TI MAX3318IDBR

The MAX3318 is a dual-driver, dual-receiver, RS-232 compatible transceiver. The device features autopower-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 61000-4-2 Air-Gap Discharge method, ±8 kV using the IEC 61000-4-2 Contact Discharge method, and ±15 kV using the HumanBody 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 MAX3318 achieves a 1-μA 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 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 power down 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 TSSOP.

• ESD Protection for RS-232 I/O Pins – ±15 kV (Human-Body Model) ±8 kV (IEC 61000-4-2, Contact Discharge) ±8 kV (IEC 61000-4-2, Air-Gap Discharge)
• 300-μA Operating Supply Current
• 1-μA 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

• Battery-Powered Systems
• PDAs
• Cellular Phones
• Notebooks
• Hand-Held Equipment Pagers