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part number : 4538 Description : Dual precision monostable multivibrator with Schmitt-trigger inputs.Retriggerable, resettable.For 74HC4538 the Cext pins may be grounded.
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1Cext| 1 16| VCC
1RCext| 2 15|2Cext
1RST| 3 14|2RCext
1TR| 4 13| 2RST
/1TR| 5 12| 2TR
1Q| 6 11| /2TR
/1Q| 7 10| 2Q
GND| 8 9| /2Q
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