NM232DDC

Drivers, Receivers, Transceivers Overview

The NM232DDC is an electrically isolated dual transmitter and receiver designed to interface data terminal equipment (DTE) with data communications equipment (DCE). It provides two receive channels and two transmit channels, compatible with EIA-232-D/E and CCITT V.28 standards at the interface boundary, while maintaining TTL/CMOS compatibility on logic connections. The device operates from a single 5V supply (4.5V to 5.5V) and requires no external components. Key electrical parameters include a maximum transmission rate of 9.6 kbps, a supply current of 53 mA during operation, and a shutdown current of 10 μA. Isolation characteristics feature a 1.5kVrms test voltage for one second.

Drivers, Receivers, Transceivers Feature Summary

• Provides galvanic isolation between logic side and RS-232 interface to eliminate ground loop currents.
• Integrates dual transmitters and receivers in a self-contained package without requiring external DC/DC converters.
• Includes low-power shutdown mode and high-impedance output states controlled via dedicated pins.

Drivers, Receivers, Transceivers Applications

• Isolated serial communication interfaces between UARTs and DTE/DCE connectors.
• Creating multi-drop communication buses where multiple devices share a single UART via logical addressing.
• Industrial environments requiring noise immunity and protection against ground potential differences.

Drivers, Receivers, Transceivers Procurement Notes

Verify component authenticity through authorized Murata Power Solutions distributors or certified secondary market vendors. Request original manufacturer documentation and traceability records upon order confirmation. Inspect physical packaging for damage and confirm pin alignment matches the specified 24-pin DIP outline before integration into production workflows.

Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring robust isolation between digital logic and RS-232 lines without external power conversion stages. Ensure the application data rate does not exceed 9.6 kbps due to internal propagation delays. Verify that the operating temperature range of 0°C to 70°C aligns with the environmental conditions of the target deployment site.

Drivers, Receivers, Transceivers Part Context

The NM232DDC belongs to the NM232DDC Series of isolated interface devices manufactured by Murata Power Solutions. It serves as a specialized solution for bridging microprocessor-based logic circuits with standard serial communication ports while maintaining electrical safety barriers.

Drivers, Receivers, Transceivers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative isolated RS-232 transceivers based on matching isolation voltage ratings, pin configurations, and thermal performance specifications.

Drivers, Receivers, Transceivers FAQ

What is the maximum continuous voltage allowed across the isolation barrier?

For parts without specific agency approvals like the NM232DDC, input and output should normally be maintained within SELV limits, specifically less than 42.4V peak or 60VDC.

How does the ENABLE pin function?

Setting the ENABLE input (pin 11) to a high level places the receiver outputs (pins 1 and 12) into a high-impedance state, allowing for bus sharing configurations.

Is repeated high-voltage testing recommended?

No, repeated high-voltage isolation testing is strongly advised against as it can degrade the toroidal transformer insulation. If testing is required, reduce the voltage by 20% from the specified test value.