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PDF ICL232 Data sheet ( Hoja de datos )
| Número de pieza | ICL232 | |
| Descripción | +5V Powered Dual RS-232 Transmitter/Receiver | |
| Fabricantes | Harris Corporation | |
| Logotipo |  |
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SEMICONDUCTOR
ICL232
August 1997
+5V Powered, Dual RS-232 Transmitter/Receiver
Features
Description
• Meets All RS-232C and V.28 Specifications
• Requires Only Single +5V Power Supply
• Onboard Voltage Doubler/Inverter
• Low Power Consumption
• 2 Drivers
- ±9V Output Swing for +5V lnput
- 300Ω Power-off Source Impedance
- Output Current Limiting
- TTL/CMOS Compatible
- 30V/µs Maximum Slew Rate
• 2 Receivers
- ±30V Input Voltage Range
- 3kΩ to 7kΩ Input Impedance
- 0.5V Hysteresis to Improve Noise Rejection
• All Critical Parameters are Guaranteed Over the Entire
Commercial, Industrial and Military Temperature Ranges
The ICL232 is a dual RS-232 transmitter/receiver interface
circuit that meets all ElA RS-232C and V.28 specifications. It
requires a single +5V power supply, and features two
onboard charge pump voltage converters which generate
+10V and -10V supplies from the 5V supply.
The drivers feature true TTL/CMOS input compatibility, slew-
rate-limited output, and 300Ω power-off source impedance.
The receivers can handle up to +30V, and have a 3kΩ to 7kΩ
input impedance. The receivers also have hysteresis to
improve noise rejection.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
ICL232CPE
0 to 70 16 Ld PDIP
ICL232CBE
0 to 70 16 Ld SOIC
PKG.
NO.
E16.3
M16.3
Applications
• Any System Requiring RS-232 Communications Port
- Computer - Portable and Mainframe
- Peripheral - Printers and Terminals
- Portable Instrumentation
- Modems
• Dataloggers
ICL232lPE
ICL232lJE
ICL232lBE
ICL232MJE
-40 to 85 16 Ld PDIP
-40 to 85 16 Ld CERDIP
-40 to 85 16 Ld SOIC
-55 to 125 16 Ld CERDIP
E16.3
F16.3
M16.3
F16.3
Pinout
ICL232 (PDIP, CERDIP, SOIC)
TOP VIEW
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
T2OUT 7
R2IN 8
16 VCC
15 GND
14 T1OUT
13 R1IN
12 R1OUT
11 T1IN
10 T2IN
9 R2OUT
Functional Diagram
+5V
+
1.0µF
16
1µF
1µF
T1IN
T2IN
R1OUT
1
+ C1+
VCC
+5V TO 10V
2
3 C1- VOLTAGE INVERTER V+
4
+ C2+
+10V TO -10V
5 C2- VOLTAGE INVERTER
V- 6
+5V T1
11 400kΩ
14
1µF
+
+ 1µF
T1OUT
+5V T2
10 400kΩ
7
12 13
R1 5kΩ
T2OUT
R1IN
R2OUT
9
8
R2 5kΩ
R2IN
15
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1997
8-49
File Number 3020.5
1 page  
ICL232
VCC
RXIN
-30V < RXIN < +30V
GND
5kΩ
ROUT
GND < VROUT < VCC
FIGURE 8. RECEIVER
T1IN, T2IN
OR
R1IN, R2IN
T1OUT, T2OUT
OR
R1OUT, R2OUT
tPHL
tPLH
VOH
VOL
Average Propagation Delay =
tPHL + tPLH
2
FIGURE 9. PROPAGATION DELAY DEFINITION
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 5kΩ resistor
connected to V+.
+5V
1
C1 +
1µF - 3
4
C2 +
1µF - 5
16
ICL232
INPUTS
OUTPUTS
TTL/CMOS
TD
RTS
RD
CTS
11 T1
T2
10
12
9 R2 R1
- C3
+ 1µF
2 5kΩ CTR (20) DATA
TERMINAL READY
5kΩ DSRS (24) DATA
SIGNALING RATE
6
- C4
SELECT
+ 1µF RS-232
INPUTS AND OUTPUTS
14
TD (2) TRANSMIT DATA
7 RTS (4) REQUEST TO SEND
13
RD (3) RECEIVE DATA
8 CTS (5) CLEAR TO SEND
15 SIGNAL GROUND (7)
FIGURE 10. SIMPLE DUPLEX RS-232 PORT WITH CTS/RTS
HANDSHAKING
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.
1
C1 +
1µF - 3
ICL232
4
+ C2
5 - 1µF
INPUTS
OUTPUTS
TTL/CMOS
11
TD
10
RTS
T1 14
TD (2) TRANSMIT DATA
T2
7 RTS (4) REQUEST TO SEND
12 13
RD RD (3) RECEIVE DATA
CTS 9 R2 R1 8 CTS (5) CLEAR TO SEND
15
C4 -
2µF
62
V- V+
62
C3 -
2 µF
16
+5V
RS-232
INPUTS AND
OUTPUTS
ICL232
1
C1 +
1µF - 3
INPUTS
OUTPUTS
TTL/CMOS
DTR
DSRS
DCD
R1
11 T1
T2
10
12
R2
9
R1
4
+ C2
5 - 1µF
14 DTR (20) DATA TERMINAL
READY
7 DSRS (24) DATA SIGNALING
RATE SELECT
13 DCD (8) DATA CARRIER
DETECT
8 R1 (22) RING INDICATOR
15 SIGNAL GROUND (7)
FIGURE 11. COMBINING TWO ICL232s FOR 4 PAIRS OF RS-232 INPUTS AND OUTPUTS
8-53
5 Page | ||
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