NTE1649

NTE1648 and NTE1649 Integrated Circuit Telephone Tone Ringer Description: The NTE1648 and NTE1649 are bipolar integrated circuits in an 8–Lead DIP type package designed for telephone bell replacement. Functions: D Two Oscillators D Output Amplifier D Power Supply Control Circuit Features: D Designed for Telephone Bell Replacement D Low Current Drain D Small Size 8–Lead MINIDIP Package D Adjustable 2–Frequency Tone D Adjustable Warbling Rate D Built–in Hysteresis Prevents False Triggering and Rotary Dial “CHIRPS” D Extension Tone Ringer Modules D Alarms or Other Altering Devices D External Triggering or Ringer Disable (NTE1648) D Adjustable for Reduced Supply Initiation Current (NTE1649) Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –45° to +65°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Electrical Characteristics: (TA = +25°C, All voltage referenced to GND unless otherwise specified) Parameter Operating Supply Voltage Initiation Supply Voltage Initiation Supply Cu...