MAX3318

` ESD Protection for RS-232 I/O Pins
` Notebooks
±15 kV (Human-Body Model)
` Hand-Held Equipment
±8 kV (IEC 61000, Contact Discharge)
` Pagers
±8 kV (IEC 61000, Air-Gap Discharge)
` 300-mA Operating Supply Current
` 1-mA Low-Power Standby (With Receivers Active) Mode
` Designed to Transmit at a Data Rate of 460 kbps
` Auto-Power-Down Plus Option Features Flexible Power-Saving Mode
` Operates From a Single 2.25-V to 3-V VCC Supply
` Cellular Phones

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) V+ and V can have maximum magnitudes of 7 V, but their absolute difference cannot exceed 13 V.

The MAX3318 is a dual-driver, dual-receiver, RS-232 compatible transceiver. The device features auto-power-down plus and enhanced electrostatic discharge (ESD) protection integrated into the chip. Driver output and receiver input are protected to ±8 kV using the IEC 61000 Air-Gap Discharge method, ±8 kV using the IEC 61000 Contact Discharge method, and ±15 kV using the Human-Body Model (HBM).

The MAX3318 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 equires only four 0.1-mF 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 MAX3318 achieves a 1-mA supply current using the auto-power-down feature. This device automatically enters a low-power power-down mode when the RS-232 cable is disconnected or the drivers of the connected eripherals are inactive for more than 30 s. The device turns on again when it senses a valid transition at any river or receiver input. Auto power down saves power without changes to the existing BIOS or operating system.

This MAX3318 is available in two space-saving packages: 20-pin SSOP and 20-pin TSSOP.