The U74HC540 is an octal buffer and line driver with inverting 3-tate outputs from UNISONIC TECHNOLOGIES CO., LTD. The 3-state output is controlled by output enable inputs 1 OE and OE2, all eight outputs will be in high-impedance when either of the 2 inputs is applied with high voltage.
The U74HC540 CMOS IC provides octal buffers and line drivers with inverting 3‑state outputs. Output enable inputs OF1 and OF2 control the high‑impedance state, allowing the device to act as a bus driver.
The datasheet lists ordering options, pin configuration, absolute maximum ratings, recommended operating conditions, electrical and switching characteristics, and test waveforms. It also includes a disclaimer regarding usage limits and liability.
| Operation voltage range | 2 V ~ 6 V |
|---|---|
| High‑current 3‑state outputs | Supported |
| Inverting outputs | Supported |
| Supply voltage (absolute max) | -0.5 V ~ 7 V |
| Input clamp current (max) | +20 mA |
| Output clamp current (max) | +20 mA |
| Output current (max) | +35 mA |
| Storage temperature range | -65 °C ~ +150 °C |
| Operating temperature range | -40 °C ~ 85 °C |
| Input leakage current (typ) | 0.1 nA |
| Output leakage current (typ) | 0.01 µA |
The recommended supply voltage is 2 V to 6 V.
The maximum output current is 35 mA.