MAX3223EAP

Overview

The MAX3223EAP is a dual driver/receiver RS-232 transceiver in a 20-pin SSOP package. It operates from a single +3.0V to +5.5V supply and features AutoShutdown technology, reducing 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, though typical operation reaches 235kbps. Internal dual charge pumps generate ±5.5V rails using only four 0.1µF capacitors at 3.3V. Logic thresholds are compatible with 3.3V and 5V CMOS families.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling the onboard power supply and drivers when valid RS-232 signals are absent.
• Integrated dual charge pump circuitry eliminates the need for external ±12V supplies, enabling operation from a single low-voltage source.
• Transmitters provide true RS-232 performance levels directly from low-voltage logic interfaces without requiring additional driving circuits.

Applications

• Battery-powered equipment
• Hand-held devices
• Portable diagnostics equipment

Procurement Notes

Verify the specific suffix 'AP' corresponds to the 20-pin SSOP package and -40°C to +85°C temperature range. Confirm RoHS compliance status via the manufacturer's ordering information table. Ensure the component matches the exact pinout configuration required for the target PCB layout before finalizing procurement.

Selection Notes

Select this component when designing systems requiring full-duplex RS-232 communication with minimal standby power consumption. It is suitable for applications where space constraints favor surface-mount packaging over through-hole alternatives. Verify that the system logic voltage aligns with the supported 3.3V or 5V input ranges.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V to 5.5V RS-232 transceivers. The MAX3223 variant specifically provides two drivers and two receivers, distinguishing it from the single-channel MAX3221 and the multi-channel MAX3243. All members share the same core AutoShutdown architecture and internal charge pump design.

Replacement Considerations

MAX3223ECAP+ (Analog Devices/Maxim Integrated) offers identical electrical specifications and pinout compatibility within the same SSOP-20 package format.

FAQ

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

The device enters AutoShutdown mode if no valid RS-232 signal levels are present on all receiver inputs for a duration of 30µs. It wakes up automatically when a valid level is applied to any receiver input.

What capacitor values are required for 3.3V operation?

For 3.3V operation, the datasheet specifies using 0.1µF capacitors for C1, C2, C3, and C4.

Can the MAX3223EAP interface directly with 5V logic families?

Yes, the device can directly interface with various 5V logic families, including ACT and HCT CMOS, as well as standard TTL logic.