The MC74HC540A/D is an eight-bit inverting buffer/line driver/line receiver designed by American Semiconductor Components Industry Company. It is pin compatible with LS540. External pull-up resistors make it compatible with LSTTL outputs. It is designed to be used with 3-state memory address drivers, clock drivers, and other bus-oriented systems. The device features inputs and outputs on opposite sides of the package and two ANDed active-low output enables. It is similar in function to the HC541A, which has noninverting outputs.
The MC74HC540A is an octal 3‑state inverting buffer/line driver/receiver designed for bus‑oriented systems such as memory address drivers and clock drivers. It features inputs and outputs on opposite sides of the package and two active‑low output enables.
The document lists the device’s electrical ratings, recommended operating conditions, DC and AC characteristics, propagation delays, power dissipation, and mechanical package dimensions for PDIP‑20, SO‑20, and TSSOP‑20 variants.
| Operating Voltage Range | 2.0 V – 6.0 V |
|---|---|
| Output Drive Capability | 15 LSTTL loads |
| Low Input Current | 1 pA |
| Maximum Supply Voltage (Voc) | -0.5 V to +7.0 V |
| Power Dissipation (PDIP, 85 °C) | 750 mW |
The device is specified for a supply voltage between 2.0 V and 6.0 V.
It can drive up to 15 LSTTL loads.