NTE NTE1648, NTE1649 Datasheet

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:

Supply Voltage, V
Power Dissipation, P
Operating Temperature Range, T
Storage Temperature Range, T

CC

D

(TA = +25°C unless otherwise specified)

stg

opr

30V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

400mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–45° to +65°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Parameter Symbol Test Conditions Min Typ Max Unit

Operating Supply Voltage V
Initiation Supply Voltage V
Initiation Supply Current I
Sustaining Voltage V
Sustaining Current I
Trigger Voltage V
Trigger Current I

CC

SI

SI

SUS

SUS

TR

TR

Note 1 17 19 21 V
NTE1649–6.8k–Pin2 to GND, Note 1 1.4 2.5 4.2 mA
Note 2 9.7 11.0 12.0 V
No Load, VCC = V

, Note 2 0.7 1.4 2.5 mA

SUS

NTE1648 ONLY, VCC = 15V, Note 3 9.0 10.5 12.0 V
NTE1648 ONLY, Note 3 – 20.0 1000

– – 29 V

µA

Note 5
Disable Voltage V
Disable Current I
Output Voltage High V

DIS

DIS

OH

NTE1648 ONLY, Note 4 – – 0.5 V
NTE1648 ONLY, Note 4 –40 –50 – µA
VCC = 21V, I8 = –15mA,

17 19 21 V

Pin6 = 6V, Pin7 = GND

Output Voltage Low V

OL

VCC = 21V, I8 = 15mA,

– – 1.6 V

Pin6 = 6V, Pin7 = GND

Sink Current IIN (Pin3) Pin3 = 6V, Pin4 = GND – – 500 nA

IIN (Pin7) Pin7 = 6V, Pin6 = GND – – 500 nA

High Frequency f

Low Frequency f

H1

f

H2

L

R3 = 191k, C3 = 6800pf 461 512 563 H
R3 = 191k, C3 = 6800pf 576 640 704 H
R2 = 165k, C2 = 0.47µf 9 10 11 H

Z
Z
Z

Note 1. Initiation supply voltage (VSI) is the supply voltage required to start the tone ringer oscillating.
Note 2. Sustaining voltage (V
Note 3. V
Note 4. V

and ITR are the conditions applied to trigger in to start oscillation for V

TR
DIS

and I

are the conditions applied to trigger in to inhibit oscillation for VSI ≤ VCC.

DIS

) is the supply voltage required to maintain oscillation.

SUS

≤ VCC ≤ VSI.

SUS

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

Pin Connection Diagram (NTE1648)

R1 R2

Low

3

Freq
OSC

C1 C2

1
5

Input

Power

Supply

with

Hysteresis

7

4

High
Freq

6

Amp

OSC

NOTE: C1, C2, R1, and
R2 are external parts

Output

8

2

Trigger Input