M-8880-01T

Telecom Overview

The M-8880-01T is a complete Dual-Tone Multi-Frequency (DTMF) transceiver manufactured by IXYS Integrated Circuits Division. It integrates a DTMF receiver based on the M-8870 standard and a transmitter utilizing switched-capacitor digital-to-analog conversion for low distortion. The device operates on a single +5V supply with typical current consumption of 10 mA. It features an adjustable guard time, automatic tone burst mode, and call progress detection capabilities. The component supports a standard 6500/6800 series microprocessor interface with a 2 MHz operation speed. It is housed in a 20-pin plastic SOIC package.

Telecom Feature Summary

• Integrates both DTMF transmission and reception functions within a single CMOS chip.
• Features an automatic tone burst mode for generating precise symmetric bursts and pauses.
• Includes a selectable call progress filter for detecting network call progress tones.
• Provides an adjustable external guard time circuit to tailor noise immunity and talkoff performance.

Telecom Applications

• Paging systems
• Repeater systems and mobile radio interconnect dialers
• PBX systems and computer systems
• Fax machines and pay telephones
• Credit card verification terminals

Telecom Procurement Notes

Verify that the ordering suffix -01T corresponds specifically to the 20-pin plastic SOIC tape and reel packaging configuration. Confirm the manufacturer designation as IXYS Integrated Circuits Division or Clare Micronix Division depending on the specific production lot documentation. Ensure the component meets the required operating temperature range of -40°C to +85°C for the intended application environment.

Telecom Selection Notes

Select this component when a combined DTMF encoder and decoder is required to minimize board space. The M-8880-01T is suitable for designs needing central office quality signaling with low power consumption. Consider the availability of a standard 3.58 MHz crystal for the clock circuit. Evaluate the need for call progress detection if the application involves automated dialing sequences requiring network status monitoring.

Telecom Part Context

The M-8880 is part of a family of DTMF signaling circuits designed for telecommunications applications. It succeeds earlier discrete solutions by integrating complex filtering and decoding logic into a single CMOS package. The device maintains compatibility with industry-standard microprocessor interfaces, facilitating integration into existing control architectures without significant redesign.

Telecom Replacement Considerations

The MT8880CSR1 from Microchip is a documented equivalent DTMF transceiver offering similar functionality. Verify pinout compatibility and register mapping before substitution. Check if the replacement component supports the same 6500/6800 microprocessor interface timing requirements.