NTE1690
Integrated Circuit
Telephone DTMF Dialer
Description:
The NTE1690 is a low threshold voltage, field鈥搃mplanted, metal gate CMOS integrated circuit in a
16鈥揕ead DIP type package. This device interfaces directly to a standard telephone keypad and gen-
erates all dual tone multi鈥揻requency pairs required in tone dialing systems. The tone synthesizers
are locked to an on鈥揷hip reference oscillator using an inexpensive 3.579545MHz crystal for high tone
accuracy. The crystal and an output load resistor are the only external components required for tone
generation. A MUTE OUT logic signal, which changes state when any key is depressed is also pro-
vided.
Features:
D
3V to 10V Operation When Generating Tones
D
2V Operation of Keyscan and MUTE Logic
D
Static Sensing of Key Closures or Logic Inputs
D
On鈥揅hip 3.579545MHz Crystal鈥揅ontrolled Oscillator
D
Output Amplitudes Proportional to Supply Voltage
D
High Group Pre鈥揈mphasis
D
Low Harmonic Distortion
D
Open Emitter鈥揊ollower Low鈥揑mpedance Output
D
SINGLE TONE INHIBIT Pin
Absolute Maximum Ratings:
Supply Voltage (V
DD
鈥?V
SS)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Maximum Voltage at Any Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
DD
+0.3V to V
SS
鈥?.3V
Power Dissipation, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +60擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Electrical Characteristics:
(鈥?0擄C
<
T
A
<
+60擄C, 3V < V
DD
< 10V unless otherwise specified)
Parameter
Minimum Supply Voltage for Keysense and
MUTE Logic Functions
Operating Current, Idle
Operating Current, Generating Tones
R
L
= 10k鈩?/div>
V
O
= 5V
Test Conditions
Min
鈥?/div>
NTE1690 產(chǎn)品屬性
NTE
置換半導(dǎo)體
否
1
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