HIN200 thru HIN213
Application Information
+5V
-
+
The HINXXX 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 conven-
tional RS-232 interface circuits. The applications presented
represent typical interface configurations.
16
CTR (20) DATA
TERMINAL READY
1
+
C1
0.1µF
3
4
DSRS (24) DATA
SIGNALING RATE
SELECT
-
HIN202
6
+
-
+
C2
0.1µF
RS-232
INPUTS AND OUTPUTS
5
-
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+.
T1
11
14
TD
TD (2) TRANSMIT DATA
T2
10
12
7
RTS (4) REQUEST TO SEND
RD (3) RECEIVE DATA
INPUTS RTS
OUTPUTS
13
RD
TTL/CMOS
R2
R1
9
8
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 res-
ervoir 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.
CTS
CTS (5) CLEAR TO SEND
15
SIGNAL GROUND (7)
FIGURE 9. SIMPLE DUPLEX RS-232 PORT WITH CTS/RTS
HANDSHAKING
1
4
+
+
C1
0.1µF
C2
0.1µF
HIN202
T1
5
3
-
-
11
14
TD
RTS
RD
TD (2) TRANSMIT DATA
RTS (4) REQUEST TO SEND
RD (3) RECEIVE DATA
T2
10
12
7
INPUTS
OUTPUTS
TTL/CMOS
13
R2
R1
9
8
CTS
CTS (5) CLEAR TO SEND
15
V
16
CC
6
6
2
2
C4
C3
+5V
-
-
V- V+
RS-232
INPUTS AND OUTPUTS
0.2µF
0.2µF
V
16
4
CC
HIN202
T1
1
+
+
C1
0.1µF
C2
0.1µF
5
3
-
-
11
14
DTR
DSRS
DCD
R1
DTR (20) DATA TERMINAL READY
DSRS (24) DATA SIGNALING RATE SELECT
DCD (8) DATA CARRIER DETECT
R1 (22) RING INDICATOR
T2
10
12
7
INPUTS
OUTPUTS
TTL/CMOS
13
R2
R1
9
8
15
SIGNAL GROUND (7)
FIGURE 10. COMBINING TWO HIN202s FOR 4 PAIRS OF RS-232 INPUTS AND OUTPUTS
8-15
HARRIS [ HARRIS CORPORATION ]
