Maker : Clare Inc.
Part No. : M-8870-01SMTR

  Datasheet PDF : M-8870-01SMTR.pdf
  Cross Reference : M-8870-01SMTR Cross Reference
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Product Information

M-8870 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 DS-M8870-R3 www.clare.com 1 M-8870 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 cause permanent damage. Functional operation under these conditions is not implied. DC Characteristics Parameter Operating supply voltage Operating supply current Standby supply current (see Note 3) Power consumption Low level input voltage High level input voltage Input leakage current Pullup (source) current on OE Input impedance, signal inputs 1, 2 Steering threshold voltage Low level output voltage High level output voltage Output low (sink) current Output high (source) current Output voltage VREF Output resistance VREF Symbol VDD IDD IDDQ PO VIL VIH IIH/IIL ISO RIN VTSt VOL VOH IOL IOH VREF ROR Min 4.75 3.5 8 2.2 VDD - 0.03 1.0 0.4 2.4 Typ 3.0 15 0.1 6.5 10 2.5 0.8 10 Max 5.25 7.0 100 35 1.5 15.0 2.5 0.03 2.7 Units V mA µA mW V V µA µA mΩ V V V mA mA V kΩ Test Conditions PD=VDD f = 3.579 MHz, VDD = 5.0 V VIN = VSS or VDD (see Note 2) OE = 0 V @ 1 kHz No load No load VOUT = 0.4 V VOUT = VDD - 0.4 V No load - *Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing. Operating Characteristics - Gain Setting Amplifier Parameter Input leakage current Input resistance Input offset voltage Power supply rejection Common mode rejection DC open loop voltage gain Open loop unity gain bandwidth Output voltage swing Tolerable capacitive load (GS) Tolerable resistive load (GS) Common mode range Symbol IN RIN VOS PSRR CMRR AVOL fC VO CL RL VCM Min 4 50 55 60 1.2 3.5 2.5 Typ ± 100 ± 25 1.5 Max 100 50 Units nA MΩ mV dB dB d...

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