SP332CT

SP332 SIPEX | Alldatasheet

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TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation SP332 RS-232/RS-485 Multi-Mode Serial Transceiver RS-232 Mode Full Duplex RS-485 n +5V-Only Single Supply Operation n 4 Drivers, 4 Receivers RS-232 n 2 Drivers, 2 Receivers RS-485 n Loop Back Function for Self Test n 28 Pin SOIC Packaging DESCRIPTION… The SP332 is a monolithic device that contains both RS-232 and RS-485 line drivers and receivers. The configuration of the SP332 can be changed at any time by changing the logic state of two control input pins. The device also includes a loop back function which internally connects driver outputs to receiver inputs for a chip self test. A Sipex-patented charge pump (5,306,954) allows +5V-only operation. SEL A TTL/CMOS TTL/CMOS TTL/CMOS 0.1mF 0.1mF C1+ C1- C2+ C2- SEL B2 +5V VCC GND8 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 TTL/CMOS 0.1mF 0.1mF TTL/CMOSSHUT DOWN RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RI1 RI2 TX3 TX4 TX1 TX2 TI1 TI2 TI3 TI4 RX1 RX2 TTL/CMOS 21 R3 18RI4 RI3 RX3 RX4 Vcc Vcc LOOP BACK RS-485/RS-232 RS-485/RS-232 +5V +5VTTL/CMOS TTL/CMOS +5V GND TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS 0.1mF 0.1mF VCC TTL/CMOSSHUT DOWN RS-232 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TX1 TX2 TX3 TX4 TI1 TI2 TI3 TI4 RI1 RI2 RI3 RI4 RX1 RX2 RX3 RX4 1 3 100.1mF 0.1mF C1+ C1- C2+ C2- SEL B2 SEL A24 5KW 5KW 5KW 5KW 400KW Vcc 400KW Vcc 400KW Vcc 400KW Vcc RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 LOOP BACK SP332 SP332

TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation SPECIFICATIONS TMIN to TMAX and VCC = 5V±5% unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RS-485 DRIVER DC Characteristics Differential Output Voltage GND V CC Volts Unloaded; R= ∞ ; see figure 1 Differential Output Voltage 2.0 5.0 Volts With Load; R=50 Ω (RS-422); see figure 1 Differential Output Voltage 1.5 5.0 Volts With Load; R=27 Ω (RS-485); see figure 1 Change in Magnitude of Driver Differential Output Voltage for Complementary States 0.2 Volts R=27 Ω or R=50Ω ; see figure 1 Driver Common-Mode Output Voltage 3 Volts R=27 Ω or R=50Ω ; see figure 1 Input High Voltage 2.0 Volts Applies to transmitter inputs, SEL A, SEL B, SD, LB Input Low Voltage 0.8 Volts Applies to SEL A, SEL B, SD, LB Input Current ±10 µA Applies to: Pull-Up Current 1.5 µA transmitter inputs, LB Pull-Down Current 3.0 µA SEL A, SEL B, SD, Driver Short-Circuit Current V OUT = HIGH 35 250 mA -7V ≤VO ≤10V VOUT = LOW 35 250 mA -7V ≤VO ≤10V AC Characteristics Driver Data Rate 10 Mbps Driver Input to Output 70 180 ns R DIFF=54Ω , CL1=C L2=100pF; tPLH see figures 3 and 6 Driver Input to Output 70 180 ns R DIFF=54Ω , CL1=C L2=100pF; tPHL see figures 3 and 6 Driver Skew 5 10 ns From output to output; see figures 3 and 6 Driver Rise or Fall Time 3 15 40 ns From 10% to 90%; R DIFF=54Ω , C L1=C L2=100pF; see figures 3 and 6 RS-485 RECEIVER DC Characteristics Differential Input Threshold -0.2 +0.2 Volts -7V ≤V CM ≤12V Input Hysteresis 70 mV V CM =0V Output Voltage High 3.5 Volts I O =-4mA, VID=+200mV Output Voltage Low 0.4 Volts I O =+4mA, VID=-200mV Input Resistance 12 15 k Ω -7V≤VCM ≤12V Input Current (A, B); VIN= 12V +1.5 mA V IN= 12V, A is the non-inverting receiver input. B is the inverting receiver input Input Current (A, B); V IN= -7V -0.8 mA V IN= -7V Short Circuit Current 85 mA 0V ≤VCM ≤VCC 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. V Input Voltages

TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation SPECIFICATIONS (CONTINUED) TMIN to TMAX and VCC = 5V±5% unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS AC Characteristics Receiver Data Rate 10 Mbps Receiver Input to Output 130 250 ns R DIFF=54Ω , CL1=C L2=100pF; tPLH Figures 3 and 8 Receiver Input to Output 130 250 ns R DIFF=54Ω , CL1=C L2=100pF; tPHL Figures 3 and 7 Diff. Receiver Skew |tPLH -tPHL |1 3 n s R DIFF=54Ω , CL1=C L2=100pF; Figures 3 and 7 RS-232 DRIVER DC Characteristics TTL Input Levels V IL 0.8 Volts Applies to transmitter inputs, SEL A, SEL B, SD, LB VIH 2.0 Volts Applies to transmitter inputs, SEL A, SEL B, SD, LB Voltage Outputs High Level Output +5.0 +15.0 Volts R L=3kΩ to Gnd Low Level Output -15.0 -5.0 Volts R L=3kΩ to Gnd Open Circuit Output ±15 Volts R L=∞ Short Circuit Current ±100 mA V OUT = 0V Power Off Impedance 300 Ohms V CC =0V; VOUT = ±2V AC Characteristics Transmission Rate 120 kbps Transition Time 1.56 µs Rise/fall time, +3V to -3V; -3V to +3V R L=3kΩ , CL=2500pF Propagation Delay t PHL 24 µsR L=3kΩ , CL=2500pF; From 1.5V of TIN to 50% of VOUT tPLH 36 µsR L=3kΩ , CL=2500pF; From 1.5V of TIN to 50% of VOUT Slew Rate 10 30 V/ µsR L=3kΩ , CL=50pF; From +3V to -3V or -3V to +3V RS-232 RECEIVER TTL Output Levels V OL 0.4 Volts I SINK = 4mA VOH 3.5 I SOURCE = -4mA Receiver Input High Threshold 2.1 3.0 Volts Low Threshold 0.8 1.6 Volts Input Voltage Range -15 +15 Volts Input Impedance 3 5 7 kOhms V IN=±15V Hysteresis 0.2 0.5 1.0 Volts V CC =+5V AC Characteristics Transmission Rate 120 kbps Transition Time 50 ns Rise/fall time 10% to 90% Propagation Delay t PHL 100 300 ns From 50% of V IN to 1.5V of ROUT tPLH 100 200 ns From 50% of V IN to 1.5V of ROUT POWER REQUIREMENTS No Load Supply Current 19 25 mA No load; V CC =5.0V; TA=25˚C Full Load Supply Current 90 120 mA RS-232 drivers R L=3kΩ to Gnd; DC Input RS-485 drivers R L=54Ω from A to B; DC Input Shutdown Supply Current 5 50 µAT A=25˚C, VCC =5.0V

TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation THEORY OF OPERATION... The SP332 is a single chip device that can be configured via software for either RS-232, RS- 485 or both interface modes at any time. The SP332 is made up of three basic circuit ele- ments, single-ended drivers and receivers, dif- ferential drivers and receivers and charge pump. DIFFERENTIAL DRIVER/RECEIVER... RS-485, RS-422 Drivers... The differential drivers and receivers comply with the RS-485 and RS-422 standards. The driver circuits are able to drive a minimum of 1.5V when terminated with a 54Ω resistor across the two outputs. The typical propagation delay from the driver input to output is 60ns. The driver outputs are current limited to less than 250mA, and can tolerate short circuits to ground, or to any voltage within a +10V to -7V range with no damage. RS-485, RS-422 Receivers... The differential receivers of the SP332 comply with the RS-485, RS-422 and V.11 standards. The input to the receiver is equipped with a common mode range of +12V to -7V. The input threshold over this range is a minimum of ±200mV. The differential receivers can receive data up to 10Mbps. The typical propagation delay from the receiver input to output is 90ns. SINGLE ENDED DRIVER/RECEIVER... RS-232 (V.28) Drivers... The single-ended drivers and receivers comply the with the RS-232E and V.28 standards. The drivers are inverting transmitters which accept either TTL or CMOS inputs and output the RS- 232 signals with an inverted sense relative to the input logic levels. Typically, the RS-232 driver output voltage swing is ±9V with no load and is guaranteed to be greater than ±5V under full load. The drivers rely on the V+ and V- voltages generated by the on-chip charge pump to main- tain proper RS-232 output levels. With worst case load conditions of 3kΩ and 2500pF, the four RS-232 drivers can still maintain ±5V output levels. The drivers can operate up to 120kbps; the propagation delay from input to output is typically 2µs. RS-232 (V.28) Receivers... The RS-232 receivers convert RS-232 input signals to inverted TTL signals. Each of the four receivers features 500mV of hysteresis margin to minimize the affects of noisy tranmission lines. The inputs also have a 5kΩ resistor to ground, in an open circuit situation the input of the receiver will be forced low, committing the output to a logic high state. The input resistance will maintain 3kΩ -7kΩ over a ±15V range. The maximum operating voltage range for the re- ceiver is ±30V, under these conditions the input current to the receiver must be limited to less than 100mA. Due to the on-chip ESD protection circuitry, the receiver inputs will be clamped to ±15V levels. The RS-232 receivers can operate up to 120kbps. CHARGE PUMP... The charge pump is a Sipex-patented design (5,306,954) and uses a unique approach com- pared 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 8a shows the waveform found on the positive side of capacitor C2, and Figure 8b shows the negative side of capacitor 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. C1+ is then switched to ground and charge in C1- is trans- ferred 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 -10V to C3. Simultaneously, the positive side of capacitor C1 is switched to +5V and the negative side is connected to ground.

TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation RS-232 Mode RS-485 Mode Phase 3 -Vdd charge storage- The third phase of the clock is identical to the first phase- the trans- ferred charge 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 10V. Phase 4 -Vdd transfer- The fourth phase of the clock connects the negative terminal of C2 to ground and transfers the generated 10V across C2 to C4, the Vdd 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. SP332 TYPICAL OPERATING CIRCUIT +5V GND TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS 0.1mF 0.1mF VCC TTL/CMOSSHUT DOWN RS-232 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS TX1 TX2 TX3 TX4 TI1 TI2 TI3 TI4 RI1 RI2 RI3 RI4 RX1 RX2 RX3 RX4 1 3 100.1mF 0.1mF C1+ C1- C2+ C2- SEL B2 SEL A24 5KW 5KW 5KW 5KW 400KW Vcc 400KW Vcc 400KW Vcc 400KW Vcc RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 LOOP BACK SEL A TTL/CMOS TTL/CMOS TTL/CMOS 0.1mF 0.1mF C1+ C1- C2+ C2- SEL B2 +5V VCC GND8 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS RS-485 RS-485 RS-485 TTL/CMOS 0.1mF 0.1mF TTL/CMOSSHUT DOWN RS-485 RS-485 RS-485 RI1 RI2 TX3 TX4 TX1 TX2 TI1 TI2 TI3 TI4 RX1 RX2 TTL/CMOS 21 R3 18RI4 RI3 RX3 RX4 15KW 15KW 15KW 15KW 400KW Vcc 400KW Vcc LOOP BACK RS-485 RS-485 +5V +5V SP332 SP332

TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation SEL A 0 0 1 1 SEL B 0 1 0 1 LOOPBACK 1 1 1 1 SHUTDOWN 0 0 0 0 TX4TI41 3 RI1RX1 1519 RI2RX2 1620 R3 RI3RX3 1721 R4 RI4RX4 1822 T1 TX1TI1 626 TX2TI2 727 T3 TX3TI3 428 SP332 CONTROL LOGIC CONFIGURATION T1 TX1 6TI126 T2TI2 TX2 727 R1 RI1RX1 1519 R2RX2 RI2 1620 28 4TX3 3TX4 TI3 T3 18RI4 17RI3

21 RX3 R3

28 TI3T3

Receiver Inputs are inactive in Loopback Mode (LOOPBACK = 0) Driver Outputs are Tri-Stated in Loopback Mode (LOOPBACK = 0) Unused Outputs are Tri-Stated

TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation D EH PACKAGE: PLASTIC SMALL OUTLINE (SOIC) A Ø LBe DIMENSIONS (Inches) Minimum/Maximum (mm) A B D E e H L Ø 28–PIN 0.090/0.100 (2.29/2.54) 0.004/0.010 (0.102/0.254) 0.015/0.020 (0.38/0.508) 0.720/0.730 (18.24/18.54) 0.395/0.405 (10.03/10.29)

0.050 BSC

(1.270 BSC) 0.531/0.545 (13.49/13.84) 0.021/0.041 (0.53/1.04) 0°/8° (0°/8°) 0.093/0.104 (2.352/2.649) 0.004/0.012 (0.102/0.300) 0.013/0.020 (0.330/0.508) 0.697/0.713 (17.70/18.09) 0.291/0.299 (7.402/7.600) (1.270 BSC) 0.394/0.419 (10.00/10.64) 0.016/0.050 (0.406/1.270) 0˚/8˚ (0˚/8˚) TI3 TI2 TI1 SD SEL A LB RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 TI4 SEL B TX4 TX3 VCC TX1 TX2 GND C1+ C2+ C2 - SP332

TGoddard/SP332/9617R0 SP332 RS-232/RS-485 Multi-Mode Serial Transceiver © Copyright 2000 Sipex Corporation

ORDERING INFORMATION

Model Temperature Range Package Types Corporation SIGNAL PROCESSING EXCELLENCE 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. 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

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