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:
(T
A
= +25°C unless otherwise specified)
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V
Power Dissipation, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mW
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –45° to +65°C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C