® SP231A/232A/233A/310A/312A Enhanced RS-232 Line Drivers/Receivers ■ Operates from Single 5V Power Supply ■ Meets All RS-232D and V.28 Specifications ■ Multiple Drivers and Receivers ■ Small Charge Pump Capacitors – 0.1µF ■ Operates with 0.1µF and 100µF Capacitors ■ High Data Rate – 120kbps Under Load ■ High Output Slew Rate – 10V/µs Under Load ■ Low Power Shutdown ≤1µA ■ 3-State TTL/CMOS Receiver Outputs ■ ±30V Receiver Input Levels ■ Low Power CMOS – 15mA Operation DESCRIPTION… The Sipex SP231A, SP232A and SP233A are enhanced versions of the Sipex SP231, SP232 and SP233 RS-232 line drivers/receivers. They are pin-for-pin replacements for these earlier versions and will operate in their sockets. Performance enhancements include 10V/µs slew rate, 120k bits per second guaranteed transmission rate, and increased drive current for longer and more flexible cable configurations. Ease of use enhancements include smaller, 0.1µF charge pump capacitors, enhanced ESD protection, low power dissipation and overall ruggedized construction for commercial environments. The series is available in plastic and ceramic DIP and SOIC packages operating over the commercial, industrial and military temperature ranges. RS-232 OUTPUTS RS-232 INPUTS CHARGE PUMP T2 T1 R1 R2 TTL/CMOS INPUTS TTL/CMOS OUTPUTS SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers 1 © Copyright 2000 Sipex Corporation Output Voltages TOUT .................................................................................................... (V+, +0.3V) to (V-, -0.3V) ROUT ................................................................................................................ -0.3V to (Vcc +0.3V) Short Circuit Duration TOUT ......................................................................................................................................... Continuous Power Dissipation CERDIP .............................................................................. 675mW (derate 9.5mW/°C above +70°C) Plastic DIP .......................................................................... 375mW (derate 7mW/°C above +70°C) Small Outline ...................................................................... 375mW (derate 7mW/°C above +70°C) ABSOLUTE MAXIMUM RATINGS This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Vcc ................................................................................................................................................................. +6V V+ .................................................................................................................... (Vcc-0.3V) to +13.2V V- .............................................................................................................................................................. 13.2V Input Voltages TIN ......................................................................................................................... -0.3 to (Vcc +0.3V) RIN ............................................................................................................................................................ ±30V SPECIFICATIONS VCC=+5V±10%; V+=+8.5V to +13.2V (SP231A only) 0.1µF charge pump capacitors; TMIN to TMAX unless otherwise noted. PARAMETERS MIN. TTL INPUT Logic Threshold LOW HIGH 2.0 Logic Pullup Current Maximum Data Rate 120 TTL OUTPUT TTL/CMOS Output Voltage, Low Voltage, High 3.5 Leakage Current **; TA = +25° RS-232 OUTPUT Output Voltage Swing ±5 Output Resistance Output Short Circuit Current RS-232 INPUT Voltage Range Voltage Threshold LOW HIGH Hysteresis Resistance 300 TYP. MAX. UNITS CONDITIONS 0.8 Volts Volts µA kbps TIN ; EN, SD TIN ; EN, SD TIN = 0V CL = 2500pF, RL= 3kΩ Volts Volts µA IOUT = 3.2mA; Vcc = +5V IOUT = -1.0mA EN = VCC, 0V≤VOUT ≤VCC ±9 Volts ±18 Ohms mA All transmitter outputs loaded with 3kΩ to Ground VCC = 0V; VOUT = ±2V Infinite duration 15 0.4 0.05 -30 0.8 0.2 3 200 1.2 1.7 0.5 5 ±10 +30 Volts 2.4 1.0 7 Volts Volts Volts kΩ 30 µs V/µs DYNAMIC CHARACTERISTICS Propagation Delay, RS232 to TTL Instantaneous Slew Rate 1.5 Transition Region Slew Rate 10 V/µs Output Enable Time ** Output Disable Time ** POWER REQUIREMENTS VCC Power Supply Current 400 250 ns ns V+ Power Supply Current *** Shutdown Supply Current ** 10 25 15 mA mA 9 1 15 10 mA µA VCC = 5V, TA = +25°C VCC = 5V, TA = +25°C VCC = 5V, TA = +25°C TA = +25°C, -15V ≤ VIN ≤ +15V CL = 10pF, RL= 3-7kΩ; TA =+25°C CL = 2500pF, RL= 3kΩ; measured from +3V to -3V or -3V to +3V SP310A and SP312A only SP310A and SP312A only No load, TA= +25°C; VCC = 5V All transmitters RL = 3kΩ; TA = +25°C No load, V+ = 12V,TA=+25°C VCC = 5V, TA = +25°C **SP310A and SP312A only; *** SP231A only SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers 2 © Copyright 2000 Sipex Corporation -3 -4 -5 -6 -7 -8 -9 0 2 6 7 8 VT 2OUT R2 IN 10 14 5 R1 IN 13 T2 IN R2 OUT 11 10 8 9 T2 OUT R2 IN 70 1 2 3 4 5 6 7 8 9 V+ C1 C2 + C2 VT2 OUT R2 IN V– GND V+ VCC GND T1 OUT R1 IN SP310A 3 6.8 4.5 7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 16-Pin SOIC 4.75 T1 IN NC 9 C2 + C2 – 11 10 VCC GND T1 OUT R1 IN R1 OUT T1 IN T2 IN R2 OUT 17 16 15 14 13 12 11 10 © Copyright 2000 Sipex Corporation SHUTDOWN 18 20-PIN SOIC C1 + 12 9 C 2+ 15 C1 – C2 - 16 13 V- 17 T2 OUT R1 OUT 10 R2 IN R1 IN 11 18 T1 OUT 12 R2 OUT GND 13 19 VCC 14 20 V+ 5.5 15 5.25 16 VCC (Volts) 5.0 Load current = 0mA TA = 25°C 8 VOH (Volts) 14 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 125 R1 OUT T1 IN T 2IN NC T2 IN R2 OUT R2 IN T2 OUT V- C- C+ 85 SP231A Enhanced RS-232 Line Drivers/Receivers T1 IN 12 7 V- R1 OUT 13 6 C2 - R1 IN 14 5 C2 + T1 OUT C1 - 15 4 V+ GND 3 16 2 C1 + VCC 1 NC C1 + C2 + 11 10 C2 - EN V- 12 9 GND 20-PIN PLASTIC DIP C1 - 13 8 C1 + V+ T2 OUT 18 14 7 VCC R2 IN 19 C 2+ 6 GND R2 OUT 15 5 T1 OUT 25 Temperature (°C) 0 20 -40 C2 - 4 R1 IN 0 -55 VCC = 3V VCC = 4V VCC = 5V VCC = 6V V- 3 R1 OUT 40 5 10 15 20 25 30 16 2 T1 IN 35 ICC (mA) 17 1 T 2IN 17 R 2OUT T2 IN T 1IN 30 ON/OFF SP232A 18 9 10 11 R 1OUT T1 OUT 14 20 SP233ACP 12 GND 15 T1 IN R1 OUT R1 IN 15 Load Current (mA) 10 25 VCC = 6V VCC = 5V VCC = 4V T1 OUT GND VCC V+ 0 VCC 8 9 10 11 12 13 14 0 16 14-Pin Plastic DIP 12 2 4 6 8 10 12 SP233ACT SP231ADS/01 5 C2 - 7 T2 IN 4 6 R2 OUT C2 + 5 R2 IN 3 4 T2 OUT C1 - 3 V- 2 2 C- V+ 1 C+ 1 8 SP231A C1 + 6 VCC = 4V VCC = 5V VCC = 6V Load Current (mA) 4 PINOUT… V– Voltage (Volts) -10 -11 V+ (Volts) PERFORMANCE CURVES SP231A SP312A packages, operating over the commercial, industrial and military temperature ranges. The SP233A is available in a 20-pin plastic DIP and 20–pin SOIC package for operation over the commercial and industrial temperature ranges. The SP310A and SP312A are available in 18-pin plastic, CERDIP and SOIC packages for operation over the commercial and industrial temperature ranges. Please consult the factory for DIP and surface-mount packaged parts supplied on tape-on-reel, as well as parts screened to MIL-M-38510. FEATURES… The Sipex SP231A, SP232A and SP233A are enhanced versions of the Sipex SP231, SP232 and SP233 RS-232 line drivers/receivers. They arepinfor-pin replacements for these earlier versions, will operate in their sockets with capacitors ranging from 0.1 to 100µF, either polarized or non–polarized, and feature several improvements in both performance and ease of use. Performance enhancements include 10V/µs slew rate, 120k bits per second guaranteed transmission rate, and increased drive current for longer and more flexible cable configurations. Ease of use enhancements include smaller, 0.1µF charge pump capacitors, enhanced ESD protection, low power dissipation and overall ruggedized construction for commercial environments. THEORY OF OPERATION The SP231A, SP232A, SP233A, SP310A and SP312A devices are made up of three basic circuit blocks – 1) a driver/transmitter, 2) a receiver and 3) a charge pump. Each block is described below. The SP232A, SP233A, SP310A and SP312A include charge pump voltage converters which allow them to operate from a single +5V supply. These converters convert the +5V input power to the ±10V needed to generate the RS-232 output levels. Both meet all EIA RS-232D and CCITT V.28 specifications. The SP231A has provisions for external V+ supplies. With this power supplied externally, the current drain due to charge pump operation is considerably reduced, typically to 400µA. Driver/Transmitter The drivers are inverting transmitters, which accept TTL or CMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Typically the RS-232 output voltage swing is ±9V. Even under worst case loading conditions of 3kOhms and 2500pF, the output is guaranteed to be ±5V, which is consistent with the RS-232 standard specifications. The transmitter outputs are protected against infinite short-circuits to ground without degradation in reliability. The SP310A provides identical features as the SP232A. The SP310A has a single control line which simultaneously shuts down the internal DC/ DC converter and puts all transmitter and receiver outputs into a high impedance state. The SP312A is identical to the SP310A with separate tri-state and shutdown control lines. The instantaneous slew rate of the transmitter output is internally limited to a maximum of 30V/ µs in order to meet the standards [EIA RS-232-D 2.1.7, Paragraph (5)]. However, the transition region slew rate of these enhanced products is typically 10V/µs. The smooth transition of the loaded output from VOL to VOH clearly meets the monotonicity requirements of the standard [EIA RS-232-D 2.1.7, Paragraphs (1) & (2)]. The SP231A is available in 14-pin plastic DIP, CERDIP and 16-pin SOIC packages for operation over commercial, industrial and military temperature ranges. The SP232A is available in 16-pin plastic DIP, SOIC and CERDIP S1 S3 VCC S1 V+ = 2VCC + S2 C1 + S4 FROM VOLTAGE DOUBLER C3 GND V CC GND + S2 C2 + S4 GND INTERNAL OSCILLATOR C4 V- = -(V+) INTERNAL OSCILLATOR Figure 1. Charge Pump Voltage Doubler SP231ADS/01 S3 V+ Figure 2. Charge Pump Voltage Inverter SP231A Enhanced RS-232 Line Drivers/Receivers 4 © Copyright 2000 Sipex Corporation Receivers The receivers convert RS-232 input signals to inverted TTL signals. Since the 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 500mV. This ensures that the receiver is virtually immune to noisy transmission lines. As shown in Figure 1, an internal oscillator triggers the charge accumulation and voltage inversion. The voltage doubler momentarily stores a charge on capacitor C1 equal to Vcc, referenced to ground. During the next transition of the oscillator this charge is boot-strapped to transfer charge to capacitor C3. The voltage across C3 is now from Vcc to V+. The input thresholds are 0.8V minimum and 2.4V maximum, again well within the ±3V RS-232 requirements. The receiver inputs are also protected against voltages up to ±30V. Should an input be left unconnected, a 5kOhm pulldown resistor to ground will commit the output of the receiver to a high state. In the inverter section (Figure 2), the voltage across C3 is transferred to C2 forcing a range of 0V to V+ across C2. Boot-strapping of C2 will then transfer charge to C4 to genrate V-. One of the significant enhancements over previous products of this type is that the values of the capacitors are no longer critical and have been decreased in size considerably to 0.1µF. Because the charge pump runs at a much higher frequency, the 0.1µF capacitors are sufficient to transfer and sustain charges to the two transmitters. In actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied to the receiver circuitry. This occurs, for example, when a PC user attempts to print, only to realize the printer wasn’t turned on. In this case an RS-232 signal from the PC will appear on the receiver input at the printer. When the printer power is turned on, the receiver will operate normally. All of these enhanced devices are fully protected. APPLICATION HINTS Protection From Shorts to ±15V The driver outputs are protected against shorts to ground, other driver outputs, and V+ or V-. If the possibility exists that the outputs could be inadvertently connected to voltages higher than ±15V, then it is recommended that external protection be provided. For protection against voltages exceeding ±15V, two back-to-back zener diodes connected from each output to ground will clamp the outputs to an acceptable voltage level. Charge Pump The charge pump section of the these devices allows the circuit to operate from a single +5V ±10% power supply by generating the required operating voltages internal to the devices. The charge pump consists of two sections — 1) a voltage doubler and 2) a voltage inverter. +5V INPUT 10 µF 6.3V V+ (+8.5V to +13.2V) + 16 1 C 1- CC +12V to -12V Voltage Inverter V+ 0.1µ F 16V 3 + 8 T1 11 T2 4 RS-232 OUTPUTS 400k Ω T1 IN T 1OUT 400k Ω T2 IN R 1 OUT 7 9 10 R1 T 2OUT R 1 IN 5k Ω R 2 OUT 6 5 R2 5k Ω SP231A R 2 IN RS-232 INPUTS TTL/CMOS OUTPUTS TTL/CMOS INPUTS V- 14 TTL/CMOS OUTPUTS TTL/CMOS INPUTS 0.1µ F + 6.3V 2 V C 1+ 0.1µ F + 6.3V 3 4 C + 0.1µ F + 16V 5 C 2+ V 1 C 1- C 2- CC +5V to +10V Voltage Doubler +10V to -10V Voltage Inverter V+ V- 0.1µ F 6.3V 2 + 6 * + 0.1µ F 16V 400k Ω T1 IN 11 T1 14 RS-232 OUTPUTS 13 1 T 1OUT 400k Ω T2 IN R 1 OUT 10 T2 12 7 13 R1 T 2OUT R 1 IN 5k Ω R 2 OUT 9 8 R2 R 2 IN 5k Ω SP232A RS-232 INPUTS +5V INPUT GND 15 GND 12 *The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended. Figure 3. Typical Circuits using the SP231A and 232A. SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers 5 © Copyright 2000 Sipex Corporation +5V INPUT +5V INPUT 7 3 4 R1 T 2OUT R 1 IN 5k Ω R 2 OUT Do not make connection to these pins Internal -10V Power Supply Internal +10V Power Supply 20 8 13 12 17 14 19 R2 5k Ω C 1+ C 1- C + 11 V- C 2 + 15 C2 SP233A GND GND 6 C2 - T2 IN R 1 OUT R 2 OUT Internal -10V Power Supply Internal +10V Power Supply 10 16 9 1 400k Ω 3 T1 5 T2 18 4 R1 T 1OUT T 2OUT R 1 IN 5k Ω Do not make connection to these pins 2 VV+ R 2 IN T1 IN 400k Ω 20 R2 13 C + 1 14 10 17 8 19 5k Ω R 2 IN C 2 + 12 C 1- C 2 + 15 V- C2 - VV+ RS-232 OUTPUTS T2 18 T 1OUT V CC 2 RS-232 INPUTS R 1 OUT 400k Ω TTL/CMOS OUTPUTS TTL/CMOS INPUTS T2 IN 1 T1 5 RS-232 OUTPUTS T1 IN 400k Ω RS-232 INPUTS TTL/CMOS OUTPUTS TTL/CMOS INPUTS 7 V CC 2 SP233ACT GND GND 6 C2 - 11 16 9 Figure 4. Typical Circuits using the SP233ACP and SP233ACT After the ring indicator signal has propagated through the SP312A receiver, it can be used to trigger the power management circuitry of the computer to power up the microprocessor, and bring the SD pin of the SP312A to a logic high, taking it out of the shutdown mode. The receiver propagation delay is typically 1µs. The enable time for V+ and V– is typically 2ms. After V+ and V– have settled to their final values, a signal can be sent back to the modem on the data terminal ready (DTR) pin signifying that the computer is ready to accept and transmit data. Shutdown (SD) and Enable (EN) SP310A/SP312A Only Both the SP310A and SP312A have a shut-down/ standby mode to conserve power in battery-powered systems. To activate the shutdown mode, which stops the operation of the charge pump, a logic “0” is applied to the appropriate control line. For the SP310A, this control line is ON/OFF (pin 18). Activating the shutdown mode also puts the SP310A transmitter and receiver outputs in a high impedance condition (tri-stated). The shutdown mode is controlled on the SP312A by a logic “0” on the SHUTDOWN control line (pin 18); this also puts the transmitter outputs in a tri–state mode. The receiver outputs can be tri–stated separately during normal operation or shutdown by a logic “1” on the ENABLE line (pin 1). Pin Strapping — SP233ACT Only The SP233A packaged in the 20–pin SOIC package (SP233ACT) has a slightly different pinout than the SP233A in other package configurations. To operate properly, the following pairs of pins must be externally wired together: Wake–Up Feature (SP312A Only) The SP312A has a wake–up feature that keeps all the receivers in an enabled state when the device is in the shutdown mode. Table 1 defines the truth table for the wake–up function. the two V– pins (pins 10 and 17) the two C2+ pins (pins 12 and 15) the two C2– pins (pins 11 and 16) All other connections, features, functions and performance are identical to the SP233A as specified elsewhere in this data sheet. With only the receivers activated, the SP312A typically draws less than 5µA supply current (10µA maximum). In the case of a modem interfaced to a computer in power down mode, the Ring Indicator (RI) signal from the modem would be used to "wake up" the computer, allowing it to accept data transmission. SD 0 0 1 1 EN 0 1 0 1 Power Up/Down Down Down Up Up Receiver Outputs Enable Tri–state Enable Tri–state Table 1. Wake-up Function Truth Table. SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers 6 © Copyright 2000 Sipex Corporation +5V INPUT +5V INPUT 10 µF 6.3V 10 µF 6.3V + + C 2- +5V to +10V Voltage Doubler +10V to -10V Voltage Inverter V- 7 + * 0.1 µF 16V T1 15 T2 8 T 1OUT 400k Ω T2 IN R 1 OUT 11 13 14 R1 T 2OUT R 1 IN 5k Ω R 2 OUT 10 9 R2 R 2 IN 5k Ω SP310A 18 TTL/CMOS OUTPUTS 12 RS-232 OUTPUTS 400k Ω T1 IN 17 2 0.1 µF 16V 3 + V+ ON/OFF 0.1µ F + 6.3V 4 5 C + 0.1µ F + 16V 6 C 2+ V 1 C 1- C 2- CC +5V to +10V Voltage Doubler V+ +10V to -10V Voltage Inverter V- 0.1µ F 16V 3 + 7 * + 0.1µ F 16V 400k Ω T1 IN 12 T1 15 T2 8 RS-232 OUTPUTS C 1- CC T 1OUT 400k Ω T2 IN R 1 OUT 11 13 14 R1 T 2OUT R 1 IN 5k Ω R 2 OUT 10 9 R2 R 2 IN 5k Ω EN 1 GND 16 SP312A 18 RS-232 INPUTS 0.1µ F + 16V 6 C 2+ V 1 RS-232 INPUTS TTL/CMOS OUTPUTS TTL/CMOS INPUTS C + TTL/CMOS INPUTS 17 2 0.1µ F + 6.3V 4 5 SHUTDOWN GND 16 *The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended. *The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended. Figure 5. Typical Circuits using the SP310A and SP312A SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers 7 © Copyright 2000 Sipex Corporation ORDERING INFORMATION Model ....................................................................................... Temperature Range ................................................................................ Package SP231ACP ..................................................................................... 0°C to +70°C ....................................................................... 14–pin Plastic DIP SP231ACT ..................................................................................... 0°C to +70°C ................................................................................ 16–pin SOIC SP231ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice SP231AEP ................................................................................... –40°C to +85°C ..................................................................... 14–pin Plastic DIP SP231AET ................................................................................... –40°C to +85°C .............................................................................. 16–pin SOIC SP232ACN ..................................................................................... 0°C to +70°C ........................................................................... 16–pin N–SOIC SP232ACP ..................................................................................... 0°C to +70°C ....................................................................... 16–pin Plastic DIP SP232ACT ..................................................................................... 0°C to +70°C ................................................................................ 16–pin SOIC SP232ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice SP232AEN ................................................................................... –40°C to +85°C .......................................................................... 16–pin N-SOIC SP232AEP ................................................................................... –40°C to +85°C ..................................................................... 16–pin Plastic DIP SP232AET ................................................................................... –40°C to +85°C .............................................................................. 16–pin SOIC SP233ACP ..................................................................................... 0°C to +70°C ....................................................................... 20–pin Plastic DIP SP233ACT ..................................................................................... 0°C to +70°C ................................................................................ 20–pin SOIC SP233AEP ................................................................................... –40°C to +85°C ..................................................................... 20–pin Plastic DIP SP233AET ................................................................................... –40°C to +85°C .............................................................................. 20–pin SOIC SP310ACP ..................................................................................... 0°C to +70°C ....................................................................... 18–pin Plastic DIP SP310ACT ..................................................................................... 0°C to +70°C ................................................................................ 18–pin SOIC SP310ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice SP310AEP ................................................................................... –40°C to +85°C ..................................................................... 18–pin Plastic DIP SP310AET ................................................................................... –40°C to +85°C .............................................................................. 18–pin SOIC SP312ACP ..................................................................................... 0°C to +70°C ....................................................................... 18–pin Plastic DIP SP312ACT ..................................................................................... 0°C to +70°C ................................................................................ 18–pin SOIC SP312ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice SP312AEP ................................................................................... –40°C to +85°C ..................................................................... 18–pin Plastic DIP SP312AET ................................................................................... –40°C to +85°C .............................................................................. 18–pin SOIC Please consult the factory for pricing and availability on a Tape-On-Reel option. 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: [email protected] 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. SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers 8 © Copyright 2000 Sipex Corporation