SP331 Programmable Dual RS-232/RS-485 Transceiver TI4 SEL_B TX4 TX3 VCC TX1 TX2 GND C1+ V+ (VDD) C2+ C1- C2- V- (VSS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SP331 * +5V Only Operation * Software Programmable RS-232 or RS-485 Selection * Four RS-232 Transceivers in RS-232 Mode * Two RS-485 Full-Duplex Transceivers in RS-485 Mode * Two RS-232 Transceivers and One RS-485 Transceiver in Dual Mode * Self-Testing Loopback Mode * Full Driver Tri-State (Hi-Z) Control * Ideal for RS-232 to RS-485 conversion 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TI3 TI2 TI1 SEL_C SEL_A SEL_D RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 DESCRIPTION The SP331 is a programmable RS-232 and/or RS-485 transceiver IC. The SP331 contains four drivers and four receivers when selected in RS-232 mode; and two drivers and two receivers when selected in RS-485 mode. The SP331 also contains a dual mode which has two RS-232 drivers/receivers plus one differential RS-485 driver/receiver. The RS-232 transceivers can typically operate at 230kbps while adhering to the RS-232 specifications. The RS-485 transceivers can operate up to 10Mbps while adhering to the RS-485 specifications. The SP331 includes a self-test loopback mode where the driver outputs are internally configured to the receiver inputs. This allows for easy diagnostic serial port testing without using an external loopback plug. The RS-232 and RS-485 drivers can be disabled (High-Z output) by controlling a set of four select pins. TYPICAL APPLICATIONS CIRCUIT +5V 9 0.1F 12 11 0.1F +5V +5V 5 VCC C1+ C1C2+ 13 TTL/CMOS SEL D Vcc 26 TI1 27 TI2 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS 1 T1 Vcc 20 22 8 23 TX4 3 T3 TX3 4 RI2 16 R1 RX2 21 RX3 14 TX1 6 TI4 19 RX1 0.1F 10 TX2 7 400K 28 TI3 V- 0.1F C224 SEL A 2 SEL B 400K TTL/CMOS V+ SP331 15K RI1 15 15K RI4 18 R3 15K RI3 17 0V RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 15K RX4 SEL C GND 25 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com 0V SP331_100_012610 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. Storage Temperature.......................-65C to +150C Power Dissipation 28-pin WSOIC...................................1000mW Package Derating: 28-pin WSOIC oJA................................................40 C/W VCC.......................................................................+7V Input Voltages Logic............................-0.5V to (Vcc+0.5V) Drivers.........................-0.5V to (Vcc+0.5V) Receivers......................+/-30V @ 100mA Driver Outputs..................................................+/-15V Maximum Data Rate..........................8Mbps (Note 1) SPECIFICATIONS Limits are specified at TA = 25C and VCC = +5.0V unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS 0.8 Volts CONDITIONS Logic Inputs VIL VIH 2.0 Volts LOGIC OUTPUTS VOL VOH 0.4 2.4 Volts IOUT = -3.2mA Volts IOUT = 1.0mA RS-232 DRIVER DC Characteristics HIGH Level Output +5.0 +15.0 Volts RL = 3k, VIN = 0.8V LOW Level Output -15.0 -5.0 Volts RL = 3k, VIN = 2.0V -15 +15 Volts +/-100 mA Open Circuit Voltage Short Circuit Current Power Off Impedance 300 VOUT = 0V VCC = 0V, VOUT = +/-2.0V AC Characteristics Slew Rate 30 V/s RL = 3k, CL = 50pF; VCC = +5.0V, TA @ 25C Transistion Time 1.5 s RL = 3k, CL = 2500pF; between +/-3V, TA @ +25C Maximum Data Rate 120 235 kbps Propagation Delay tPHL 2 8 s Propagation Delay tPLH 2 8 s 1.7 3.0 Volts RL = 3k, CL = 2500pF Measured from 1.5V of VIN to 50% of VOUT; RL = 3k RS-232 RECEIVER DC Characteristics HIGH Threshold LOW Threshold 0.8 1.2 Receiver Open Circuit Bias Input Impedance 3 Volts +2.0 Volts 7 k 5 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com VIN = +15V to -15V SP331_100_012610 SPECIFICATIONS Limits are specified at TA = 25C and VCC = +5.0V unless otherwise noted. PARAMETER MIN. TYP. 120 235 MAX. UNITS CONDITIONS RS-232 RECEIVER (continued) AC Characteristics Maximum Data Rate kbps Propagation Delay tPHL 0.25 1 s Propagation Delay tPLH 0.25 1 s 6.0 Volts Measured from 50% of VIN to 1.5V of VOUT RS-485 DRIVER DC Characteristics Open Circuit Voltage Differential Output 1.5 Balance Common-Mode Output Output Current 5.0 Volts RL = 54, CL = 50pF +/-0.2 Volts |VT| - |VT| 3.0 Volts 28.0 Short Circuit Current +/-250 mA RL = 54 mA Terminated in -7V to +10V AC Characteristics Maximum Data Rate 10 Maximum Data Rate Mbps RL = 54 8 Mbps TA = +85C, Note 1 Output Transition Time 30 50 ns Rise/Fall time, 10%-90% Propagation Delay tPHL 80 120 ns Propagation Delay tPLH 80 120 ns See Figures 2 & 4, RDIFF = 54, CL1 = CL2 = 100pF Driver Output Skew 10 20 ns Per Figure 4, tSKEW = |tPHL - tPLH| +12 Volts +/-0.3 Volts -7V VCM +12V k -7V VCM +12V RS-485 RECEIVER DC Characteristics Common Mode Range -7.0 Receiver Sensitivity Input Impedance +/-0.2 12 15 AC Characteristics Maximum Data Rate 10 Mbps Maximum Data Rate 8 Mbps TA = +85C, Note 1 Propagation Delay tPHL 130 200 ns Propagation Delay tPLH 130 200 ns See Figures 2 & 6, RDIFF = 54, CL1 = CL2 = 100pF Differential Receiver Skew 10 20 ns tSKEW = |tPHL - tPLH|, RDIFF = 54, CL1 = CL2 = 100pF Enable to LOW 90 150 ns CL = 15pF, S1 Closed Enable to HIGH 90 150 ns CL = 15pF, S2 Closed Disable from LOW 80 120 ns CL = 15pF, S1 Closed Disable from HIGH 80 120 ns CL = 15pF, S2 Closed ENABLE TIMING RS-485 DRIVER Enable Time (see Figures 3 and 5) Disable Time (see Figures 3 and 5) Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP331_100_012610 SPECIFICATIONS Limits are specified at TA = 25C and VCC = +5.0V unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS +5.25 Volts CONDITIONS POWER REQUIREMENTS Supply Voltage VCC +4.75 Supply Current ICC No Load (TX Disabled) 10 15 mA SEL_A SEL_D = "0001" No Load (RS-232 Mode) 15 30 mA SEL_A SEL_D = "0000" No Load (RS-485 Mode) 7 20 mA SEL_A SEL_D = "1100" 70 C ENVIRONMENTAL Operating Temperature Commercial (_C_) 0 Industrial (_E_) -40 +85 C Storage Temperature -65 +150 C Note 1: Exceeding the maximum data rate of 8Mbps at TA = 85C may permanently damage the device RECEIVER INPUT GRAPH RS-485 RECEIVER +1.0mA -7V -3V +6V +12V 1 Unit Load Maximum Input Current Versus Voltage -0.6mA Test Circuits A R DI VOD A B R VOC CL1 RL CL2 A B RO 15pF B Figure 1. Driver DC Test Load Circuit Output Under Test 500 S1 Figure 2. Driver/Receiver Timing Test Circuit VCC CL S2 Figure 3. Driver Timing Test Load #2 Circuit Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP331_100_012610 SWITCHING WAVEFORMS DRIVER INPUT f 1MHz; t R 10ns; t F 10ns +3V DRIVER OUTPUT 1.5V 0V B 1.5V t PLH t PHL VO 1/2VO A 1/2VO t DPLH DIFFERENTIAL VO+ OUTPUT 0V VA - VB VO- t DPHL tF tR t SKEW = |t DPLH - t DPHL| Figure 4. Driver Propagation Delays DE A, B A, B f = 1MHz; t R < 10ns; t F < 10ns +3V 1.5V 0V 1.5V t ZL 5V 2.3V VOL VOH 2.3V 0V t LZ Output normally LOW 0.5V Output normally HIGH 0.5V t ZH t HZ Figure 5. Driver Enable and Disable Times A- B f = 1MHz; t R 10ns ; t F 10ns VOD2 + 0V VOD2 - VOH RECEIVER OUT VOL 0V INPUT 1.5V 1.5V OUTPUT t PHL t PLH Figure 6. Receiver Propagation Delays Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP331_100_012610 TTL Input TTL INPUT Driver Output A Driver Output B DRIVER OUTPUT Differential Output VA - VB Figure 7. Typical RS-232 Driver Output 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SP331 TI4 SEL_B TX4 TX3 VCC TX1 TX2 GND C1+ V+ (VDD) C2+ C1- C2- V- (VSS) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 Figure 8. Typical RS-485 Driver Output TI3 TI2 TI1 SEL_C SEL_A SEL_D RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 Figure 9. SP331 Pinout Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP331_100_012610 +5V 9 0.1F 0.1F 0V 0V +5V 5 C1+ 5 VCC 12 C111 C2+ 13 C224 SEL A 2 SEL B SP331 V+ V- 10 0.1F 0.1F 14 0.1F 0.1F SEL D Vcc 23 +5V 0V +5V 9 C1+ Vcc TX1 6 T1 400K TTL/CMOS 27 TI2 Vcc TX2 7 T2 400K TTL/CMOS 28 TI3 Vcc TX3 4 T3 400K TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS 1 TI4 19 RX1 20 RX2 21 RX3 TX4 3 T4 R1 R2 RI1 15 5K RI2 16 TTL/CMOS RS-232 TTL/CMOS R3 27 TI2 TTL/CMOS RS-232 TTL/CMOS TTL/CMOS RS-232 TTL/CMOS RS-232 TTL/CMOS RS-232 TTL/CMOS 28 TI3 1 Vcc TX4 3 T3 TX3 4 RI2 16 R1 RX2 21 RX3 22 TX1 6 TI4 19 RX1 20 0.1F RX4 8 GND 23 TX2 7 T1 400K RS-232 5K RI3 17 26 TI1 0.1F 10 V- 14 SEL D 400K 26 TI1 V+ SP331 Vcc 400K TTL/CMOS VCC 12 C111 C2+ 13 C224 SEL A 2 SEL B 15K RI1 15 0V RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 15K RI4 18 R3 15K RI3 17 RS-485 RS-485 15K SEL C 25 0V RS-232 5K TTL/CMOS 22 RX4 8 GND R4 RI4 18 RS-232 5K SEL C 25 0V Figure 10. Typical Operating Circuit Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP331_100_012610 Function Table for Select Pins A 0 0 0 0 B C D 0 0 0 0 01 01 0 011 01 0 0 01 01 011 0 0111 1 1 1 1 0 0 0 0 01 01 0 011 11 0 0 11 01 111 0 1111 MODE RS-232 RS-232 RS-232 RS-232 FUNCTION All four RS-232 drivers active All four RS-232 drivers tri-state All four RS-232 drivers tri-state RS-232 (4ch) Loopback RS-232/RS-485 RS-232/RS-485 RS-232/RS-485 RS-232/RS-485 T1 and T2 active RS-232; T3 tri-state RS-485 T1 and T2 tri-state RS-232; T3 active RS-485 T1 and T2 active RS-232; T3 tri-state RS-485 RS-232 (2ch) / RS-485 (1ch) Loopback RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 T1 active RS-485; T3 and T4 active RS-232 T1 tr-state RS-485; T3 active RS-232; T4 active RS232 All RS-485 and RS-232 drivers tri-state RS-485 (1ch) / RS-232 (2ch) Loopback RS-485 RS-485 RS-485 RS-485 T1 and T3 active RS-485 T1 tri-state RS-485; T3 active RS-485 T1 active RS-485; T3 tri-state RS-485 RS-485 (2ch) Loopback Table 1. Mode Function Table. (Refer to Control Logic Confirmations for Block Diagrams) Theory of Operation The SP331 is made up of four separate circuit blocks -- the charge pump, drivers, receivers, and decoder. Each of these circuit blocks is described in more detail below. transferred to C2-. Since C2+ is connected to +5V, the voltage potential across capacitor C2 is now 10V. 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 ground, and transfers the generated -l0V to C3. Simultaneously, the positive side of capacitor C 1 is switched to +5V and the negative side is connected to ground. Charge-Pump The charge pump is a Exar-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 10V power supplies. Figure 15(a) shows the waveform found on the positive side of capcitor C2, and Figure 15(b) shows the negative side of capcitor C2. There is a free-running oscillator that controls the four phases of the voltage shifting. A description of each phase follows. Phase 3 -- VDD charge storage -- The third phase of the clock is identical to the first phase -- the charge transferred in C1 produces -5V in the negative terminal of C1, which is applied to the negative side of capacitor C2. Since C2+ is at +5V, the voltage potential across C2 is l0V. Phase 1 -- VSS charge storage --During this phase of the clock cycle, the positive side of capacitors C1 and C2 are initially charged to +5V. Cl+ is then switched to ground and charge Phase 4 -- VDD transfer -- The fourth phase of the clock connects the negative terminal of C2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP331_100_012610 to ground and transfers the generated l0V across C2 to C4, the VDD storage capacitor. Again, simultaneously with this, the positive side of capacitor C1 is switched to +5V and the negative side is connected to ground, and the cycle begins again. VCC = +5V C4 +5V C1 + + C2 - -5V - + - VDD Storage Capacitor - + VSS Storage Capacitor C3 -5V 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. Figure 11. Charge Pump Phase 1. VCC = +5V C4 C1 + C2 - + - + - VDD Storage Capacitor - + VSS Storage Capacitor The clock rate for the charge pump typically operates at 15kHz. The external capacitors must be 0.1F with a 16V breakdown rating. C3 -10V Figure 12. Charge Pump Phase 2. VCC = +5V C4 +5V C1 + C2 - -5V + - + - VDD Storage Capacitor - + VSS Storage Capacitor External Power Supplies For applications that do not require +5V only, external supplies can be applied at the V+ and V- pins. The value of the external supply voltages must be no greater than l0V. The current drain for the 10V supplies is used for RS-232. For the RS-232 driver the current requirement will be 3.5mA per driver. The external power supplies should provide a power supply sequence of :+l0V, then +5V, followed by -l0V. C3 -5V Figure 13. Charge Pump Phase 3. VCC = +5V C4 +10V C1 + - C2 + - + - VDD Storage Capacitor - + VSS Storage Capacitor C3 Figure 14. Charge Pump Phase 4. +10V a) C2+ GND GND b) C2-10V Figure 15. Charge Pump Waveforms Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com SP331_100_012610 Drivers The SP331 has four independent RS-232 single-ended drivers and two differential RS-485 drivers. Control for the mode selection is done via a four-bit control word. The drivers are pre-arranged such that for each mode of operation the relative position and functionality of the drivers are set up to accommodate the selected interface mode. As the mode of the drivers is changed, the electrical characteristics will change to support the requirements of clock, data, and control line signal levels. Unused driver inputs can be left floating; however, to ensure a desired state with no input signal, pull-up resistors to +5V or pull-down resistors to ground are suggested. Since the driver inputs are both TTL or CMOS compatible, any value resistor less than 100k will suffice. output, a pull-up resistor of 100k to +5V should be connected to the inverting input for a logic low, or the non-inverting input for a logic high. For single-ended receivers, a pull-down resistor to ground of 5k is internally connected, which will ensure a logic high output. The RS-232 receiver has a single-ended input with a threshold of 0.8V to 2.4V. The RS-232 receiver has an operating voltage range of 15V and can receive signals up to 120kbps. RS-232 receivers are used in RS-232 mode for all signal types include data, clock, and control lines of the RS-232 serial port. The differential RS-485 receiver has an input impedance of 15k and a differential threshold of 200mV. Since the characteristics of an RS-422 receiver are actually subsets of RS-485, the receivers for RS-422 requirements are identical to the RS-485 receivers. All of the differential receivers can receive data up to 10Mbps. When in RS-232 mode, the single-ended RS-232 drivers produce compliant RS-232E and ITU V.28 signals. Each of the four drivers output single-ended bipolar signals in access of 5V with a full load of 3k and 2500pF applied as specified. These drivers can also operate at least 120kbps. Select Mode Pins Similar to our SP500 family of multiprotocol products, the SP331 has the ability to change the configuration of the drivers and receivers via a 4-bit switch. Referring to Table 1; RS-232 mode, RS-485 mode, or two different combinations of RS-232/RS-485 can be configured using the SEL_A and SEL_B pins. The drivers can be put into tri-state mode by using the SEL_C and SEL_D pins. All receivers remain active during any tri-state condition of the drivers. When programmed to RS-485 mode, the differential RS-485 drivers produce complaint RS-485 signals. Each RS-485 driver outputs a unipolar signal on each output pin with a magnitude of at least 1.5V while loaded with a worst case of 54 between the driver's two output pins. The signal levels and drive capability of the RS-485 drivers allow the drivers to also comply with RS-422 levels. The transmission rate for the differential drivers is 10Mbps. Receivers The SP331 has four single-ended receivers when programmed for RS-232 mode and two differential receivers when programmed for RS-485 mode. Loopback Mode Loopback is invoked by asserting "xx11" into the select pins. In RS-232/RS-485 or RS-485/RS-232 loopback mode, the RS-232 driver outputs loop back into the RS-232 receiver inputs and the RS-485 differential driver loops back into the RS-485 receiver. During loopback, the driver outputs and receiver inputs are disconnected from the outside world. The driver outputs are in tristate and the receiver inputs are disabled. The input impedance of the receivers during loopback is approximately 15k to ground. Control for the mode selection is done via a 4-bit control word, as in the drivers. As the operating mode of the receivers is changed, the electrical characteristics will change to support the requirements of the appropriate serial standard. Unused receiver inputs can be left floating without causing oscillation. To ensure a desired state of the receiver Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com 10 SP331_100_012610 SP331 CONTROL LOGIC CONFIGURATION (Refer to Table 1) SEL A 0 0 0 0 0 0 1 1 1 1 1 1 SEL B 0 0 0 1 1 1 0 0 0 1 1 1 SEL C 0 0 1 0 0 1 0 0 1 0 0 1 SEL D 0 1 0 0 1 0 0 1 0 0 1 0 26 TI1 T1 TX1 6 TX2 7 TX3 4 26 TI1 TX1 T1 6 26 TI1 27 TI2 28 TI3 T2 T3 27 TI2 T2 TI4 T4 19 RX1 R1 20 RX2 R2 21 RX3 R3 TX4 3 RI1 15 RI2 T3 19 RX1 R1 R4 TX3 4 TX4 3 RI1 TX2 7 TX1 6 26 TI1 T1 TX3 4 T3 TX3 4 28 TI3 1 TI4 T3 TX4 3 T4 15 RI1 15 19 RX1 TX2 7 R1 TX4 3 RI1 15 19 RX1 R1 RI2 16 RI2 16 16 20 RX2 RI3 R2 RI4 RI2 16 21 RX3 R3 RI3 17 17 RI3 17 21 RX3 R3 RI3 17 21 RX3 22 RX4 7 28 TI3 28 TI3 1 TX2 TX1 6 T1 R3 18 RI4 22 RX4 18 R4 RI4 18 RI4 18 SP331 LOOPBACK (Refer to Table 1) SEL A 0 0 1 1 SEL B 0 1 0 1 SEL C 1 1 1 1 SEL D 1 1 1 1 26 TI1 27 TI2 28 TI3 1 19 TI4 RX1 20 RX2 21 RX3 TX1 6 T1 26 TX1 T1 6 26 TI1 TX2 7 T2 TX3 T3 27 TI2 28 TI3 R1 R2 R3 R4 TX2 7 TX3 4 TX4 3 28 TI3 TX4 3 T4 T2 4 RI1 15 19 RX1 T3 R1 RI1 15 T1 T3 TX1 6 TX2 7 TX3 4 TX4 3 26 TI1 28 TI3 1 TI4 19 RX1 T4 RI1 15 R1 19 TX1 6 T1 TX2 7 TX3 4 T3 RX1 RI2 16 TX4 3 RI1 15 R1 RI2 16 RI2 16 20 RX2 R2 RI2 16 21 RX3 R3 RI3 17 RI3 17 21 RX3 21 22 RX4 TI1 RI4 18 RX3 R3 RI3 17 RI4 18 22 RX4 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com 11 R4 RI3 17 R3 RI4 18 RI4 18 SP331_100_012610 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com 12 SP331_100_012610 ORDERING INFORMATION Model Temperature Range Package Types SP331CT-L........................................................................... 0C to +70C..............................................................................................28-pin WSOIC SP331CT-L/TR..................................................................... 0C to +70C..............................................................................................28-pin WSOIC SP331ET-L....................................................................... -40C to +85C.............................................................................................28-pin WSOIC SP331ET-L/TR................................................................. -40C to +85C.............................................................................................28-pin WSOIC Note: /TR = Tape and Reel revision history DATE REVISION 01-04-05 - 01/26/10 1.0.0 DESCRIPTION Legacy Sipex Datasheet Convert to Exar Format. Add Revision History table. Change revision to 1.0.0. Add Note 1 and change maximum RS-485 data rate at +85C. Update ABS Max Rating table. Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2010 EXAR Corporation Datasheet January 2010 Send your Interface technical inquiry with technical details to: uarttechsupport@exar.com Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Exar Corporation 48720 Kato Road, Fremont CA, 94538 * 510-668-7017 * www.exar.com 13 SP331_100_012610