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CF5746AAB Datasheet(PDF) 4 Page - Nippon Precision Circuits Inc

Part No. CF5746AAB
Description  CMOS Analog Clock IC
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Maker  NPC [Nippon Precision Circuits Inc]
Homepage  http://www.npc.co.jp/en
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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 tON ≤ 31.25 ms, any alarm input or
snooze input signal is ignored. For tON ≥ 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.
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.
s
Auto-stop function
After the alarm has been active continuously for
128 seconds, auto-stop mode becomes active and
the output stops.
CF5746AAB
CF5746AB A
CF5746BCA
CF5746ADC
CF5746AEA
CF5746AFA
CF5746AG A
Alarm active level
LOW
LOW
LOW
HIGH
LOW
LOW
LOW
SNZ interface
Yes
Yes
Yes
No
Yes
Yes
Yes
SNZ time tSNZ(s)
256
256
256
256
256
256
256
SNZ release
No
No
No
No
No
Yes (2 s)
Yes (2 s)
CF5746AAB
CF5746AB A
CF5746BCA
CF5746ADC
CF5746AEA
CF5746AFA
CF5746AG A
Pins
AO
AO
AO1
AO2
AO1
AO2
AO
AO
AO
AO
AO1
AO2
AO1
AO2
Active level
HIGH
LOW1
1. AO has the opposite polarity to AO only when output (same phase when non-active).
HIGH
HIGH
HIGH
HIGH
HIGH
LOW1
HIGH
LOW1
HIGH
HIGH
HIGH
HIGH
Frequency fPW (Hz)
4096
4096
DC
DC
DC
DC
2048
2048
2048
2048
2048
DC
2048
DC
Modulation fCY (Hz)
8+1
8+1
––––
8+1
8+1
8+1
8+1
8+1
8+1
Duty (%)
Step 1
12.5
12.5
––––
6.26
6.26
6.26
6.26
12.5
6.26
Step 2
25
25
––––
12.5
12.5
12.5
12.5
25
12.5
Step 3
50
50
––––
25
25
50
50
50
50
Step 4
––––––
50
50
––––––
Step time
(s)
Step 1
0 to 7
0 to 7
––––
0 to 3
0 to 3
0 to 7
0 to 7
0 to 7
0 to 7
Step 2
7 to 15
7 to 15
––––
3 to 7
3 to 7
7 to 15
7 to 15
7 to 15
7 to 15
Step 3
15 to
AS2
2. AS = auto-stop
15 to AS
––––
7 to 31
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 tSTOP(s)
128
128
128
128
128
128
128




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