CF5746 Series
CMOS Analog Clock IC
NIPPON PRECISION CIRCUITS INC.
■ Alarm outputs
OVERVIEW
• 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
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.
■ Debouce circuit (AI/SNZ pin)
■ Test functions
• Shortening snooze time and auto-stop time
• Increasing motor speed (excluding
CF5746BCA)
FEATURES
■ 32.768 kHz oscillator circuit
• R and R built-in
f
d
• Oscillator capacitance built-in
- C = 30 pF (typ, excluding CF5746ADC)
■ Power-ON clear function
■ 1.5 V supply voltage
D
- C = 20 pF (typ, CF5746ADC)
D
■ Chip form
SERIES CONFIGURATION
CF5746AAB
None
30
CF5746ABA
None
30
CF5746BCA
None
30
CF5746ADC
None
20
CF5746AEA
None
30
CF5746AFA
None
30
CF5746AGA
None
30
XT pin CG (pF)
XT pin CG (pF)
Active level
Built-in
capacitance
HIGH
1
HIGH
1
–
HIGH
1
HIGH
1
HIGH
1
HIGH
1
Motor output Needle period tCY (s)
Pulsewidth tPW(ms)
Alarm active level
0.125
50% duty
LOW
512 Hz
Yes
23.4375
LOW
512 Hz
Yes
31.25
LOW
512 Hz
Yes
46.875
HIGH
512 Hz
No
31.25
LOW
512 Hz
Yes
46.875
LOW
Pull-up
Yes
31.25
LOW
Pull-up
Yes
Pin type
SNZ interface
AI/SNZ input
SNZ time tSNZ (s)
256
256
256
256
256
256
256
Bounce delay (ms)
SNZ release
Pins
31.25
No
31.25
No
31.25
No
31.25
No
31.25
No
31.25
Yes (2 s)
31.25
Yes (2 s)
AO
AO
AO1
AO2
AO1
AO2
AO
AO
AO
AO
AO1
AO2
AO1
AO2
Active level
HIGH LOW1 HIGH HIGH HIGH HIGH HIGH LOW1 HIGH LOW1 HIGH HIGH HIGH HIGH
Frequency fPW (Hz)
Modulation fCY(Hz)
Step 1
4096
8+1
12.5
25
4096
8+1
12.5
25
DC
–
DC
–
DC
–
DC
–
2048
8+1
6.26
12.5
25
2048
8+1
6.26
12.5
25
2048
8+1
6.26
12.5
50
2048
8+1
6.26
12.5
50
2048
8+1
12.5
25
DC
–
2048
8+1
DC
–
–
–
–
–
–
6.26
12.5
50
–
Step 2
Duty (%)
–
–
–
–
–
–
Step 3
50
50
–
–
–
–
50
–
–
Step 4
–
–
–
–
–
–
50
50
–
–
–
–
–
–
Alarm output
Step 1
Step 2
0 to 7 0 to 7
7 to 15 7 to 15
–
–
–
–
0 to 3 0 to 3 0 to 7 0 to 7 0 to 7
3 to 7 3 to 7 7 to 15 7 to 15 7 to 15
–
0 to 7
7 to 15
–
–
–
–
–
–
–
Step time
(s)
15 to
AS2
15 to
AS
15 to
AS
15 to
AS
15 to
AS
15 to
AS
Step 3
Step 4
–
–
–
–
–
–
–
–
7 to 31 7 to 31
–
–
–
–
31 to
AS
31 to
AS
–
–
–
–
–
–
IOH min (mA)
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
−0.8
IOL min (mA)
0.8
0.8
0.8
0.8
0.8
0.8
0.002 0.002
0.8
0.8
0.002
0.8
0.002
0.8
Auto-stop tSTOP (s)
128
A
128
A
128
B
128
A
128
A
128
A
128
Pad layout
Other
A
Power-ON clear, oscillator Rd and Rf built-in
1. AO has the opposite polarity to AO only when output (same phase when non-active).
2.AS = auto-stop
NIPPON PRECISION CIRCUITS—1