逻辑
RS1G123
The RS1G123 is a single retriggerable monostable multivibrator designed for 2V to 5.5V VCC operation. This monostable multivibrator features output pulse-duration control by three methods. In the first method, the A̅ input is low, and the B input goes high. In the second method, the B input is high, and the A̅ input goes low. In the third method, the A̅ input is low, the B input is high, and the clear (CLR ̅̅̅̅̅̅) input goes high.
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