ST232A
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ELECTRICAL CHARACTERISTICS
(C1-C
4= 0.1µF, VCC =5V± 10%, TA= -40 to 85°C, unless otherwise specified.
Typical values are referred to TA=25°C)
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C1-C
4= 0.1µF, VCC =5V± 10%, TA= -40 to 85°C, unless otherwise specified.
Typical values are referred to TA=25°C)
Note 1: Measured from 3V to -3V or from -3V to 3V.
Note2: One trasmitter output is loaded with RL=3KΩto 7KΩ,C
L= 50 to 1000pF
RECEIVER ELECTRICAL CHARACTERISTICS
(C1-C
4= 0.1µF, VCC =5V± 10%, TA= -40 to 85°C, unless otherwise specified.
Typical values are referred to TA=25°C)
Note 1: RS-232 IN to TTL-CMOS OUT (from 50% to 50%)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
ISUPPLY VCC Power Supply Current No Load 1.5 4 mA
Symbol Parameter Test Conditions Min. Typ. Max. Unit
TTOUT Output Voltage Swing All Transmitter outputs are loaded with
3KΩto GND ± 5± 9V
I
TIL Logic Pull-Up Current TIN =0V 5 40 µA
V
TIL Input Logic Threshold Low 0.8 1.4 V
VTIH Input Logic Threshold High 1.4 2 V
SRTTransition Slew Rate TA=25°C, VCC =5V
R
L= 3 to 7KΩ,C
L
= 50 to 2500pF
(Note1)
61230V/µs
D
R
Data Rate (Note 2) 200 400 Kbits/s
RTOUT Transmitter Output
Resistance VCC =V+=V-=0V V
OUT =±2V 300 10M Ω
ISC Transmitter Output Short
Circuit Current one TXOUT to GND ± 7± 22 mA
tdT Propagation Delay Time TTL-CMOS IN to RS-232 OUT
CL= 150pF (50% to 50%) 1.3 3.5 µs
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VRIN Receiver Input Voltage
Operating Range -30 30 V
RRIN RS-232 Input Resistance TA=25°C357KΩ
V
RIL RS-232 Input Threshold
Low 0.8 1.3 V
VRIH RS-232 Input Threshold
High 1.8 2.4 V
VRIHYS RS-232 Input Hysteresis VCC = 5V 0.2 0.5 1 V
VROL TTL/CMOS Output Voltage
Low IOUT = 3.2mA (to VCC) 0.2 0.4 V
VROH TTL/CMOS Output Voltage
High IOUT = 1mA (to GND) 3.5 VCC-0.2 V
ISCR Receiver Output Short
Circuit Current to GND
to VCC 2
10 10
30 mA
mA
tdR Propagation Delay Time CL= 150pF (Note 1) 0.1 0.5 µs