ST232A
VERY HIGH SPEED, ULTRA LOW POWER CONSUMPTION
5V POWERED RS-232 DRIVERS AND RECEIVERS
October 1999
s
SUPPLY VOLTAGE RANGE: 4.5 TO 5.5V
s
SUPPLY CURRENT NO LOAD (TYP): 1.5mA
s
TRANSMITTER OUTPUT VOLTAGESWING
(TYP):
9V
s
TRANSITION SLEW RATE (TYP.):12V/
s
s
RECEIVER PROPAGATION DELAY
(TYP.): 0.1
s
s
RECEIVER INPUT VOLTAGE RANGE:
30V
s
DATA RATE (TYP): 400Kbp/s
s
OPERATING TEMPERATURE RANGE:
-40 TO 85
o
C, 0 TO 70
o
C
DESCRIPTION
The ST232A is a 2 driver, 2 receiver device
following EIA/TIA-232 and V.28 communication
standard. It is particularly suitable for applications
where
12V is not available. The ST232 uses a
single 5V power supply and only four external
capacitors (0.1
F). Typical applications are in:
Portable
Computers,
Low
Power
Modems,
Interfaces Translation, Battery Powered RS-232
System, Multi-Drop RS-232 Networks.
D
(Micro Package)
N
(Plastic Package)
W
(Micro Package Large)
T
(TSSOP Package)
ORDER CODES
Type
T emperature
Ran ge
Packag e
Comments
ST232ACN
0 to 70
o
C
DIP-16
25 parts per tube / 40 tube per box
ST232ABN
-40 to 85
o
C
DIP-16
25 parts per tube / 40 tube per box
ST232ACD
0 to 70
o
C
SO-16 (Tube)
50 parts per tube / 20 tube per box
ST232ABD
-40 to 85
o
C
SO-16 (Tube)
50 parts per tube / 20 tube per box
ST232ACDR
0 to 70
o
C
SO-16 (Tape & Reel)
2500 parts per reel
ST232ABDR
-40 to 85
o
C
SO-16 (Tape & Reel)
2500 parts per reel
ST232ACW
0 to 70
o
C
SO-16 Large (Tube)
50 parts per tube / 20 tube per box
ST232ABW
-40 to 85
o
C
SO-16 Large (Tube)
50 parts per tube / 20 tube per box
ST232ACWR
0 to 70
o
C
SO-16 Large (Tape & Reel)
1000 parts per reel
ST232ABWR
-40 to 85
o
C
SO-16 Large (Tape & Reel)
1000 parts per reel
ST232ACTR
0 to 70
o
C
TSSOP16 (Tape & Reel)
2500 parts per reel
ST232ABTR
-40 to 85
o
C
TSSOP16 (Tape & Reel)
2500 parts per reel
1/10
PIN CONFIGURATION
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND F UNCTION
1
C
1
+
Positive Terminal for the first Charge Pump Capacitor
2
V+
Doubled Voltage Terminal
3
C
1
-
Negative Terminal for the first Charge Pump Capacitor
4
C
2
+
Positive Terminal for the second Charge Pump Capacitor
5
C
2
-
Negative Terminal for the second Charge Pump Capacitor
6
V-
Inverted Voltage Terminal
7
T2
OUT
Second Transmitter Output Voltage
8
R2
IN
Second Receiver Input Voltage
9
R2
OUT
Second Receiver Output Voltage
10
T2
IN
Second Transmitter Input Voltage
11
T1
IN
First Transmitter Input Voltage
12
R1
OUT
First Receiver Output Voltage
13
R1
IN
First Receiver Input Voltage
14
T1
OUT
First Transmitter Output Voltage
15
GND
Ground
16
V
CC
Supply Voltage
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Val ue
Unit
V
CC
Supply Voltage
-0.3 to 6
V
V+
Extra Positive Voltage
(V
CC
-0.3) to 13.2
V
V-
Extra Negative Voltage
0.3 to -13.2
V
T
IN
Transmitter Input Voltage Range
-0.3 to (V
CC
+ 0.3)
V
R
IN
Receiver Input Voltage Range
30
V
T
OUT
Transmitter Output Voltage Range
15
V
R
OUT
Receiver Output Voltage Range
-0.3 to (V
CC
+ 0.3)
V
T
SCTOUT
Short Circuit Duration on T
OUT
infinite
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
ST232A
2/10
TRANSMITTER ELECTRICAL CHARACTERISTICS
(C
1
-C
4
= 0.1
F, 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
Test Co nditi ons
Value
Un it
Min.
T yp.
Max.
V
TOUT
Output Voltage Swing
All Transmitter outputs are
loaded with 3K
to GND
5
9
V
I
TIL
Logic Pull-Up Current
T
IN
= 0 V
5
40
A
V
TIL
Input Logic Threshold Low
0.8
1.4
V
V
TIH
Input Logic Threshold High
1.4
2
V
SR
T
Transition Slew Rate
T
A
= 25
o
C, V
CC
= 5 V,
R
L
= 3 to 7 K
,
C
L
= 50 to 2500 pF (Note 1)
6
12
30
V/
s
D
R
Data Rate
(Note 2)
200
400
Kbits/s
R
TOUT
Transmitter Output Resistance
V
CC
= V+ = V- = 0V
V
OUT
=
2 V
300
10M
I
SC
Transmitter Output Short Circuit
Current
one T
XOUT
to GND
7
22
mA
t
dT
Propagation Delay Time
TTL-CMOS IN to RS-232 OUT
C
L
= 150 pF (50% to 50%)
1.3
3.5
s
Note 1: Measured from 3V to -3Vor from -3V to 3V.
Note 2: One trasmitter output is loaded with R
L
= 3K
to7K
, C
L
= 50 to 1000pF
ELECTRICAL CHARACTERISTICS
(C
1
-C
4
= 0.1
F, 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
Test Co nditi ons
Value
Un it
Min.
T yp.
Max.
I
SUPPLY
V
CC
Power Supply Current
No Load
1.5
4
mA
RECEIVER ELECTRICAL CHARACTERISTICS
(C
1
-C
4
= 0.1
F, 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
Test Co nditi ons
Value
Un it
Min.
T yp.
Max.
V
RIN
Receiver Input Voltage Operating
Range
-30
30
V
R
RIN
RS-232 Input Resistance
T
A
= 25
o
C,
3
5
7
K
V
RIL
RS-232 Input Logic Threshold Low
0.8
1.3
V
V
RIH
RS-232 Input Logic Threshold High
1.8
2.4
V
V
RIHYS
RS-232 Input Hysteresis
V
CC
= 5 V
0.2
0.5
1
V
V
ROL
TTL/CMOS Output Voltage Low
I
OUT
= 3.2mA (to V
CC
)
0.2
0.4
V
V
ROH
TTL/CMOS Output Voltage High
I
OUT
= 1mA (to GND)
3.5
V
CC
-0.2
V
I
SCR
Receiver Output Short Circuit
Current
to GND
to V
CC
2
10
10
30
mA
mA
t
dR
Propagation Delay Time
C
L
=150pF (Note 1)
0.1
0.5
s
Note 1: RS-232 IN to TTL-CMOS OUT (from 50% to 50%)
ST232A
3/10
APPLICATION CIRCUITS (note 1, note 2)
C4
+
C1
+
C1+
C1-
3
C2
+
C2+
C2-
4
5
11
10
12
9
TTL / CMOS OUTPUTS
TTL / CMOS INPUTS
V-
6
C5
+
+
C3
+5V INPUT
1
16
Vcc
V+
2
+10V
-10V
RS 232 OUTPUTS
RS 232 INPUTS
14
7
13
8
15
GND
5K
5K
+5V TO +10V
VOLTAGE
DOUBLER
+10V TO -10V
VOLTAGE
INVERTER
+5V
400K
T1
OUT
T1
IN
+5V
400K
T2
IN
T2
OUT
T1
T2
R2
IN
R1
IN
R2
OUT
R1
OUT
R1
R2
Capacitance Value (
F)
C1
C2
C3
C4
C5
0.1
0.1
0.1
0.1
0.1
Note 1: C
1-4
capacitors can even be 1
F ones.
Note 2: C
1-4
canbe common or biased capacitors.
ST232A
4/10
Driver Voltage Transfer Characteristics
Driver Short Circuit Output Current vs
Temperature
Receiver Threshold vs Supply Voltage
Driver Output Current vs Output Voltage
Driver Short Circuit Supply Current vs
Temperature
Receiver Threshold vs Temperature
ST232A
5/10
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