CF5746 Series
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.
s
s
FEATURES
s
s
s
32.768 kHz oscillator circuit
• R
f
and R
d
built-in
• Oscillator capacitance built-in
- C
D
= 30 pF (typ, excluding CF5746ADC)
- C
D
= 20 pF (typ, CF5746ADC)
s
s
s
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
XT pin C
G
(pF)
XT pin C
G
(pF)
Active level
Motor output Needle period t
CY
(s)
Pulsewidth t
PW
(ms)
Alarm active level
Pin type
SNZ interface
AI/SNZ input
SNZ time t
SNZ
(s)
Bounce delay (ms)
SNZ release
Pins
Active level
Frequency f
PW
(Hz)
Modulation f
CY
(Hz)
Step 1
Step 2
Duty (%)
Step 3
Step 4
Alarm output
Step 1
Step 2
Step time
Step 3
(s)
Built-in
capacitance
Step 4
I
OH
min (mA)
I
OL
min (mA)
Auto-stop t
STOP
(s)
Pad layout
Other
CF5746AAB
None
30
HIGH
1
23.4375
LOW
512 Hz
Yes
256
31.25
No
AO
AO
HIGH LOW
1
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
15 to
AS
AS
2
–
−
0.8
0.8
128
A
–
−
0.8
0.8
C F 5 7 4 6 A BA
None
30
HIGH
1
31.25
LOW
512 Hz
Yes
256
31.25
No
AO1
AO2
HIGH HIGH
DC
DC
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
−
0.8
0.8
128
A
–
–
−
0.8
0.8
CF5746BCA
None
30
–
0.125
50% duty
LOW
512 Hz
Yes
256
31.25
No
AO1
AO2
HIGH HIGH
DC
DC
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
CF5746ADC
None
20
HIGH
1
46.875
HIGH
512 Hz
No
256
31.25
No
AO
AO
HIGH LOW
1
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
7 to 31
7 to 31
CF5746AEA
None
30
HIGH
1
31.25
LOW
512 Hz
Yes
256
31.25
No
AO
AO
HIGH LOW
1
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
15 to
15 to
AS
AS
C F 5 7 4 6 A FA
None
30
HIGH
1
46.875
LOW
Pull-up
Yes
256
31.25
Yes (2 s)
AO1
AO2
HIGH HIGH
2048
DC
8+1
–
12.5
–
25
–
50
–
–
–
0 to 7
–
7 to 15
–
15 to
–
AS
–
−
0.8
0.002
128
A
–
−
0.8
0.8
C F 5 7 4 6 AG A
None
30
HIGH
1
31.25
LOW
Pull-up
Yes
256
31.25
Yes (2 s)
AO1
AO2
HIGH HIGH
2048
DC
8+1
–
6.26
–
12.5
–
50
–
–
–
0 to 7
–
7 to 15
–
15 to
–
AS
–
−
0.8
0.002
128
A
–
−
0.8
0.8
31 to
31 to
–
–
AS
AS
−
0.8
−
0.8
−
0.8
−
0.8
−
0.8
−
0.8
0.8
0.8
0.002 0.002
0.8
0.8
128
128
128
B
A
A
Power-ON clear, oscillator R
d
and R
f
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
NPC [ NIPPON PRECISION CIRCUITS INC ]
