ISL3241E Datasheet, PDF (1/16 Pages) Intersil Corporation – QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin

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Data Sheet
ISL3241E, ISL3243E
May 13, 2010
FN6768.1
QFN Packaged, ±15kV ESD Protected,
+2.7V to +3.6V, 250kbps, RS-232
Transmitters/Receivers with Separate
Logic Supply Pin
The Intersil ISL324xE devices are 2.7V to 3.6V 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 ±15kV ESD protection (IEC61000-4-2 Air Gap
and Human Body Model) on transmitter outputs and receiver
inputs (RS-232 pins). Targeted applications are POS
systems, 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 0.5µA trickle. Tiny 5mmx5mm 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.
ISL324xE are 3 driver, 5 receiver devices that, coupled with
the 5x5 QFN package, provide the industry’s smallest,
lowest power complete serial port. The 5x5 QFN requires
60% less board area than a 28 Ld TSSOP, and is nearly
20% thinner. These devices also include a noninverting
always-active receiver for “wake-up” capability.
The ISL3243E 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.
The ISL324xE feature a V_L pin that adjusts the logic pin (see
“Pin Descriptions” on page 2) output levels and input
thresholds to values compatible with the V_CC powering the
external logic (e.g., a UART).
Table 1 summarizes the features of the ISL324xE.
Features
• V_L Pin for Compatibility in Mixed Voltage Systems
Adjusts Logic Output Levels and Input Thresholds for
Compatibility with Lower Supply Voltage Logic
• Parameters Specified for 10% Tolerance Supplies and Full
Industrial Temp Range
• Pb-free Small QFN (5mmx5mm) Package is 60% Smaller
than a 28 Lead TSSOP
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• RS-232 Compatible with V_CC = 2.7V
• 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
• Low Supply Current in Power-down State . . . . . . . . 0.5µA
• Pb-Free (RoHS compliant)
Applications
• Any Space Constrained System Requiring RS-232 Ports
- Battery Powered, Hand-Held, and Portable Equipment
- POS Systems and Scanners
- Laptop Computers, Notebooks
- GPS Receivers
• Mixed Voltage Serial Ports
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
• ”Technical Brief TB379 “Thermal Characterization of
Packages for ICs”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
TABLE 1. SUMMARY OF FEATURES
NO. OF
PART NUMBER Tx.
ISL3241E
3
NO. OF
Rx.
5
LOGIC
SUPPLY (V_L)
PIN?
YES
NO. OF
MONITOR Rx.
(R_OUTB)
2
DATA
RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
YES
ISL3243E
3
5
YES
1
250
NO
Pb-FREE?
YES
YES
MANUAL
POWER-
DOWN?
YES
YES
AUTOMATIC
POWERDOWN
FUNCTION?
NO
YES
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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