® SP230A/234A/235A/236A/237A/238A/241A SP235B/236B/240A/240B/241A/241B +5V Powered Multi-Channel RS-232 Drivers/Receivers ■ ■ ■ ■ ■ ■ Operates from Single +5V Power Supply Meets All RS-232D and V.28 Specifications ±9V Output Swing with +5V Supply Improved Driver Output Capacity for Mouse Applications Low Power Shutdown – 1µA WakeUp Feature in Shutdown Mode 3–State TTL/CMOS Receiver Outputs ±30V Receiver Input Levels Low Power CMOS – 5mA Operation Wide Charge Pump Capacitor Value Range – 1-10µF T 1 OUT 1 16 T3 OUT T2 OUT 2 15 T 4 OUT T2 IN 3 14 T 4 IN T1 IN 4 13 T3 IN GND 5 12 V- VCC 6 11 C2 - C1+ 7 10 C2 + V+ 8 9 C1 - SP234A ■ ■ ■ ■ Now Available in Lead Free Packaging DESCRIPTION… The SP230A Series are multi–channel RS-232 line drivers/receivers that provide a variety of configurations to fit most communication needs, especially where ±12V is not available. Some models feature a shutdown mode to conserve power in battery-powered systems. Some require no external components. All, except one model, feature a built-in charge pump voltage converter, allowing them to operate from a single +5V power supply. All drivers and receivers meet all EIA RS-232D and CCITT V.28 requirements. The Series is available in plastic DIP and SOIC packages. SELECTION TABLE Model SP230A SP234A SP235A SP235B SP236A SP236B SP237A SP238A SP240A SP240B SP241A SP241B Date: 8/3/04 Power Supplies +5V +5V +5V +5V +5V +5V +5V +5V +5V +5V +5V +5V No. of RS-232 Drivers 5 4 5 5 4 4 5 4 5 5 4 4 No. of RS-232 Rcvrs 0 0 5 5 3 3 3 4 5 5 5 5 External Low Power TTL Wake- No. of Components Shutdown 3–State Up Pins 4 Capacitors Yes No No 20 4 Capacitors No No No 16 None Yes Yes No 24 None Yes Yes Yes 24 4 Capacitors Yes Yes No 24 4 Capacitors Yes Yes Yes 24 4 Capacitors No No No 24 4 Capacitors No No No 24 4 Capacitors Yes Yes No 44 4 Capacitors Yes Yes Yes 44 4 Capacitors Yes Yes No 28 4 Capacitors Yes Yes Yes 28 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 1 © Copyright 2004 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 ELECTRICAL CHARACTERISTICS All units Vcc=+5V±10%; except SP235A/B, Vcc=+5V±5%; All specifications TMIN to TMAX unless otherwise noted. PARAMETERS POWER REQUIREMENTS Vcc Power Supply Current Shutdown Supply Current LOGIC INPUTS Input Logic Threshold Low High Logic Pullup Current RS-232 INPUTS RS-232 Input Voltage Range RS-232 Input Threshold Low High RS-232 Input Hysteresis RS-232 Input Resistance LOGIC OUTPUTS Output Voltage Low High Output Leakage Current RS-232 OUTPUTS Output Enable Time MIN. TYP. MAX. 5 10 mA No load, TA= +25°C 1 10 µA TA = +25°C 0.8 200 Volts Volts µA +30 Volts 2.4 1.0 7 Volts Volts Volts kOhms 2.0 15 -30 0.8 0.2 3 1.2 1.7 0.5 5 0.4 3.5 0.05 ±10 UNITS Volts Volts µA 400 ns Output Disable Time 250 ns Propagation Delay Instantaneous Slew Rate 1.5 30 RS-232 OUTPUTS Transition Region Slew Rate µs V/µs 3 V/µs ±5 ±9 Volts Output Resistance 300 RS-232 Output Short Circuit Current ±10 Ohms mA Output Voltage Swing Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 2 CONDITIONS TIN ; EN, SD TIN ; EN, SD TIN = 0V Vcc = 5V, TA = +25°C Vcc = 5V, TA = +25°C Vcc = 5V TA = +25°C, -15V ≤ VIN ≤ +15V IOUT = 3.2mA IOUT = 1.0mA EN = VCC, 0V≤VOUT ≤Vcc SP235A/B, SP236A/B, SP241A/B SP235A/B, SP236A/B, SP241A/B RS232 to TTL CL = 10pF, RL= 3–7kΩ; TA = +25°C CL = 2500pF, RL= 3kΩ; measured from +3V to -3V or -3V to +3V All transmitter outputs loaded with 3kΩ to Ground VCC= 0V; VOUT = ±2V Infinite duration © Copyright 2004 Sipex Corporation Transmitter Output Waveforms TIN 5V 0V TIN 5V 0V 0V TOUT 0V TOUT RL = 3kΩ, CL = 2,500pF No load Transmitter Propagation Delay TIN TIN TOUT TOUT Rise Time RL = 3kΩ; CL = 2,500pF All inputs = 20kHz Fall Time RL = 3kΩ; CL = 2,500pF Receiver Output Waveform Shutdown to V+, V– Rise Time SD In 5V 0V V+ 0V Out V– Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 3 © Copyright 2004 Sipex Corporation Receiver Propagation Delay RIN ROUT 5V 0V RIN 5V 0V ROUT 5V 0V Fall Time Rise Time PINOUT T4 OUT T 1 OUT 1 16 T3 OUT T4 OUT 1 24 R3 IN 19 T5 IN T2 OUT 2 15 T 4 OUT T3 OUT 2 23 R3 OUT T2 OUT 3 18 NC T2 IN 3 14 T 4 IN T1 OUT 3 22 T5 IN T2 IN 4 17 SD T1 IN 4 13 T3 IN T2 OUT 4 21 SD T1 IN 5 16 T5 OUT GND 5 12 V- R2 IN 5 20 EN GND 6 15 T 4 IN VCC 6 11 C2 - R 2 OUT 6 19 T5 OUT VCC 7 14 T 3 IN C1+ 7 10 C2 + T2 IN 7 18 R4 IN C1 + 8 13 V- V+ 8 9 C1 - T1 IN 8 17 R4 OUT V+ 9 12 C2 - R 1 OUT 9 16 T4 IN C1 - 10 11 C2 + R 1 IN 10 15 T3 IN GND 11 14 R 5OUT VCC 12 13 R 5IN 1 24 T4 OUT T1 OUT 2 23 R2 IN T2 OUT 3 22 R2 OUT SD R1 IN 4 21 SD 20 EN R1 OUT 5 20 EN 19 T4 IN T 2IN 6 19 T4 IN 18 T3 IN T1 IN 7 18 T3 IN 17 R 3 OUT GND 8 17 R 3 OUT VCC 9 16 R 3 IN C1+ 10 15 V- V+ 11 14 C2 - C1- 12 13 C2 + R3 IN T3 OUT 1 24 T4 OUT 23 R3 OUT T1 OUT 2 23 R2 IN T1 OUT 3 22 T5 IN T2 OUT 3 22 R2 OUT T2 OUT 4 21 SD R1 IN 4 21 R2 IN 5 20 EN R1 OUT 5 R 2 OUT 6 19 T5 OUT T 2IN 6 T2 IN 7 18 R4 IN T1 IN 7 T1 IN 8 17 R4 OUT GND 8 SP236A 24 2 SP235B 1 T3 OUT R 1 OUT 9 16 T4 IN VCC 9 16 R 3 IN R 1 IN 10 15 T3 IN C1+ 10 15 V- GND 11 14 R 5OUT V+ 11 14 C2 - VCC 12 13 R 5IN C1- 12 13 C2 + + 5V Powered Multi-Channel RS-232 Drivers/Receivers 4 SP236B T3 OUT T4 OUT Date: 8/3/04 SP235A 20 2 SP234A 1 T1 OUT SP230A T3 OUT © Copyright 2004 Sipex Corporation Receiver Output Enable/Disable Times 5V 5V EN IN EN IN 0V 0V 5V 5V ROUT ROUT 0V 0V Disable Enable PINOUT 24 T4 OUT T2 OUT 1 24 T3 OUT 2 23 R2 IN T1 OUT 2 23 R3 IN T2 OUT 3 22 R2 OUT R 2IN 3 22 R3 OUT R1 IN 4 21 T5 IN R 2OUT 4 21 T4 IN R1 OUT 5 20 T5 OUT T 1IN 5 20 T4 OUT T2 IN 6 19 T4 IN R 1 OUT 6 19 T3 IN T1 IN 7 18 T3 IN R 1IN 7 18 T2 IN GND 8 17 R 3OUT GND 8 17 R 4OUT VCC 9 16 R 3IN VCC 9 16 R 4IN C1+ 10 15 V- C1+ 10 15 V- V+ 11 14 C2 - V+ 11 14 C2 - C1- 12 13 C2 + C1- 12 13 C2 + N.C. SHUTDOWN EN T5OUT R4IN R4OUT T4IN T3IN R5OUT R5IN N.C. 28 T4 OUT T 3OUT 1 28 T4 OUT 2 27 R 3 IN T 1 OUT 2 27 R 3 IN T2 OUT 3 26 R 3 OUT T2 OUT 3 26 R 3 OUT R 2 IN 4 25 SHUTDOWN (SD) R 2 IN 4 25 SHUTDOWN (SD) R 2 OUT 5 24 EN R 2 OUT 5 24 EN T2 IN 6 23 R 4 IN T2 IN 6 23 R 4 IN T1 IN 7 22 R 4 OUT T1 IN 7 22 R 4 OUT R 1 OUT 8 21 T4 IN R 1 OUT 8 21 T4 IN R 1 IN 9 20 T3 IN R 1 IN 9 20 T3 IN GND 10 19 R 5 OUT GND 10 19 R 5 OUT VCC 11 18 R 5 IN VCC 11 18 R 5 IN C1 + 12 17 V- C1 + 12 17 V- V+ 13 16 C 2- V+ 13 16 C 2- C1 - 14 15 C 2+ C1 - 14 15 C 2+ 1 2 3 4 5 6 7 8 9 10 11 N.C. R2OUT T2IN T1IN R1OUT R1IN GND VCC N.C. N.C. N.C. 12 13 14 15 16 17 18 19 20 21 22 SP240A/B Date: 8/3/04 33 32 31 30 29 28 27 26 25 24 23 N.C. N.C. N.C. V– C2– C2+ C1– V+ C1+ N.C. N.C. + 5V Powered Multi-Channel RS-232 Drivers/Receivers 5 SP241B 1 T 1OUT SP241A T 3OUT 44 43 42 41 40 39 38 37 36 35 34 SP238A 1 T1 OUT SP237A N.C. T5IN R3OUT R3IN T4OUT T3OUT T1OUT T2OUT N.C. R2IN N.C. T3 OUT © Copyright 2004 Sipex Corporation THEORY OF OPERATION The SP230A/B–241A/B series devices are made up of three basic circuit blocks – 1) transmitter, 2) receiver and 3) charge pump. Each model within the series incorporates variations of these circuits to achieve the desired configuration and performance. FEATURES… The multi–channel RS-232 line drivers/receivers provides a variety of configurations to fit most communication needs, especially those applications where ±12V is not available. The SP230A, SP235A/B, SP236A/B, SP240A/B, and SP241A/B feature a shutdown mode which reduces device power dissipation to less than 5µW. All feature low power CMOS operation, which is particularly beneficial in batterypowered systems. The SP235A/B use no external components and are ideally suited where printed circuit board space is limited. 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 3kΩ 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. All products in the Series include two 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. An internal charge pump converter produces the necessary –12V supply. All drivers and receivers meet all EIA RS-232D and CCITT V.28 specifications. The drivers of the SP230A, SP235A/B, SP236A/B, SP240A/B and SP241A/B can be tri-stated by using the SHUTDOWN function. In this “power-off” state, the output impedance will remain greater than 300 Ohms, again satisfying the RS-232 specifications. Should the input of the driver be left open, an internal 400kΩ pull–up resistor to VCC forces the input high, thus committing the output to a low state. The Series are available for use over the commercial, industrial and military temperature ranges. They are packaged in plastic DIP and SOIC packages. For product processed and screened to MIL–M–38510 and MIL–STD–883C requirements, please consult the factory. The slew rate of the transmitter output is internally limited to a maximum of 30V/µs in order to meet the 20kbps 100kbps 10Mbps 10Mbps 64kbps Table 1. EIA Standards Definition Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 6 © Copyright 2004 Sipex Corporation standards [EIA RS-232–D 2.1.7, Paragraph (5)]. The 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)]. S3 S1 V V+ = 2VCC CC + S2 C1 + S4 C3 V GND 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. CC INTERNAL OSCILLATOR Figure 1. Charge Pump Voltage Doubler 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. 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 5kΩ pulldown resistor to ground will commit the output of the receiver to a high state. 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, reference 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+. 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 series devices are fully protected. Again, to facilitate use in “real-world” applications, the receiver outputs can be tri–stated by bringing the ENABLE (EN) pin high, with the driver remaining full active. 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 generate V-. The values of the capacitors are somewhat non-critical and can be varied, however the performance will be affected. As C3 and C4 are reduced, higher levels of ripple will appear. Lower values of C1 and C2 will increase the Charge Pump The charge pump section of the SP230A series allows the circuit to operate from a single +5V, ±10% power 10.5 10.5 10.0 10.0 9.5 9.5 9.0 9.0 8.5 V- (Abs.) V+ (Abs.) 8.5 VCC =5.5V 8.0 7.5 VCC =5V 7.0 8.0 7.0 6.5 6.5 VCC=4.5V 6.0 6.0 5.5 5.5 VCC =5V VCC=4.5V 5.0 5.0 0 a) VCC =5.5V 7.5 5 10 15 20 25 30 35 0 40 5 b) V+ IOUT (mA) 10 15 20 25 30 35 40 V- I OUT (mA) Charge Pump Output Loading versus VCC; a) V+; b) V– Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 7 © Copyright 2004 Sipex Corporation SD 0 0 1 1 Power Up/Down Up Up Down Down EN 0 1 0 1 ENABLE Input (EN) The SP235A/B, SP236A/B, SP240A/B, and SP241A/B all feature an enable input (EN), which allows the receiver outputs to be either tri–stated or enabled. The enable input is active low; 0V applied to EN will enable the receiver outputs. This can be especially useful when the receiver is tied directly to a microprocessor data bus. Receiver Outputs Enable Tri–state Enable Tri–state Table 2. Wake–Up Truth Table Protection From Shorts to >±15V The driver outputs are protected against shorts to ground, other driver outputs, and V+ or V-. For protection against voltages exceeding ±15V, two back–to–back zener diodes connected to clamp the outputs to an acceptable voltage level are recommended. (Refer to Figure 3.) output impedance of V+ and V-, which will degrade VOH and VOL. Capacitor values can be as low as 1.0µF. Shutdown (SD) TheSP230A, SP235A/B, SP236A/B, SP240A/ B and SP241A/B all feature a control input which will disable the part and reduce VCC current typically to less than 5µA, which is especially useful to designers of battery–powered systems. In the “power–off” mode the receiver and transmitter will both be tri-stated. V+ will discharge to VCC, and V- will discharge to ground. Improved Drive Capability for Mouse Applications Each of the devices in this data sheet have improved drive capability for non-standard applications. Although the EIA RS-232D standards specify the maximum loading to be 3kΩ and 2500pF, the SP230A, SP234A, SP235A/B, SP236A/B, SP237A, SP238A, SP240A/B, and SP241A/B can typically drive loads as low as 1kΩ and still maintain ±5V outputs. This feature is especially useful when the serial port is intended to be used for a “self-powered” mouse. In this case the voltage necessary to operate the circuits in the mouse can be derived from the RS-232 driver output as long as the loading is ≥1kΩ (refer to Figure 4). For applications which even exceed this requirement, drivers can be connected in parallel, increasing the drive capability to 750Ω, while maintaining the ±5V VOH and VOL levels (refer to Figure 5). For complete shutdown to occur and the 10µA current drain to be realized, the following conditions must be met: • +5.00V must be applied to the SD pin; • ENABLE must either 0V, +5.0V or not connected; • the transmitter inputs must be either +5.0V or not connected; • VCC must be +5V; • Receiver inputs must be >0V and <+5V Please note that for proper operation, the SD input pin must never be left floating. S1 T1 IN S3 V+ FROM VOLTAGE DOUBLER + S2 C2 + S4 GND 15V ZENER C4 V- = -(V+) T2 IN INTERNAL OSCILLATOR T2 OUT 15V ZENER Figure 2. Charge Pump Voltage Inverter Date: 8/3/04 T1 OUT GND Figure 3. High Voltage Short Circuit Protection + 5V Powered Multi-Channel RS-232 Drivers/Receivers 8 © Copyright 2004 Sipex Corporation 10 9 VOL/VOH (Volts) 8 7 T IN T OUT 6 VOH vs IOH 5 4 VOL vs IOL 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 IOL/IOH (mA) Figure 4. Mouse Application Drive Capability Figure 5. Parallel Drivers Wake-Up Feature The SP235B, SP236B, SP240B and SP241B have a wake-up feature that keeps all receivers in an enabled state when the device is in the shutdown mode. Table 2 defines the truth table for the wake-up function. Timing for the wake-up function is shown in Figure 6. If the SP235B, SP236B, SP240B and SP241B are powered up in the shutdown state (SD driven high during VCC power up), the part must remain in a powered on state for a minimum of 3ms before the wake-up function can be used. After the 3ms wait time, there is a 2ms delay time before data is valid for both enable and disable POWER-UP WITH SD HIGH (charge pump section in shutdown state) t0 (power up) +5V DATA ROUT VALID 0V tWAIT +5V SD 0V POWER-UP WITH SD LOW (charge pump section in active mode) t0 (power up) +5V ROUT DATA VALID 0V +5V tENABLE SD 0V EXERCISING WAKE–UP FEATURE t0 (power up) +5V ROUT DATA VALID 0V +5V SD DATA VALID tENABLE DATA VALID tENABLE tENABLE tWAIT 0V SPECIFICATIONS: (VCC =+5V±10%, TA=25°C) PARAMETER MIN. TYP. tWAIT 2ms tENABLE 1ms MAX. 3ms 2ms Figure 6. Wake–Up and Shutdown Timing Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 9 © Copyright 2004 Sipex Corporation of the charge pump. If the SP2XXB is powered up with SD low, then only the 2ms delay time will apply (refer to Figure 6). Under normal operation, both the wait time and delay time should be transparent to the user. at these minimum values, the supply voltage must be maintained at +5.0V ±5%. Also, the ambient operating temperature must be less than 60°C. The capacitor values must be chosen to suit the particular application. The designer must balance board space, cost and performance to maximize the design. The capacitors can be polarized or non–polarized, axial-leaded or surface-mount. As the size and value decrease, so does the cost; however, the value should be chosen to accommodate worst-case load conditions. With only the receivers activated, the device typically draws less than 5µA (10µA max) supply current. In the case of a modem interfaced to a computer in power-down mode, the RI (ring indicator) signal from the modem would be used to “wake up” the computer, allowing it to accept the data transmission. INTERFACE EXAMPLE – A MODEM ON THE IBM PC SERIAL PORT After the ring indicator signal has propagated through the SP2XXB receiver, it can be used to trigger the power management circuitry of the computer to power up the microprocessor and bring the SD pin to the SP2XXB low, taking it out of shutdown. 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 DTR (Data Terminal Ready) pin signifying that the computer is ready to accept and transmit data. The RS-232 standard defines 22 serial interface signals. These signals consist of ground lines, timing, data, control and test signals, plus a set of signals rarely used for a second data channel. Many of these signal lines are not used in typical RS-232 applications; in fact, the IBM® PC serial port is implemented using only nine pins. For example, consider the case of a PC using this nine pin port to communicate with a peripheral device such as a modem. We see the following activity on each of the RS-232 lines as the computer and modem are activated and communicate with each other as well as the remote modem at the other end of the phone line. All receivers that are active during shutdown maintain 500mV (typ.) of hysteresis. Varying Capacitor Values As stated earlier, the capacitor values are somewhat non-critical. Since they are an actual component of the charge pump circuitry, their value will affect its performance, which in turn affects the VOH and VOL levels. There is no upper limit for the value of any of the four capacitors; lower values will impact performance. C1 and C2 are responsible for the charge accumulation and can be reduced to 1µF; this will increase the output impedance of V+ and V–. Reducing these capacitor values will limit the ability of the SP2XXA/B to maintain the dc voltages needed to generate the RS-232 output levels. Capacitors C3 and C4 can also be reduced to 1µF; doing so will increase the ripple on V+ and V–. Signal Ground (GND) The Signal Ground pin acts as a reference for all the other signals. This pin is simply maintained at a 0V level to serve as a level to which all other signals are referenced. Both the PC and the modem will have this line connected to their respective internal ground lines. Ring Indicator R 22 Data Carrier Detect R Ring Indicator D 20 D Data Terminal Ready R 8 Data Terminal Ready D Data Carrier Detect 7 Signal Ground Signal Ground Data Set Ready R Clear To Send R R Received Data Transmitted Data (To Be Printed) Typically each driver will require 1µF of capacitance as a minimum to operate within all specified parameters; if five drivers are active in the circuit, then C3 and C4 should be 5µF. In order to operate 5 4 D Ready To Send 6 Clear To Send Ready To Send D Received Data Received Data (To Be Printed) R SP239A SP237A r Mod pute Com Data Set Ready D R 3 2 D D em IBM Modem Port Interconnections Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 10 © Copyright 2004 Sipex Corporation Data Terminal Ready (DTR) This is the pin the computer uses to tell peripheral devices that it is on–line and ready to communicate. path with the remote modem, and to expect to start receiving data at any time. Received Data (RD or RX) This is the pin on which the modem sends the computer the incoming data signal, i.e. a positive voltage (+3V to +15V) to represent a logic “0”, and a negative voltage (-3V to -15V) to represent a logic “1”. Data Set Ready (DSR) Peripheral devices use this line to tell the computer that they are on–line and ready to communicate. When the modem is turned on and has completed its self–test routine (assuming it does one), it will send a signal to the PC by asserting this line. INTERFACE EXAMPLE – A PRINTER ON THE IBM PC SERIAL PORT The RS-232 standard defines 22 serial interface signals. These signals consist of ground lines, timing, data, control and test signals, plus a set of signals rarely used for a second data channel. Many of these signal lines are not used in typical RS-232 applications; in fact, the IBM® PC serial port is implemented using only nine pins. Request To Send (RTS) The computer activates this line to notify the peripheral device that it is ready to send data. In this example, the computer notifies the modem that it is ready to send data to be transmitted by the modem. Clear To Send (CTS) This is the line on which the peripheral device tells the computer that it is ready to receive data from the computer. If the modem was not ready, i.e. it was performing a loop–back self–test, for example, it would not assert this line. Once the modem was ready to receive data from the PC, it would assert this line. When it receives the CTS signal from the modem, the PC knows that a data transmission path has been established between itself and the modem. For example, consider the case of a PC using this nine pin port to communicate with a peripheral device such as a printer. We see the following activity on each of the RS-232 lines as the computer and printer are activated and communicate. Signal Ground (GND) The Signal Ground pin acts as a reference for all the other signals. This pin is simply maintained at a 0V level to serve as a level to which all other signals are referenced. Both the PC and the printer will have this line connected to their respective internal ground lines. Transmitted Data (TD or TX) This is the pin on which the computer sends the actual data signal to be transmitted, i.e. a positive voltage (+3V to +15V) to represent a logic “0”, and a negative voltage (–3V to –15V) to represent a logic “1”. The PC would send the data on this line to be transmitted by the modem. Data Terminal Ready (DTR) This is the pin the computer uses to tell peripheral devices that it is on–line and ready to communi- Ring Indicator (RI) This line is used by the peripheral device to tell the computer that a remote device wants to start communicating. The modem would activate the RI line to tell the computer that the remote modem was calling, i.e. the phone is ringing. 7 Signal Ground Data Set Ready R Clear To Send R Ready To Send D Transmitted Data (To Be Printed) D Signal Ground 6 5 4 2 SP231A/232A Data Carrier Detect (DCD) This line is used by the modem to tell the computer that it has completed a transmission Data Set Ready D Clear To Send R Ready To Send R Received Data (To Be Printed) SP231A/232A r pute Com D Prin ter IBM Printer Port Interconnections Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 11 © Copyright 2004 Sipex Corporation Received Data (RD or RX) This is the pin on which the computer receives the incoming data signal, i.e. a positive voltage (+3V to +15V) to represent a logic “0”, and a negative voltage (-3V to -15V) to represent a logic “1”. Again, in this instance, since the printer will not be sending the PC any data, this line is not needed. cate. Once the computer is powered–up and ready, it will send out a signal on the DTR to inform the printer that it is powered–up and ready to go. The printer really doesn’t care, since it will simply print data as it is received. Accordingly, this pin is not needed at the printer. Data Set Ready (DSR) Peripheral devices use this line to tell the computer that they are on–line and ready to communicate. When the printer is turned on and has completed its self–test routine (assuming it does one), it will send a signal to the PC by asserting this line. Request To Send (RTS) The computer activates this line to notify the peripheral device that it is ready to send data. In this example, the computer notifies the printer that it is ready to send data to be printed by the printer. Clear To Send (CTS) This is the line on which the peripheral device tells the computer that it is ready to receive data from the computer. If the printer was not ready, i.e. it was out of paper, for example, it would not assert this line. Once the printer was ready to receive data from the PC, it would assert this line. When it receives the CTS signal from the printer, the PC knows that a data transmission path has been established between itself and the printer. Transmitted Data (TD or TX) This is the pin on which the computer sends the actual data signal representing the actual information to be printed, i.e. a positive voltage (+3V to +15V) to represent a logic “0”, and a negative voltage (-3V to -15V) to represent a logic “1”. Ring Indicator (RI) This line is used by the peripheral device to tell the computer that a remote device wants to start communicating. A modem would activate the RI line to tell the computer that a remote modem was calling, i.e. the phone is ringing. In the case of a printer, this line is unused. Data Carrier Detect (DCD) This line is used by a peripheral device to tell the computer to expect to start receiving data at any time. Since the printer would not be sending data to the PC in this case this line is not needed. Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 12 © Copyright 2004 Sipex Corporation TYPICAL CIRCUITS +5V INPUT 7 C 2+ 12 C 1- C 2- +5V INPUT 1–10µF CC +5V to +10V Voltage Doubler V+ +10V to -10V Voltage Inverter V- 9 + 6.3V 13 + 1–10µF 400k Ω 5 T 1 IN T1 2 T2 3 6 7 16V T1 OUT 1–10µF + 6.3V 9 10 C + 1–10µF + 16V C 2+ 11 C 1- C 2- 14 1 T3 T3 OUT 400k Ω 15 T4 IN 20 T4 T4 OUT T1 IN TTL/CMOS INPUTS T 2OUT 400k Ω T3 IN 400k Ω 19 T5 IN 16 T5 18 NC T5 OUT 17 T2 IN T5 IN R 1 OUT 1 T2 2 T3 16 T4 15 T3 IN 13 T4 IN 14 12 12 V CC 7 400k Ω T2 4 15 400k Ω T3 2 16 400k Ω T4 1 22 400k Ω T5 19 10 R1 T1 OUT T1 IN T2 OUT T2 IN TTL/CMOS INPUTS 3 T3 OUT T3 IN T4 IN T4 OUT T5 IN T5 OUT R 1 OUT R 1 IN 8 400k Ω T1 3 7 400k Ω T2 4 15 400k Ω T3 2 16 400k Ω T4 1 22 400k Ω T5 19 9 10 R1 R 2 IN 24 R3 R 3 IN 18 R4 TTL/CMOS OUTPUTS 5 R2 R 4 IN R 2 OUT 6 5 R2 EN 14 GND 5k Ω R 3 OUT T3 OUT T4 OUT T5 OUT R 1 IN R 2 IN 23 24 R3 R 3 IN 5k Ω R 4 OUT 21 R 5 OUT R 5 IN EN SD 17 18 R4 R 4 IN 14 13 R5 20 GND 5k Ω 21 R 5 IN SD 11 11 235A Date: 8/3/04 T2 OUT 5k Ω 13 R5 20 T1 OUT 5k Ω 5k Ω R 5 OUT T4 OUT 5k Ω RS-232 INPUTS TTL/CMOS OUTPUTS 17 T3 OUT 400k Ω V CC 5k Ω R 4 OUT T2 OUT +5V INPUT T1 23 T1 OUT SD 5k Ω R 3 OUT 16V 234A 400k Ω 6 + 1–10µF T1 5k Ω R 2 OUT 12 GND 5 8 9 V- 400k Ω RS-232 OUTPUTS TTL/CMOS INPUTS T4 IN +10V to -10V Voltage Inverter 3 +5V INPUT T3 IN + 6.3V 400k Ω 230A T2 IN +5V to +10V Voltage Doubler V+ 4 GND 6 T1 IN 1–10µF 8 CC 400k Ω 4 RS-232 OUTPUTS TTL/CMOS INPUTS 400k Ω T2 IN V 1 RS-232 OUTPUTS 1–10µF + 16V V 1 RS-232 OUTPUTS C + RS-232 INPUTS 8 1–10µF + 6.3V 10 11 235B + 5V Powered Multi-Channel RS-232 Drivers/Receivers 13 © Copyright 2004 Sipex Corporation TYPICAL CIRCUITS +5V INPUT V+ C 1- 1–10µF + 16V C 2+ 16V +10V to -10V Voltage Inverter V- T1 2 T1 OUT T1 IN 6 400k Ω T2 3 18 400k Ω T3 1 19 400k Ω T4 24 4 R1 T2 OUT T3 OUT 22 23 R2 T4 IN R 1 IN R 1 OUT R 2 IN 5k Ω R 3 OUT EN 17 16 R3 20 21 5k Ω T3 IN T4 OUT 5k Ω R 2 OUT T2 IN R 3 IN 14 C 2- 2 6 400k Ω T2 3 18 400k Ω T3 1 19 400k Ω T4 24 5 R 2 OUT R 3 OUT EN 22 17 T4 IN TTL/CMOS OUTPUTS T5 IN R 1 OUT +5V to +10V Voltage Doubler V+ +10V to -10V Voltage Inverter V- 11 15 400k Ω T1 2 6 400k Ω T2 3 18 400k Ω T3 1 19 400k Ω T4 24 21 400k Ω T5 20 22 17 4 R1 C + 1–10µF + 16V C 2+ 16V T1 OUT T1 IN + 1–10µF T2 OUT T3 OUT 23 R2 16 R3 T3 IN T4 IN T4 OUT R 1 OUT T5 OUT R 1 IN R 2 IN T2 IN SD R 2 OUT C 1- C 2- 1–10µF CC +5V to +10V Voltage Doubler V+ +10V to -10V Voltage Inverter V- 11 + 6.3V 15 + 1–10µF 16V 5 400k Ω T1 2 18 400k Ω T2 1 19 400k Ω T3 24 21 400k Ω T4 20 6 7 R1 T1 OUT T2 OUT T3 OUT T4 OUT R 1 IN 4 3 R2 R 2 IN 5k Ω R 3 OUT 22 23 R3 R 3 IN 5k Ω R 4 OUT R 3 IN 14 V 1 5k Ω 17 16 R4 R 4 IN 5k Ω 5k Ω GND GND 8 8 237A Date: 8/3/04 R 3 IN 9 1–10µF + 6.3V 12 13 + 6.3V 5k Ω R 3 OUT 21 5k Ω 10 1–10µF V CC 5k Ω R 2 OUT R 2 IN +5V INPUT 7 5 T4 OUT 236B TTL/CMOS INPUTS T3 IN 16 R3 20 8 TTL/CMOS OUTPUTS T2 IN T3 OUT R 1 IN 23 R2 GND RS-232 OUTPUTS TTL/CMOS INPUTS T1 IN C 2- T2 OUT 5k Ω SD RS-232 INPUTS C 2+ 14 C 1- T1 OUT 5k Ω 9 1–10µF + 16V 4 R1 8 1 16V T1 +5V INPUT C + + 1–10µF 400k Ω GND 10 15 7 236A 1–10µF + 6.3V 12 13 + 6.3V RS-232 OUTPUTS 5 + 1–10µF 1–10µF 11 RS-232 OUTPUTS 15 1 RS-232 INPUTS TTL/CMOS OUTPUTS V- 400k Ω R 1 OUT 9 V CC +5V to +10V Voltage Doubler + 6.3V TTL/CMOS INPUTS TTL/CMOS INPUTS T4 IN +10V to -10V Voltage Inverter 7 T2 IN T3 IN C 2- 11 TTL/CMOS OUTPUTS C 2+ C 1- +5V to +10V Voltage Doubler V+ RS-232 OUTPUTS 1–10µF + 16V T1 IN C + 10 1–10µF V CC 1 RS-232 INPUTS C + 14 1–10µF + 6.3V 12 13 9 10 1–10µF + 6.3V 12 13 RS-232 INPUTS +5V INPUT 238A + 5V Powered Multi-Channel RS-232 Drivers/Receivers 14 © Copyright 2004 Sipex Corporation TYPICAL CIRCUITS +5V INPUT 19 + 28 4.7µF 16V T1 IN TTL/CMOS INPUTS T2 IN T3 IN T4 IN T5 IN 29 C1 – C2 + +10V to -10V Voltage Inverter V+ 26 10µF 6.3V V- 10µF 16V 30 C2 – 15 400k T1 7 14 400k Ω T2 8 37 400k Ω T3 6 38 400k Ω T4 5 2 400k Ω T5 41 T1 OUT T2 OUT RS-232 OUTPUTS 27 +5V to +10V Voltage Doubler + 4.7µF 6.3V VCC C1 + + + 25 T3 OUT T4 OUT T5 OUT SP240A/B R 1 OUT 16 17 R1 R 1 IN 5kΩ 13 R2 R 2 IN RS-232 INPUTS TTL/CMOS OUTPUTS R 2 OUT 10 5kΩ R 3 OUT 3 4 R3 R 3 IN 5kΩ R 4 OUT 39 40 R4 R 4 IN 5kΩ R 5 OUT 36 35 R5 R 5 IN 5kΩ EN 43 42 SD GND 18 240A/B +5V INPUT 11 V CC V+ C 1- +5V to +10V Voltage Doubler 1–10µF + 16V C 2+ +10V to -10V Voltage Inverter V- T3 IN T4 IN R 1 OUT 17 400k Ω T1 2 6 400k Ω T2 3 20 400k Ω T3 1 21 400k Ω T4 28 9 R1 + 1–10µF 16V 7 8 + 6.3V C + 11 V CC V+ C 1- +5V to +10V Voltage Doubler 1–10µF + 16V C 2+ +10V to -10V Voltage Inverter V- T1 IN T1 OUT TTL/CMOS INPUTS T2 IN C 2- 1–10µF 13 RS-232 OUTPUTS TTL/CMOS INPUTS T1 IN 16 1 T2 OUT T3 OUT T2 IN T3 IN T4 IN T4 OUT R 1 OUT R 1 IN 16 1 C 2- R 2 IN 5k Ω R 3 OUT 26 27 R3 R 3 IN 5k Ω R 4 OUT 22 23 R4 TTL/CMOS OUTPUTS 4 R2 R 4 IN R 2 OUT EN 19 GND 5k Ω R 3 OUT 400k Ω T1 2 6 400k Ω T2 3 20 400k Ω T3 1 21 400k Ω T4 28 8 9 R1 T1 OUT T2 OUT T3 OUT T4 OUT R 1 IN 5 4 R2 R 2 IN 26 27 R3 R 3 IN 5k Ω R 4 OUT 25 R 5 OUT R 5 IN EN SD 22 23 R4 R 4 IN 19 18 R5 24 GND 5k Ω 25 R 5 IN SD 10 10 241A Date: 8/3/04 16V 5k Ω 18 R5 24 + 1–10µF 5k Ω 5k Ω R 5 OUT 17 5k Ω RS-232 INPUTS TTL/CMOS OUTPUTS 5 + 6.3V 7 5k Ω R 2 OUT 1–10µF 13 RS-232 INPUTS C + 12 1–10µF + 6.3V 14 15 12 1–10µF + 6.3V 14 15 RS-232 OUTPUTS +5V INPUT 241B + 5V Powered Multi-Channel RS-232 Drivers/Receivers 15 © Copyright 2004 Sipex Corporation ORDERING INFORMATION Model ....................................................................................... Temperature Range .................................................................... Package SP230ACP ..................................................................................... 0°C to +70°C ............................................................................... 20 pin PDIP SP230ACT ..................................................................................... 0°C to +70°C ............................................................................ 20 pin WSOIC SP230ACT/TR ............................................................................... 0°C to +70°C ............................................................................ 20 pin WSOIC SP230ACX ..................................................................................... 0°C to +70°C ............................................................................................ Dice SP230AEP ................................................................................... –40°C to +85°C ............................................................................. 20 pin PDIP SP230AET ................................................................................... –40°C to +85°C .......................................................................... 20 pin WSOIC SP230AET/TR ............................................................................. –40°C to +85°C .......................................................................... 20 pin WSOIC SP234ACP ..................................................................................... 0°C to +70°C ............................................................................... 16 pin PDIP SP234ACT ..................................................................................... 0°C to +70°C ............................................................................ 16 pin WSOIC SP234ACT/TR ............................................................................... 0°C to +70°C ............................................................................ 16 pin WSOIC SP234ACX ..................................................................................... 0°C to +70°C ............................................................................................ Dice SP234AEP ................................................................................... –40°C to +85°C ............................................................................. 16 pin PDIP SP234AET ................................................................................... –40°C to +85°C .......................................................................... 16 pin WSOIC SP234AET/TR ............................................................................. –40°C to +85°C .......................................................................... 16 pin WSOIC SP235ACP ..................................................................................... 0°C to +70°C ............................................................................... 24 pin PDIP SP235AEP ................................................................................... –40°C to +85°C ............................................................................. 24 pin PDIP SP235BCP ..................................................................................... 0°C to +70°C ............................................................................... 24 pin PDIP SP235BEP ................................................................................... –40°C to +85°C ............................................................................. 24 pin PDIP SP236ACS ..................................................................................... 0°C to +70°C ............................................................................... 24 pin PDIP SP236ACT ..................................................................................... 0°C to +70°C ............................................................................ 24 pin WSOIC SP236ACT/TR ............................................................................... 0°C to +70°C ............................................................................ 24 pin WSOIC SP236ACX ..................................................................................... 0°C to +70°C ............................................................................................ Dice SP236AES ................................................................................... –40°C to +85°C ............................................................................. 24 pin PDIP SP236AET ................................................................................... –40°C to +85°C .......................................................................... 24 pin WSOIC SP236AET/TR ............................................................................. –40°C to +85°C .......................................................................... 24 pin WSOIC SP236BCS ..................................................................................... 0°C to +70°C .............................................................................. 24 pin PDIP SP236BCT ..................................................................................... 0°C to +70°C ............................................................................ 24 pin WSOIC SP236BCT /TR .............................................................................. 0°C to +70°C ............................................................................ 24 pin WSOIC SP236BCX ..................................................................................... 0°C to +70°C ............................................................................................ Dice SP236BES ................................................................................... –40°C to +85°C ............................................................................. 24 pin PDIP SP236BET ................................................................................... –40°C to +85°C .......................................................................... 24 pin WSOIC SP236BET /TR ............................................................................ –40°C to +85°C .......................................................................... 24 pin WSOIC SP237ACS ..................................................................................... 0°C to +70°C ............................................................................... 24 pin PDIP SP237ACT ..................................................................................... 0°C to +70°C ............................................................................ 24 pin WSOIC SP237ACT/TR ............................................................................... 0°C to +70°C ............................................................................ 24 pin WSOIC SP237ACX ..................................................................................... 0°C to +70°C ............................................................................................ Dice SP237AES ................................................................................... –40°C to +85°C ............................................................................. 24 pin PDIP SP237AET ................................................................................... –40°C to +85°C .......................................................................... 24 pin WSOIC SP237AET/TR ............................................................................. –40°C to +85°C .......................................................................... 24 pin WSOIC Please consult factory for SP235B, SP236B, SP240B, SP241B, and dice. Available in lead free packaging. To order add "-L" suffix to part number. Example: SP230AEP = standard; SP230AEP-L = lead free /TR = Tape and Reel Pack quantity is 1,500 for WSOIC. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 16 © Copyright 2004 Sipex Corporation ORDERING INFORMATION SP238ACS ..................................................................................... 0°C to +70°C ............................................................................... 24 pin PDIP SP238ACT ..................................................................................... 0°C to +70°C ............................................................................ 24 pin WSOIC SP238ACT/TR ............................................................................... 0°C to +70°C ............................................................................ 24 pin WSOIC SP238ACX ..................................................................................... 0°C to +70°C ............................................................................................ Dice SP238AES ................................................................................... –40°C to +85°C ............................................................................. 24 pin PDIP SP238AET ................................................................................... –40°C to +85°C .......................................................................... 24 pin WSOIC SP238AET/TR ............................................................................. –40°C to +85°C .......................................................................... 24 pin WSOIC SP240ACF ..................................................................................... 0°C to +70°C ................................................................ 44 pin Quad Flatpack SP240BCF ..................................................................................... 0°C to +70°C ............................................................... 44 pin Quad Flatpack SP241ACT ..................................................................................... 0°C to +70°C ............................................................................ 28 pin WSOIC SP241ACT/TR ............................................................................... 0°C to +70°C ............................................................................ 28 pin WSOIC SP241AET ................................................................................... –40°C to +85°C .......................................................................... 28 pin WSOIC SP241AET/TR ............................................................................. –40°C to +85°C .......................................................................... 28 pin WSOIC SP241BCT ..................................................................................... 0°C to +70°C ............................................................................ 28 pin WSOIC SP241BCT/TR ............................................................................... 0°C to +70°C ............................................................................ 28 pin WSOIC SP241BET ................................................................................... –40°C to +85°C .......................................................................... 28 pin WSOIC SP241BET/TR ............................................................................. –40°C to +85°C .......................................................................... 28 pin WSOIC Available in lead free packaging. To order add "-L" suffix to part number. Example: SP230AET/TR = standard; SP230AET-L/TR = lead free /TR = Tape and Reel Pack quantity is 1,500 for WSOIC. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers 17 © Copyright 2004 Sipex Corporation