TCM1520A - Ring Detector

Product Overview

Texas Instruments

Part number	TCM1520A
Manufacturer	Texas Instruments
File Size	110.84 KB
Description	Ring Detector
Datasheet	TCM1520A Datasheet
Additional preview pages of the TCM1520A datasheet.

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

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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Published: Mar 8, 2025 |