NTE NTE1648

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
Symbol
Test Conditions
Min
Typ
Max
Unit
–
–
29
V
Operating Supply Voltage
VCC
Initiation Supply Voltage
VSI
Note 1
17
19
21
V
Initiation 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
–
20.0
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
IIN (Pin3)
Pin3 = 6V, Pin4 = GND
–
–
500
nA
IIN (Pin7)
Pin7 = 6V, Pin6 = GND
–
–
500
nA
fH1
R3 = 191k, C3 = 6800pf
461
512
563
HZ
fH2
R3 = 191k, C3 = 6800pf
576
640
704
HZ
fL
R2 = 165k, C2 = 0.47µf
9
10
11
HZ
Sink Current
High Frequency
Low Frequency
Note
Note
Note
Note
Note
1.
2.
3.
4.
5.
Initiation supply voltage (VSI) is the supply voltage required to start the tone ringer oscillating.
Sustaining voltage (VSUS) is the supply voltage required to maintain oscillation.
VTR and ITR are the conditions applied to trigger in to start oscillation for VSUS ≤ VCC ≤ VSI.
VDIS and IDIS are the conditions applied to trigger in to inhibit oscillation for VSI ≤ VCC.
Trigger current must be limited to this value externally.
Pin Connection Diagram (NTE1648)
R1
R2
7
3
Low
Freq
OSC
High
Freq
OSC
4
C1
6
Output
Amp
8
C2
NOTE: C1, C2, R1, and
R2 are external parts
Power
Supply
Input
with
5
Hysteresis
1
2
Trigger Input
Pin Connection Diagram (NTE1649)
R2
R1
7
3
Low
Freq
OSC
High
Freq
OSC
4
C1
6
Output
Amp
8
C2
NOTE: C1, C2, R1, R2
and R3 are external
parts
Power
Supply
Input
with
5
Hysteresis
1
Regulated Initiation Current
R3
2
8
5
.256 (6.52) Max
1
4
.393 (10.0)
Max
.300 (7.62)
.150
(3.81)
.100 (2.54)
.070 (1.77) Min
.300 (7.62)