NTE1648
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NTE1648 & 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:

  • Two Oscillators
  • Output Amplifier
  • Power Supply Control Circuit

Features:

  • Designed for Telephone Bell Replacement
  • Low Current Drain
  • Small Size 8-Lead MINIDIP Package
  • Adjustable 2-Frequency Tone
  • Adjustable Warbling Rate
  • Built-In Hysteresis Prevents False Triggering and Rotary Dial "CHIRPS"
  • Extension Tone Ringer Modules
  • EXternal Triggering or Ringer Disable (NTE1648)
  • 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 voltages referenced to GND unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Operating Supply Voltage VCC   - - 29 V
Initial Supply Voltage VSI Note 1 17 19 21 V
Initial Supply Current ISI NTE1649 - 6.8k - Pin2 to GND, Note 1 1.4 2.5 4.2 mA
Sustaining Voltage VSUS Note 2 9.7 11.0 12.0 V
Sustaining Current ISUS No Load, VCC = VSUS, Note 2 0.7 1.4 2.5 mA
Trigger Voltage VTR NTE1648 ONLY, VCC = 15V, Note 3 9.0 10.5 12.0 V
Trigger Current ITR NTE1648 ONLY, Note 3 - 20 1000
Note 5		 µA
Disable Voltage VDIS NTE1648 ONLY, Note 4 - - 0.5 V
Disable Current IDIS NTE1648 ONLY, Note 4 -40 -50 - µA
Output Voltage, High VOH VCC = 21V, I8 = -15mA, Pin6 = 6V, Pin7 = GND 17 19 21 V
Output Voltage, Low VOL VCC = 21V, I8 = 15mA, Pin6 = 6V, Pin7 = GND - - 1.6 V
Sink Current IIN (Pin3) Pin3 = 6V, Pin4 = GND - - 500 nA
IIN (Pin7) Pin7 = 6V, Pin6 = GND - - 500 nA
High Frequency fH1 R3 = 191k, C3 = 6800pF 461 512 563 Hz
fH2 R3 = 191k, C3 = 6800pF 576 640 704 Hz
Low Frequency fL R2 = 165k, C2 = 0.47µF 9 10 11 Hz

 
Note 1. Initiation supply voltage (VSI) is the supply voltage required to start the tone ringer oscillating.
Note 2. Sustaining voltage (VSUS) is the supply voltage required to maintain oscillation.
Note 3. VTR and ITR are the conditions applied to trigger in to start oscillation for VSUS </= VCC </= VSI.
Note 4. VDIS and IDIS are the conditions applied to trigger in to inhibit oscillation for VSI </= VCC.
Note 5. Trigger current must be limited to this value externally.

 

Pin Connection Diagram (NTE1648)
Pin Connection Diagram

Pin Connection Diagram (NTE1649)
Pin Connection Diagram

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