M-8870-02SMTR

Telecom Overview

The M-8870-02SMTR is a full DTMF receiver manufactured by IXYS Integrated Circuits Division (Clare) in an 18-pin plastic SOIC tape and reel package. It integrates bandsplit filters and a digital decoder to detect and decode all 16 DTMF tone pairs into a 4-bit code. The device operates on a single 5V supply with typical operating current of 3.0 mA and maximum power consumption of 35 mW. It features adjustable acquisition and release times, dial tone suppression, and a low-cost 3.579545 MHz time base. The -02 variant includes power-down and inhibit modes.

Telecom Feature Summary

• Integrates switched capacitor bandsplit filters and digital decoding logic for precise data handling.
• Includes power-down and inhibit modes to minimize standby power consumption.
• Features a tri-state output bus and internal differential input amplifier.
• Provides dial tone rejection and immunity to extraneous signals.

Telecom Applications

• Telephone switch equipment
• Remote data entry systems
• Paging systems

Telecom Procurement Notes

Verify the specific ordering suffix SMTR confirms the 18-pin plastic SOIC package and tape and reel packaging format. Confirm that the -02 designation is present to ensure the inclusion of power-down and inhibit mode functionality on pins 5 and 6. Cross-reference the manufacturer part number against official Clare or IXYS documentation to validate component authenticity.

Telecom Selection Notes

Select this component when a complete DTMF receiver solution is required with minimal external parts. The -02 version is necessary if system design requires active power-down control or inhibition of the fourth column digits. Ensure the application can accommodate the 3.579545 MHz crystal requirement and the 18-pin SOIC footprint constraints.

Telecom Part Context

The M-8870 series consists of CMOS DTMF receivers designed for telecommunications applications. The M-8870-02SMTR represents the surface-mount variant of the -02 model, which adds control features not found in the standard M-8870-01. This family utilizes switched capacitor technology to replace traditional analog filter components, reducing board space and cost.

Telecom Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.

Telecom FAQ

How does the M-8870-02 handle power consumption during standby?

Applying a logic high to pin 6 (PD*) places the device into standby mode, dropping power consumption to less than 0.5 mW by stopping the oscillator and filter functions.

What is the function of the INH* pin on the M-8870-02?

Pin 5 (INH*) inhibits the detection of tones representing keys A, B, C, and D (1633 Hz). When held high, the output code remains the same as the previously detected code.

What clock frequency is required for the M-8870-02SMTR?

The device requires a 3.579545 MHz color burst crystal connected between pins 7 (OSC1) and 8 (OSC2) to complete the internal oscillator circuit.