DATASHEET
ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
One Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232
Transmitters/Receivers
The Intersil ICL32XX 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. 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
powerdown functions (except for the ICL3232), reduce the
standby supply current to a 1A 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 ICL324X 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
ICL3221, ICL3223 and ICL3243,
feature an
automatic powerdown
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
ICL32XX 3V family.
FN4805
Rev 22.00
September 1, 2015
Features
• Pb-Free Plus Anneal Available as an Option
(RoHS Compliant) (See Ordering Info)
• 15kV ESD Protected (Human Body Model)
• Drop in Replacements for MAX3221, MAX3222,
MAX3223, MAX3232, MAX3241, MAX3243, SP3243
• ICL3221 is Low Power, Pin Compatible Upgrade for 5V
MAX221
• ICL3222 is Low Power, Pin Compatible Upgrade for 5V
MAX242, and SP312A
• ICL3232 is Low Power Upgrade for HIN232/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
0.1F Capacitors
• Manual and Automatic Powerdown Features (Except
ICL3232)
• Guaranteed Mouse Driveability (ICL324X Only)
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/s
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . . .1A
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
TABLE 1. SUMMARY OF FEATURES
NO. OF NO. OF
Tx.
Rx.
1
2
2
2
3
3
1
2
2
2
5
5
NO. OF
MONITOR Rx.
(R
OUTB
)
0
0
0
0
2
1
DATA
RATE
(kbps)
250
250
250
250
250
250
Rx. ENABLE
FUNCTION?
Yes
Yes
Yes
No
Yes
No
READY
OUTPUT?
No
No
No
No
No
No
MANUAL
POWER-
DOWN?
Yes
Yes
Yes
No
Yes
Yes
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
No
Yes
No
No
Yes
PART NUMBER
ICL3221
ICL3222
ICL3223
ICL3232
ICL3241
ICL3243
FN4805 Rev 22.00
September 1, 2015
Page 1 of 28
ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
Pinouts
(Continued)
ICL3243 (SOIC, SSOP, TSSOP)
TOP VIEW
C2+ 1
C2- 2
V-
3
28 C1+
27 V+
26 V
CC
25 GND
24 C1-
23 FORCEON
22 FORCEOFF
21 INVALID
20 R2
OUTB
19 R1
OUT
18 R2
OUT
17 R3
OUT
16 R4
OUT
15 R5
OUT
R1
IN
4
R2
IN
5
R3
IN
6
R4
IN
7
R5
IN
8
T1
OUT
9
T2
OUT
10
T3
OUT
11
T3
IN
12
T2
IN
13
T1
IN
14
Pin Descriptions
PIN
V
CC
V+
V-
GND
C1+
C1-
C2+
C2-
T
IN
T
OUT
R
IN
R
OUT
R
OUTB
INVALID
EN
SHDN
System power supply input (3.0V to 5.5V).
Internally generated positive transmitter supply (+5.5V).
Internally generated negative transmitter supply (-5.5V).
Ground connection.
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
TTL/CMOS compatible transmitter Inputs.
RS-232 level (nominally
5.5V)
transmitter outputs.
RS-232 compatible receiver inputs.
TTL/CMOS level receiver outputs.
TTL/CMOS level, noninverting, always enabled receiver outputs.
Active low output that indicates if no valid RS-232 levels are present on any receiver input.
Active low receiver enable control; doesn’t disable R
OUTB
outputs.
Active low input to shut down transmitters and on-board power supply, to place device in low power mode.
FUNCTION
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (See Table 2).
FORCEON
Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).
FN4805 Rev 22.00
September 1, 2015
Page 4 of 28
Analog electronics
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