ST232
ELECTRICAL CHARACTERISTICS
(C
1
-C
4
= 0.1µF, V
CC
= 5V
±
10% T
A
= -40 to 85
o
C, unless otherwise specified.
Typical Valus are referred to T
A
= 25
o
C)
Symb ol
Parameter
T est Cond it ion s
Min.
I
SUPPLY
V
CC
Power Supply Current
No Load,
T
A
= 25 C
o
Value
T yp.
5
Max.
10
Un it
mA
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C
1
-C
4
= 0.1µF, V
CC
= 5V
±
10%, T
A
= -40 to 85
o
C, unless otherwise specified.
Typical Valus are referred to T
A
= 25
o
C)
Symb ol
V
TOUT
I
TIL
V
TIL
V
TIH
SR
T
Parameter
Output Voltage Swing
Logic Pull-Up Current
Input Logic Threshold Low
Input Logic Threshold High
Transition Slew Rate
T
A
= 25 C, V
CC
= 5 V,
R
L
= 3 to 7 KΩ,
C
L
= 50 to 2500 pF (Note 1)
(Note 2)
V
CC
= V+ = V- = 0V
V
OUT
=
±
2 V
one T
XOUT
to GND
120
300
±10
±60
o
T est Cond it ion s
Min.
All Transmitter outputs are
loaded with 3K
Ω
to GND
T
IN
= 0 V
2
±5
Value
T yp.
±7.8
15
200
0.8
7
30
Max.
Un it
V
µ
A
V
V
V/
µ
s
D
R
R
TOUT
I
SC
Data Rate
Transmitter Output Resistance
Transmitter Output Short Circuit
Current
220
Kbits/s
Ω
mA
Note 1: Measured from 3V to -3Vor from -3V to 3V.
Note 2: One trasmitter output is loaded with R
L
= 3K
Ω
to7K
Ω
, C
L
= 50 to 1000pF
RECEIVER ELECTRICAL CHARACTERISTICS
(C
1
-C
4
= 0.1µF, V
CC
= 5V
±
10%, T
A
= -40 to 85
o
C, unless otherwise specified.
Typical Valus are referred to T
A
= 25
o
C)
Symb ol
V
RIN
R
RIN
V
RIL
V
RIH
V
RIHYS
V
ROL
V
ROH
t
dR
I
SCR
Parameter
Receiver Input Voltage Operating
Range
RS-232 Input Resistance
RS-232 Input Logic Threshold Low
RS-232 Input Logic Threshold High
RS-232 Input Hysteresis
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High
Propagation Delay Time
Receiver Output Short Circuit Current
T
A
= 25
o
C, V
CC
= 5 V,
V
RIN
= 5 V
T
A
= 25
o
C, V
CC
= 5 V
T
A
= 25 C, V
CC
= 5 V
V
CC
= 5 V
I
OUT
= 3.2mA (to V
CC
)
I
OUT
= 1mA (to GND)
C
L
=150pF (Note 1)
3.5
V
CC
-0.4
0.3
±
10
1
0.2
o
T est Cond it ion s
Min.
-30
3
0.8
Value
T yp.
Max.
30
5
1.2
1.7
0.5
2.4
1
0.4
7
Un it
V
K
Ω
V
V
V
V
V
µ
s
mA
Note 1: RS-232 IN to TTL-CMOS OUT (from 50% to 50%)
3/11
STMICROELECTRONICS [ STMICROELECTRONICS ]
