MAX3318EIPWR

Overview

The MAX3318EIPWR is a dual-driver, dual-receiver RS-232 transceiver manufactured by Texas Instruments. It operates from a single 2.25-V to 3-V supply and supports data rates up to 460 kbps. The device integrates a dual charge pump requiring only four 0.1-μF capacitors. It features ±15-kV ESD protection on RS-232 I/O pins using the IEC 61000-4-2 Air-Gap Discharge method. Supply current is 300 μA during operation and reduces to 1 μA in low-power standby mode with receivers active. The component is housed in a 20-pin TSSOP package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrated auto-power-down plus feature that reduces supply current to 1 μA when drivers are inactive for approximately 30 seconds.
• Robust electrostatic discharge (ESD) protection rated at ±15 kV (Air-Gap), ±8 kV (Contact Discharge), and ±15 kV (Human-Body Model).
• Proprietary low-dropout driver output stage enabling RS-232-compatible operation from a single low-voltage supply.
• Logic-level READY output signal indicating when the internal charge pump is regulating and the device is ready for transmission.

Applications

• Battery-powered portable systems such as PDAs and cellular phones.
• Notebook computers and hand-held equipment.
• Industrial pagers and other battery-operated communication devices.

Procurement Notes

Verify the specific ordering suffix 'IPWR' corresponds to the TSSOP-20 package variant with industrial temperature ratings (-40°C to +85°C). Confirm RoHS compliance status and lead finish specifications via the latest TI Package Option Addendum before procurement. Ensure the source document matches the SLLS741A datasheet revision for accurate pinout and electrical parameter validation.

Selection Notes

Select this component for applications requiring full-duplex RS-232 communication under strict power constraints. The device is suitable where a single low-voltage supply (2.25 V to 3 V) is available, eliminating the need for external negative voltage generators. Consider the 460 kbps maximum data rate and the specific ESD protection requirements for the target interface environment.

Part Context

The MAX3318EIPWR belongs to the MAX3318E family of RS-232 transceivers designed for low-voltage operation. It shares functional similarities with other Maxim Integrated/Texas Instruments RS-232 parts but is distinct in its specific 2.25-V to 3-V supply range and integrated auto-power-down plus logic. The 'IPWR' designation identifies the industrial temperature grade and tape-and-reel packaging format.

Replacement Considerations

The TRS3318ECPWR is a related Texas Instruments part offering similar functionality but with commercial temperature limits (0°C to 70°C). Verify if the extended industrial temperature range of the MAX3318EIPWR is required for the specific application environment before substituting.