NTE1648

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: (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

Electrical Characteristics: (T_A = +25°C, All voltages referenced to GND unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Operating Supply Voltage V_CC - - 29 V

Initial Supply Voltage V_SI Note 1 17 19 21 V

Initial Supply Current I_SI NTE1649 - 6.8k - Pin2 to GND, Note 1 1.4 2.5 4.2 mA

Sustaining Voltage V_SUS Note 2 9.7 11.0 12.0 V

Sustaining Current I_SUS No Load, V_CC = V_SUS, Note 2 0.7 1.4 2.5 mA

Trigger Voltage V_TR NTE1648 ONLY, V_CC = 15V, Note 3 9.0 10.5 12.0 V

Trigger Current I_TR NTE1648 ONLY, Note 3 - 20 1000
Note 5 µA

Disable Voltage V_DIS NTE1648 ONLY, Note 4 - - 0.5 V

Disable Current I_DIS NTE1648 ONLY, Note 4 -40 -50 - µA

Output Voltage, High V_OH V_CC = 21V, I₈ = -15mA, Pin6 = 6V, Pin7 = GND 17 19 21 V

Output Voltage, Low V_OL V_CC = 21V, I₈ = 15mA, Pin6 = 6V, Pin7 = GND - - 1.6 V

Sink Current I_IN (Pin3) Pin3 = 6V, Pin4 = GND - - 500 nA

I_IN (Pin7) Pin7 = 6V, Pin6 = GND - - 500 nA

High Frequency f_H1 R₃ = 191k, C₃ = 6800pF 461 512 563 Hz

f_H2 R₃ = 191k, C₃ = 6800pF 576 640 704 Hz

Low Frequency f_L R₂ = 165k, C₂ = 0.47µF 9 10 11 Hz

Note 1. Initiation supply voltage (V_SI) is the supply voltage required to start the tone ringer oscillating.

Note 2. Sustaining voltage (V_SUS) is the supply voltage required to maintain oscillation.

Note 3. V_TR and I_TR are the conditions applied to trigger in to start oscillation for V_SUS </= V_CC </= V_SI.

Note 4. V_DIS and I_DIS are the conditions applied to trigger in to inhibit oscillation for V_SI </= V_CC.

Note 5. Trigger current must be limited to this value externally.