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74HCT640DB 데이터시트(PDF) 3 Page - NXP Semiconductors |
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3 / 6 page March 1988 3 Philips Semiconductors Product specification Octal bus transceiver; 3-state; inverting 74HC/HCT640 PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 1 DIR direction control 2, 3, 4, 5, 6, 7, 8, 9 A0 to A7 data inputs/outputs 10 GND ground (0 V) 18, 17, 16, 15, 14, 13, 12, 11 B0 to B7 data inputs/outputs 19 OE output enable input (active LOW) 20 VCC positive supply voltage Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol. Fig.4 Functional diagram. FUNCTION TABLE Note 1. H = HIGH voltage level L = LOW voltage level X = don’t care Z = high impedance OFF-state inputs inputs/outputs OE DIR An Bn L L H L H X A=B inputs Z inputs B=A Z |
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