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TCM1520A - Ring Detector

General Description

The TCM1520A is a monolithic ring-detection integrated circuit designed for use in isolated or nonisolated telephone applications.

The device uses a modified form of the Texas Instruments BIDFET† technology to combine low-voltage CMOS and high-voltage bipolar input/output circuitry.

Key Features

  • efficient high-voltage (40 V to 150 V) operation with a typical current drain of 1 mA. Phone Line AC Ring Signal TCM1520A Electronic Telephone or Accessory TTL /NMOS/CMOS Microprocessor During standby, the input impedance is approximately 1 MΩ or greater, which prevents any interference with parallel off-hook telephones transmitting DTMF or voice frequencies. The device achieves this high input impedance with an on-chip series zener diode that does not conduct until the voltage across AC INPUT.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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ą TCM1520A RING DETECTOR ą SCTS005B − OCTOBER 1984 − REVISED DECEMBER 1990 • On-Chip 150-V Bridge Diode Configuration • Reliable BIDFET† Technology • High Standby Impedance . . . 1 MΩ Typ • Efficient High-Voltage Operation • Output Compatible With TTL, NMOS, and CMOS • Built-In 5-V Series Regulator • Built-In Lightning and Transient Protection D OR P PACKAGE (TOP VIEW) AC INPUT 1 INVERTING OUTPUT 2 COMMON 3 5-V OUTPUT 4 8 AC INPUT 7 COMMON 6 C FILTER 5 BELL TAPPING SENSE TCM1520A APPLICATION description The TCM1520A is a monolithic ring-detection integrated circuit designed for use in isolated or nonisolated telephone applications.