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Intersil Electronic Components Datasheet



ICL3221EM

RS-232 Transmitters/Receivers



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ICL3221EM pdf
±15kV ESD Protected, +3V, 1µA, 250kbps, RS-232
Transmitters/Receivers
ICL3221EM
Features
The Intersil ICL3221EM devices are 3.0V powered RS-232
transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 specifications. 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, 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. The device is fully
compatible with 3.3V-only systems.
The ICL3221EM features 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 ICL3221EM.
Related Literature
• ESD Protection for RS-232 I/O Pins to ±15kV
(IEC61000)
• Drop in Replacement for MAX3221E
• RS-232 Compatible with VCC = 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
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . 250kbps
• Power Supply Range. . . . . . . Single +3.0V to +3.6V
• Low Supply Current in Power-down State . . . . . . 1µA
• Pb-Free (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
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
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TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
NUMBER
OF Tx
NUMBER
OF Rx
DATA
RATE
(kbps)
RECEIVER
ENABLE
FUNCTION?
READY
OUTPUT?
MANUAL
POWER-DOWN?
AUTOMATIC
POWER-DOWN
FUNCTION?
ICL3221EM
1
1 250
Yes
No
Yes
Yes
Ordering Information
PART
NUMBER
PART
MARKING
TEMP RANGE
(°C)
PACKAGE
PKG.
DWG. #
ICL3221EMVZ* (Notes 1, 2, 3) 3221 EMVZ
-55 to +125
16 Ld TSSOP
M16.173
NOTES:
1. Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both
SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ICL3221EM. For more information on MSL please
see techbrief TB363.
December 17, 2009
FN7552.0
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.



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ICL3221EM pdf
Pin Configurations
ISL3221EM
ICL3221EM
(16 LD TSSOP)
TOP VIEW
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
R1IN 8
16 FORCEOFF
15 VCC
14 GND
13 T1OUT
12 FORCEON
11 T1IN
10 INVALID
9 R1OUT
Pin Descriptions
PIN
PIN
NUMBER
FUNCTION
EN 1 Active low receiver enable control
C1+
2 External capacitor (voltage doubler) is connected to this lead.
V+ 3 Internally generated positive transmitter supply (+5.5V).
C1- 4 External capacitor (voltage doubler) is connected to this lead.
C2+
5 External capacitor (voltage inverter) is connected to this lead.
C2- 6 External capacitor (voltage inverter) is connected to this lead.
V- 7 Internally generated negative transmitter supply (-5.5V).
R1IN
8 ±15kV ESD Protected, RS-232 compatible receiver inputs.
R1OUT
9 TTL/CMOS level receiver outputs.
INVALID
10 Active low output that indicates if no valid RS-232 levels are present on any receiver input.
T1IN
11 TTL/CMOS compatible transmitter Inputs.
FORCEON
12
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T1OUT
13
Active high input to override automatic power-down circuitry thereby keeping transmitters active
(FORCEOFF must be high).
±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs.
GND
14 Ground connection.
VCC
15 System power supply input (3.0V to 3.6V).
FORCEOFF 16 Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry
and FORCEON (see Table 2).
2 FN7552.0
December 17, 2009



Part Number ICL3221EM
Description RS-232 Transmitters/Receivers
Maker Intersil Corporation - Intersil Corporation
Total Page 12 Pages
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