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CF5746AAB Datasheet(PDF) 4 Page - Nippon Precision Circuits Inc |
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CF5746AAB Datasheet(HTML) 4 Page - Nippon Precision Circuits Inc |
4 / 7 page 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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