3-1
TM
File Number
4805.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright
Intersil Corporation 2000
ICL3221 thru ICL3243
1 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 1
A 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.
Features
Drop in Replacements for MAX3221, MAX3222,
MAX3223, MAX3232, MAX3241, MAX3243, SP3243
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
Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
Latch-Up Free
On-Chip Voltage Converters Require Only Four External
0.1
F Capacitors
Manual and Automatic Powerdown Features (Except
ICL3232)
Guaranteed Mouse Driveability
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 . . . . . . . . . . 1
A
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
PART
NUMBER
NO. OF
Tx.
NO. OF
Rx.
NO. OF
MONITOR Rx.
(R
OUTB
)
DATA
RATE
(kbps)
Rx. ENABLE
FUNCTION?
READY
OUTPUT?
MANUAL
POWER-
DOWN?
AUTOMATIC
POWERDOWN
FUNCTION?
ICL3221
1
1
0
250
YES
NO
YES
YES
ICL3222
2
2
0
250
YES
NO
YES
NO
ICL3223
2
2
0
250
YES
NO
YES
YES
ICL3232
2
2
0
250
NO
NO
NO
NO
ICL3241
3
5
2
250
YES
NO
YES
NO
ICL3243
3
5
1
250
NO
NO
YES
YES
Data Sheet
May 2000
3-4
Pin Descriptions
PIN
FUNCTION
V
CC
System power supply input (3.0V to 5.5V).
V+
Internally generated positive transmitter supply (+5.5V).
V-
Internally generated negative transmitter supply (-5.5V).
GND
Ground connection.
C1+
External capacitor (voltage doubler) is connected to this lead.
C1-
External capacitor (voltage doubler) is connected to this lead.
C2+
External capacitor (voltage inverter) is connected to this lead.
C2-
External capacitor (voltage inverter) is connected to this lead.
T
IN
TTL/CMOS compatible transmitter Inputs.
T
OUT
RS-232 level (nominally
5.5V) transmitter outputs.
R
IN
RS-232 compatible receiver inputs.
R
OUT
TTL/CMOS level receiver outputs.
R
OUTB
TTL/CMOS level, noninverting, always enabled receiver outputs.
INVALID
Active low output that indicates if no valid RS-232 levels are present on any receiver input.
EN
Active low receiver enable control; doesn't disable R
OUTB
outputs.
SHDN
Active low input to shut down transmitters and on-board power supply, to place device in low power mode.
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
ICL3221
15
V
CC
T1
OUT
T1
IN
T
1
0.1
F
+0.1
F
+
0.1
F
11
13
2
4
3
7
V+
V-
C1+
C1-
C2+
C2-
+
0.1
F
5
6
R1
OUT
R1
IN
R
1
8
9
5k
C
1
C
2
+ C
3
C
4
EN
1
GND
+3.3V
+
0.1
F
14
TTL/CMOS
LOGIC LEVELS
RS-232
LEVELS
FORCEON
FORCEOFF
12
16
V
CC
10
INVALID
TO POWER
CONTROL LOGIC
ICL3221 thru ICL3243
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