NTE1691 Datasheet | NTE Electronics

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. Functions: D Mute Output Logic “0” D Pulse Output Logic “0” D RC Oscillation for Reference Frequency D Designed to Operate Directly from the Telephone Line D Used CMOS Technology for Low Voltage, Low Power Operation D Power Up Clear Circuitry D NTE1691 Pin2: VREF D NTE1692 Pin2: Tone Out Features : D Uses Either a Standard 2 of 7 Matrix Keyboard with Negative True mon or the Inexpensive Form A- Type Keyboard D Make/Break Ratio Can Be Selected D Redial with - or # D Tone Signal Output or On- Chip Reference Voltage by Bonding Option on Chip D 10pps/20pps Can be Selected Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) DC Supply Voltage, VCC - - - - - - - - - - - . . . . 6.2V Voltage on Any Pin, VIN - - - - - - - - - . VCC+0.3, GND- 0.3V Power Dissipation, PD - - - - - - - - - - - . . . 500m W Operating Temperature Range, Topr - - - - - - - - . - 30° to +60°C Storage Temperature Range, Tstg - - - - - - - - . . - 65° to +150°C DC Electrical Characteristics: (TA = +25°C, Note 1 unless otherwise specified) Parameter Supply Voltage Key Contact Resistance Keyboard Capacitance Key Input Voltage Key Pull- Up Resistance Key Pull- Down Resistance Mute Sink Current Pulse Output Sink Current Tone Output Sink Current Tone Output Source Current Memory Retention Current Operating Current Mute or Pulse Off Leakage VREF Output Source Current Symbol VCC RKI CKI KIH KIL KIRU KIRD IM IP ITL ITH IMR IOP ILKG IREF VCC = 6V...