ICL232CBE Intersil, ICL232CBE Datasheet - Page 6

• Manufacturer Part Number: ICL232CBE
• Description: IC 2DRVR/2RCVR RS232 5V 16-SOIC
• Manufacturer: Intersil
• Type: Transceiverr

Specifications of ICL232CBE

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

minimum of 300Ω with ±2V applied to the outputs and V
0V.
Receivers
The receiver inputs accept up to ±30V while presenting the
required 3kΩ to 7kΩ input impedance even it the power is off
(V
1.3V which is within the ±3V limits, known as the transition
region, of the RS-232 specification. The receiver output is
0V to V
greater than 2.4V and high whenever the input is floating or
driven between +0.8V and -30V. The receivers feature 0.5V
hysteresis to improve noise rejection.
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
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 10. Fixed output signals such as DTR
(data terminal ready) and DSRS (data signaling rate select)
CC
R1
T1
GND < T
Average Propagation Delay =
= 0V). The receivers have a typical input threshold of
OUT
OUT
R1
T1
CC
-30V < R
FIGURE 9. PROPAGATION DELAY DEFINITION
OR
IN
IN
, T2
, R2
OR
T
V
. The output will be low whenever the input is
, T2
, R2
XIN
XIN
V+
CC
OUT
V-
OUT
IN
IN
< V
XIN
GND
R
V
CC
XIN
t
FIGURE 7. TRANSMITTER
CC
< +30V
PHL
FIGURE 8. RECEIVER
400kΩ
5kΩ
6
t
PHL +
t
PLH
GND < V
2
300Ω
t
PLH
R
V- < V
ROUT
OUT
T
TOUT
< V
OUT
CC
< V+
V
V
CC
OH
OL
=
ICL232
ICL232
is generated by driving them through a 5kΩ 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
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.
TTL/CMOS
OUTPUTS
FIGURE 10. SIMPLE DUPLEX RS-232 PORT WITH CTS/RTS
INPUTS
1µF
1µF
C1
C2
+5V
RTS
CTS
RD
TD
HANDSHAKING
+
+
-
-
11
10
12
1
3
4
5
9
R2
ICL232
15
T1
16
R1
T2
14
13
2
6
7
8
+
-
+
-
C3
1µF
TD (2) TRANSMIT DATA
RTS (4) REQUEST TO SEND
RD (3) RECEIVE DATA
CTS (5) CLEAR TO SEND
SIGNAL GROUND (7)
C4
1µF
5kΩ
5kΩ
RS-232
INPUTS AND OUTPUTS
CTR (20) DATA
TERMINAL READY
DSRS (24) DATA
SIGNALING RATE
SELECT
July 28, 2005
FN3020.7