74HCT7540

The 74HCT7540 is high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HCT7540 is octal Schmitt trigger inverting buffer/line drivers with 3-state outputs. The 3-state outputsare controlled by the output enable inputs OE₁ and OE₂.

A HIGH on OE_n causes the outputs to assume a high impedance OFF-state.

The Schmitt trigger action in the data inputs transforms slowly changing input signals into sharply defined jitter-free output signals.

The "7540" is identical to the "540" but has hysteresis on the data inputs.