CF5746 查看數據表（PDF） - Nippon Precision Circuits

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CF5746

CMOS Analog Clock IC

Nippon Precision Circuits  

CF5746 Series

FUNCTIONAL DESCRIPTION

Alarm Input/Output

AI/SNZ input Deboucing circuit

A bounce delay is provided on the AI/SNZ input,

regardless of whether the input is LOW or HIGH, to

eliminate erroneous operation caused by input

bounce. For tON ≤ 31.25 ms, any alarm input or

snooze input signal is ignored. For tON ≥ 62.5 ms,

the alarm input or snooze input is accepted.

Alarm/snooze function

An active level on AI/SNZ for ≥ 62.5 ms triggers the

alarm function, and alarm operation starts.

During alarm output, an active level on AI/SNZ for ≥

62.5 ms triggers the snooze function. In snooze

mode, the alarm output is temporarily stopped for an

interval of approximately 256 seconds. After this

interval ends, alarm output restarts.

Alarm active level

SNZ interface

SNZ time tSNZ(s)

SNZ release

CF5746AAB

LOW

Yes

256

No

CF5746ABA

LOW

Yes

256

No

CF5746BCA

LOW

Yes

256

No

For devices other than the CF5746ADC, the snooze

interval count is restarted from 0 if another snooze

input is received while in snooze mode. After the

snooze interval ends, alarm output restarts.

For the CF5746AFA and AGA, an active level on

AI/SNZ for ≥ 2 s in snooze mode cancels the snooze

and immediately the alarm signal restarts (snooze

release).

CF5746ADC

HIGH

No

256

No

CF5746AEA

LOW

Yes

256

No

C F 5 7 4 6 A FA

LOW

Yes

256

Yes (2 s)

C F 5 7 4 6 AG A

LOW

Yes

256

Yes (2 s)

Alarm output

The CF5746 Series devices feature a combination of

various alarm output options to cover a wide range of

clock specifications.

s Step output function (CF5746AAB, ADC, AEA,

AFA (AO1), AGA (AO1))

The alarm output increases in volume over 3 or 4

steps, depending on the device selected.

s Auto-stop function

After the alarm has been active continuously for

128 seconds, auto-stop mode becomes active and

the output stops.

Pins

Active level

Frequency fPW (Hz)

Modulation fCY (Hz)

Step 1

Step 2

Duty (%)

Step 3

Step 4

Step 1

Step 2

Step time

(s)

Step 3

Step 4

Auto-stop tSTOP(s)

CF5746AAB

AO

AO

HIGH LOW1

4096 4096

8+1 8+1

12.5 12.5

25

25

50

50

–

–

0 to 7 0 to 7

7 to 15 7 to 15

15 to

AS2

15 to AS

–

–

128

CF5746ABA

AO1 AO2

HIGH HIGH

DC

DC

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

128

CF5746BCA

AO1 AO2

HIGH HIGH

DC

DC

–

–

–

–

–

–

–

–

–

–

–

–

–

–

CF5746ADC

AO

AO

HIGH LOW1

2048 2048

8+1 8+1

6.26 6.26

12.5 12.5

25

25

50

50

0 to 3 0 to 3

3 to 7 3 to 7

CF5746AEA

AO

AO

HIGH LOW1

2048 2048

8+1 8+1

6.26 6.26

12.5 12.5

50

50

–

–

0 to 7 0 to 7

7 to 15 7 to 15

C F 5 7 4 6 A FA

AO1 AO2

HIGH HIGH

2048 DC

8+1

–

12.5

–

25

–

50

–

–

–

0 to 7

–

7 to 15 –

C F 5 7 4 6 AG A

AO1 AO2

HIGH HIGH

2048 DC

8+1

–

6.26

–

12.5

–

50

–

–

–

0 to 7

–

7 to 15 –

–

– 7 to 31 7 to 31 15 to AS 15 to AS 15 to AS – 15 to AS –

–

–

128

31 to AS 31 to AS

128

–

–

128

–

–

128

–

–

128

1. AO has the opposite polarity to AO only when output (same phase when non-active).

2. AS = auto-stop

NIPPON PRECISION CIRCUITS—4

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