General description
The 74HC251; 74HCT251 is an 8-bit multiplexer with eight binary inputs (I0 to I7), three select inputs (S0 to S2) and an output enable input (OE). The select inputs select one of the eight binary inputs and route it to the complementary outputs (Y and Y). A HIGH on OE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.
   
Features and benefits
■ Input levels:
    ◆ For 74HC251: CMOS level
    ◆ For 74HCT251: TTL level
■ Low-power dissipation
■ Non-inverting data path
■ Specified in compliance with JEDEC standard no. 7A
■ ESD protection:
    ◆ HBM JESD22-A114F exceeds 2 000 V
    ◆ MM JESD22-A115-A exceeds 200 V
■ Multiple package options
■ Specified from -40°C to +85°C and from -40°C to +125°C