MAX3317CUP+T

Overview

The MAX3317CUP+T is a dual RS-232 transceiver from the MAX3316–MAX3319 family, manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +2.25V to +3.0V supply and utilizes a proprietary low-dropout transmitter output stage with a dual-charge pump voltage converter. The device provides two drivers and two receivers for full-duplex communication at guaranteed data rates up to 460kbps. It features a 1µA shutdown mode accessible via the SHDN pin, during which receivers remain active. The component is housed in a 20-pin TSSOP package and supports an operating temperature range of 0°C to +70°C.

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 pumps generate internal ±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 while minimizing electromagnetic interference through slew-rate limiting.

Applications

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

Procurement Notes

Verify the specific suffix 'CUP+' against the manufacturer's current ordering guide to confirm the exact temperature grade (commercial vs. extended) and RoHS compliance status. Ensure that the 20-pin TSSOP footprint matches your PCB design constraints. Cross-reference the datasheet revision date to confirm any updates to electrical characteristics or recommended capacitor values before finalizing procurement.

Selection Notes

Select this component when designing portable systems requiring RS-232 connectivity under strict power constraints. The MAX3317 is suitable for applications needing two independent channels where manual shutdown control via the SHDN pin is preferred over the automatic AutoShutdown Plus feature found in the MAX3318/MAX3319 variants. Ensure the system voltage remains within the 2.25V to 3.0V range for optimal operation.

Part Context

The MAX3317CUP+T belongs to the MAX3316–MAX3319 series of 2.5V RS-232 transceivers. This family shares a common architecture featuring low-dropout transmitters and dual charge pumps. The MAX3317 specifically distinguishes itself by offering manual shutdown control while keeping receivers active, unlike the MAX3316 which lacks shutdown, or the MAX3318/MAX3319 which utilize AutoShutdown Plus.

Replacement Considerations

Direct functional substitutes within the same package include the MAX3316EUP+T and MAX3318EUP+T. Note that the MAX3316 lacks shutdown capability, while the MAX3318 replaces manual shutdown with AutoShutdown Plus logic. Verify pin compatibility and software configuration requirements when migrating between these variants.