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ICL232 Datasheet(PDF) 5 Page - Harris Corporation

Part No. ICL232
Description  5V Powered, Dual RS-232 Transmitter/Receiver
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Maker  HARRIS [Harris Corporation]
Homepage  http://www.harris.com
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ICL232 Datasheet(HTML) 5 Page - Harris Corporation

   
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8-53
Applications
The ICL232 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.
A simple duplex RS-232 port with CTS/RTS handshaking is
illustrated in Figure 10. Fixed output signals such as DTR
(data terminal ready) and DSRS (data signaling rate select)
is generated by driving them through a 5k
Ω resistor
connected to V+.
In applications requiring four RS-232 inputs and outputs
(Figure 11), 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.
ROUT
GND < VROUT < VCC
5k
RXIN
-30V < RXIN < +30V
GND
VCC
FIGURE 8. RECEIVER
T1IN, T2IN
VOH
VOL
tPLH
tPHL
Average Propagation Delay =
tPHL + tPLH
2
OR
R1IN, R2IN
T1OUT, T2OUT
OR
R1OUT, R2OUT
FIGURE 9. PROPAGATION DELAY DEFINITION
-
+
-
+
-
+
CTR (20) DATA
TERMINAL READY
DSRS (24) DATA
SIGNALING RATE
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)
15
8
13
7
14
16
-
+
6
R2
R1
T2
T1
9
12
10
11
4
5
3
1
ICL232
C1
1
µF
C2
1
µF
TD
RTS
RD
CTS
SELECT
+5V
INPUTS
OUTPUTS
TTL/CMOS
C3
1
µF
C4
1
µF
2
5k
5k
FIGURE 10. SIMPLE DUPLEX RS-232 PORT WITH CTS/RTS
HANDSHAKING
-
+
RS-232
INPUTS AND
DTR (20) DATA TERMINAL
DSRS (24) DATA SIGNALING
DCD (8) DATA CARRIER
R1 (22) RING INDICATOR
SIGNAL GROUND (7)
15
8
13
7
14
2
-
4
R2
R1
T2
T1
9
12
10
11
3
1
ICL232
C1
1
µF
DTR
DSRS
DCD
R1
+5V
INPUTS
OUTPUTS
TTL/CMOS
-
+
-
+
TD (2) TRANSMIT DATA
RTS (4) REQUEST TO SEND
RD (3) RECEIVE DATA
CTS (5) CLEAR TO SEND
8
13
7
14
15
R2
R1
T2
T1
9
12
10
11
4
5
3
1
ICL232
C1
1
µF
C2
1
µF
TD
RTS
RD
CTS
INPUTS
OUTPUTS
TTL/CMOS
-
+
5
C2
1
µF
16
C3
2
6
2
6
V-
V+
-
C4
2
µF
OUTPUTS
RATE SELECT
READY
DETECT
FIGURE 11. COMBINING TWO ICL232s FOR 4 PAIRS OF RS-232 INPUTS AND OUTPUTS
µF
ICL232


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