ISL3241E_14 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

QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V,
250kbps, RS-232 Transmitters/Receivers with
Separate Logic Supply Pin
ISL3241E, ISL3243E
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”
PART NUMBER
ISL3241E
ISL3243E
NO. OF
Tx.
3
3
NO. OF LOGIC SUPPLY
Rx.
(V_L) PIN?
5
YES
5
YES
TABLE 1. SUMMARY OF FEATURES
NO. OF
MONITOR Rx.
(R_OUTB)
2
DATA RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
YES
1
250
NO
Pb-FREE?
YES
YES
MANUAL
POWER-
DOWN?
YES
YES
AUTOMATIC
POWERDOWN
FUNCTION?
NO
YES
June 18, 2012
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
FN6768.2
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2008, 2010, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.