ISL4244E datasheet for Intel(Intersil) ISL4244E
Summary
These ultra-compact RS-232 transceivers are engineered for portable and space-constrained electronics, including PDAs, laptop computers, and notebook devices. Featuring small 5x5mm QFN packaging and operating across a wide 2.7V to 5.5V range, the ISL4238E/44E/45E delivers robust performance with ±15kV ESD protection. The manual details optimal integration, including features like automatic powerdown and industry-standard compliance, ensuring minimal standby current consumption for battery-powered systems.
Page 1 Text Content
ISL4238E, ISL4244E, ISL4245E
April 2004 FN8038.3Data Sheet
QFN Packaged, ±15k V ESD Protected, Features +2.7V to +5.5V, 10Nanoamp, 250kbps/
Parameters Fully Specified for 10% Tolerance Supplies
1Mbps, RS-232 Transceivers with
and Full Industrial Temp Range
Enhanced Automatic Powerdown
Available in Small QFN (5mm x 5mm) Package which is
The Intersil ISL4238E/44E/45E devices are 2.7V to 5.5V 60% Smaller than a 28 Lead TSSOP powered RS-232 transmitters/receivers which meet
ESD Protection for RS-232 I/O Pins to ±15k V (IEC6100)
El A/TIA-232 and V.28/V.24 specifications, even at
VCC 3.0V. Additionally, they provide ±15k V ESD protection DTE (ISL4244E/45E) and DCE (ISL4238E) Versions
(IEC6100-4-2 Air Gap and Human Body Model) on
Lowest Supply Current in Powerdown . . . . . . . . . . . .10n A
transmitter outputs and receiver inputs (RS-232 pins).
Active Feedback Resistors on TX and Logic Inputs
Targeted applications are PDAs, Palmtops, and notebook
(ISL4238E)
and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient on- Flow Through Pinouts chip charge pumps, coupled with manual and enhanced
Manual and Enhanced Automatic Powerdown Features
automatic powerdown functions, reduce the standby supply
current to a 10n A trickle. Tiny 5mm x 5mm Quad Flat No- Guaranteed Minimum Data Rate 250kbps (ISL4238E/44E) / 1Mbps (ISL4245E)
Lead (QFN) packaging and the use of small, low value capacitors ensure board space savings as well. Data rates Latch-Up Free greater than 250kbps (ISL4238E/44E)/1Mbps (ISL4245E)
On-Chip Charge Pumps Require Only Four External
are guaranteed at worst case load conditions.
0.1µF Capacitors
The ISL424XE are 3 driver, 5 receiver (DTE) devices that,
Wide Power Supply Range. . . . . . . Single +2.7V to +5.5V
coupled with the QFN package, provide the industry’s
smallest, lowest power complete serial port suitable for Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
www.BD IC.com/In rsil PDAs, and laptop or notebook computers. The 5x5 QFN RS-232 Compatible with VCC = 2.7V requires 60% less board area than a 28 lead TSSOP, and is
Pb-free Available as an Option
nearly 20% thinner. The devices also include a noninverting always-active receiver for “wake-up” capability.
Applications
The ISL4238E is a 5 driver, 3 receiver device optimized for
Any Space Constrained System Requiring RS-232 Ports
DCE applications with full hardware handshaking. It also
Battery Powered, Hand-Held, and Portable Equipment
includes a noninverting always-active receiver for RING
Laptop Computers, Notebooks
INDICATOR monitoring. Transmitter and logic inputs include
PDAs and Palmtops, Data Cables
active feedback resistors that retain the input state once
Cellular/Mobile Phones, Digital Cameras, GPS
driven to a valid logic level.
Receivers
These devices feature an enhanced automatic
Related Literature
powerdown function which powers down the on-chip power- supply and driver circuits. This occurs when all receiver and Technical Brief TB363 “Guidelines for Handling and
transmitter inputs detect no signal transitions for a period of Processing Moisture Sensitive Surface Mount Devices”
30sec. These devices power back up, automatically,
Technical Brief TB379 “Thermal Characterization of
whenever they sense a transition on any transmitter or Packages for ICs” receiver input.
Technical Brief TB389 “PCB Land Pattern Design and
Table 1 summarizes the features of the ISL4238E/4XE, while Surface Mount Guidelines for QFN Packages” Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.
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 registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Page Summary Contents For ISL4244E datasheet for Intel(Intersil) ISL4244E
Manual Details
| Brand | Intel |
|---|---|
| Pages | 17 |
| File Size | 415.90 KB |
| Published | May 30, 2026 |
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Frequently Asked Questions
What is the standby power consumption of these transceivers?
The lowest supply current in powerdown is guaranteed to be only 10nA for both transmitter outputs and receiver inputs.
How do these components save space on a circuit board?
Using the small 5mm x 5mm QFN package, they require 60% less board area than traditional 28 lead TSSOP modules.
Are these devices safe for use in sensitive electronics?
Yes, they feature ±15kV ESD protection and are available as Pb-free options for compliance.
What physical conditions must be monitored during setup?
The devices are highly sensitive to electrostatic discharge (ESD), so following proper IC handling procedures is mandatory.