ICL232
Test Circuits
1 C1+
1µF
C3
1µF
C1
+
+4.5V TO
+5.5V INPUT
1
2
3
1µF +
C2
-
4
5
C1+
V+
C1-
C2+
C2-
V-
T2
OUT
R2
IN
V
CC
16
GND 15
3kΩ
T1
OUT
14
R1
IN
13
R1
OUT
12
T1
IN
11
T2
IN
10
R2
OUT
9
T1 OUTPUT
RS-232
±30V
INPUT
TTL/CMOS
OUTPUT
TTL/CMOS
INPUT
TTL/CMOS
INPUT
TTL/CMOS
OUTPUT
5 C2-
6 V-
7 T2
OUT
8 R2
IN
R1
OUT
12
T1
IN
11
T2
IN
10
R2
OUT
9
T2
OUT
V
CC
16
GND 15
T1
OUT
14
R1
IN
13
-
+
2 V+
3 C1-
4 C2+
-
3kΩ
7
T2 OUTPUT
RS-232
±30V
INPUT
8
FIGURE 1. GENERAL TEST CIRCUIT
Typical Performance Curves
550
V+, V- SUPPLY IMPEDANCES (Ω)
500
OUTPUT VOLTAGE (|V|)
o
450 T
A
= 25 C
EXTERNAL SUPPLY LOAD
400 1kΩ BETWEEN V+ + GND
OR V- + GND
350 TRANSMITTER OUTPUT
300
250
200
150
3
OPEN CIRCUIT
GUARANTEED
OPERATING
RANGE
V+ SUPPLY
FIGURE 3. V+, V- OUTPUT IMPEDANCES vs V
CC
Pin Descriptions
PDIP, CERDIP
1
2
3
4
5
6
7
8
9
10
11
SOIC
1
2
3
4
5
6
7
8
9
10
11
PIN NAME
C1+
V+
C1-
C2+
C2-
V-
T2
OUT
R2
IN
R2out
T2
IN
T1
IN
DESCRIPTION
External capacitor “+” for internal voltage doubler.
Internally generated +10V (typical) supply.
External capacitor “-” for internal voltage doubler.
External capacitor “+” internal voltage inverter.
External capacitor “-” internal voltage inverter.
Internally generated -10V (typical) supply.
RS-232 Transmitter 2 output
±10V
(typical).
RS-232 Receiver 2 input, with internal 5K pulldown resistor to GND.
Receiver 2 TTL/CMOS output.
Transmitter 2 TTL/CMOS input, with internal 400K pullup resistor to V
CC
.
Transmitter 1 TTL/CMOS input, with internal 400K pullup resistor to V
CC
.
-
1µF C4
+
6
R
OUT
= V
IN
/I
V
IN
=
±2V
A
T1
OUT
FIGURE 2. POWER-OFF SOURCE RESISTANCE
CONFIGURATION
10
9
V- SUPPLY
8
7
6
5
4
3
0
1
2
3
4
5
6
7
8
9
10
|I
LOAD
| (mA)
T
A
= 25
o
C
TRANSMITTER OUTPUTS
OPEN CIRCUIT
V- (V
CC
= 4.5V)
V- (V
CC
= 5V)
V+ (V
CC
= 5V)
V+ (V
CC
= 4.5V)
4
5
6
INPUT SUPPLY VOLTAGE V
CC
(V)
FIGURE 4. V+, V- OUTPUT VOLTAGES vs LOAD CURRENT
8-51
HARRIS [ HARRIS CORPORATION ]
