SP331CT

® SP331 Programmable Dual RS-232/RS-485Transceiver FEATURES ■ +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 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 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 Now Available in Lead Free Packaging 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 APPLICATION CIRCUITS +5V 5 9 0.1µF 0.1µF +5V +5V TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS C1+ VCC 12 C111 C2+ 13 C224 SEL A 2 SEL B 400KΩ SP331 SP331 V+ V- 10 14 0.1µF 0.1µF SEL D 23 0V RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 Vcc TX2 7 T1 TX1 6 TX4 3 T3 TX3 4 RI2 16 R1 15KΩ 26 TI1 27 TI2 Vcc 400KΩ 28 TI3 1 TI4 19 RX1 20 RX2 RI1 15 RI4 18 15KΩ 21 RX3 R3 15KΩ RI3 17 15KΩ 22 RX4 8 GND SEL C 25 0V Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 1 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. VCC...........................................................................+7V Storage Temperature..........................-65˚C to +150˚C Power Dissipation 28-pin Plastic DIP...........................1000mW 28-pin Plastic SOIC.......................1000mW Package Derating: 28-pin Plastic DIP øJA....................................................40 °C/W 28-pin Plastic SOIC øJA....................................................40 °C/W ELECTRICAL CHARACTERISTICS Typically 25°C @ Vcc = +5V unless otherwise noted. MIN. TYP. MAX. LOGIC INPUTS VIL 0.8 VIH 2.0 LOGIC OUTPUTS VOL 0.4 VOH 2.4 RS-232 DRIVER DC Characteristics HIGH Level Output +5.0 +15 LOW Level Output –15.0 –5.0 Open Circuit Voltage –15 +15 Short Circuit Current ±100 Power Off Impedance 300 AC Characteristics Slew Rate Transition Time Maximum Data Rate Propagation Delay tPHL tPLH RS-232 RECEIVER DC Characteristics HIGH Threshold LOW Threshold Receiver Open Circuit Bias Input Impedance AC Characteristics Maximum Data Rate Propagation Delay tPHL tPLH RS-485 DRIVER DC Characteristics Open Circuit Voltage Differential Output 120 235 2 2 8 8 30 1.5 UNITS Volts Volts Volts Volts IOUT= -3.2mA IOUT= 1.0mA RL=3kΩ, VIN=0.8V RL=3kΩ, VIN=2.0V VOUT = 0V Vcc = 0V, Vout = ±2.0V RL=3kΩ, CL= 50pF VCC = +5.0V, TA @ +25°C RL=3kΩ, CL=2500pF ; between ±3V, TA @ +25°C RL=3kΩ, CL=2500pF Measured from 1.5V of VIN to 50% of VOUT; RL=3kΩ CONDITIONS Volts Volts Volts mA Ω V/µs µs kbps µs µs 0.8 3 120 1.7 1.2 5 235 0.25 0.25 3.0 +2.0 7 Volts Volts Volts kΩ kbps VIN = +15V to –15V 1 1 µs µs Measured from 50% of VIN to 1.5V of VOUT. 1.5 6.0 5.0 Volts Volts RL=54Ω, CL=50pF Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 2 ELECTRICAL CHARACTERISTICS Typically 25°C @ Vcc = +5V unless otherwise noted. MIN. TYP. MAX. RS-485 DRIVER Balance ±0.2 Common-Mode Output 3.0 Output Current 28.0 Short Circuit Current ±250 AC Characteristics Maximum Data Rate Output Transition Time Propagation Delay tPHL tPLH Driver Output Skew RS-485 RECEIVER DC Characteristics Inputs Common Mode Range Receiver Sensitivity Input Impedance AC Characteristics Maximum Data Rate Propagation Delay tPHL tPLH Differential Receiver Skew 10 30 80 80 10 50 120 120 20 UNITS Volts Volts mA mA Mbps ns ns ns ns CONDITIONS |VT| - |VT| RL=54Ω Terminated in –7V to +10V RL=54Ω Rise/fall time, 10%–90% See Figures 2 & 4 RDIFF=54Ω, CL1=CL2=100pF RDIFF=54Ω, CL1=CL2=100pF per Figure 4, tSKEW = | tDPLH - tDPHL| –7.0 12 10 130 130 10 ±0.2 15 +12.0 ±0.3 Volts Volts kΩ Mbps –7V ≤ VCM ≤ +12V –7V ≤ VCM ≤ +12V 200 200 20 ns ns ns See Figures 2 & 6 RDIFF=54Ω, CL1=CL2=100pF RDIFF=54Ω, CL1=CL2=100pF tSKEW = | tPLH – tPHL |; RDIFF=54Ω, CL1=CL2=100pF ENABLE TIMING RS-485 Driver Enable Time Enable to Low Enable to High Disable Time Disable From Low Disable From High 90 90 80 80 150 150 120 120 ns ns ns ns See Figures 3 & 5 CL=15pF, S1 Closed CL=15pF, S2 Closed See Figures 3 & 5 CL=15pF, S1 Closed CL=15pF, S2 Closed POWER REQUIREMENTS Supply Voltage VCC Supply Current ICC No Load (Tx Disabled) No Load (RS-232 Mode) No Load (RS-485 Mode) ENVIRONMENTAL Operating Temperature Commercial (..C..) Industrial (..E..) Storage Temperature +4.75 10 15 7 +5.25 15 30 20 Volts mA mA mA SEL_A ➨ SEL_D = "0001" SEL_A ➨ SEL_D = "0000" SEL_A ➨ SEL_D = "1100" 0 –40 –65 +70 +85 +150 °C °C °C Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 3 RECEIVER INPUT GRAPH RS-485 RECEIVER +1.0mA –7V –3V +6V +12V –0.6mA 1 Unit Load Maximum Input Current versus Voltage TEST CIRCUITS A R VOD R B Figure 1. Driver DC Test Load Circuit Figure 2. Driver/Receiver Timing Test Circuit CL1 DI A B RL CL2 A RO B 15pF VOC Output Under Test 500Ω CL S1 VCC S2 Figure 3. Driver Timing Test Load #2 Circuit Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 4 SWITCHING WAVEFORMS f ≥ 1MHz; tR ≤ 10ns; tF ≤ 10ns 1.5V 0V DRIVER OUTPUT B A tDPLH tDPHL VO 1/2VO tPLH tPHL 1/2VO 1.5V +3V DRIVER INPUT DIFFERENTIAL VO+ OUTPUT 0V VA – VB VO– tSKEW = |tDPLH - tDPHL| Figure 4. Driver Propagation Delays tR tF +3V DE 0V 5V A, B VOL VOH A, B 0V f = 1MHz; tR < 10ns; tF < 10ns 1.5V tZL 2.3V Output normally LOW 1.5V tLZ 0.5V 0.5V tHZ 2.3V tZH Output normally HIGH Figure 5. Driver Enable and Disable Times V0D2+ A–B V0D2– f = 1MHz; tR ≤ 10ns; tF ≤ 10ns 0V INPUT 0V VOH RECEIVER OUT VOL 1.5V tPHL OUTPUT tPLH 1.5V Figure 6. Receiver Propagation Delays Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 5 TTL Input Driver Output Figure 7. Typical RS-232 Driver Output Figure 8. Typical RS-485 Driver Output Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 6 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 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 SP331 Figure 9. SP331 Pinout +5V 5 VCC +5V 5 9 9 0.1µF 0.1µF 0V 0V TTL/CMOS C1+ 12 C111 C2+ 13 C224 SEL A 2 SEL B 26 TI1 SP331 Vcc V+ V- 10 14 0.1µF C1+ VCC 0.1µF 0.1µF 0.1µF 23 SEL D TX1 6 TX2 7 TX3 4 +5V 0V +5V TTL/CMOS TTL/CMOS 12 C111 C2+ 13 C224 SEL A 2 SEL B 400KΩ SP331 V+ V- 10 14 0.1µF 0.1µF SEL D 23 0V RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 Vcc 400KΩ TX2 7 T1 TX1 6 TX4 3 T3 TX3 4 RI2 16 R1 15KΩ Vcc 400KΩ T1 T2 T3 RS-232 RS-232 26 TI1 27 TI2 Vcc TTL/CMOS TTL/CMOS 27 TI2 Vcc 400KΩ 400KΩ TTL/CMOS 28 TI3 1 TI4 28 TI3 Vcc 400KΩ RS-232 TTL/CMOS TTL/CMOS 19 RX1 20 RX2 TTL/CMOS 1 TI4 T4 TX4 3 RS-232 RI1 15 RI4 18 TTL/CMOS TTL/CMOS TTL/CMOS 15KΩ TTL/CMOS 19 RX1 20 RX2 21 RX3 R1 5KΩ RI1 15 RI2 16 5KΩ 21 RX3 RS-232 RS-232 R3 15KΩ RI3 17 15KΩ 22 TTL/CMOS TTL/CMOS R2 R3 RX4 RI3 17 5KΩ 8 GND SEL C 25 0V RS-232 RS-232 TTL/CMOS 22 RX4 8 R4 5KΩ RI4 18 GND SEL C 25 0V Figure 10. Typical Operating Circuit Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 7 FUNCTION TABLE FOR SELECT PINS A 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 B 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 C 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 MODE RS-232 RS-232 RS-232 RS-232 RS-232/RS-485 RS-232/RS-485 RS-232/RS-485 RS-232/RS-485 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485 RS-485 RS-485 RS-485 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 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 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 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. 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 10V power supplies. F igure 15(a) s hows 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 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 on C1– is 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. 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 4 — VDD transfer — The fourth phase of the clock connects the negative terminal of C2 to ground and transfers the generated l0V across C2 to C4, the VDD storage capacitor. Again, Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 8 VCC = +5V +5V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor 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. 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 15kHz. The external capacitors must be 0.1µF with a 16V breakdown rating. 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. –5V –5V C3 Figure 11. Charge Pump Phase 1. VCC = +5V C4 + – + C1 + – C2 + – – VDD Storage Capacitor VSS Storage Capacitor –10V C3 Figure 12. Charge Pump Phase 2. VCC = +5V +5V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor –5V –5V C3 Figure 13. Charge Pump Phase 3. VCC = +5V +10V C1 + – C4 + – + 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 Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 9 Drivers The SP331 has four independent RS-232 singleended drivers and two differential RS-485 drivers. Control for the mode selection is done via a four–bit control word. The drivers are prearranged 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 100kΩ will suffice. When in RS-232 mode, the single-ended RS232 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 3kΩ and 2500pF applied as specified. These drivers can also operate at least 120kbps. When programmed to RS-485 mode, the differential RS-485 drivers produce complaint RS485 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 54Ω between the driver's two output pins. The signal levels and drive capability of the RS485 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. 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 output, a pull–up resistor of 100kΩ 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 5kΩ 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 15kΩ and a differential threshold of ±200mV. Since the characteristics of an RS422 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. 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. 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 tri-state and the receiver inputs are disabled. The input impedance of the receivers during loopback is approximately 15kΩ to ground. Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 10 SP331 CONTROL LOGIC CONFIGURATION (Refer to Table 1) SEL A SEL B SEL C SEL D 0 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 0 1 0 1 0 1 1 0 TX1 6 26 TI1 TX2 7 28 TI3 28 TI3 1 TI4 T4 TX4 3 TX3 4 T3 TX4 3 1 TI4 T1 1 0 0 0 1 0 0 1 1 0 1 0 1 1 0 0 1 1 0 1 1 1 1 0 26 TI1 T1 TX1 6 TX2 7 TX3 4 26 TI1 T1 TX1 6 TX2 7 26 TI1 TX1 6 T1 TX2 7 27 TI2 28 TI3 T2 T3 27 TI2 T2 T3 TX3 4 28 TI3 TX3 4 T3 TX4 3 T4 TX4 3 19 RX1 20 RX2 R1 RI1 15 19 RX1 R1 RI1 15 19 RX1 RI2 16 21 RX3 R1 RI1 15 RI2 16 19 RX1 RI1 15 R1 RI2 16 R2 21 RX3 R3 RI2 16 20 RX2 R2 RI3 17 21 RX3 RI3 17 R3 RI4 18 R3 RI3 17 21 RX3 RI3 17 R3 RI4 18 22 RX4 R4 RI4 18 22 RX4 R4 RI4 18 SP331 LOOPBACK (Refer to Table 1) SEL A SEL B SEL C SEL D 0 0 1 1 0 1 1 1 1 0 1 1 1 1 1 1 26 TI1 T1 TX1 6 TX2 7 TX3 4 26 TI1 27 TI2 T1 TX1 6 26 TI1 TX2 7 28 TI3 T1 TX1 6 TX2 7 26 TI1 TX1 6 T1 TX2 7 27 TI2 28 TI3 T2 T3 T2 28 TI3 1 TI4 T4 TX4 3 TX3 4 T3 TX4 3 1 TI4 T3 TX3 4 28 TI3 TX3 4 T3 TX4 3 T4 TX4 3 19 RX1 20 RX2 R1 RI1 15 RI2 16 RI3 17 19 RX1 20 RX2 R1 RI1 15 19 RX1 R1 RI2 16 21 RX3 RI1 15 RI2 16 19 RX1 RI1 15 R1 RI2 16 R2 R3 R2 21 RX3 21 RX3 22 RX4 R4 RI4 18 RI3 17 R3 RI4 18 22 RX4 R3 RI3 17 21 RX3 RI3 17 R3 RI4 18 R4 RI4 18 Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 11 PACKAGE: 28-PIN PLASTIC SMALL OUTLINE (SOIC) E H D A Ø e B A1 L DIMENSIONS (Inches) Minimum/Maximum (mm) A A1 B D E e H L Ø 28–PIN 0.093/0.104 (2.352/2.649) 0.004/0.012 (0.102/0.300) 0.013/0.020 (0.330/0.508) 0.698/0.706 (17.73/17.93) 0.291/0.299 (7.402/7.600) 0.050 BSC (1.270 BSC) 0.394/0.419 (10.00/10.64) 0.016/0.050 (0.406/1.270) 0°/8° (0°/8°) Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 12 ORDERING INFORMATION Model Temperature Range Package Types SP331CT ........................................................................... 0°C to +70°C ........................................................................................... 28-pin WSOIC SP331CT/TR ..................................................................... 0°C to +70°C ........................................................................................... 28-pin WSOIC SP331ET ........................................................................ -40°C to +85°C ........................................................................................... 28-pin WSOIC SP331ET/TR .................................................................. -40°C to +85°C ........................................................................................... 28-pin WSOIC Available in lead free packaging. To order add "-L" suffix to part number. Example: SP331ET/TR = standard; SP331ET-L/TR = lead free /TR = Tape and Reel Pack quantity is 1,500 for WSIOC. CLICK HERE TO ORDER SAMPLES Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 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 hereing; neither does it convey any license under its patent rights nor the rights of others. Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation 13