HIN232 thru HIN241
Test Circuits (HIN232)
+4.5V TO
+5.5V INPUT
1µF
C3
1µF
C1
+
-
+
1 C1+
2 V+
3 C1-
4 C2+
5 C2-
V
CC
16
GND 15
T1
OUT
14
R1
IN
13
R1
OUT
12
T1
IN
11
T2
IN
10
R2
OUT
9
3kΩ
T1 OUTPUT
RS-232
±30V
INPUT
TTL/CMOS OUTPUT
TTL/CMOS INPUT
TTL/CMOS INPUT
TTL/CMOS OUTPUT
1 C1+
2 V+
3 C1-
4 C2+
5 C2-
6 V-
7 T2
OUT
8 R2
IN
V
CC
16
GND 15
T1
OUT
14
R1
IN
13
R1
OUT
12
T1
IN
11
T2
IN
10
R2
OUT
9
-
1µF +
C2
-
1µF C4
3kΩ
T2
OUTPUT
RS-232
±30V
INPUT
V
IN
=
±2V
FIGURE 7. GENERAL TEST CIRCUIT
Applications
The HIN2XX may be used for all RS-232 data terminal and
communication links. It is particularly useful in applications
where
±12V
power supplies are not available for
conventional RS-232 interface circuits. The applications
presented represent typical interface configurations.
A simple duplex RS-232 port with CTS/RTS handshaking is
illustrated in Figure 9. Fixed output signals such as DTR
(data terminal ready) and DSRS (data signaling rate select)
is generated by driving them through a 5kΩ resistor
connected to V+.
In applications requiring four RS-232 inputs and outputs
(Figure 10), note that each circuit requires two charge pump
capacitors (C1 and C2) but can share common reservoir
capacitors (C3 and C4). The benefit of sharing common
reservoir capacitors is the elimination of two capacitors and
the reduction of the charge pump source impedance which
effectively increases the output swing of the transmitters.
-
+
6 V-
7 T2
OUT
8 R2
IN
R
OUT
= V
IN
/1 T2
OUT
T1
OUT
A
FIGURE 8. POWER-OFF SOURCE RESISTANCE
CONFIGURATION
+5V
-
+
1
16
2
3
HIN232
4
6
DTR (20) DATA
TERMINAL READY
DSRS (24) DATA
SIGNALING RATE
SELECT
RS-232
INPUTS AND OUTPUTS
TD (2) TRANSMIT DATA
RTS (4) REQUEST TO SEND
RD (3) RECEIVE DATA
CTS (5) CLEAR TO SEND
SIGNAL GROUND (7)
C1 +
1µF
-
C2 +
1µF
-
TD
-
+
5
11
T1
T2
14
7
13
R1
8
10
TTL/CMOS RTS
INPUTS AND
12
RD
OUTPUTS
R2
9
CTS
15
FIGURE 9. SIMPLE DUPLEX RS-232 PORT WITH CTS/RTS
HANDSHAKING
10
INTERSIL [ INTERSIL CORPORATION ]
