M-8888-01T

Telecom Overview

The M-8888-01T is a complete DTMF transceiver manufactured by IXYS Integrated Circuits Division (formerly Clare). It integrates a DTMF receiver based on the M-8870 standard and a transmitter using switched-capacitor digital-to-analog conversion. The device operates on a single +5V supply with a typical current of 10 mA. It features a standard 8051/8086/8 microprocessor interface, adjustable guard time, automatic tone burst mode, and call progress detection. The -01T suffix indicates a 20-pin plastic SOIC package supplied in tape and reel format.

Telecom Feature Summary

• Complete DTMF transmitter and receiver functionality in a single CMOS chip
• Standard 8051, 8086/8 microprocessor interface for precise control
• Adjustable guard time and automatic tone burst mode for accurate signaling
• Call progress mode for detecting network status tones

Telecom Applications

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

Telecom Procurement Notes

Verify the -01T suffix confirms the tape and reel packaging variant rather than the tube or DIP versions. Confirm the manufacturer lineage from Clare to IXYS to Microchip if sourcing replacements. Ensure the specific revision level matches the design requirements for timing parameters.

Telecom Selection Notes

Select this component when a central office quality DTMF solution is required with low power consumption. The integrated oscillator eliminates the need for external clock circuits beyond a standard crystal. Consider the available packages if board space constraints favor surface mount over through-hole options.

Telecom Part Context

The M-8888 series serves as a foundational DTMF interface for telecommunications equipment. The M-8888-01T specifically denotes the surface-mount SOIC variant packaged for automated assembly. It replaces earlier discrete solutions or less integrated transceivers in legacy telephone hardware designs.

Telecom Replacement Considerations

Direct pin-compatible substitutes include the MT8888C from Microchip/Zarlink. Verify that alternative DTMF transceivers support the same 8051/8086 interface and voltage levels before substitution.