廬
ISL4241E, ISL4243E
Data Sheet
May 2004
FN8037.4
QFN Packaged, 鹵15kV ESD Protected,
+2.7V to +5.5V, 10Nanoamp, 250kbps,
RS-232 Transmitters/Receivers
The Intersil ISL424XE devices are 2.7V 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
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 automatic powerdown functions, reduce the
standby supply current to a 10nA 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 ISL424XE are 3 driver, 5 receiver devices that, coupled
with the 5x5 QFN package, provide the industry鈥檚 smallest,
lowest power complete serial port suitable for PDAs, and
laptop or notebook computers. The 5x5 QFN requires 60%
less board area than a 28 lead TSSOP, and is nearly 20%
thinner. The devices also include a noninverting always-
active receiver for 鈥渨ake-up鈥?capability.
The
ISL4243E
features an
automatic powerdown
function
that 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. It powers up again when a valid RS-232
voltage is applied to any receiver input.
Table 1 summarizes the features of the ISL424XE, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
Features
鈥?/div>
Pb-free Available as an Option
鈥?Parameters Fully Specified for 10% Tolerance Supplies
and Full Industrial Temp Range
鈥?Available in Small QFN (5mm x 5mm) Package which is
60% Smaller than a 28 Lead TSSOP
鈥?ESD Protection for RS-232 I/O Pins to
鹵
15kV (IEC61000)
鈥?Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
鈥?RS-232 Compatible with V
CC
= 2.7V
鈥?On-Chip Voltage Converters Require Only Four External
0.1碌F Capacitors
鈥?Manual and Automatic Powerdown Features
鈥?Receiver Hysteresis For Improved Noise Immunity
鈥?Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
鈥?Wide Power Supply Range. . . . . . . Single +2.7V to +5.5V
鈥?Low Supply Current in Powerdown State . . . . . . . . . .10nA
Applications
鈥?Any Space Constrained System Requiring RS-232 Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks
- PDAs and Palmtops, Data Cables
- Cellular/Mobile Phones, Digital Cameras, GPS
Receivers
Related Literature
鈥?Technical Brief TB363 鈥淕uidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
鈥?鈥漈echnical Brief TB379 鈥淭hermal Characterization of
Packages for ICs鈥?/div>
鈥?Technical Brief TB389 鈥淧CB Land Pattern Design and
Surface Mount Guidelines for QFN Packages鈥?/div>
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL4241E
ISL4243E
NO. OF
MONITOR Rx.
NO. OF NO. OF
QFN PKG.
(R
OUTB
)
Tx.
Rx.
AVAILABLE?
3
3
5
5
YES
YES
2
1
DATA
RATE
(kbps)
250
250
Rx. ENABLE
FUNCTION?
YES
NO
READY
OUTPUT?
NO
NO
MANUAL
POWER-
DOWN?
YES
YES
AUTOMATIC
POWERDOWN
FUNCTION?
NO
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. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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