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MB3793-45PF-G-BND データシート(PDF) 11 Page - Fujitsu Component Limited.

部品番号 MB3793-45PF-G-BND
部品情報  Power Voltage Monitoring IC
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メーカー  FUJITSU [Fujitsu Component Limited.]
ホームページ  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

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MB3793-45
11
5.
Clock pulse input supplementation (Positive clock pulse)
s
s
s
s OPERATION SEQUENCE
1.
Positive clock pulse input
See “1. Basic operation (positive clock pulse)” under “s DIAGRAM”.
2.
Negative clock pulse input
See “2. Basic operation (negative clock pulse)” under “s DIAGRAM”.
The MB3793 operates in the same way whether it inputs positive or negative pulses.
3.
Clock monitoring
To use the MB3793 while monitoring only one clock, connect clock pins CK1 and CK2.
Although the MB3793 operates basically in the same way as when monitoring two clocks, it monitors the clock
signal at every other input pulse.
See “3. Single-clock input monitoring (positive clock pulse)” under “s DIAGRAM”.
4.
Description of Operations
The numbers given to the following items correspond to numbers (1) to (13) used in “s DIAGRAM”.
(1) The MB3793 outputs a reset signal when the supply voltage (VCC) reaches about 0.8 V (VCCL)
(2) If VCC reaches or exceeds the rise-time detected voltage VSH, the MB3793 starts charging the power-on re-
set hold time setting capacitor CTP. At this time, the output remains in a reset state. The VSH value is about
4.60 V.
(3) When CTP has been charged for a certain period of time TPR (until the CTP pin voltage exceeds the thresh-
old voltage (Vth) after the start of charging), the MB3793 cancels the reset (setting the RESET pin to “H”
level from “L” level).
CTW
CK1
*1
*2
CK2
VH
VL
Note: The MB3793 watchdog timer monitors Clock1 (CK1) and Clock2 (CK2) pulses alternately.
When a CK2 pulse is detected after detecting a CK1 pulse, the monitoring time setting capacity
(CTW) switches to charging from discharging.
When two consecutive pulses occur on one side of this alternation before switching, the second
pulse is ignored.
In the above figure, pulse *1 and *2 are ignored.


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