MAX3317EEUP+

Overview

The MAX3317EEUP+T is a dual RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-pin TSSOP package. It operates on a single +2.25V to +3.0V supply and supports data rates up to 460kbps with full-duplex communication. The device features two drivers and two receivers, consuming only 300µA during operation and dropping to 1µA in shutdown mode when the SHDN pin is driven low. It utilizes a proprietary low-dropout transmitter output stage and requires four 0.1µF capacitors for its internal dual-charge pump voltage converter.

Feature Summary

• AutoShutdown Plus functionality allows automatic entry into a low-power state when no valid signal transitions are detected for over 30 seconds, reducing power consumption without BIOS modifications.
• Integrated dual-charge pump generates regulated +4.4V and -4.3V supplies from a single low-voltage input, eliminating the need for external voltage triplers or switched-mode power supplies.
• RS-232-compatible performance is maintained down to +2.25V, ensuring reliable communication in portable devices powered by single-cell batteries.

Applications

• Palmtop Computers
• Hand-Held Instruments
• Cellular Phones
• GPS Receivers
• Handy Terminals

Procurement Notes

Verify the exact part number against official manufacturer documentation to ensure compatibility with your specific design requirements. Confirm that the component meets all necessary regulatory standards for your target market. Always check the latest datasheet revisions for any updates to electrical characteristics or pin configurations before finalizing procurement decisions.

Selection Notes

Select the MAX3317EEUP+T when designing portable systems requiring low-voltage RS-232 communication with minimal power consumption. Ensure the application environment stays within the specified operating temperature range of -40°C to +85°C. Verify that the system can accommodate the required four 0.1µF capacitors for proper charge pump operation and signal integrity.

Part Context

The MAX3317E is part of the MAX3316–MAX3319 family of 2.5V, 1µA, 460kbps RS-232-compatible transceivers. This series is designed for space-constrained, battery-powered applications where power efficiency is critical. The MAX3317 specifically offers two drivers and two receivers with manual shutdown control via the SHDN pin, distinguishing it from models with AutoShutdown Plus features.

Replacement Considerations

The MAX3316EUP+ serves as a direct functional substitute within the same family, offering identical 2-Tx/2-Rx configuration and electrical specifications. Both components share the same 20-pin TSSOP package and operate under similar voltage and current constraints. Verify pin-to-pin compatibility and thermal requirements before implementing any replacement in an existing design.

FAQ

How does the MAX3317 achieve such low power consumption?

The MAX3317 achieves low power consumption through its proprietary low-dropout transmitter output stage and efficient dual-charge pump design. In normal operation, it draws only 300µA, and this drops to 1µA when the SHDN pin is asserted low, effectively shutting down the charge pumps and transmitter outputs while keeping receivers active.

What is the purpose of the READY output pin?

The READY output pin asserts high when the internal charge pump is regulating and the device has generated sufficient voltage levels to begin transmitting. This signal indicates that the transceiver is fully operational and ready to handle RS-232 data transmission.

Can the MAX3317 operate with standard RS-232 software?

Yes, the MAX3317 guarantees RS-232-compatible performance at data rates up to 460kbps with worst-case loads. It is compatible with PC-to-PC communication software, such as LapLink, allowing it to function properly with most modern RS-232 interfaces despite not meeting all EIA-232 voltage swing requirements under heavy load.