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The MT8870CE is a DTMF (Dual-Tone Multi-Frequency) receiver IC manufactured by MITEL (now part of Microchip Technology).

Specifications:

• Supply Voltage: 5V ±10%
• Operating Temperature Range: 0°C to +70°C
• Power Consumption: 35mW (typical)
• Package: 18-pin DIP (Dual In-line Package)
• Input Frequency Range: 300Hz to 3kHz
• DTMF Decoding: Full 16-tone DTMF decoding (0-9, *, #, A-D)
• Output Format: 4-bit binary (BCD)
• Guard Time Adjustable: Yes
• Built-in Band-Split Filter: Yes
• Clock Input: 3.579545MHz crystal or external clock

Descriptions:

The MT8870CE is a complete DTMF receiver that decodes standard telephone keypad tones into a 4-bit binary output. It integrates band-split filters and digital decoding functions, making it suitable for telephony and remote control applications.

Features:

• Integrated Bandpass Filters: Separates high and low DTMF tones.
• Digital Counting Technique: Ensures accurate tone detection.
• Built-in Latches: Holds decoded output until new valid tone is detected.
• StD/GT Pin: Adjustable guard time for tone validation.
• ESt Pin: Early steering output for faster response.
• TOE Pin: Tri-state output enable for bus interfacing.
• Low Power Consumption: Suitable for battery-operated devices.

This IC is commonly used in telephone systems, remote control applications, and security systems requiring DTMF decoding.