NTE1731

更新时间： 2024-01-06 20:53:44

品牌	Logo	应用领域
NTE		脉冲
页数	文件大小	规格书
5页	32K
描述
Integrated Circuit CMOS 10 Number Pulse Dialer

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数据手册

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NTE1731 数据手册

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

Parameter

Standby Current

Symbol

I_SB

Test Conditions

V_DD= 2.5V, Note 5

V_DD= 2.5V, Note 6

V_DD= 2.5V, V_O= 0.5V

V_DD= 6V, V_O= 6V

Min

Typ

1.0

100

2.0

4.0

0.001

–

Max Unit

–

5.0

200

–

µA

kΩ

Operating Current

I_OP

–

MUTE Sink Current

Pulse Sink Current

I_ML

0.5

I_PL

1.0

–

MUTE Pulse Leakage Current

Key Contact Resistance

Keyboard Capacitance

“0” Logic Level

I_LKG

RK₁

CK₁

V_IL

–

1.0

3.0

0.2V_DD

V_DD

–

GND

0.8V_DD

–

“1” Logic Level

V_IN

–

Key Pull–Up Resistance

Key Pull–Down Resistance

K_RU

K_RD

V_DD= 4V, Note 7

100

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

Oscillator Frequency

Key Debounce Time

Oscillator Start–Up Time

Pulse Rate

Symbol

f_OSC

t_DB

Test Conditions

Note 8

Min

–

Typ

480

–

Max Unit

–

kHz

pps

Note 9, Note 10

–

t_OS

–

8.0

–

P_R

Note 10

–

840

Break Time

t_B

Pin9 = V_DD, Note 10

Pin9 = GND, Note 10

Note 10

–

Inter–Digital Pause Time

t_IDP

–

Mute Overlap Time

t_MOL

Note 10

–

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

R < 20Ω, R_A≥ 70KΩ, C_O≤ 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.

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

123 4 5

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