NTE1690 Datasheet (NTE) - Integrated Circuit Telephone DTMF Dialer

NTE1690, Integrated Circuit Telephone DTMF Dialer

The NTE1690 is a low threshold voltage, field *implanted, metal gate CMOS integrated circuit in a 16 *Lead DIP type package.

This device interfaces directly to a standard telephone keypad and generates all dual tone multi *frequency pairs required in tone dialing systems.

The t

NTE1690 Features

* D 3V to 10V Operation When Generating Tones D 2V Operation of Keyscan and MUTE Logic D Static Sensing of Key Closures or Logic Inputs D On

* Chip 3.579545MHz Crystal

* Controlled Oscillator D Output Amplitudes Proportional to Supply Voltage D High Group Pre

* Emphasis D Low Harmon