|Category||Analog & Mixed-Signal Processing|
|Description||QFN Packaged, 15kV Esd Protected, +3V to +5.5V, 150nA, 250kbps, RS-232 Transmitters/receivers With Separate Logic Supply|
|Datasheet||Download ISL4260E datasheet
QFN Packaged, ±15kV ESD Protected, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply
The ISL4260E contains to 5.5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. Targeted applications are PDAs, Palmtops, and cell phones where the low operational, and even lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with a manual powerdown function reduces the standby supply current a 150nA trickle. Tiny x 5mm Quad Flat NoLead (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 ISL4260E features a VL pin that adjusts the logic pin (see Pin Descriptions table) output levels and input thresholds to values compatible with the VCC powering the external logic (e.g., a UART). The single pin powerdown function (SHDN = 0) disables all the receiver and transmitter outputs, while shutting down the charge pump to minimize supply current drain. Table 1 summarizes the features of the ISL4260E, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.Features
Available in Near Chip Scale QFN (5mmx5mm) Package VL Pin for Compatibility with Mixed Voltage Systems ESD Protection for RS-232 I/O Pins ±15kV (IEC61000) Single SHDN Pin Disables Transmitters and Receivers Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V On-Chip Charge Pumps Require Only Four External 0.1µF Capacitors Receiver Hysteresis For Improved Noise Immunity Very Low Supply Current. 300µA Guaranteed Minimum Data Rate. 250kbps Wide Power Supply Range. Single to +5.5V Low Supply Current in Powerdown State.150nAApplications
Any System Requiring RS-232 Communication Ports - Battery Powered, Hand-Held, and Portable Equipment - Laptop Computers, Notebooks, Palmtops - Digital Cameras - PDAs and PDA Cradles - Cellular/Mobile Phones
PART NUMBER ISL4260EIR ISL4260EIR-T TEMP. RANGE (oC) to 85 PACKAGE 32 Lead QFN 32 Lead QFN Tape & Reel PKG. NO. L32.5x5
TABLE 1. SUMMARY OF FEATURES PART NUMBER ISL4260E NO. OF NO. OF DATA RATE Rx. ENABLE Tx. Rx. (kbps) FUNCTION? NO VL LOGIC SUPPLY PIN? YES MANUAL AUTOMATIC POWER- DOWN? POWERDOWN FUNCTION? YES NO
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved
PIN VCC V+ VGND C1C2+ C2TIN TOUT RIN ROUT VL SHDN NC System power supply input to 5.5V). Internally generated positive transmitter supply (+5.5V). Internally generated negative transmitter supply (-5.5V). Ground connection. External capacitor (voltage doubler) is connected to this lead. External capacitor (voltage doubler) is connected to this lead. External capacitor (voltage inverter) is connected to this lead. External capacitor (voltage inverter) is connected to this lead. TTL/CMOS compatible transmitter Inputs. The switching point is a function of the VL voltage. ±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs. ±15kV ESD Protected, RS-232 compatible receiver inputs. TTL/CMOS level receiver outputs. Swings between GND and VL. Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. Active low TTL/CMOS input to tri-state receiver and transmitter outputs and to shut down the on-board power supply to place device in low power mode. The switching point is a function of the VL voltage. No Connection FUNCTION
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