IN74HC251A

TECHNICAL DATA IN74HC251A 8-Input Data Selector/Multiplexer with 3-State Outputs High-Performance Silicon-Gate CMOS The IN74HC251A is identical in pinout to the LS/ALS251. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL 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 IN74HC251A 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 High Noise Immunity Characteristic of CMOS Devices ORDERING INFORMATION IN74HC251AN Plastic IN74HC251AD SOIC TA = -55° to 125° C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs A2 X L L L L PIN 16 =VCC PIN 8 = GND A1 X L L H H L L H A0 X L H L H L H L OE H L L L L L L L Outputs Y Z D0 D1 D2 D3 D4 D5 D6 Y Z D0 D1 D2 D3 D4 D5 D6 w w w .d e e h s a t a . u t4 m o c H H H H H H L D7 D7 D0,D1...D7=the level of the respective D input Z = high-impedance state X = don’t care 1 www.DataSheet4U.com IN74HC251A MAXIMUM RATINGS* Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL * Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) ...