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ICL3221E, ICL3222E, ICL3223E,
ICL3232E, ICL3241E, ICL3243E
Data Sheet
March 2004
FN4910.11
±15kV ESD Protected, +3V to +5.5V,
1Microamp, 250kbps, RS-232
Transmitters/Receivers
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 powerdown 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 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
ICL32XXE 3V family.
Features
• Pb-free Available as an Option (See Ordering Info)
• 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 Powerdown 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 Powerdown State. . . . . . . . . . .1µA
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)”
MANUAL
POWER-
DOWN?
Yes
Yes
Yes
No
Yes
Yes
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
No
Yes
No
No
Yes
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
PART NUMBER
ICL3221E
ICL3222E
ICL3223E
ICL3232E
ICL3241E
ICL3243E
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ICL3221E , ICL3222E , ICL3223E , ICL3232E , ICL3241E, ICL3243E
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.
±15kV
ESD Protected
,
RS-232 level (nominally
±5.5V)
transmitter outputs.
±15kV
ESD Protected
,
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).
Typical Operating Circuits
ICL3221E
C
3
(OPTIONAL CONNECTION, NOTE)
+3.3V
15
V
CC
V+
3
+ C
3
0.1µF
C
4
+
V- 7
T
1
13
+ 0.1µF
T1
OUT
R1
IN
RS-232
LEVELS
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
4
Microcontroller MCU
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