MAX3318CUP+

Overview

The MAX3318CUP+ is a dual-transmitter, dual-receiver RS-232-compatible transceiver 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 requiring only four 0.1µF capacitors. The device guarantees data rates up to 460kbps and features AutoShutdown Plus technology, which reduces supply current to 1µA when the cable is disconnected or peripherals are inactive for over 30 seconds. It includes logic-level outputs such as READY and INVALID to indicate charge pump regulation and valid signal presence. 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 feature automatically enters low-power shutdown mode upon detecting inactivity or disconnection
• Proprietary low-dropout transmitter output stage enables RS-232 compatibility at low voltages
• Dual-charge pump voltage converter generates internal supplies using minimal external capacitance
• Logic-level outputs provide status indication for charge pump regulation and receiver input validity

Applications

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

Procurement Notes

Verify the ordering suffix 'C' indicates the commercial temperature range of 0°C to +70°C. Confirm the '+'' suffix denotes lead-free packaging compliant with RoHS standards. Ensure the 20-pin TSSOP package matches the design footprint. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability and authenticity before procurement.

Selection Notes

Select this component for applications requiring RS-232 communication powered by a single low-voltage source between 2.25V and 3.0V. It is suitable for designs needing automatic power management without BIOS modifications. Verify that the required data rate does not exceed 460kbps. Ensure the system environment remains within the commercial temperature limits specified for the 'C' grade variant.

Part Context

This device belongs to the MAX3316–MAX3319 family of 2.5V, 1µA, 460kbps RS-232-compatible transceivers. The MAX3318 specifically provides two drivers and two receivers, distinguishing it from the single-channel MAX3319. The family shares common architecture features including the dual-charge pump and AutoShutdown Plus functionality, designed for space-constrained portable electronics.

Replacement Considerations

Public confirmed substitute part numbers include MAX3318EUP and MAX3318CAP. These variants offer identical electrical functionality but differ in temperature ranges and packages. Verify pin compatibility and capacitor requirements when substituting.