CF5761 Datasheet, PDF (9/10 Pages) Nippon Precision Circuits Inc – CMOS Analog Clock IC with Alarm Function

CF5761 series
Test Function
The CF5761 series have a test mode of operation where the output cycles are compressed. T1 has a built-in
chattering elimination circuit to prevent incorrect operation due to input chatter. When T1 goes HIGH for an
interval of 31.25ms or greater, test mode is invoked. When T1 becomes open circuit, normal mode operation
resumes immediately and a 256Hz signal is output on T1.
T1
Function
HIGH
Motor outputs: In step movement devices, the output runs 16 times faster with normal pulsewidth. In sweep movement devices,
the output runs 16 times faster with 50% duty pulsewidth.
Alarm outputs: Alarm operates at the same frequency with modulation frequency 16 times faster and step output changes 8 times
faster (CF5761EA, LB, NB) or 4 times faster (CF5761MB).
Snooze time, auto-stop time¹: 281.25ms (CF5761EA, LB, NB) or 562.5ms (CF5761MB) in step output alarm mode, and
140.625ms in other modes.
Open circuit 256Hz output (normal operation)
1. The auto-stop time applies only to CF5761 versions that support the auto-stop function. See the series lineup table.
TYPICAL APPLICATION CIRCUITS
Piezo-electric speaker
Electromagnetic speaker
CG
X'tal
XT XTN VDD
AI
AO1
SN
AO2
SEL
O1
AO3
M
O2
VSS
CG
X'tal
XT XTN VDD
AI
AO1
SN
AO2
SEL
O1
AO3
M
O2
VSS
Motor bell
CG
X'tal
XT XTN VDD
AI
AO1
SN
AO2
SEL
O1
AO3
M
O2
VSS
Motorbell
M
Melody alarm
CG
X'tal
XT XTN VDD
AI
AO1
SN
AO2
SEL
O1
AO3
M
O2
VSS
VDD
Melody IC
F
VSS
SEIKO NPC CORPORATION —9