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Clare  Inc.
Clare Inc.


DTMF Receiver

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DTMF Receiver
Features • • • • • • • Low Power Consumption Adjustable Acquisition and Release Times Central Office Quality and Performance Power-down and Inhibit Modes (-02 only) Inexpensive 3.58 MHz Time Base Single 5 Volt Power Supply Dial Tone Suppression Description The M-8870 is a full DTMF Receiver that integrates both bandsplit filter and decoder functions into a single 18-pin DIP or SOIC package. Manufactured using CMOS process technology, the M-8870 offers low power consumption (35 mW max) and precise data handling. Its filter section uses switched capacitor technology for both the high and low group filters and for dial tone rejection. Its decoder uses digital counting techniques to detect and decode all 16 DTMF tone pairs into a 4-bit code. External component count is minimized by provision of an on-chip differential input amplifier, clock generator, and latched tri-state interface bus. Minimal external components required include a low-cost 3.579545 MHz color burst crystal, a timing resistor, and a timing capacitor. The M-8870-02 provides a “power-down” option which, when enabled, drops consumption to less than 0.5 mW. The M-8870-02 can also inhibit the decoding of fourth column digits (see Tone Decoding table on page 5). Ordering Information Part # M-8870-01 M-8870-01SM M-8870-01SMTR M-8870-02 M-8870-02SM M-8870-02T Block Diagram Description 18-pin plastic DIP 18-pin plastic SOIC 18-pin plastic SOIC, tape and reel 18-pin plastic DIP, power-down, option 18-pin plastic SOIC, power-down, option 18-pin plastic SOIC, power-down option, tape and reel

Applications • • • • • Telephone switch equipment Remote data entry Paging systems Personal computers Credit card systems

Pin Configuration




Absolute Maximum Ratings
Parameter Power supply voltage (VDD - VSS) Voltage on any pin Current on any pin Operating temperature Storage temperature Symbol VDD VDC IDD TA TS Value 6.0 V max VSS -0.3, VDD +0.3 10 mA max -40°C to + 85°C -65°C to + 150°C Absolute Maximum Ratings are stress ratings. Stresses in excess of these ratings can cause permanent damage to the device. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this data sheet is not implied. Exposure of the device to the absolute maximum ratings for an extended period may degrade the device and effect its reliability.

Note: Exceeding these ratings may caus

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