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.
The ISL3232E, ISL4221E and ISL4223E are low‑power RS‑232 transceiver ICs that operate from a single 2.7 V to 5.5 V supply. They provide +15 kV ESD protection, meet EIA/TIA‑232 specifications, and are offered in a compact 5 mm × 5 mm QFN package, making them suitable for space‑constrained handheld devices.
Key features include automatic and manual power‑down modes that reduce standby current to 150 nA, a guaranteed minimum data rate of 250 kbps, and a simple pin configuration with four external 0.1 pF capacitors for the on‑chip charge pumps. The datasheet also contains mechanical dimensions, ordering information, and detailed electrical specifications.
| Supply Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Minimum Data Rate | 250 kbps |
| Power‑down Current | 150 nA |
| ESD Protection | +15 kV (IEC61000) |
| Package Size | 5 mm × 5 mm QFN |
They operate from 2.7 V to 5.5 V.
The devices guarantee a minimum data rate of 250 kbps.
Standby current drops to 150 nA.
The pins are protected up to +15 kV according to IEC61000.