1IN R2IN R3IN R4IN R5IN T1OUT T2OUT 31 32 VC2NC C2+ C1+ NC V+ VCC Figure 11. SP3223B Pinout Configuration Figure 13. SP3243B MLPQ Pinout Configuration Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 7 (c) Copyright 2003 Sipex Corporation +3.3V to +5V + C5 C1 + 19 0.1F VCC 2 C1+ V+ 3 0.1F C3 + 0.1F 4 C15 C2+ C2 + 0.1F TTL/CMOS INPUTS SP3223B V- 7 C4 6 C213 T1IN T1OUT 12 T2IN T2OUT R1IN 15 R1OUT RS-232 OUTPUTS 8 16 RS-232 INPUTS R2IN 10 R2OUT 0.1F 17 5k TTL/CMOS OUTPUTS + 9 5k VCC 1 EN 20 14 To P Supervisor Circuit 11 SHUTDOWN ONLINE STATUS GND 18 Figure 14. SP3223B Typical Operating Circuit Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 8 (c) Copyright 2003 Sipex Corporation VCC C5 C1 + + 26 VCC 0.1F 28 C1+ V+ 27 0.1F + C3 0.1F 24 C11 C2+ C2 + 0.1F TTL/CMOS INPUTS V- 3 SP3243B C4 2 C214 T1IN T1OUT 9 13 T2IN T2OUT 10 12 T3IN T3OUT 11 + 0.1F RS-232 OUTPUTS 20 R2OUT 19 R1OUT R1IN 4 R2IN 5 R3IN 6 R4IN 7 R5IN 8 5k 18 R2OUT 5k TTL/CMOS OUTPUTS 17 R3OUT 5k 16 R4OUT RS-232 INPUTS 5k 15 R5OUT VCC 22 23 To P Supervisor Circuit 5k SHUTDOWN ONLINE 21 STATUS GND 25 Figure 15. SP3243B Typical Operating Circuit Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 9 (c) Copyright 2003 Sipex Corporation DESCRIPTION The SP3223B and SP3243B 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 SP3223B and SP3243B devices feature Sipex's proprietary and patented (U.S.-5,306,954) on-board charge pump circuitry that generates 5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. The SP3223B and SP3243B devices can operate at a data rate of 250kbps fully loaded. The SP3223B and SP3243B series is an ideal choice for power sensitive designs. The SP3223B and SP3243B devices feature AUTO ON-LINE(R) circuitry which reduces the power supply drain to a 1A supply current. In many portable or hand-held applications, an RS-232 cable can be disconnected or a connected peripheral can be turned off. Under these conditions, the internal charge pump and the drivers will be shut down. Otherwise, the system automatically comes online. This feature allows design engineers to address power saving concerns without major design changes. The SP3223B is a 2-driver/2-receiver device, and the SP3243B is a 3-driver/5-receiver device ideal for portable or hand-held applications. The SP3243B includes one complementary always-active receiver that can monitor an external device (such as a modem) in shutdown. This aids in protecting the UART or serial controller IC by preventing forward biasing of the protection diodes where VCC may be disconnected. THEORY OF OPERATION The SP3223B and SP3243B series is made up of four basic circuit blocks: 1. Drivers, 2. Receivers, 3. the Sipex proprietary charge pump, and 4. AUTO ON-LINE(R) circuitry. Drivers 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. These drivers comply with the EIA-TIA-232F and all previous RS-232 versions. Unused driver inputs should be connected to GND or VCC. VCC + C5 + C1 26 VCC 0.1F 28 C1+ V+ 27 0.1F C3 + 0.1F 24 C11 C2+ C2 + 0.1F SP3243B V- 3 C4 2 C214 T1IN T1OUT RTS 13 T2IN T2OUT 10 DTR 12 T3IN T3OUT 11 RxD 19 R1OUT CTS 18 R2OUT DSR 17 R3OUT DCD 16 R4OUT TxD + 0.1F 9 RS-232 OUTPUTS 20 R2OUT UART or Serial C R1IN 4 5K R2IN 5 5K R3IN 6 R4IN 7 R5IN 8 5K RS-232 INPUTS 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. 5K 15 R5OUT RI VCC 22 23 5K SHUTDOWN ONLINE 21 STATUS GND 25 RESET P Supervisor IC VIN The slew rate of the driver output 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 meets the monotonicity requirements of the standard. Figure 16. Interface Circuitry Controlled by Microprocessor Supervisory Circuit Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 10 (c) Copyright 2003 Sipex Corporation +3V to +5V DEVICE: SP3223B + C5 SHUTDOWN EN TXOUT RXOUT C1 0 0 High Z Active 0 1 High Z High Z 1 0 Active Active 1 1 Active High Z + 0.1F VCC C1+ V+ 0.1F C3 C2+ C2 + 0.1F SP3223B SP3243B C4 T1IN T1OUT TXIN TXOUT DEVICE: SP3243B RXOUT R2OUT 0 High Z High Z Active 1 Active Active Active 0.1F R1IN 5k RXIN RXOUT 5k VCC 1000pF EN 1000pF SHUTDOWN ONLINE To P Supervisor Circuit STATUS GND 18 Table 2. SHUTDOWN and EN Truth Tables Note: In AUTO ON-LINE(R) Mode where ONLINE = GND and SHUTDOWN = VCC, the device will shut down if there is no activity present at the Receiver inputs. Figure 17. Loopback Test Circuit for RS-232 Driver Data Transmission Rates was active at 250kbps and all three drivers loaded with an RS-232 receiver in parallel with a 1000pF capacitor. A solid RS-232 data transmission rate of 250kbps provides compatibility with many designs in personal computer peripherals and LAN applications. The SP3223B and SP3243B drivers can maintain high data rates up to 250kbps fully loaded. Figure 17. shows a loopback test circuit used to test the SP3243B RS-232 Drivers. Figure 18 shows the test results of the loopback circuit with all three drivers active at 120kbps with typical RS-232 loads in parallel with 1000pF capacitors. Figure 19 shows the test results where one driver Receivers The receivers convert 5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. All receivers have an inverting output that can be disabled by using the EN pin. Figure 18. Loopback Test Circuit All Drivers at 120kbps Rev. 6/30/03 + TTL/CMOS INPUTS R1OUT TXOUT 0.1F V- C2- TTL/CMOS OUTPUTS SHUTDOWN + C1- Figure 19. Loopback Test Circuit One Driver at 250kbps SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 11 (c) Copyright 2003 Sipex Corporation 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. Receivers are active when the AUTO ON-LINE(R) circuitry is enabled or when in shutdown. During the shutdown, the receivers will continue to be active. If there is no activity present at the receivers for a period longer than 100s or when SHUTDOWN is enabled, the device goes into a standby mode where the circuit draws 1A. Driving EN to a logic HIGH forces the outputs of the receivers into high-impedance. The truth table logic of the SP3223B and SP3243B driver and receiver outputs can be found in Table 2. 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. The SP3243B includes an additional non-inverting receiver with an output R2OUT. R2OUT is an extra output that remains active and monitors activity while the other receiver outputs are forced into high impedance. This allows Ring Indicator (RI) from a peripheral to be monitored without forward biasing the TTL/CMOS inputs of the other devices connected to the receiver outputs. Phase 2 -- VSS transfer -- 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 C 3. 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. 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. 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 capacitor C2. Since C2+ is at VCC, the voltage potential across C2 is 2 times VCC. Charge Pump The charge pump is a Sipex-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 5.5V regardless of the input voltage (VCC) over the +3.0V to +5.5V range. This is important to maintain compliant RS-232 levels regardless of power supply fluctuations. Rev. 6/30/03 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. SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 12 (c) Copyright 2003 Sipex Corporation 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. The clock rate for the charge pump typically operates at 250kHz. The external capacitors can be as low as 0.1F with a 16V breakdown voltage rating. S H U T RECEIVER +2.7V 0V RS-232 INPUT VOLTAGES -2.7V D O W N VCC STATUS 0V tSTSL tSTSH tONLINE +5V DRIVER RS-232 OUTPUT VOLTAGES 0V -5V Figure 20. AUTO ON-LINE(R) Timing Waveforms Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 13 (c) Copyright 2003 Sipex Corporation VCC = +5V C4 +5V C1 + C2 - -5V + - - + VDD Storage Capacitor + - VSS Storage Capacitor C3 -5V Figure 21. Charge Pump -- Phase 1 VCC = +5V C4 C1 + C2 - + - - + + - VDD Storage Capacitor VSS Storage Capacitor C3 -10V Figure 22. Charge Pump -- Phase 2 [ T ] +6V a) C2+ T 1 0V 2 2 0V b) C2T -6V Ch1 2.00V Ch2 2.00V M 1.00s Ch1 1.96V Figure 23. Charge Pump Waveforms VCC = +5V C4 +5V + C1 + C2 - -5V - + - - + VDD Storage Capacitor VSS Storage Capacitor C3 -5V Figure 24. Charge Pump -- Phase 3 VCC = +5V +10V C1 + - C2 C4 + - - + + - VDD Storage Capacitor VSS Storage Capacitor C3 Figure 25. Charge Pump -- Phase 4 Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 14 (c) Copyright 2003 Sipex Corporation 4 -2 8.6 3.46 2.67 1.82 1.57 1.38 1.23 1.12 1.02 0.939 0.62 0 4.93 Vout+ Vout- 2 0.869 Transmitter Output Voltage [V] 6 -4 -6 Load Current Per Transmitter [mA] Figure 26. SP3243B Driver Output Voltages vs. Load Current per Transmitter C5 C1 + + VCC 26 0.1F VCC 28 C1+ V+ 27 0.1F C3 + 0.1F 24 C1- SP3243B 1 C2+ C2 + 0.1F V- 3 C4 2 C214 T1IN T1OUT 9 13 T2IN T2OUT 10 12 T3IN T3OUT 11 + 0.1F 20 R2OUT 19 R1OUT R1IN 4 R2IN 5 R3IN 6 R4IN 7 R5IN 8 5k 18 R2OUT 5k 17 R3OUT 5k 16 R4OUT 5k 15 R5OUT VCC 22 23 To P Supervisor Circuit 5k DB-9 Connector SHUTDOWN ONLINE 21 STATUS 6 7 8 9 GND 25 DB-9 Connector Pins: 1. Received Line Signal Detector 2. Received Data 3. Transmitted Data 4. Data Terminal Ready 5. Signal Ground (Common) 6. 7. 8. 9. 1 2 3 4 5 DCE Ready Request to Send Clear to Send Ring Indicator Figure 27. Circuit for the connectivity of the SP3243B with a DB-9 connector Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 15 (c) Copyright 2003 Sipex Corporation RS - 232 SIGNAL AT RECEIVER INPUT SHUTDOWN INPUT ONLINE INPUT STATUS OUTPUT TRANCEIVER STATUS YES HIGH LOW HIGH Normal Operation (AUTO ON-LINE(R)) NO HIGH HIGH LOW Normal Operation NO HIGH LOW LOW Sutdown (AUTO ON-LINE(R) ) YES LOW HIGH/LOW HIGH Shutdown NO LOW HIGH/LOW LOW Shutdown Table 3. AUTO ON-LINE(R) Logic RXINACT Inactive Detection Block RS-232 Receiver Block RXIN RXOUT Figure 28. Stage I of AUTO ON-LINE(R) Circuitry Delay Stage Delay Stage Delay Stage Delay Stage Delay Stage STATUS R1INACT R2INACT R4INACT R3INACT R5INACT SHUTDOWN Figure 29. Stage II of AUTO ON-LINE(R) Circuitry Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 16 (c) Copyright 2003 Sipex Corporation receiver's RXINACT signals with an accumulated delay that disables the device to a 1A supply current. The STATUS pin goes to a logic LOW when the cable is disconnected, the external transmitters are disabled, or the SHUTDOWN pin is invoked. The typical accumulated delay is around 20s. AUTO ON-LINE(R) Circuitry The SP3223B and SP3243B devices have a patent pending AUTO ON-LINE(R) circuitry on board that saves power in applications such as laptop computers, palmtop (PDA) computers, and other portable systems. The SP3223B and SP3243B devices incorporate an AUTO ON-LINE(R) circuit that automatically enables itself when the external transmitters are enabled and the cable is connected. Conversely, the AUTO ON-LINE(R) circuit also disables most of the internal circuitry when the device is not being used and goes into a standby mode where the device typically draws 1A. This function can also be externally controlled by the ONLINE pin. When this pin is tied to a logic LOW, the AUTO ON-LINE(R) function is active. Once active, the device is enabled until there is no activity on the receiver inputs. The receiver input typically sees at least 3V, which are generated from the transmitters at the other end of the cable with a 5V minimum. When the external transmitters are disabled or the cable is disconnected, the receiver inputs will be pulled down by their internal 5k resistors to ground. When this occurs over a period of time, the internal transmitters will be disabled and the device goes into a shutdown or standby mode. When ONLINE is HIGH, the AUTO ON-LINE(R) mode is disabled. When the SP3223B and SP3243B drivers or internal charge pump are disabled, the supply current is reduced to 1A. This can commonly occur in hand-held or portable applications where the RS-232 cable is disconnected or the RS-232 drivers of the connected peripheral are turned off. The AUTO ON-LINE(R) mode can be disabled by the SHUTDOWN pin. If this pin is a logic LOW, the AUTO ON-LINE(R) function will not operate regardless of the logic state of the ONLINE pin. Table 3 summarizes the logic of the AUTO ONLINE(R) operating modes. The truth table logic of the SP3223B and SP3243B driver and receiver outputs can be found in Table 2. The STATUS pin outputs a logic LOW signal if the device is shutdown. This pin goes to a logic HIGH when the external transmitters are enabled and the cable is connected. When the SP3223B and SP3243B devices are shut down, the charge pumps are turned off. V+ charge pump output decays to VCC, the V- output decays to GND. The decay time will depend on the size of capacitors used for the charge pump. Once in shutdown, the time required to exit the shut down state and have valid V+ and V- levels is typically 200s. The AUTO ON-LINE(R) circuit has two stages: 1) Inactive Detection 2) Accumulated Delay The first stage, shown in Figure 28, detects an inactive input. A logic HIGH is asserted on RXINACT if the cable is disconnected or the external transmitters are disabled. Otherwise, RXINACT will be at a logic LOW. This circuit is duplicated for each of the other receivers. For easy programming, the STATUS can be used to indicate DTR or a Ring Indicator signal. Tying ONLINE and SHUTDOWN together will bypass the AUTO ON-LINE(R) circuitry so this connection acts like a shutdown input pin. The second stage of the AUTO ON-LINE(R) circuitry, shown in Figure 29, processes all the Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 17 (c) Copyright 2003 Sipex Corporation ESD TOLERANCE The SP3223B/3243B 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 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 electrostatic energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 30. This method will test the IC's capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5k and 100pF, respectively. RSS RC C SW2 SW1 CSS DC Power Source Device Under Test Figure 30. ESD Test Circuit for Human Body Model Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 18 (c) Copyright 2003 Sipex Corporation PACKAGE: PLASTIC DUAL-IN-LINE (NARROW) E1 E D1 = 0.005" min. (0.127 min.) A1 = 0.015" min. (0.381min.) D A = 0.210" max. (5.334 max). C A2 B1 B e = 0.100 BSC (2.540 BSC) O L eA = 0.300 BSC (7.620 BSC) ALTERNATE END PINS (BOTH ENDS) DIMENSIONS (Inches) Minimum/Maximum (mm) 16-PIN 20-PIN 28-PIN A2 0.115/0.195 (2.921/4.953) 0.115/0.195 (2.921/4.953) 0.115/0.195 (2.921/4.953) B 0.014/0.022 (0.356/0.559) 0.014/0.022 (0.356/0.559) 0.014/0.022 (0.356/0.559) B1 0.045/0.070 (1.143/1.778) 0.045/0.070 (1.143/1.778) 0.045/0.070 (1.143/1.778) C 0.008/0.014 (0.203/0.356) 0.008/0.014 (0.203/0.356) 0.008/0.014 (0.203/0.356) 1.385/1.454 0.780/0.800 0.980/1.060 (19.812/20.320) (24.892/26.924) (35.17/36.90) D Rev. 6/30/03 E 0.300/0.325 (7.620/8.255) 0.300/0.325 (7.620/8.255) 0.300/0.325 (7.620/8.255) E1 0.240/0.280 (6.096/7.112) 0.240/0.280 (6.096/7.112) 0.240/0.280 (6.096/7.112) L 0.115/0.150 (2.921/3.810) 0.115/0.150 (2.921/3.810) 0.115/0.150 (2.921/3.810) O 0/ 15 (0/15) 0/ 15 (0/15) 0/ 15 (0/15) SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 19 (c) Copyright 2003 Sipex Corporation PACKAGE: PLASTIC SHRINK SMALL OUTLINE (SSOP) E H D A O e A1 B L DIMENSIONS (Inches) Minimum/Maximum (mm) Rev. 6/30/03 16-PIN 20-PIN 24-PIN 28-PIN A 0.068/0.078 (1.73/1.99) 0.068/0.078 (1.73/1.99) 0.068/0.078 (1.73/1.99) 0.068/0.078 (1.73/1.99) A1 0.002/0.008 (0.05/0.21) 0.002/0.008 (0.05/0.21) 0.002/0.008 (0.05/0.21) 0.002/0.008 (0.05/0.21) B 0.010/0.015 (0.25/0.38) 0.010/0.015 (0.25/0.38) 0.010/0.015 (0.25/0.38) 0.010/0.015 (0.25/0.38) D 0.239/0.249 (6.07/6.33) 0.278/0.289 (7.07/7.33) 0.317/0.328 (8.07/8.33) 0.397/0.407 (10.07/10.33) E 0.205/0.212 (5.20/5.38) 0.205/0.212 (5.20/5.38) 0.205/0.212 (5.20/5.38) 0.205/0.212 (5.20/5.38) e 0.0256 BSC (0.65 BSC) 0.0256 BSC (0.65 BSC) 0.0256 BSC (0.65 BSC) 0.0256 BSC (0.65 BSC) H 0.301/0.311 (7.65/7.90) 0.301/0.311 (7.65/7.90) 0.301/0.311 (7.65/7.90) 0.301/0.311 (7.65/7.90) L 0.022/0.037 (0.55/0.95) 0.022/0.037 (0.55/0.95) 0.022/0.037 (0.55/0.95) 0.022/0.037 (0.55/0.95) O 0/8 (0/8) 0/8 (0/8) 0/8 (0/8) 0/8 (0/8) SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 20 (c) Copyright 2003 Sipex Corporation PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (WIDE) E H D A O e B A1 L DIMENSIONS (Inches) Minimum/Maximum (mm) Rev. 6/30/03 28-PIN A 0.090/0.104 (2.29/2.649) A1 0.004/0.012 (0.102/0.300) B 0.013/0.020 (0.330/0.508) D 0.697/0.713 (17.70/18.09) E 0.291/0.299 (7.402/7.600) e 0.050 BSC (1.270 BSC) H 0.394/0.419 (10.00/10.64) L 0.016/0.050 (0.406/1.270) O 0/8 (0/8) SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 21 (c) Copyright 2003 Sipex Corporation PACKAGE: PLASTIC THIN SMALL OUTLINE (TSSOP) DIMENSIONS in inches (mm) Minimum/Maximum Symbol D e 20 Lead 28 Lead 0.252/0.260 0.378/0.386 (6.40/6.60) (9.60/9.80) 0.026 BSC (0.65 BSC) 0.026 BSC (0.65 BSC) e 0.126 BSC (3.2 BSC) 0.252 BSC (6.4 BSC) 1.0 OIA 0.169 (4.30) 0.177 (4.50) 0.039 (1.0) 0'-8' 12'REF e/2 0.039 (1.0) 0.043 (1.10) Max D 0.033 (0.85) 0.037 (0.95) 0.007 (0.19) 0.012 (0.30) 0.002 (0.05) 0.006 (0.15) (2) 0.008 (0.20) 0.004 (0.09) Min 0.004 (0.09) Min Gage Plane 0.010 (0.25) (3) 0.020 (0.50) 0.026 (0.75) (1) 1.0 REF Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 22 (c) Copyright 2003 Sipex Corporation PACKAGE: MLPQ D D/2 Index Area D2 (0.132/0.140) (3.35/3.55) E (0.197) (5.00 BSC) E2 (0.132/0.140) (3.35/3.55) e (0.020) (0.50 BSC) L (0.012/0.020) (0.30/0.50) N (1.260) (32) ND (0.315) (8) NE (0.315) (8) TOP VIEW Seating Plane SIDE VIEW D2 D2/2 E2 (0.197) (5.00 BSC) E2/2 D A3 (0.007/0.012) (0.18/0.30) A b A1 (0.032/0.039) (0.80/1.00) NXL A E 32-PIN (NE - 1) x e DIMENSIONS (Inches) Minimum/Maximum (mm) E/2 (D/2 x E/2) Exposed pad NXb (ND - 1) x e BOTTOM VIEW Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 23 (c) Copyright 2003 Sipex Corporation ORDERING INFORMATION Model Temperature Range Package Types SP3223BCP ...................................................... 0C to +70C -------------------------------------------- 20-pin PDIP SP3223BCA ...................................................... 0C to +70C ------------------------------------------- 20-pin SSOP SP3223BCY ...................................................... 0C to +70C ----------------------------------------- 20-pin TSSOP SP3223BEP ..................................................... -40C to +85C ------------------------------------------- 20-pin PDIP SP3223BEA ..................................................... -40C to +85C ------------------------------------------ 20-pin SSOP SP3223BEY ..................................................... -40C to +85C ---------------------------------------- 20-pin TSSOP SP3243BCT ....................................................... 0C to +70C ------------------------------------ 28-pin Wide SOIC SP3243BCA ...................................................... 0C to +70C ------------------------------------------- 28-pin SSOP SP3243BCY ..................................................... -0C to +70C ----------------------------------------- 28-pin TSSOP SP3243BCR ..................................................... -0C to +70C ------------------------------------------ 32-pin MLPQ SP3243BET ..................................................... -40C to +85C ----------------------------------- 28-pin Wide SOIC SP3243BEA ..................................................... -40C to +85C ------------------------------------------ 28-pin SSOP SP3243BEY ..................................................... -40C to +85C ---------------------------------------- 28-pin TSSOP Please consult the factory for pricing and availability on a Tape-On-Reel option. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Rev. 6/30/03 SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers 24 (c) Copyright 2003 Sipex Corporation