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IN74AC251 Datasheet(PDF) 1 Page - IK Semicon Co., Ltd |
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IN74AC251 Datasheet(HTML) 1 Page - IK Semicon Co., Ltd |
1 / 6 page TECHNICAL DATA IN74AC251 8-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS ORDERING INFORMATION IN74AC251N Plastic IN74AC251D SOIC TA = -40° to 85° C for all packages The IN74AC251 is identical in pinout to the LS/ALS251, HC/HCT251. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALS outputs. The device selects one of the eight binary Data Inputs, as determined by the Address Inputs. The Output Enable pin must be at a low level for the selected data to appear at the outputs. If Output Enable is high, the Y and the Y outputs are in the high-impedance state. This 3-State feature allows the IN74AC251 to be used in bus-oriented systems. • Outputs Directly Interface to CMOS, NMOS, and TTL • Operating Voltage Range: 2.0 to 6.0 V • Low Input Current: 1.0 μA; 0.1 μA @ 25°C • High Noise Immunity Characteristic of CMOS Devices • Outputs Source/Sink 24 mA PIN ASSIGNMENT FUNCTION TABLE Inputs Outputs A2 A1 A0 Output Enable Y Y X X X H Z Z L L L L D0 D0 L L H L D1 D1 L H L L D2 D2 L H H L D3 D3 H L L L D4 D4 H L H L D5 D5 H H L L D6 D6 H H H L D7 D7 D0,D1...D7=the level of the respective D input Z = high-impedance state X = don’t care LOGIC DIAGRAM PIN 16 =VCC PIN 8 = GND Rev. 00 |
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