DATASHEET
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E,
ICL3243E
The Intersil ICL32xxE devices are 3.0V to 5.5V
powered RS-232 transmitters/receivers which meet
ElA/TIA-232 and V.28/V.24 specifications, even at V
CC
= 3.0V. Additionally, they provide
±
15kV ESD
protection (IEC61000-4-2 Air Gap and Human Body
Model) on transmitter outputs and receiver inputs (RS-
232 pins). Targeted applications are PDAs, Palmtops,
and notebook and laptop computers where the low
operational, and even lower standby, power
consumption is critical. Efficient on-chip charge pumps,
coupled with manual and automatic power-down
functions (except for the ICL3232E), reduce the
standby supply current to a 1µA trickle. Small footprint
packaging, and the use of small, low value capacitors
ensure board space savings as well. Data rates greater
than 250kbps are guaranteed at worst case load
conditions. This family is fully compatible with 3.3V-
only systems, mixed 3.3V and 5.0V systems, and
5.0V-only systems.
The ICL324XE are 3-driver, 5-receiver devices that
provide a complete serial port suitable for laptop or
notebook computers. Both devices also include
noninverting always-active receivers for “wake-up”
capability.
The
ICL3221E, ICL3223E and ICL3243E,
feature
an
automatic power-down
function which powers
down the on-chip power-supply and driver circuits.
This occurs when an attached peripheral device is shut
off or the RS-232 cable is removed, conserving system
power automatically without changes to the hardware
or operating system. These devices power up again
when a valid RS-232 voltage is applied to any receiver
input.
Table 1 summarizes the features of the devices
represented by this data sheet, while Application Note
AN9863
summarizes the features of each device
comprising the ICL32xxE 3V family.
FN4910
Rev 22.00
December 9, 2015
Features
• ESD Protection for RS-232 I/O Pins to
±
15kV
(IEC61000)
• Drop in Replacements for MAX3221E, MAX3222E,
MAX3223E, MAX3232E, MAX3241E, MAX3243E,
SP3243E
• ICL3221E is a Low Power, Pin Compatible Upgrade
for 5V MAX221E
• ICL3222E is a Low Power, Pin Compatible Upgrade
for 5V MAX242E, and SP312E
• ICL3232E is a Low Power Upgrade for HIN232E,
ICL232 and Pin Compatible Competitor Devices
• RS-232 Compatible with V
CC
= 2.7V
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four
External 0.1µF Capacitors
• Manual and Automatic Power-Down Features
• Guaranteed Mouse Driveability (ICL324xE Only)
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate 250kbps
• Wide Power Supply Range Single +3V to +5.5V
• Low Supply Current in Power-Down State1µA
• Pb-Free Available (RoHS Compliant)
Applications
• Any System Requiring RS-232 Communication
Ports
- Battery Powered, Hand-Held, and Portable
Equipment
- Laptop Computers, Notebooks, Palmtops
- Modems, Printers and other Peripherals
- Digital Cameras
- Cellular/Mobile Phones
Related Literature
• Technical Brief
TB363
“Guidelines for Handling and
Processing Moisture Sensitive Surface Mount
Devices (SMDs)”
FN4910 Rev 22.00
December 9, 2015
Page 1 of 33
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
TABLE 1. SUMMARY OF FEATURES
NUMBER OF
MONITOR
RECEIVERS
(R
OUTB
)
0
0
0
0
2
1
DATA
RATE
(kbps)
250
250
250
250
250
250
RECEIVER
ENABLE
FUNCTION?
Yes
Yes
Yes
No
Yes
No
AUTOMATIC
POWER-
DOWN
FUNCTION?
Yes
No
Yes
No
No
Yes
PART
NUMBER NUMBER
NUMBER
OF Tx
OF Rx
ICL3221E
ICL3222E
ICL3223E
ICL3232E
ICL3241E
ICL3243E
1
2
2
2
3
3
1
2
2
2
5
5
READY
OUTPUT?
No
No
No
No
No
No
MANUAL
POWER-DOWN?
Yes
Yes
Yes
No
Yes
Yes
Typical Operating Circuits
ICL3221E
C
3
(OPTIONAL CONNECTION, NOTE)
+3.3V
15
V
CC
V+
3
+ C
3
0.1µF
C
4
+ 0.1µF
T1
OUT
R1
IN
RS-232
LEVELS
+
V- 7
T
1
13
8
R
1
1 EN
FORCEOFF
12
FORCEON
GND
14
INVALID
16
10
V
CC
TO POWER
CONTROL LOGIC
5kΩ
+
0.1µF
C
1
0.1µF
C
2
0.1µF
2
+ C1+
4
C1-
5
+ C2+
6
C2-
11
T1
IN
TTL/CMOS
LOGIC LEVELS
R1
OUT
9
NOTE: THE NEGATIVE TERMINAL OF C
3
CAN BE CONNECTED TO EITHER V
CC
OR GND
FN4910 Rev 22.00
December 9, 2015
Page 2 of 33
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
Typical Operating Circuits
+3.3V
(Continued)
ICL3222E
C
3
(OPTIONAL CONNECTION, NOTE)
+
0.1µF
+
2
4
5
+
6
12
11
C1+
C1-
C2+
C2-
T
1
T
2
V-
17
V
CC
3
V+
7
+
15
8
+ C
3
0.1µF
C
4
0.1µF
+
T1
OUT
T2
OUT
RS-232
LEVELS
14
R
1
5kΩ
9
R
2
5kΩ
18
R2
IN
R1
IN
GND
16
SHDN
V
CC
C
1
0.1µF
C
2
0.1µF
T1
IN
T2
IN
TTL/CMOS
LOGIC LEVELS
R1
OUT
13
R2
OUT
10
1 EN
NOTE: THE NEGATIVE TERMINAL OF C
3
CAN BE CONNECTED TO EITHER V
CC
OR GND
ICL3223E
+3.3V
+
0.1µF
2
+
4
5
+
6
13
12
C1+
C1-
C2+
C2-
T
1
T
2
19
V
CC
V+
3
+ C
3
0.1µF
C
4
0.1µF
+
T1
OUT
T2
OUT
RS-232
LEVELS
C
1
0.1µF
C
2
0.1µF
V- 7
17
8
T1
IN
T2
IN
TTL/CMOS
LOGIC LEVELS
R1
OUT
15
R
1
5kΩ
16
R1
IN
R2
OUT
10
1
EN
R
2
5kΩΩ
9
R2
IN
FORCEOFF
14
FORCEON
GND
18
INVALID
20
11
V
CC
TO POWER
CONTROL LOGIC
FN4910 Rev 22.00
December 9, 2015
Page 3 of 33
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
Typical Operating Circuits
+3.3V
+
(Continued)
ICL3232E
0.1µF
1
+
+
3
4
5
11
10
12
R
1
5kΩ
8
R
2
GND
15
5kΩ
R2
IN
C1+
C1-
C2+
C2-
T
1
T
2
V-
16
V
CC
V+
2
+
6
14
7
T2
OUT
13
R1
IN
RS-232
LEVELS
C
3
(OPTIONAL CONNECTION, NOTE)
NOTE: THE NEGATIVE TERMINAL OF C
3
CAN
BE CONNECTED TO EITHER V
CC
OR GND
C
3
+
0.1µF
C
4
0.1µF
+
T1
OUT
C
1
0.1µF
C
2
0.1µF
T1
IN
T2
IN
R1
OUT
TTL/CMOS
LOGIC LEVELS
R2
OUT
9
FN4910 Rev 22.00
December 9, 2015
Page 4 of 33
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
Typical Operating Circuits
ICL3241E
+3.3V
+
0.1µF
C1+
C1-
C2+
C2-
T
1
T
2
T
3
26
V
CC
V+
27
(Continued)
ICL3243E
+3.3V
+
C
1
0.1µF
C
2
0.1µF
0.1µF
28
+
24
1
+
2
C1+
C1-
C2+
C2-
T
1
V-
3
26
V
CC
27
V+
+
C
3
0.1µF
C
1
0.1µF
C
2
0.1µF
T1
IN
T2
IN
T3
IN
R1
OUTB
R2
OUTB
TTL/CMOS
LOGIC
LEVELS
R1
OUT
28
+
24
+
1
2
+ C
3
0.1µF
C
4
0.1µF
+
T1
OUT
V-
3
9
10
11
C
4
0.1µF
+
14
13
12
21
20
19
R
1
T1
IN
RS-232
LEVELS
14
9
T1
OUT
10
T2
OUT
11
T3
OUT
RS-232
LEVELS
T2
OUT
T3
OUT
T2
IN
T3
IN
13
12
T
2
T
3
20
R2
OUTB
4
5kΩ
5
R
2
5kΩ
6
R
3
5kΩ
7
R
4
5kΩ
8
EN
R
5
5kΩ
R5
IN
R5
OUT
15
23
SHDN
GND
25
V
CC
TO POWER
CONTROL
LOGIC
22
21
FORCEOFF
INVALID
GND
25
R
5
FORCEON
5kΩ
R4
IN
R4
OUT
16
R
4
5kΩ
8
R5
IN
R3
IN
RS-232
LEVELS
17
R3
OUT
R
3
5kΩ
7
R4
IN
R2
IN
R1
IN
R1
OUT
TTL/CMOS
LOGIC
LEVELS
R2
OUT
R
1
18
R
2
5kΩ
6
R3
IN
RS-232
LEVELS
5kΩ
5
R2
IN
19
4
R1
IN
R2
OUT
18
17
R3
OUT
16
R4
OUT
15
R5
OUT
23
22
V
CC
FN4910 Rev 22.00
December 9, 2015
Page 5 of 33
