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 t
ON
≤
31.25 ms, any alarm input or
snooze input signal is ignored. For t
ON
≥
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.
CF5746AAB
LOW
Yes
256
No
C F 5 7 4 6 A BA
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 active level
SNZ interface
SNZ time t
SNZ
(s)
SNZ release
Alarm output
The CF5746 Series devices feature a combination of
various alarm output options to cover a wide range of
clock specifications.
s
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.
Auto-stop function
After the alarm has been active continuously for
128 seconds, auto-stop mode becomes active and
the output stops.
CF5746AAB
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
–
–
128
C F 5 7 4 6 A BA
AO1
AO2
HIGH
HIGH
DC
DC
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
128
–
–
CF5746BCA
AO1
AO2
HIGH
HIGH
DC
DC
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
128
–
–
CF5746ADC
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
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
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
–
–
–
128
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
–
15 to AS
–
128
–
–
Pins
Active level
Frequency f
PW
(Hz)
Modulation f
CY
(Hz)
Step 1
Step 2
Duty (%)
Step 3
Step 4
Step 1
Step 2
Step time
(s)
Step 3
Step 4
Auto-stop t
STOP
(s)
15 to AS 15 to AS 15 to AS
–
128
–
–
31 to AS 31 to AS
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
NPC [ NIPPON PRECISION CIRCUITS INC ]
