The 74HC/HCT125 is a high-speed Si-gate CMOS device with 3-state outputs. It has four non-inverting buffer/line drivers that can drive high load capacitances.
The Philips 74HC/HCT125 is a high-speed Si-gate CMOS device featuring four non-inverting buffers with 3-state outputs. These devices are pin compatible with low power Schottky TTL (LSTTL) and are specified in compliance with JEDEC standard no. 7A. The 3-state outputs are controlled by active LOW output enable inputs, allowing the outputs to assume a HIGH impedance OFF-state when enabled.
The document provides detailed technical specifications including propagation delay, input capacitance, and power dissipation capacitance for both 74HC and 74HCT variants. It also includes pin descriptions, functional diagrams, logic symbols, and AC/DC characteristic tables under various temperature conditions.
| Output capability | bus driver |
|---|---|
| Logic category | MSI |
| Propagation delay (typical) | 19 ns |
| Input capacitance | 3.5 pF |
| Power dissipation capacitance per buffer | 22 pF |
| Propagation delay (min for 74HC) | 30 ns |
| Propagation delay (typ for 74HCT) | 15 ns |
The logic category is MSI (Medium Scale Integration).
The 3-state outputs are controlled by the output enable input (nOE), where a HIGH at nOE causes the outputs to assume a HIGH impedance OFF-state.