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M74HCT643C1R Datasheet(PDF) 2 Page - STMicroelectronics |
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M74HCT643C1R Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 11 page INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1 DIR Directional Control 2, 3, 4, 5, 6, 7, 8, 9 A1 to A8 Data Inputs/Outputs 18, 17, 16, 15, 14, 13, 12, 11 B1 to B8 Data Inputs/Outputs 19 G Output Enabel Input (Active LOW) 10 GND Ground (0V) 20 VCC Positive Supply Voltage IEC LOGIC SYMBOLS TRUTH TABLE INPUT FUNCTION OUTPUT G DIR A BUS B BUS HCT245 HCT640 HCT643 L L OUTPUT INPUT A = B A = B A = B L H INPUT OUTPUT B = A B = A B = A H X ZZ ZZ Z X: ”H” or ”L” Z: High impedance HCT245 HCT640 HCT643 M54/M74HCT245/640/643 2/11 |
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