MAX3319CAE+

Overview

The MAX3319CAE+ is a single-transmitter, single-receiver RS-232-compatible transceiver designed for low-voltage systems. It operates from a +2.25V to +3.0V supply and achieves a guaranteed data rate of 460kbps using a dual-charge pump with only four 0.1µF capacitors. The device features AutoShutdown Plus technology, reducing supply current to 1µA when idle. It includes a READY output indicating charge pump regulation status and an INVALID output detecting valid RS-232 levels. Packaged in a 16-pin SSOP, it supports full-duplex communication within the -40°C to +85°C temperature range.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by entering a low-power shutdown mode when no signal transitions are detected for over 30 seconds.
• Proprietary low-dropout transmitter output stage enables RS-232-compatible performance at supply voltages as low as +2.25V.
• Integrated logic-level outputs provide system status: READY indicates charge pump regulation readiness, while INVALID detects valid RS-232 voltage levels on receiver inputs.

Applications

• Palmtop Computers
• Hand-Held Instruments
• Cellular Phones

Procurement Notes

Verify the specific suffix 'AE' corresponds to the 16-pin SSOP package and the '-40°C to +85°C' industrial temperature range. Confirm that the '+T' or '+' designation aligns with lead-free RoHS compliance requirements for your assembly process. Cross-reference the manufacturer's latest ordering guide to ensure pinout compatibility with existing PCB footprints before finalizing procurement.

Selection Notes

Select this component when designing battery-powered portable devices requiring minimal external capacitance and ultra-low standby current. The MAX3319 is suitable for applications needing only one transmitter and one receiver channel. Ensure the system power supply remains within the +2.25V to +3.0V range to maintain guaranteed RS-232 compatibility and data rates up to 460kbps without additional voltage regulation stages.

Part Context

The MAX3319 belongs to the MAX3316–MAX3319 family of 2.5V RS-232 transceivers. While the MAX3316 and MAX3318 offer two drivers and two receivers, the MAX3319 provides a simplified single-channel solution. This family utilizes Maxim’s AutoShutdown Plus feature to optimize power efficiency in portable electronics, distinguishing it from traditional RS-232 interfaces that require higher voltage supplies.

Replacement Considerations

Public confirmed substitute part numbers include MAX3319EAE (Industrial Temp Range) and MAX3319CAP (Commercial Temp Range). These variants share identical electrical characteristics and pinouts but differ in operating temperature specifications and package options.

FAQ

How does the AutoShutdown Plus feature function?

The MAX3319 enters a low-power shutdown mode if FORCEOFF is high, FORCEON is low, and no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds. It wakes up automatically upon sensing a valid transition.

What is the purpose of the INVALID output?

The INVALID output is asserted low when no valid RS-232 voltage levels have been detected on all receiver inputs. It indicates the receiver's input condition and is independent of the FORCEON and FORCEOFF states.

Can the MAX3319 operate with standard RS-232 software?

Yes, the device guarantees a 460kbps data rate with worst-case loads, providing compatibility with PC-to-PC communication software such as LapLink.