CF5746 Series

NIPPON PRECISION CIRCUITS--1

NIPPON PRECISION CIRCUITS INC.

CMOS Analog Clock IC

OVERVIEW

The CF5746 Series devices are analog clock ICs that
derive their timing from a 32 kHz oscillator element.

They feature alarm outputs, snooze function and
alarm auto-stop function. They can be configured to
match a wide variety of clock specifications, alarm
functions and motor outputs.

FEATURES

32.768 kHz oscillator circuit
· R

and R

built-in

· Oscillator capacitance built-in

- C

= 30 pF (typ, excluding CF5746ADC)

- C

= 20 pF (typ, CF5746ADC)

Alarm outputs
· Compatible with electronic sound alarms and

motor bells

· 4-step increasing volume alarm output

(CF5746AAB, ADC, AEA, AFA (AO1), AGA
(AO1))

Snooze function
· Temporarily stops alarm output and then re-

starts after a fixed time

Debouce circuit (AI/SNZ pin)

Test functions
· Shortening snooze time and auto-stop time
· Increasing motor speed (excluding

CF5746BCA)

Power-ON clear function

1.5 V supply voltage

Chip form

SERIES CONFIGURATION

C F 5 7 4 6 A A B

C F 5 7 4 6 A B A

C F 5 7 4 6 B C A

C F 5 7 4 6 A D C

C F 5 7 4 6 A E A

C F 5 7 4 6 A FA

C F 5 7 4 6 AG A

Built-in
capacitance

XT pin C

(pF)

None

XT pin C

(pF)

Motor output

Active level

HIGH

Needle period t

(s)

0.125

Pulsewidth t

(ms)

23.4375

31.25

50% duty

46.875

31.25

46.875

31.25

AI/SNZ input

Alarm active level

LOW

HIGH

LOW

Pin type

512 Hz

Pull-up

SNZ interface

Yes

SNZ time t

SNZ

(s)

256

Bounce delay (ms)

31.25

SNZ release

Yes (2 s)

Alarm output

Pins

AO1

AO2

AO1

AO2

AO1

AO2

AO1

AO2

Active level

HIGH

LOW

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

HIGH

LOW

HIGH

LOW

HIGH

Frequency f

(Hz)

4096

2048

Modulation f

(Hz)

8+1

Duty (%)

Step 1

12.5

6.26

12.5

6.26

Step 2

12.5

Step 3

Step 4

Step time
(s)

Step 1

0 to 7

0 to 3

0 to 7

Step 2

7 to 15

3 to 7

7 to 15

Step 3

15 to

2. AS = auto-stop

15 to

7 to 31

15 to

Step 4

31 to

min (mA)

0.8

min (mA)

0.8

0.002

0.8

0.002

0.8

0.002

0.8

Auto-stop t

STOP

(s)

128

Pad layout

Other

Power-ON clear, oscillator R

and R

built-in

CF5746 Series

NIPPON PRECISION CIRCUITS--2

PAD DIMENSIONS

BLOCK DIAGRAM

N o .

L a yout

D i m e n s i o n s ( µ m )

A (ex. B C A )

B ( B C A )

VDD

VSS

166

1210

VSS

VDD

166

882

OUT1

AI/SNZ

166

474

AI/SNZ

AO1

166

228

TEST

AO2

444

169

OUT2

OUT1

1444

169

AO (AO1)

OUT2

1444

513

AO (AO2)

TEST

1444

1219

1444

1516

1192

1531

Chip size: 1.61

1.70 mm

Chip thickness: 400 ± 30 µm
Pad size: 100

100 µm

Chip surface is at V

potential.

(0, 0)

TEST

VSS

AO(AO1)

AO(AO2)

OUT1

OUT2

AI/SNZ

4- Stage

Divider

11- Stage

Divider

4- Stage

Divider

AO Duty

Control

Snooze

Counter

Output

Control

Input

Control

Alarm

Out

VDD

CF5746 Series

NIPPON PRECISION CIRCUITS--3

PIN DESCRIPTION

SPECIFICATIONS

Absolute Maximum Ratings

Electrical Characteristics

= 25

C, V

= 1.5 V, V

= 0 V, f

= 32.768 kHz unless otherwise noted

N a m e

Description

VDD

Positive supply voltage pin

VSS

Ground pin

Oscillator input pin

Oscillator output pin

OUT1

Motor output pin 1

OUT2

Motor output pin 2

AI/SNZ

Alarm/snooze input pin

AO (AO1)

Alarm output pin

AO (AO2)

Alarm output pin

TEST

Test pin

P arameter

S y m b o l

Condition

Rating

Unit

Supply voltage range

0.3 to 5.0

Input voltage range

to V

Operating temperature range

opr

30 to 70

Storage temperature range

stg

40 to 125

P arameter

S y m b o l

Condition

Rating

Unit

m i n

typ

m a x

Operating voltage

No load

1.2

2.0

Current consumption

1. All pins except the supply and crystal oscillator pins are open.

1.0

2.0

µA

Motor output current

MOT

= 1.2 V, R

= 200

±3.8

Alarm HIGH-level output current

= 1.2 V, V

= 0.7 V

0.8

1.5

Alarm LOW-level output current

2. CF5746AAB, ABA, BCA, AEA, AFA (AO2), AGA (AO2)

= 1.2 V, V

= 0.5 V

0.8

1.5

Alarm LOW-level output current

3. CF5746ADC, AFA (AO1), AGA (AO2)

µA

AI/SNZ HIGH-level input voltage

0.2

AI/SNZ LOW-level input voltage

+ 0.2

AI/SNZ HIGH-level output current

= V

1.5 V

Excluding
CF5746AFA,
AGA

µA

AI/SNZ LOW-level output current

= V

+ 1.5 V

µA

Oscillator frequency stability

f/f

= 1.2 to 2.0 V

0.5

ppm/0.1 V

VDD-to-XT pin built-in
capacitance

None

VDD-to-XT pin built-in
capacitance

Excluding CF5746ADC

CF5746ADC

CF5746 Series

NIPPON PRECISION CIRCUITS--4

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 t

31.25 ms, any alarm input or

snooze input signal is ignored. For t

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.

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).

Alarm output

The CF5746 Series devices feature a combination of
various alarm output options to cover a wide range of
clock specifications.

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.

Auto-stop function
After the alarm has been active continuously for
128 seconds, auto-stop mode becomes active and
the output stops.

C F 5 7 4 6 A A B

C F 5 7 4 6 A B A

C F 5 7 4 6 B C A

C F 5 7 4 6 A D C

C F 5 7 4 6 A E A

C F 5 7 4 6 A FA

C F 5 7 4 6 AG A

Alarm active level

LOW

HIGH

LOW

SNZ interface

Yes

SNZ time t

SNZ

(s)

256

SNZ release

Yes (2 s)

C F 5 7 4 6 A A B

C F 5 7 4 6 A B A

C F 5 7 4 6 B C A

C F 5 7 4 6 A D C

C F 5 7 4 6 A E A

C F 5 7 4 6 A FA

C F 5 7 4 6 AG A

Pins

AO1

AO2

AO1

AO2

AO1

AO2

AO1

AO2

Active level

HIGH

LOW

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

HIGH

LOW

HIGH

LOW

HIGH

Frequency f

(Hz)

4096

2048

Modulation f

(Hz)

8+1

Duty (%)

Step 1

12.5

6.26

12.5

6.26

Step 2

12.5

Step 3

Step 4

Step time
(s)

Step 1

0 to 7

0 to 3

0 to 7

Step 2

7 to 15

3 to 7

7 to 15

Step 3

15 to

2. AS = auto-stop

15 to AS

7 to 31

15 to AS 15 to AS 15 to AS

15 to AS

Step 4

31 to AS 31 to AS

Auto-stop t

STOP

(s)

128

CF5746 Series

NIPPON PRECISION CIRCUITS--5

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.

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.

TEST must be HIGH.

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.

Power-ON Clear Function

When power is first applied, the snooze state and
alarm auto-stop state are reset to their default values.

C F 5 7 4 6 A A B

C F 5 7 4 6 A B A

C F 5 7 4 6 B C A

C F 5 7 4 6 A D C

C F 5 7 4 6 A E A

C F 5 7 4 6 A FA

C F 5 7 4 6 AG A

Active level

HIGH

Needle period t

(s)

0.125

Pulsewidth t

(ms)

23.4375

31.25

50% duty

46.875

31.25

46.875

31.25

Movement

Step

Continuous

Step

T E S T = H I G H

O U T 1 = O U T 2 = H I G H

Motor output needle period

1/4

Alarm output

Unmodulated

Auto-stop time

1/1024

Snooze interval

1/1024

Device

AAB

ADC

AEA

AFA (AO1)

AGA (AO1)

ABA

AFA (AO2)

AGA (AO2)

BCA

AAB

ADC

AEA

AFA (AO1)

AGA (AO1)

ABA

AFA (AO2)

AGA (AO2)

BCA

CF5746 Series

NIPPON PRECISION CIRCUITS--7

NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to
improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for
the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits
are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision
Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification.
The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or
malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter,
including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or
indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies.

NIPPON PRECISION CIRCUITS INC.

4-3, 2-chome Fukuzumi
Koutou-ku, Tokyo 135-8430, Japan
Telephone: 03-3642-6661
Facsimile: 03-3642-6698

NC9417AE

1996.04

NIPPON PRECISION CIRCUITS INC.

Alarm/Snooze Input and Alarm Output

Alarm/Snooze Input (

Deboucing

Circuit)

SNZ

512Hz

AO, AO1

AI/ SNZ

62.5

msec

62.5

msec

62.5

msec

62.5

msec

SNZ

(Restart)

62.5

msec

sec

STOP

= 128

sec

SNZ

= 0

sec

AO1 , AO2

(DC Output)

*1: CF5746AFA, AGA
*2: CF5746ABA, BCA
*3: CF5746AAB, ABA, BCA, ADC, AEA
*4: CF5746AFA, AGA
*5: CF5746AAB, ABA, BCA, AEA, AFA, AGA

AI/ SNZ

(L to H)

AI/ SNZ

(H to L)

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