MAX3223EPP+

Overview

The MAX3223EPP+ is a dual-driver, dual-receiver RS-232 transceiver in a 20-pin Plastic DIP package. It operates from a single +3.0V to +5.5V supply and features AutoShutdown technology that reduces supply current to 1µA when no valid signal is detected on receiver inputs for 30µs. The device guarantees a 120kbps data rate with worst-case loads of 3kΩ parallel 1000pF, typically supporting up to 235kbps. Internal dual charge pumps generate ±5.5V rails using only four 0.1µF capacitors. Transmitter outputs provide ±5.0V swing, and the INVALID pin indicates active communication status.

Feature Summary

• AutoShutdown functionality automatically disables onboard power supplies and drivers upon detecting invalid receiver input levels, significantly reducing standby power consumption.
• Integrated dual charge pump circuitry generates required RS-232 voltage levels from a single low-voltage supply without external components.
• Transmitters convert CMOS logic levels to standard EIA/TIA-232 voltages while maintaining compatibility with PC-to-PC communication software.

Applications

• Battery-powered equipment requiring extended standby life
• Hand-held devices and portable diagnostics equipment
• Peripherals connecting to serial ports

Procurement Notes

Verify the specific suffix 'P' corresponds to the 20-pin Plastic DIP package variant rather than SSOP or TSSOP alternatives. Confirm the 'E' designation ensures operation across the full industrial temperature range of -40°C to +85°C. Ensure the '+' suffix aligns with current RoHS compliance requirements before finalizing procurement specifications.

Selection Notes

Select this component when a through-hole 20-pin DIP form factor is required for board layout constraints. Choose the MAX3223 over the MAX3221 if two independent transmit/receive channels are necessary. Verify that the 120kbps guaranteed data rate meets system timing requirements compared to higher-speed interface options.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. While the MAX3221 offers a single channel and the MAX3243 provides three drivers with mouse driveability, the MAX3223 specifically addresses applications needing two full-duplex channels within a compact footprint.

Replacement Considerations

MAX3223CPP serves as the commercial temperature grade equivalent (-40°C to +85°C vs 0°C to +70°C). For surface-mount implementations, MAX3223EAP (SSOP) and MAX3223EUP (TSSOP) offer identical electrical performance in different physical packages.

FAQ

How does the AutoShutdown feature determine when to enter low-power mode?

The device enters AutoShutdown mode after 30µs of no valid signal level being present on all receiver inputs, shutting down the onboard power supply and drivers to achieve 1µA supply current.

What capacitor values are required for 3.3V operation?

For 3.3V operation, the datasheet specifies using 0.1µF capacitors for C1 through C4 to support the internal charge pump circuitry.

Can the MAX3223 directly interface with 5V logic families?

Yes, the device can directly interface with various 5V logic families, including ACT and HCT CMOS, when operating at a VCC of 5V.