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M74HCT646 Datasheet(PDF) 4 Page - STMicroelectronics |
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M74HCT646 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 12 page PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1 CLOCK AB A to B Clock Input (LOW to HIGH, Edge-Trigged) 2 SELECT AB Select A to B Source Input 3 DIR Direction Control Input 4, 5, 6, 7, 8, 9, 10, 11 A1 to A8 A data Inputs/Outputs 20, 19, 18, 17, 16, 15, 14, 13 B1 to B8 B Data Inputs/Outputs 21 G Output Enable Input (Active LOW) 22 SELECT BA Select B to A Source Input 23 CLOCK BA B to A Clock Input (LOW to HIGH, Edge-Triggered) 12 GND Ground (0V) 24 VCC Positive Supply Voltage IEC LOGIC SYMBOLS HCT646 HCT648 M74HCT646/648 4/12 |
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