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CF5761 series
CMOS Analog Clock IC with Alarm Function
| The CF5761 series are analog clock ICs with alarm functions that derive their timing from a standard 32.768kHz oscillator element. Two kinds of alarm output are available and can be selected using a control pin. The series lineup comprises devices with various alarm patterns and motor outputs for a wide range of clock specifications. They support convenient functions, such as input chattering elimination circuit and power-on clear functions. They are fabricated using Molybdenum-gate CMOS process, realizing low power consumption. |
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32.768kHz fundamental frequency oscillator |
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Feedback resistor and oscillator capacitor CG and CD built-in |
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Supports various alarms: piezo-alarm, electromagnetic speaker |
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Snooze function |
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Switchable alarm function using SEL pin |
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Alarm auto-stop function |
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Input chattering elimination circuit (SEL, AI, SN) |
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Test function |
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1.2 to 3.6V operating supply voltage |
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Molybdenum-gate CMOS process |
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Package:Chip form |
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CF5761CA |
CF5761EA |
CF5761HA |
CF5761LB |
CF5761MB |
CF5761NB |
| Built-in capacitance1 |
CG[pF] |
4 |
4 |
4 |
4 |
4 |
4 |
| CD[pF] |
27 |
27 |
27 |
34 |
34 |
34 |
| Motor output |
Active level |
- |
LOW |
LOW |
LOW |
- |
LOW |
| Needle period tCY[s] |
0.0625(8Hz sweep) |
1 |
10 |
1 |
0.0625(8Hz sweep) |
1 |
| Pulsewidth tPW[ms] |
62.5(50% duty) |
23.4 |
13.7 |
31.3 |
62.5(50% duty) |
23.4 |
| AI input |
Active level |
HIGH
(pull-down) |
HIGH
(pull-down) |
HIGH
(pull-down) |
LOW
(pull-up) |
LOW
(pull-up) |
LOW
(pull-up) |
| Bounce delay[ms] |
62.5 |
62.5 |
62.5 |
62.5 |
62.5 |
62.5 |
| SN input |
Active level |
HIGH
(pull-down) |
HIGH
(pull-down) |
HIGH
(pull-down) |
LOW
(pull-up) |
LOW
(pull-up) |
LOW
(pull-up) |
Snooze time
tSNZ[s] |
300 |
300 |
300 |
300 |
300 |
300 |
| Bounce delay [ms] |
62.5 |
62.5 |
62.5 |
62.5 |
62.5 |
62.5 |
| Alarm output |
SEL pin |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
LOW |
HIGH |
| Application2 |
*1 |
*1 |
*2 |
*1 |
*1 |
*1 |
*3 |
*1 |
*3 |
*1 |
*3 |
*3 |
1. CG and CD built-in parasitic capacitance (CG = CD = 4pF)
2. *1:Simple alarm, *2:Step tone alarm, *3:Step volume alarm
·Analog clock with alarm and snooze functions
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Datasheet(PDF 102KB)
