The MT8880C/C-1 is a monolithic DTMF transceiver with call progress filter. It is fabricated in Mitel’s ISO2-CMOS technology, which provides low power dissipation and high reliability. The DTMF receiver is based upon the industry standard MT8870 monolithic DTMF receiver; the transmitter utilizes a switched capacitor D/A converter for low distortion, high accuracy DTMF signalling. Internal counters provide a burst mode such that tone bursts can be transmitted with precise timing. A call progress filter can be selected allowing a microprocessor to analyze call progress tones. A standard microprocessor bus is provided and is directly compatible with 6800 series microprocessors. The MT8880C-1 is functionally identical to the MT8880C except for the performance of the receiver section, which is enhanced to accept and reject lower signal levels.
The document describes the MT8880C/C-1, a monolithic DTMF transceiver fabricated in Mitel's ISO-CMOS technology. It functions as both a transmitter and receiver with features including low power consumption, adjustable guard time, automatic tone burst mode, and call progress filtering.
The device is designed for applications such as credit card systems, paging systems, repeater systems, interconnect dialers, and personal computers. The datasheet details the functional block diagram, pin connections, input configurations (single-ended and differential), receiver section architecture, steering circuit logic, and guard time adjustment formulas.
| Operating Temperature Range | -40°C to +85°C |
|---|---|
| Power Supply Voltage | +5V typical |
| Oscillator Frequency | 3.579545 MHz |
The device is suitable for credit card systems, paging systems, repeater systems/mobile radio, interconnect dialers, and personal computers.
Yes, it provides a standard microprocessor bus that is directly compatible with 6800 series microprocessors.