Document
SP232A
Enhanced RS-232 Line Drivers/Receivers
FEATURES • Operates from a Single +5V Power Supply • Meets all RS-232F and ITU V.28 Specifications • Operates with 0.1μF Ceramic Capacitors • High Data rate - 120kbps under load • Low power CMOS Operation • +/-2kV Human Body Model ESD Protection • Lead Free packaging available
DESCRIPTION The SP232A is a line driver and receiver pair that meets the specifications of RS-232 and V.28 serial protocols. This device is pin-to-pin compatible with popular industry standard pinouts. The SP232A offers 120kbps data rate under load, small ceramic type 0.1μF charge pump capacitors and overall ruggedness for comercial applications. The SP232A features Exar's BiCMOS design allowing for low power operation without sacrificing performance. This device is avaialble in plastic DIP, SOICW and nSOIC packages operating over the commercial and industrial temperature ranges.
SOICW and nSOIC versions available, PDIP versions are obsolete.
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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 are not implied. Exposure to absolute maximum ratings conditions for extended periods of time may affect reliability.
Supply Voltage (VCC)...............................................+ 6V V+........................................................................... (Vcc-0.3V) to +11.0V V- .............................................................................-11.0V Input Voltages Tin.....................................................-0.3V to (Vcc + 0.3V) Rin............................................................................+/-15V Output Voltages Tout...............................................(V+, +0.3V) to (V-, -0.3V Rout...................................................-0.3V to (Vcc + 0.3V)
ABSOLUTE MAXIMUM RATINGS
Short Circuit duration Tout.....................................................Continuous Package Power Dissipation: Plastic DIP...............................................375mW (derate 7mW/°C above +70°C) Small Outline...........................................375mW (derate 7mW/°C above +70°C) Storage Temperature..................-65°C to +150°C Lead Temperature (soldering, 10s).......... +300°C
ELECTRICAL CHARACTERISTICS
Vcc=5V ±10%, 0.1μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
TTL INPUT
Logic Threshold LOW
TIN
0.8
Volts
Logic Threshold HIGH
TIN
2.0
Volts
Logic Pull-Up Current
TIN = 0V
15
200
μA
TTL OUTPUT
Output Voltge LOW
Iout = 3.2 mA: Vcc = +5V
0.4
Volts
Output Voltage HIGH
Iout = -1.0 mA
3.5
Volts
RS-232 OUTPUT
Output Voltage Swing
All Transmitter outputs loaded with 3k ohms to GND
+/-5.0 +/-6.5V
Volts
Output Resistance
Vcc = 0V, Vout = +/-2V
300
Ohms
Output Short Circuit Current
Infinite Duration
+/-18
mA
Maximum Data Rate
CL = 2500pF, RL = 3kΩ
120
240
kbps
RS-232 INPUT
Voltage Range
-15
+15
Volts
Voltage Threshold LOW
Vcc = 5V, Ta=25°C
0.8
1.2
Volts
Voltage Threshold HIGH
Vcc = 5V, Ta=25°C
1.7
2.4
Volts
Hysteresis
Vcc = 5V, Ta=25°C
0.2
0.5
1.0
Volts
Resistance
Ta=25°C, -15V ≤ Vin ≤ +15V
3
5
7
kΩ
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ELECTRICAL CHARACTERISTICS
Vcc=5V ±10%, 0.1μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25°C
DYNAMIC CHARACTERISTICS
Driver Propagation Delay
TTL to RS_232; CL = 50pF
1.5
3.0
μs
Receiver Propagation Delay
RS-232 to TTL,
0.1
1.0
μs
Instantaneous Slew Rate
CL = 10pF, RL = 3-7kΩ
30
V/ μs
Transition Region Slew Rate
CL = 2500pF, RL = 3kΩ; Measured from +3V to -3V or -3V to +3V
10
V/ μs
POWER REQUIREMENTS Vcc Power Supply Current
No Load, Vcc = 5V, Ta=25°C
1.5
5
mA
Vcc Power Supply Current, Loaded
All Transmitters RL = 3kΩ, Ta=25°C
11
mA
Pin Number Pin Name
PIN ASSIGNMENTS Pin Function
1
C1+
Positive terminal of the voltage doubler charge pump capacitor
2
V+
+6.5V generated by the charge pump
3
C1-
Negative terminal of the voltage doubler charge pump capacitor
4
C2+ Positive terminal of the inverting charge pump capacitor
5
C2-
Negative terminal of the inverting charge pump capacitor
6
V-
-6.7V generated by the charge pump
7
T2OUT RS-232 driver output
8
R2IN RS-232 receiver input
9
R2OUT TTL/CMOS receiver output
10
T2IN TTL/CMOS driver input
11
T1IN TTL/CMOS driver input
12
R1OUT TTL/CMOS receiver output
13
R1IN RS-232 receiver input
14
T1OUT RS-232 driver output
15
GND Ground
16
Vcc
5V supply voltage
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DETAILED DESCRIPTION
The SP232A transceiver is a two driver and two receiver device that meets the EIA/TIA- 232 and V.28 serial communication protocol. The device is pin-to-pin compatible with popular industry standard pinouts. The SP232A of.