廬
ISL4270E
Data Sheet
August 2004
FN6041.1
QFN Packaged, +/-15kV ESD Protected,
+3V to +5.5V, 300nA, 250kbps, RS-232
Transceivers with Enhanced Automatic
Powerdown and a Separate Logic Supply
The Intersil ISL4270E is a 3.0V to 5.5V powered RS-232
transceiver which meets ElA/TIA-232 and V.28/V.24
specifications, even at V
CC
= 3.0V. Additionally, it provides
鹵
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 enhanced automatic powerdown functions, reduce the
standby supply current to a 300nA trickle. Tiny 5mm x 5mm
Quad Flat No-Lead
(QFN) 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 ISL4270E features a V
L
pin that adjusts the logic pin
output levels and input thresholds to values compatible with
the V
CC
powering the external logic (e.g., a UART).
This device includes an
enhanced automatic powerdown
function which powers down the on-chip power-supply and
driver circuits. This occurs when all receiver and transmitter
inputs detect no signal transitions for a period of 30 seconds.
It power back up, automatically, whenever it senses a
transition on any transmitter or receiver input.
Table 1 summarizes the features of the ISL4270E, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
Features
鈥?Available in Near Chip Scale QFN (5mmx5mm) Package
鈥?V
L
Supply Pin for Compatibility with Mixed Voltage
Systems
鈥?ESD Protection for RS-232 I/O Pins to
鹵
15kV (IEC61000)
鈥?Manual and Enhanced Automatic Powerdown Features
鈥?Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
鈥?On-Chip Charge Pumps Require Only Four External
0.1碌F Capacitors
鈥?Receivers Stay Active in Powerdown
鈥?Very Low Supply Current . . . . . . . . . . . . . . . . . . . . 300碌A
鈥?Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
鈥?Wide Power Supply Range. . . . . . . . Single +3V to +5.5V
鈥?Low Supply Current in Powerdown State . . . . . . . . 300nA
鈥?Pb-Free Available (RoHS Compliant)
Applications
鈥?Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Digital Cameras
- PDA鈥檚 and PDA Cradles
- Cellular/Mobile Phones
Ordering Information
PART NO.
ISL4270EIR
ISL4270EIRZ
(See Note)
TEMP.
RANGE (
o
C)
-40 to 85
-40 to 85
PACKAGE
32 Ld QFN
32 Ld QFN
(Pb-free)
PKG. DWG.
#
L32.5x5
L32.5x5
*Add 鈥?T鈥?suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are 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-
020C.
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL4270E
NO. OF NO. OF DATA RATE Rx. ENABLE
Tx.
Rx.
(kbps)
FUNCTION?
3
3
250
NO
V
L
LOGIC
SUPPLY PIN?
YES
MANUAL
ENHANCED AUTOMATIC
POWER- DOWN? POWERDOWN FUNCTION?
YES
YES
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2003, 2004. All Rights Reserved
INTERSIL
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