QFN Packaged, ±15kV ESD Protected, +3V to +5.5V, 300nA, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown and a Separate Logic Supply

The Intersil ISL4270E is a 3.0V to 5.5V powered RS-232 transceiver which meets ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. Additionally, it provides 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 enhanced automatic powerdown functions, reduce the standby supply current to a 300nA 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.

Features

• Available in Near Chip Scale QFN (5mmx5mm) Package

• VL Supply Pin for Compatibility with Mixed Voltage Systems

• ESD Protection for RS-232 I/O Pins to 15kV (IEC61000)

• Manual and Enhanced Automatic Powerdown Features

• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V

• On-Chip Charge Pumps Require Only Four External 0.1F Capacitors

• Receivers Stay Active in Powerdown

• Very Low Supply Current . . . . . . . . . . . . . . . . . . . . 300A

• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps

• Wide Power Supply Range . . . . . . . Single +3V to +5.5V

• Low Supply Current in Powerdown State. . . . . . . . 300nA

• Pb-Free (RoHS Compliant)

Applications

• Any System Requiring RS-232 Communication Ports

- Battery Powered, Hand-Held, and Portable Equipment

- Laptop Computers, Notebooks, Palmtops

- Digital Cameras

- PDA’s and PDA Cradles

- Cellular/Mobile Phones