Intersil ISL4221E Manuals

ISL4221E and ISL4223E are Intersil's QFN packaged, +/-15kV ESD protected, +2.7V to +5.5V, 150Nanoamp, 250kBps RS-232 transmitters/receivers.

The ISL3232E and ISL4221E, ISL4223E are 2.7V to 5.5V powered RS-232 transmitters/receivers that meet EIA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. They also provide ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). These devices are suitable for PDAs, Palmtops, and hand-held products where low operational and standby power consumption is critical. The on-chip charge pumps, along with manual and automatic power-down functions, reduce the standby supply current to a trickle of 150nA. The small 5mmx5mm Quad Flat No-Lead (QFN) package and the use of small, low-value capacitors ensure board space savings. Data rates greater than 250kbps are guaranteed under worst-case load conditions. The ISL4221E is a 1 driver, 1 receiver device, while the ISL3232E and ISL4223E are 2 driver, 2 receiver devices, making them suitable for PDAs and hand-held applications. The 5mmx5mm QFN package requires 40% less board area than a 20 Ld TSSOP and is nearly 20% thinner. The ISL4221E and ISL4223E versions feature an automatic power-down function that powers down the on-chip power supply and driver circuits.