MT8880CS1

Telecom Overview

The MT8880CS1 is a single-channel integrated Dual-Tone Multi-Frequency (DTMF) transceiver manufactured by Microchip Technology. Designed for telecommunications applications, it supports both DTMF tone generation and decoding within a single circuit. The device operates on a supply voltage ranging from 4.75V to 5.25V with a typical supply current of 7mA. It functions reliably across an industrial temperature range of -40°C to +85°C. The component is housed in a 20-SOIC surface-mount package with a width of 7.50mm.

Telecom Feature Summary

• Integrates complete DTMF transmitter and receiver capabilities into a single chip.
• Provides central office quality signal processing for reliable telecommunication performance.
• Features low power consumption suitable for energy-efficient designs.
• Includes a dedicated microprocessor port for simplified system integration.

Telecom Applications

• Telephone exchange systems requiring DTMF signaling.
• Automated attendant and voice response units.
• Telecommunications equipment needing call progress detection.

Telecom Procurement Notes

Verify the specific suffix 'S1' against official Microchip documentation to confirm package type and tape-and-reel specifications. Confirm end-of-life status and lead times through authorized distributors, as availability may be restricted. Ensure compliance with RoHS and REACH directives relevant to the manufacturing date code.

Telecom Selection Notes

Select this component when a single-chip solution for both DTMF sending and receiving is required. Ensure the design accommodates the 20-SOIC footprint and 4.75V-5.25V supply range. Verify that the host microcontroller can interface with the provided microprocessor port and handle the necessary control signals for register access and interrupt management.

Telecom Part Context

This part belongs to the MT8880 family of DTMF transceivers. Other variants include the MT8880CE and MT8880CN, which may differ in packaging or temperature ratings. The MT8880 series is widely recognized in legacy and specialized telecom infrastructure for its robust dual-tone multi-frequency handling capabilities.

Telecom Replacement Considerations

Direct substitutes include other MT8880 variants such as MT8880CS or MT8880CE, depending on package requirements. Cross-vendor equivalents exist but require careful verification of pin compatibility and electrical characteristics against the original datasheet.

Telecom FAQ

What external components are required for oscillator operation?

An external 3.58MHz crystal is typically connected to the OSC1 and OSC2 pins to establish the internal clock source for tone generation and detection.

How does the device indicate signal reception completion?

The device uses an Interrupt Request (IRQ) pin to notify the host processor when a valid DTMF signal has been received or transmitted.

What is the function of the UREF pin?

The UREF pin provides an internal reference voltage, which is equal to half of the positive supply voltage (UDD), used for internal circuit biasing.