LM567CMX/NOPB

Telecom Overview

The LM567CMX/NOPB is a tone decoder integrated circuit manufactured by Texas Instruments, belonging to the LM567C series. It operates within a supply voltage range of 4.75V to 9V and draws a typical supply current of 12mA. The device supports a maximum frequency of 500kHz and has a power dissipation rating of 1.1W. Designed for surface-mount applications, it is housed in an 8-SOIC package with a width of 3.90mm. The component functions as a single-channel voice decoder suitable for telecommunication interfaces, operating reliably across a temperature range of 0°C to +70°C.

Telecom Feature Summary

• Integrates a phase-locked loop (PLL) system specifically configured for tone decoding applications
• Provides a TTL-compatible open-collector output for direct interfacing with digital logic circuits
• Features a wide supply voltage operating range to accommodate various power supply conditions

Telecom Applications

• Telecommunication interface systems requiring voice signal decoding
• Frequency shift keying (FSK) demodulation circuits
• Tone detection and signaling systems in communication equipment

Telecom Procurement Notes

Verify the specific suffix NOPB indicates lead-free compliance and RoHS standards when sourcing. Confirm the SOIC-8 package dimensions match the target PCB footprint. Ensure the operating environment remains within the specified 0°C to +70°C temperature range for optimal performance. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Telecom Selection Notes

Select this component when a dedicated tone decoder with PLL functionality is required for FSK or audio signaling. Compare against through-hole variants like the LM567CN if surface-mount assembly is not feasible. Consider the 1.1W power dissipation limit when designing thermal management solutions. Verify that the 4.75V to 9V supply range aligns with the system's available power rails.

Telecom Part Context

This part is part of the broader LM567 family of tone decoders, which are widely used in analog communication circuits. The CMX variant specifically denotes the surface-mount SOIC packaging option, distinguishing it from the PDIP versions. The NOPB suffix confirms the absence of halogenated flame retardants and lead-free construction, adhering to modern environmental regulations.

Telecom Replacement Considerations

Direct pin-to-pin replacements include other LM567CMX variants from Texas Instruments. Generic CMOS tone decoders may require significant circuit redesign due to different pinouts and electrical characteristics. Verify compatibility with existing PLL filter components before substituting.