The TRS3318E is a dual-driver, dual-receiver, RS-232-compatible transceiver. The device
features auto-powerdown plus and enhanced electrostatic discharge (ESD) protection integrated into
the chip. Driver output and receiver input are protected to ±15 kV using the IEC 61000-4-2 Air-Gap
Discharge method, ±8 kV using the IEC 61000-4-2 Contact Discharge method, and ±15 kV using the
Human-Body Model (HBM).
The device operates at a data rate of 460 kbps. The transceiver has a proprietary
low-dropout driver output stage, enabling RS-232-compatible operation from a 2.25-V to 3-V supply
with a dual charge pump. The charge pump requires only four 0.1-µF capacitors and features a
logic-level output (READY) that asserts when the charge pump is regulating and the device is ready
to begin transmitting.
The TRS3318E achieves a 1-µA supply current using the auto-powerdown feature. This device
automatically enters a low-power power-down mode when the RS-232 cable is disconnected or the
drivers of the connected peripherals are inactive for more than 30 s. The device turns on again
when it senses a valid transition at any driver or receiver input. Auto-powerdown saves power
without changes to the existing BIOS or operating system.
This device is available in two space-saving packages: 20-pin SSOP and 20-pin
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