The ISL83385E is an Intersil-produced 3.0V to 5.5V powered RS-232 transmitter/receiver that meets EIA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. It is mainly used in PDAs, Palmtops and notebook and laptop computers that require low power consumption. The device employs an efficient on-chip charge pump and a manual power-down function to reduce standby supply current to 1µA. The small footprint packaging and the use of small, low-value capacitors also save board space. Under the worst-case load conditions, data rates greater than 250kbps are guaranteed. This device is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only systems. The single-pin power-down function (SHDN = 0) disables all the transmitters, while shutting down the charge pump to minimize supply current drain. Table 1 summarizes the features of the ISL83385E, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.
The ISL83385E is a 3.0 V – 5.5 V powered RS‑232 transceiver/receiver that meets EIA/TIA‑232 and V.28/V.24 specifications. It offers +15 kV ESD protection, a single‑pin shutdown function, and low standby current, making it suitable for battery‑powered handheld devices, laptops, and other portable equipment.
The document includes detailed pin descriptions, typical operating circuits, absolute maximum ratings, electrical and timing specifications, and guidance on capacitor selection, power‑down operation, and logic‑family compatibility. Package dimensions for SOIC and SSOP versions are also provided.
| Supply Voltage Range | 3.0 V to 5.5 V |
|---|---|
| Supply Current (Power‑down) | <1 µA |
| ESD Protection (RS‑232 pins) | +15 kV |
| Slew Rate | 6 V/µs |
| Maximum Junction Temperature | 150 °C |
Driving the SHDN pin low disables all transmitters and shuts down the on‑chip charge pump, reducing supply current to microamp levels.
The RS‑232 I/O pins are protected against up to +15 kV ESD events.