NTE1691 & NTE1692
Integrated Circuit
Telephone Pulse Dialer
w
/Redial
Description:
The NTE1691 and NTE1692 are monolithic CMOS integrated circuits in an 18Lead DIP type package
that provide all the features required for implementing a pulse dialer with redial.
Functions:
D
Mute Output Logic "0"
D
Pulse Output Logic "0"
D
RC Oscillation for Reference Frequency
D
Designed to Operate Directly from the Telephone Line
D
Used CMOS Technology for Low Voltage, Low Power Operation
D
Power Up Clear Circuitry
D
NTE1691 Pin2: V
REF
D
NTE1692 Pin2: Tone Out
Features:
D
Uses Either a Standard 2 of 7 Matrix Keyboard with Negative True Common or the Inexpensive
Form AType Keyboard
D
Make/Break Ratio Can Be Selected
D
Redial with * or #
D
Tone Signal Output or OnChip Reference Voltage by Bonding Option on Chip
D
10pps/20pps Can be Selected
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
DC Supply Voltage, V
CC
6.2V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage on Any Pin, V
IN
V
CC
+0.3, GND0.3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation, P
D
500mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
30
to +60
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Electrical Characteristics: (T
A
= +25
C, Note 1 unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
V
CC
2.5
6.0
V
Key Contact Resistance
R
KI
Note 2
1
k
Keyboard Capacitance
C
KI
Note 2
30
pF
Key Input Voltage
K
IH
2 of 7 input mode, Note 2
0.8V
CC
V
CC
V
K
IL
GND
0.2V
CC
V
Key PullUp Resistance
K
IRU
V
CC
= 6V
100
k
Key PullDown Resistance
K
IRD
V
IN
= 4.8V
4.0
k
Mute Sink Current
I
M
V
CC
= 2.5V, V
O
= 500mV, Note 3
500
A
Pulse Output Sink Current
I
P
V
CC
= 2.5V, V
O
= 500mV, Note 4
1.0
mA
Tone Output Sink Current
I
TL
V
CC
= 2.5V, V
O
= 500mV, Note 5
250
A
Tone Output Source Current
I
TH
V
CC
= 2.5V, V
O
= 500mV, Note 5
250
A
Memory Retention Current
I
MR
All outputs under no load, Note 7
0.7
A
Operating Current
I
OP
All outputs under no load
100
150
A
Mute or Pulse Off Leakage
I
LKG
V
CC
= 6V, V
O
= 6V, Note 3, Note 4
0.001
1.0
A
V
REF
Output Source Current
I
REF
Note 6
1.0
7.0
mA
Note 1. Typical values are to be used as a design aid and are not subject to production testing.
Note 2. Applies to key input pin (R
1
R
4
, C
1
C
3
).
Note 3. Applies to MUTE output pin.
Note 4. Applies to PULSE output pin.
Note 5. Applies to TONE pin (NTE1692 only).
Note 6. Applies to V
REF
pin (NTE1691 only).
Note 7. Current necessary for memory to be maintained. All outputs unloaded.
AC Electrical Characteristics: (T
A
= +25
C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Oscillator Frequency
F
OSC
Note 8
4
kHz
Key Input Debounce Time
T
DB
Note 10, Note 11
10
ms
Key Down Time for Valid Entry
T
KD
Note 11, Note 12
40
ms
Key Down Time During TwoKey Roll Over
t
KR
Note 11
5
ms
Oscillator StartUp Time
t
os
V
CC
= 2.5V
1
ms
Mute Valid After Last Outpulses
t
MO
Note 10, Note 11
5
ms
Pulse Output Pulse Rate
P
R
Note 9
10
PPS
OnHook Time Required to Clear Memory
t
OH
Note 11
300
ms
PreDigital Pause
T
PDP
Note 10, Note 11
800
ms
InterDigital Pause
T
IDP
Note 10, Note 11
800
ms
Frequency Stability
f
V
CC
= 2.5 to 3.5V
4
%
V
CC
= 2.5 to 6.0V
4
%
Tone Output Frequency
F
TONE
Note 11, Note 13
1
kHz
Note 8. R
S
= 2M
, R = 220k
, C = 390pF.
Note 9. If Pin10 is tied to V
CC
, the output pulse rate will be 20pps.
Note10. If the 20pps option is selected, the time will be
1
/
2
these shown.
Note 11. These times are directly proportional to the oscillator frequency.
Note12. Debounce plus oscillator startup time
40ms.
Note13. If the 20pps option is selected, the tone output frequency will be 2kHz (NTE1692 only).
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