The MAX3318ECPW 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 ±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 MAX3318ECPW 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.
Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-power-down plus feature functions when FORCEON is low and INVALID is low (invalid data) if all receiver input voltage are between –0.3 V and 0.3 V for more than 30 μs (typical number).
Feature
- ESD Protection for RS-232 I/O Pins
- ±15 kV (Human-Body Model)
- ±8 kV (IEC 61000-4-2, Contact Discharge)
- ±15 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 Flexible Power-Saving Mode
- Operates From a Single 2.25-V to 3-V VCC Supply