4423P

Overview

The Texas Instruments 4423P is a dual differential line driver integrated circuit belonging to the RS-422 interface family. It features two independent drivers capable of transmitting data at rates up to 10 Mbps over balanced transmission lines. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a load capacitance of up to 2500 pF. Designed for robust communication, it provides high noise immunity and fault protection against open or shorted outputs. The component is housed in a standard 14-pin PDIP package.

Feature Summary

• Dual differential line drivers supporting RS-422 standards
• Data transmission rates up to 10 Mbps
• High noise immunity with fault protection for open/shorted loads
• Operates on a single 5 V power supply (4.75 V to 5.25 V)

Applications

• Industrial control systems requiring reliable serial communication
• Point-to-point or multi-drop data transmission networks
• Communication interfaces in noisy electrical environments

Procurement Notes

The 4423P carries an NRND (Not Recommended for New Designs) status from Texas Instruments. While the device remains in production to support existing customers, it is not recommended for inclusion in new designs. Engineers should verify current availability and consider alternative components for future projects.

Selection Notes

Select this component only for maintenance or upgrade of legacy systems utilizing the 4423P. For new designs, evaluate active Texas Instruments RS-422 transceivers that offer improved performance metrics or lower power consumption. Ensure the application requires the specific 14-pin PDIP form factor before proceeding.

Part Context

This part belongs to the broader category of Texas Instruments RS-422 interface integrated circuits. These devices are designed to replace older TTL logic families for long-distance serial communication. The 4423P specifically serves as a dual driver variant within this lineup, providing differential signaling capabilities essential for industrial data buses.

Replacement Considerations

As an NRND component, direct replacements may require schematic adjustments. Verify pin compatibility with newer dual RS-422 drivers from the same manufacturer or competitors. Check for equivalent speed ratings and voltage tolerances to ensure system integrity during migration.