SP385A SIPEX | Alldatasheet
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SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation SP385A +3V to +5V RS-232 Line Driver/Receiver n Operates from 3.3V or 5V Power Supply n Meets All EIA-232D and V.28 Specifica- tions at 5V n Meets EIA-562 Specifications at 3.3V n Two Drivers and Receivers n Operates with 0.1µF to 10µF Capacitors n High Data Rate — 120kbps Under Load n Low Power Shutdown ≤1µA n 3-State TTL/CMOS Receiver Outputs n Low Power CMOS — 5mA Operation DESCRIPTION… The Sipex SP385A is an enhanced version of the Sipex SP200 family of RS232 line drivers/ receivers. The SP385A offers +3.3V operation for EIA-562 and EIA-232 applications. The SP385A maintains the same performance features offered in its predecessors. The SP385A is available in plastic SOIC or SSOP packages operating over the commercial and industrial temperature ranges. The SP385A is pin compatible to the LTC1385 EIA-562 transceiver, except the drivers in the SP385A can only be disabled with the ON/OFF pin. R2R1 T2T1 TTL/CMOS INPUTS RS232 OUTPUTS TTL/CMOS OUTPUTS RS232 INPUTS CHARGE PUMP
SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation 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. V Input Voltages Output Voltages Short Circuit Duration Power Dissipation (derate 9.5mW/°C above +70°C) (derate 7mW/°C above +70°C) (derate 7mW/°C above +70°C) SPECIFICATIONS VCC =+3.3V±10%; 0.1µF charge pump capacitors; TMIN to TMAX unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS TTL INPUT Logic Threshold Low 0.8 Volts T IN ; ON/OFF Vcc = 3.3V High 2.0 Volts T IN ; ON/OFF Vcc = 3.3V Logic Pullup Current 15 200 µAT IN = 0V Maximum Data Rate 120 kbps C L = 2500pF, RL= 3kΩ TTL OUTPUT TTL/CMOS Output Voltage, Low 0.5 Volts I OUT = 3.2mA; Vcc = 3.3V Voltage, High 2.4 Volts I OUT = -1.0mA Leakage Current; TA = +25°C 0.05 ±10 µA ON/OFF=0V , 0V ≤ VOUT ≤ VCC EIA-562 OUTPUT Output Voltage Swing ±3.7 ±4.2 Volts All transmitter outputs loaded with 3kΩ to ground Power-Off Output Resistance 300 Ω VCC = 0V; VOUT = ±2V Output Short Circuit Current ±10 mA Infinite duration EIA-562 INPUT Voltage Range -15 +15 Volts Voltage Threshold Low 0.8 1.2 Volts V CC = 3.3V, TA = +25°C High 1.7 2.4 Volts V CC = 3.3V, TA = +25°C Hysteresis 0.2 0.5 1.0 Volts V CC = 3.3V, TA = +25°C Resistance 3 5 7 k Ω VIN = 15V to –15V DYNAMIC CHARACTERISTICS Driver Propagation Delay 4.0 µs TTL to RS-562 Receiver Propagation Delay 1.5 µs RS-562 to TTL Instantaneous Slew Rate 30 V/ µsC L = 10pF, RL= 3kΩ - 7kΩ ; TA = +25°C Transition Region Slew Rate 10 V/ µsC L = 2500pF, RL= 3kΩ ; measured from +2V to -2V or -2V to +2V Output Enable Time 300 ns Output Disable Time 1000 ns POWER REQUIREMENTS VCC Power Supply Current 3 6 mA No load, TA= +25°C; VCC = 3.3V 8 mA All transmitters R L = 3kΩ TA = +25°C Shutdown Supply Current 0.010 5 µAV CC = 3.3V, TA = +25°C
SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation PERFORMANCE CURVES -55 -40 0 25 70 85 125 Temperature (°C) VCC = 6V VCC = 5V VCC = 4V VCC = 3V ICC (mA) VCC (Volts) 6.8 7.4 7.6 7.8 8.0 8.2 8.4 Load current = 0mA TA = 25°C VOH (Volts) 7.0 7.2 0 5 10 15 20 Load Current (mA) V+ (Volts) V CC = 5V VCC = 4V VCC = 6V 25 30 35 400246 8 1 0 1 2 1 4 Load Current (mA) V– Voltage (Volts) -10 -11 V CC = 6V VCC = 5V VCC = 4V SPECIFICATIONS VCC =+5V ±10%; 0.1µF charge pump capacitors; TMIN to TMAX unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS TTL INPUT Logic Threshold Low 0.8 Volts T IN ; ON/OFF High 2.0 Volts T IN ; ON/OFF Logic Pullup Current 15 200 µAT IN = 0V Maximum Data Rate 120 kbps C L = 2500pF, RL= 3kΩ TTL OUTPUT TTL/CMOS Output Voltage, Low 0.4 Volts I OUT = 3.2mA; Vcc = +5V Voltage, High 3.5 Volts I OUT = -1.0mA Leakage Current; TA = +25°C 0.05 ±10 µA ON/OFF = O, 0V ≤ VOUT ≤ VCC EIA-232 OUTPUT Output Voltage Swing ±5 ±9 Volts All transmitter outputs loaded with 3kΩ to ground Power-Off Output Resistance 300 Ω VCC = 0V; VOUT = ±2V Output Short Circuit Current ±18 mA Infinite duration EIA-232 INPUT Voltage Range -15 +15 Volts Voltage Threshold Low 0.8 1.2 Volts V CC = 5V, TA = +25°C High 1.7 2.4 Volts V CC = 5V, TA = +25°C Hysteresis 0.2 0.5 1.0 Volts V CC = 5V, TA = +25°C Resistance 3 5 7 k Ω VIN = 15V to –15V DYNAMIC CHARACTERISTICS Driver Propagation Delay 4.0 µs TTL to RS-232 Receiver Propagation Delay 1.5 µs RS-232 to TTL Instantaneous Slew Rate 30 V/ µsC L = 10pF, RL= 3kΩ - 7kΩ ; TA =+25°C Transition Region Slew Rate 10 V/ µsC L = 2500pF, RL= 3kΩ ; measured from +3V to -3V or -3V to +3V Output Enable Time 400 ns Output Disable Time 250 ns POWER REQUIREMENTS VCC Power Supply Current 10 15 mA No load, TA= +25°C; VCC = 5V 25 mA All transmitters R L = 3kΩ ; TA = +25°C Shutdown Supply Current 1 10 µAV CC = 5V, TA = +25°C
SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation PINOUT… TYPICAL OPERATING CIRCUIT… ON/OFF V GND T OUT R IN R OUT T IN T IN R OUT N/C C + C - C + C - T OUT R IN 1 CC SP385A ON/OFF V GND T OUT R IN R OUT T IN T IN R OUT N/C N/C C + C - C + C - T OUT R IN N/C 1 CC SP385A 10 9 R INR OUT2 13 14 R INR OUT1 11 8T IN2 T OUT2 12 15T IN1 T OUT1 16GND 400K Ω 400K Ω TTL/CMOS INPUTS RS232 OUTPUTS C + C -1 V CC +0.1 F 6.3V µ +5V to +10V Voltage Doubler +5V INPUT TTL/CMOS OUTPUTS RS232 INPUTS 5KΩ 0.1 F 16V µ 5KΩ C + C -2 2+0.1 F 16V µ +10V to -10V Voltage Inverter 0.1 Fµ SP311A
18 ON/OFF
0.1 F 16V µ 12 9 R INR OUT2 15 16 R INR OUT1 13 8T IN2 T OUT2 14 17T IN1 T OUT1 18GND 400K Ω 400K Ω TTL/CMOS INPUTS RS232 OUTPUTS C + C -1 V CC +0.1 F 6.3V µ +5V to +10V Voltage Doubler +5V INPUT TTL/CMOS OUTPUTS RS232 INPUTS 5KΩ 0.1 F 16V µ 5KΩ C + C -2 2+0.1 F 16V µ +10V to -10V Voltage Inverter 0.1 Fµ SP311A
20 ON/OFF
0.1 F 16V µ SP385ASP385A
SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation FEATURES… The Sipex SP385A is a +3V to +5V EIA-232/EIA- 562 line transceiver. It is a pin-for-pin alternative for the SP310A and will operate in the same socket with capacitors ranging from 0.1µF to 10µF, either polar- ized or non–polarized, in +3V supplies. The SP385A offers the same features such as 120kbps guaranteed transmission rate, increased drive current for longer and more flexible cable configurations, low power dissipation and overall ruggedized construction for commercial and industrial environments. The SP385A also includes a shutdown feature that tri-states the drivers and the receivers. The SP385A includes a charge pump voltage con- verter which allows it to operate from a single +3.3V or +5V supply. These converters double the V CC voltage input in order to generate the EIA-232 or EIA- 562 output levels. For +5V operation, the SP385A driver outputs adhere to all EIA-232D and CCITT V.28 specifications. While at +3.3V operation, the outputs adhere to EIA-562 specifications. Due to Sipex's efficient charge pump design, the charge pump levels and the driver outputs are less noisy than other 3V EIA-232 transceivers. The SP385A has a single control line which simul- taneously shuts down the internal DC/DC con- verter and puts all transmitter and receiver outputs into a high impedance state. The SP385A is available in 18-pin plastic SOIC and 20-pin plastic SSOP packages for operation over commercial and industrial temperature ranges. Please consult the factory for surface- mount packaged parts supplied on tape-on-reel as well as parts screened to MIL-M-38510. The SP385A is ideal for +3.3V battery applica- tions requiring low power operation. The charge pump strength allows the drivers to provide ±4.0V signals, plenty for typical EIA-232 applications since the EIA-232 receivers have input sensitivity levels of less than ±3V. THEORY OF OPERATION The SP385A device is made up of three basic circuit blocks — 1) a driver/transmitter, 2) a receiver and 3) a charge pump. 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 for 5V supply and ±4.2V for 3.3V supply. Even under worst case loading conditions of 3kΩ and 2500pF, the output is guar- anteed to be ±5V for a 5V supply and ±3.7V for a 3.3V supply which adheres to EIA-232 and EIA- 562 specifications, respecitively. The transmitter outputs are protected against infinite short-circuits to ground without degradation in reliability. The instantaneous slew rate of the transmitter output is internally limited to a maximum of 30V/ µs in order to meet the standards [EIA 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 V OL to VOH clearly meets the monotonicity requirements of the standard [EIA 232-D 2.1.7, Paragraphs (1) & (2)]. 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. The input thresholds are 0.8V minimum and 2.4V maximum, again well within the ±3V RS-232 requirements. The receiver inputs are also pro- tected against voltages up to ±15V. Should an input be left unconnected, a 5kΩ pull-down resis- tor to ground will commit the output of the receiver to a high state. 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.
voltage doubler and 2) a voltage inverter.
- The voltage across C3 is now from
transfer charge to C4 to genrate V-. sustain charges to the two transmitters. clamp the outputs to an acceptable voltage level. transmitter outputs in a tri–state mode. Figure 1. Charge Pump Voltage Doubler Figure 2. Charge Pump Voltage Inverter
SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation D EH PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (WIDE) DIMENSIONS (Inches) Minimum/Maximum (mm) A Ø LBe A B D E e H L Ø 18–PIN 0.093/0.104 (2.352/2.649) 0.004/0.012 (0.102/0.300) 0.013/0.020 (0.330/0.508) 0.447/0.463 (11.35/11.74) 0.291/0.299 (7.402/7.600)
0.050 BSC
(1.270 BSC) 0.394/0.419 (10.00/10.64) 0.016/0.050 (0.406/1.270) 0°/8° (0°/8°)
SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation D EH PACKAGE: PLASTIC SHRINK SMALL OUTLINE (SSOP) DIMENSIONS (Inches) Minimum/Maximum (mm) 20–PIN A Ø LBe A B D E e H L Ø 0.068/0.078 (1.73/1.99) 0.002/0.008 (0.05/0.21) 0.010/0.015 (0.25/0.38) 0.278/0.289 (7.07/7.33) 0.205/0.212 (5.20/5.38)
0.026 BSC
(0.65 BSC) 0.301/0.311 (7.65/7.90) 0.022/0.037 (0.55/0.95) 0°/8° (0°/8°)
SP385ADS/05 SP385A Line Driver/Receiver © Copyright 2000 Sipex Corporation
ORDERING INFORMATION
CT and ET packages available Tape–on–Reel. Please consult the factory for pricing and availability for this option, and for parts screened to MIL–STD–883. 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. Far East: JAPAN: Nippon Sipex Corporation Yahagi No. 2 Building 3-5-3 Uchikanda, Chiyoda-ku Tokyo 101 TEL: 81.3.3256.0577 FAX: 81.3.3256.0621 Sipex Corporation Headquarters and Sales Office
22 Linnell Circle
Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office
233 South Hillview Drive
Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600