1. 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.
2. Features and benefits
• Wide supply voltage range from 2.0 V to 6.0 V
• CMOS low power dissipation
• High noise immunity
• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
• Complies with JEDEC standards:
• JESD8C (2.7 V to 3.6 V)
• JESD7A (2.0 V to 6.0 V)
• Input levels:
• For 74HC251: CMOS level
• For 74HCT251: TTL level
• Non-inverting data path
• ESD protection:
• • HBM JESD22-A114F exceeds 2000 V
• MM JESD22-A115-A exceeds 200 V
• Specified from -40 °C to +85 °C and from -40 °C to +125 °C