HIN232, HIN236, HIN237, HIN238, HIN239, HIN240, HIN241
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.
+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
1
C1 +
1µF
-
TD
TTL/CMOS
INPUTS AND
OUTPUTS
RTS
RD
CTS
9
R2
R1
3
11
10
12
HIN232
T1
T2
4
5
14
7
13
8
15
16
+ C2
-
1µF
TD (2) TRANSMIT DATA
RTS (4) REQUEST TO SEND
RD (3) RECEIVE DATA
CTS (5) CLEAR TO SEND
+
V- V+
6
2
16
HIN232
1
4
5
T1
T2
14
7
13
R2
R1
8
+
C4
6
2
-
C3
-
+5V
RS-232
INPUTS AND OUTPUTS
2µF
2µF
C1 +
1µF
-
DTR
TTL/CMOS
INPUTS AND
OUTPUTS
DSRS
DCD
R1
3
11
10
12
9
+ C2
-
1µF
DTR (20) DATA TERMINAL READY
DSRS (24) DATA SIGNALING RATE SELECT
DCD (8) DATA CARRIER DETECT
R1 (22) RING INDICATOR
SIGNAL GROUND (7)
15
FIGURE 10. COMBINING TWO HIN232s FOR 4 PAIRS OF RS-232 INPUTS AND OUTPUTS
12
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
