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CF5746AAB

CMOS Analog Clock IC

Nippon Precision Circuits  

CF5746 Series

Motor Output

The motor output can be matched to the clock using

a step needle movement (3 options) or a continuous

needle movement (1 option), depending on the

device selected.

Active level

Needle period tCY (s)

Pulsewidth tPW (ms)

Movement

CF5746AAB

HIGH

1

23.4375

Step

CF5746ABA

HIGH

1

31.25

Step

CF5746BCA

–

0.125

50% duty

Continuous

Test Functions

Open-circuit output

When AI/SNZ is open circuit, a 512 Hz tone is

output (except on the CF5746AFA and AGA).

Time shortening function

This function is used to reduce the alarm output

snooze interval and the auto-stop time. This function

is active under either of the following conditions.

s TEST must be HIGH.

s OUT1 and OUT2 must both be HIGH.

Note that devices other than the CF5746BCA (that

is, the step needle movement devices) also have

reduced motor output needle periods for the case

where TEST is HIGH.

Motor output needle period

Alarm output

Auto-stop time

Snooze interval

Device

1/4

Unmodulated

1/1024

1/1024

AAB

ADC

AEA

AFA (AO1)

AGA (AO1)

TEST = HIGH

1/4

–

1/1024

1/1024

ABA

AFA (AO2)

AGA (AO2)

Power-ON Clear Function

When power is first applied, the snooze state and

alarm auto-stop state are reset to their default values.

CF5746ADC

HIGH

1

46.875

Step

CF5746AEA

HIGH

1

31.25

Step

C F 5 7 4 6 A FA

HIGH

1

46.875

Step

C F 5 7 4 6 AG A

HIGH

1

31.25

Step

–

–

1/1024

1/1024

BCA

–

Unmodulated

1/1024

1/1024

AAB

ADC

AEA

AFA (AO1)

AGA (AO1)

OUT1 = OUT2 = HIGH

–

–

1/1024

1/1024

ABA

AFA (AO2)

AGA (AO2)

–

–

1/1024

1/1024

BCA

NIPPON PRECISION CIRCUITS—5

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