KK74ACT251

TECHNICAL DATA www.DataSheet4U.com 8-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS The KK74ACT251 is identical in pinout to the LS/ALS251, HC/HCT251. The KK74ACT251 may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. 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 KK74ACT251 to be used in bus-oriented systems. TTL/NMOS Compatible Input Levels Outputs Directly Interface to CMOS, NMOS, and TTL Operating Voltage Range: 4.5 to 5.5 V Low Input Current: 1.0 µA; 0.1 µA @ 25°C Outputs Source/Sink 24 mA KK74ACT251 ORDERING INFORMATION KK74ACT251N Plastic KK74ACT251D SOIC TA = -40° to 85° C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs A2 X L L L L H PIN 16 =VCC PIN 8 = GND H H A1 X L L H H L L H A0 X L H L H L H L Output Enable 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 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 KK74ACT251 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)...