NTE1731 查看數據表（PDF） - NTE Electronics

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NTE1731

Integrated Circuit CMOS 10 Number Pulse Dialer

NTE Electronics 

DC Characteristics: (–30°C x TA x =60°C unless otherwise specified)

Parameter

Symbol

Test Conditions

Min Typ Max Unit

Standby Current

Operating Current

MUTE Sink Current

Pulse Sink Current

MUTE Pulse Leakage Current

Key Contact Resistance

Keyboard Capacitance

“0” Logic Level

“1” Logic Level

Key Pull–Up Resistance

Key Pull–Down Resistance

ISB

IOP

IML

IPL

ILKG

RK1

CK1

VIL

VIN

KRU

KRD

VDD = 2.5V, Note 5

VDD = 2.5V, Note 6

VDD = 2.5V, VO = 0.5V

VDD = 2.5V, VO = 0.5V

VDD = 6V, VO = 6V

VDD = 4V, Note 7

VDD = 4V, Note 7

–

1.0

5.0 µA

–

100 200 µA

0.5 2.0

– mA

1.0 4.0

– mA

– 0.001 1.0 µA

–

–

1.0 kΩ

–

–

3.0 pF

GND

– 0.2VDD V

0.8VDD –

VDD V

–

100

– kΩ

–

5.0

– kΩ

Note 5. All output pins in no–load condition when clock is stopped in Off–Hook mode.

Note 6. All output pins in no–load condition during key input, in either On–Hook or Off–Hook Mode.

Note 7. Resistance when ROW and COL pins are scanned at 125Hz and at high or low level.

AC Characteristics:

Parameter

Symbol

Test Conditions

Min Typ

Oscillator Frequency

Key Debounce Time

Oscillator Start–Up Time

Pulse Rate

Break Time

fOSC

tDB

tOS

PR

tB

Note 8

Note 9, Note 10

Note 10

Pin9 = VDD, Note 10

Pin9 = GND, Note 10

–

480

–

32

–

–

–

10

–

60

–

68

Inter–Digital Pause Time

Mute Overlap Time

tIDP

tMOL

Note 10

Note 10

–

840

–

2

Note 8. Use elements with the following characteristics as the ceramic oscillator:

R < 20Ω, RA ≥ 70KΩ, CO ≤ 500pF.

Note 9. Key input is accepted if it is valid 32msec after the start of oscillation.

Note10. Changes in proportion to the frequency of the oscillator.

Max Unit

– kHz

– ms

8.0 ms

– pps

– ms

– ms

– ms

– ms

Functional Description:

Dialed Number Memory

During normal dialing, each digit is stored in the LND (Last Number Dialed) buffer, location 0. The

telephone number dialed can be left in this temporary LND buffer for later use or it can be copied into

any of the other nine permanent memory locations.

Telephone numbers to be automatically dialed by the NTE1731 may be entered into the LND buffer

while either On–Hook or Off–Hook.

Dialed Number Memory (Cont’d)

However, the NTE1731 must be in On–Hook mode for a number to be copied into a permanent

memory location. A number may be copied and stored by entering the key sequence ∗ ∗ N

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