Description:

The NTE1691 and NTE1692 are monolithic CMOS integrated circuits in an 18–Lead DIP type package that provide all the features required for implementing a pulse dialer with redial.

Features:

• Uses Either a Standard 2 of 7 Matrix Keyboard with Negative True Common or the Inexpensive Form A–Type Keyboard

• Make/Break Ratio Can Be Selected

• Redial with * or #

• Tone Signal Output or On–Chip Reference Voltage by Bonding Option on Chip

• 10pps/20pps Can be Selected

Functions:

• Mute Output Logic “0”

• Pulse Output Logic “0”

• RC Oscillation for Reference Frequency

• Designed to Operate Directly from the Telephone Line

• Used CMOS Technology for Low Voltage, Low Power Operation

• Power Up Clear Circuitry

• NTE1691 Pin2: VREF

• NTE1692 Pin2: Tone Out