ST232A
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ELECTRICAL CHARACTERISTICS
(C1 - C4 = 0.1µF, VCC = 5V ± 10%, TA = -40 to 85°C, unl ess otherwise specified.
Typical values are referred to TA = 25°C)
TRANSMITTER ELECTRICAL CHARACTE RIST ICS
(C1 - C4 = 0.1µF, VCC = 5V ± 10%, TA = -40 to 85°C, unle ss otherwise specified.
Typical values are referred to TA = 25°C)
Note 1: Measured from 3V to -3V or from -3V to 3V.
Note2: On e trasmitter output is loaded with R L = 3KΩ to 7KΩ, CL = 50 to 1000 pF
RECEIVER ELECTRICAL CHARA CTERISTICS
(C1 - C4 = 0.1µF, VCC = 5V ± 10%, TA = -40 to 85°C, unl ess 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
VTOUT Output Voltage Swing All Transmitter outputs are loaded with
3KΩ to GND ± 5± 9V
I
TIL Logic Pull-Up Current TIN = 0V 5 40 µA
VTIL 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
RL = 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 VOUT = ± 2V 300 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°C 3 5 7 KΩ
VRIL 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 V oltage
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