SP332 EXAR | Alldatasheet

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260 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 pins. The device also includes a loop back function which internally con- nects driver outputs to receiver inputs for a chip self test. An Exar-patended charge pump allows +5V-only operation.

DESCRIPTION

  • +5V Only Single Supply Operation
  • Software Programmable RS-232 or RS-485 Selection
  • 4 Drivers, 4 Receivers RS-232
  • 2 Drivers, 2 Receivers RS-485
  • Loop back function for Self Test
  • 28-pin WSOIC package SP332 TYPICAL APPLICATIONS CIRCUIT SEL A TTL/CMOS TTL/CMOS TTL/CMOS C1+ C1- C2+ C2- SEL B 2 +5V VCC GND8 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS RS-485 RS-485 RS-485 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 15KΩ 400KΩ Vcc 400KΩ Vcc RS-485 RS-485 +5V +5V +5V GND TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS 0.1µFVCC SHUTDOWN 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 C1+ C1- C2+ C2- SEL B 2 SEL A 24 5KΩ 400KΩ Vcc Vcc Vcc Vcc RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 LOOPBACK SP332 SP332 0.1µF 0.1µF 0.1µF 400KΩ 400KΩ 400KΩ 5KΩ 5KΩ 5KΩ 0.1µF 0.1µF 0.1µF 0.1µF 15KΩ 15KΩ 15KΩ TTL/CMOS SHUTDOWN LOOPBACK TTL/CMOS TTL/CMOS RS-232 Mode Full Duplex RS-485 Mode TTL/CMOS RS-232/RS-485 Multi-mode SerialTransceiver TI4 SEL_B TX4 TX3 VCC TX1 TX2 GND C1+ C2+ C1– C2– TI3 TI2 TI1 SD SEL_A LB RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 SP332

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260 SPECIFICATIONS PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RS-485 DRIVER DC Characteristics Differential Output Voltage GND Vcc Volts Unloaded; R = ∞; See Figure 1 Differential Output Voltage 2.0 5.0 Volts With load; R = 50Ω (RS-422); See Figure 1 Differential Output Voltage .5 5.0 Volts With load; R = 27Ω (RS-485); See Figure 1 Change in Magnitude of Driver Differential Output Voltage for Complementary States

0.2 Volts R = 27Ω or R = 50Ω; See Figure 1

3 Volts R = 27Ω or R = 50Ω; See Figure 1

Input High Voltage 2.0 Volts Applies to transmitter inputs, SEL A, SEL B, SD and LB Input Low Voltage 0.8 Volts Applies to transmitter inputs, SEL A, SEL B, SD and LB Input Current +/-0 µA Applies to transmitter inputs, SEL A, SEL B, SD and LB Pull-Up Current .5 µA Pull-Down Current 3.0 µA Driver Short Circuit Current VOUT = HIGH 35 250 mA -7V ≤ VO ≤ 10V Driver Short Circuit Current VOUT = LOW 35 250 mA -7V ≤ VO ≤ 10V AC Characteristics Driver Data Rate 0 Mbps Driver Data Rate 8 Mbps TA = +85°C, Note Driver Input to Output tPLH 70 80 ns RDIFF = 54Ω, CL = CL2 = 00pF; See Figures 3 and 5 Driver Input to Output tPHL 70 80 ns RDIFF = 54Ω, CL = CL2 = 00pF; See Figures 3 and 5 ABSOLUTE MAXIMUM RATINGS 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. Input Voltages Power Dissipation Package Derating: 28-pin WSOIC Limits are specified at TA = 25°C and VCC = +5.0V unless otherwise noted.

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260 PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RS-485 DRIVER (Continued) AC Characteristics Driver Skew 5 0 ns From Output to Output; See Figures 3 and 5 Driver Rise or Fall Time 3 5 40 ns From 0% to 90%; RDIFF = 54Ω, CL = CL2 = 100pF; See Figures 3 and 5 RS-485 RECEIVER DC Characteristics Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ 12V Input Hysteresis 70 mV VCM = 0V Output Voltage HIGH 3.5 Volts IO = -4mA, VID = +200mV Output Voltage LOW 0.4 Volts IO = +4mA, VID = -200mV Input Resistance 2 5 kΩ -7V ≤ VCM ≤ 12V Input Current (A, B); VIN = 2V .5 mA VIN = 12V, A is the non-inverting receiver input. B is the inverting receiver input Input Current (A, B); VIN = -7V -0.8 mA VIN = -7V Short Circuit Current 85 mA 0V ≤ VCM ≤ VCC AC Characteristics Receiver Data Rate 0 Mbps Receiver Data Rate 8 Mbps TA = +85°C, Note Receiver Input to Output tPLH 30 250 ns RDIFF = 54Ω, CL = CL2 = 00pF; Figures 3 and 6 Receiver Input to Output tPHL 30 250 ns RDIFF = 54Ω, CL = CL2 = 00pF; Figures 3 and 6 Differential Receiver Skew |tPHL - tPLH| 3 ns RDIFF = 54Ω, CL = CL2 = 00pF; Figures 3 and 6 RS-232 DRIVER DC Characteristics TTL Input Level VIL 0.8 Volts Applies to transmitter inputs, SEL A, SEL B, SD and LB TTL Input Level VIH 2.0 Volts Applies to transmitter inputs, SEL A, SEL B, SD and LB High Level Voltage Output +5.0 +5.0 Volts RL = 3kΩ to GND Low Level Voltage Output -5.0 -5.0 Volts RL = 3kΩ to GND Open Circuit Output +/-5 Volts RL = ∞ Short Circuit Current +/-00 mA VOUT = 0V Power Off Impedance 300 Ω VCC = 0V; VOUT = +/-2V AC Characteristics Transmission Rate 20 kbps Transition Time .56 µs Rise/Fall time, +3V to -3V; -3V to +3V, RL = 3kΩ, CL = 2500pF SPECIFICATIONS (continued) Limits are specified at TA = 25°C and VCC = +5.0V unless otherwise noted.

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260 SPECIFICATIONS (continued) PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RS-232 DRIVER (continued) AC Characteristics Propagation Delay; tPHL 2 4 µs RL = 3kΩ, CL = 2500pF, From .5V of TIN to 50% of VOUT Propagation Delay; tPLH 2 4 µs RL = 3kΩ, CL = 2500pF, From .5V of TIN to 50% of VOUT Slew Rate 0 30 V/µs RL = 3kΩ, CL = 50pF; From +3V to -3V or -3V to +3V RS-232 RECEIVER DC Characteristics TTL Output Level; VOL 0.4 Volts ISINK = 4mA TTL Output Level; VOH 3.5 Volts ISOURCE = -4mA Input High Threshold 2. 3.0 Volts Input Low Threshold 0.8 .6 Volts Input Voltage Range -5 +5 Volts Input Impedance 3 5 7 kΩ VIN = +/-5V Hysteresis 0.2 0.5 .0 Volts VCC = +5V AC Characteristics Transmission Rate 20 kbps Transition Time 50 ns Rise/Fall time, 0%-90% Propagation Delay tPHL 00 300 ns From 50% of VIN to 1.5V of ROUT Propagation Delay tPLH 00 200 ns POWER REQUIREMENTS No Load Supply Current 9 25 mA No Load; VCC = 5.0V; TA = 25°C Full Load Supply Current 90 20 mA RS-232 drivers RL = 3kΩ to GND, DC input RS-485 drivers RL = 54Ω from A to B; DC input Shutdown Supply Current 5 50 µA TA = 25°C, VCC = 5.0V Limits are specified at TA = 25°C and VCC = +5.0V unless otherwise noted. Note 1: Exceeding the maximum data rate may damage the device

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260 The SP332 is 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 elements, single-ended drivers and receivers, differential 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 propa - gation delay from driver input to output is 60ns. The driver outputs are current limited to less than 250mA, and can tolerate shorts 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 com- ply with the RS-485 and RS-422 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 with the RS-232 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 driv- ers rely on the V+ and V- voltages generated by the on-chip charge pump to maintain 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 transmission 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 to 7kΩ over a +/-15V range. The maximum operating voltage range for the receiver is +/-30V, under these conditions the input current to the receiver must be limited to less than 100mA. Due to the on-chip ESD protec- tion circuitry, the receiver inputs will be clamped to +/-5V levels. The RS-232 receivers can operate up to 120kbps. 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 7(a) shows the waveform found on the positive side of capci- tor C2, and Figure 7(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 C and C2 are initially charged to +5V. Cl + is then switched to ground and charge on C – is transferred to C2 –. Since C2 + is connected to +5V, the voltage potential across capacitor C2 is now 0V. Phase 2 — VSS transfer — Phase two of the clock con- nects 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 is switched to +5V and the negative side is connected to ground. THEORY OF OPERATION

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260 TYPICAL APPLICATIONS CIRCUIT SEL A TTL/CMOS TTL/CMOS TTL/CMOS C1+ C1- C2+ C2- SEL B 2 +5V VCC GND8 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS RS-485 RS-485 RS-485 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 15KΩ 400KΩ Vcc 400KΩ Vcc RS-485 RS-485 +5V +5V +5V GND TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS 0.1µFVCC SHUTDOWN 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 C1+ C1- C2+ C2- SEL B 2 SEL A 24 5KΩ 400KΩ Vcc Vcc Vcc Vcc RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 RS-232 LOOPBACK SP332 SP332 0.1µF 0.1µF 0.1µF 400KΩ 400KΩ 400KΩ 5KΩ 5KΩ 5KΩ 0.1µF 0.1µF 0.1µF 0.1µF 15KΩ 15KΩ 15KΩ TTL/CMOS SHUTDOWN LOOPBACK TTL/CMOS TTL/CMOS RS-232 Mode Full Duplex RS-485 Mode TTL/CMOS PINOUT TI4 SEL_B TX4 TX3 VCC TX1 TX2 GND C1+ C2+ C1– C2– TI3 TI2 TI1 SD SEL_A LB RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 SP332

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260 SEL A 0 0 SEL B 0 0 LB SD 0 0 0 0 SP332 CONTROL LOGIC CONFIGURATION T3 3 TX4 TX3 TX1 TX2 TI3 R1 16 15RI1 RI2 RX1 T126 TI1 R3 18 17RI3 RI4 RX3 TX4 TX3 TX1 TX2 TI3 R1 16 15RI1 RI2 RX1 RX321

26 TI1

28 TI3

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

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP332_00_0260

ORDERING INFORMATION

Model Temperature Range Package Types

REVISION HISTORy

967RO - Legacy Sipex Datasheet 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 reliabil- ity. 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. Note: /TR = Tape and Reel