The 74HC/HCT240 are 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 Philips 74HC/HCT240 is a high-speed Si-gate CMOS integrated circuit designed as an octal inverting buffer/line driver. These devices feature 3-state outputs controlled by active-low output enable inputs, allowing them to be used as bus drivers. They are pin compatible with low power Schottky TTL (LSTTL) and comply with JEDEC standard no. 7A.
| Output capability | bus driver |
|---|---|
| Logic category | MSI |
| Device type | Octal inverting buffer/line driver |
| Output state | 3-state |
| Input capacitance | 3.5 pF |
| Power dissipation capacitance | 30 pF |
The 74HC/HCT240 is identical to the 74HC/HCT244 but has inverting outputs.
The 3-state outputs are controlled by the output enable inputs 1OE and 2OE.
A HIGH on nOE causes the outputs to assume a high impedance OFF-state.