TCM1520A

The TCM1520A is Ring Detector designed by Texas Instruments.

Product Overview

Texas Instruments

Part number	TCM1520A
Manufacturer	Texas Instruments
File Size	110.84 KB
Description	Ring Detector
Datasheet	TCM1520A-etcTI.pdf
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 |