NTE NTE1691

NTE1691 & NTE1692
Integrated Circuit
Telephone Pulse Dialer w/Redial
Description:
The NTE1691 and NTE1692 are monolithic CMOS integrated circuits in an 18–Lead 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: VREF
D NTE1692 Pin2: Tone Out
Features:
D Uses Either a Standard 2 of 7 Matrix Keyboard with Negative True Common or the Inexpensive
Form A–Type Keyboard
D Make/Break Ratio Can Be Selected
D Redial with * or #
D Tone Signal Output or On–Chip Reference Voltage by Bonding Option on Chip
D 10pps/20pps Can be Selected
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2V
Voltage on Any Pin, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC+0.3, GND–0.3V
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +60°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
DC Electrical Characteristics: (TA = +25°C, Note 1 unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
2.5
–
6.0
V
Supply Voltage
VCC
Key Contact Resistance
RKI
Note 2
–
–
1
kΩ
Keyboard Capacitance
CKI
Note 2
–
–
30
pF
Key Input Voltage
KIH
2 of 7 input mode, Note 2
0.8VCC
–
VCC
V
GND
–
0.2VCC
V
KIL
Key Pull–Up Resistance
KIRU
VCC = 6V
–
100
–
kΩ
Key Pull–Down Resistance
KIRD
VIN = 4.8V
–
4.0
–
kΩ
Mute Sink Current
IM
VCC = 2.5V, VO = 500mV, Note 3
500
–
–
µA
Pulse Output Sink Current
IP
VCC = 2.5V, VO = 500mV, Note 4
1.0
–
–
mA
Tone Output Sink Current
ITL
VCC = 2.5V, VO = 500mV, Note 5
250
–
–
µA
Tone Output Source Current
ITH
VCC = 2.5V, VO = 500mV, Note 5
250
–
–
µA
Memory Retention Current
IMR
All outputs under no load, Note 7
–
0.7
–
µA
Operating Current
IOP
All outputs under no load
–
100
150
µA
Mute or Pulse Off Leakage
ILKG
VCC = 6V, VO = 6V, Note 3, Note 4
–
0.001
1.0
µA
VREF Output Source Current
IREF
Note 6
1.0
7.0
–
mA
Note
Note
Note
Note
Note
Note
Note
1.
2.
3.
4.
5.
6.
7.
Typical values are to be used as a design aid and are not subject to production testing.
Applies to key input pin (R1–R4, C1–C3).
Applies to MUTE output pin.
Applies to PULSE output pin.
Applies to TONE pin (NTE1692 only).
Applies to VREF pin (NTE1691 only).
Current necessary for memory to be maintained. All outputs unloaded.
AC Electrical Characteristics: (TA = +25°C, unless otherwise specified)
Parameter
Oscillator Frequency
Symbol
FOSC
Test Conditions
Min
Typ
Max
Unit
Note 8
–
4
–
kHz
Key Input Debounce Time
TDB
Note 10, Note 11
–
10
–
ms
Key Down Time for Valid Entry
TKD
Note 11, Note 12
40
–
–
ms
Key Down Time During Two–Key Roll Over
tKR
Note 11
5
–
–
ms
Oscillator Start–Up Time
tos
VCC = 2.5V
–
1
–
ms
Mute Valid After Last Outpulses
tMO
Note 10, Note 11
–
5
–
ms
Pulse Output Pulse Rate
PR
Note 9
–
10
–
PPS
On–Hook Time Required to Clear Memory
tOH
Note 11
300
–
–
ms
Pre–Digital Pause
TPDP
Note 10, Note 11
–
800
–
ms
Inter–Digital Pause
TIDP
Note 10, Note 11
–
800
–
ms
Frequency Stability
∆f
VCC = 2.5 to 3.5V
–
±4
–
%
VCC = 2.5 to 6.0V
–
±4
–
%
Note 11, Note 13
–
1
–
kHz
Tone Output Frequency
Note 8.
Note 9.
Note10.
Note 11.
Note12.
Note13.
FTONE
RS = 2MΩ, R = 220kΩ, C = 390pF.
If Pin10 is tied to VCC, the output pulse rate will be 20pps.
If the 20pps option is selected, the time will be 1/2 these shown.
These times are directly proportional to the oscillator frequency.
Debounce plus oscillator start–up time ≤ 40ms.
If the 20pps option is selected, the tone output frequency will be 2kHz (NTE1692 only).
Pin Connection Diagram
NTE1691
VCC 1
Vref 2
NTE1692
18 Pulse Output
17 On–Hook/Test
VCC 1
18 Pulse Output
17 On–Hook/Test
Pacifier Tone 2
Column 1 3
16 Row 1
Column 1 3
16 Row 1
Column 2 4
15 Row 2
Column 2 4
15 Row 2
Column 3 5
14 Row 3
Column 3 5
14 Row 3
GND 6
13 Row 4
GND 6
13 Row 4
RC OSC 7
12 Mute Output
RC OSC 7
12 Mute Output
RC OSC 8
11 Make/Break Select
RC OSC 8
11 Make/Break Select
RC OSC 9
10 10/20 PPS Select
RC OSC 9
10 10/20 PPS Select
18
10
1
9
.870 (22.1) Max
.250
(6.35)
.150
(3.8)
.100 (2.54)
.800 (20.3)
.125 (3.17) Min