The MM74HC540 and MM74HC541 are 3-STATE buffers that use advanced silicon-gate CMOS technology. They have high drive current outputs that enable high-speed operation even when driving large bus capacitances. These circuits achieve speeds comparable to low power Schottky devices, while retaining the advantage of CMOS circuitry, i.e., high noise immunity, and low power consumption. Both devices have a fanout of 15 LS-TTL equivalent inputs. The MM74HC540 is an inverting buffer and the MM74HC541 is a non-inverting buffer. The 3-STATE control gate operates as a two-input NOR such that if either G1 or G2 are HIGH, all eight outputs are in the high-imped- ance state. In order to enhance PC board layout, the MM74HC540 and MM74HC541 offers a pinout having inputs and outputs on opposite sides of the package. All inputs are protected from damage due to static discharge by diodes to VCC and ground.
This document is a datasheet for the Fairchild MM74HC540 (Inverting Octal 3-STATE Buffer) and MM74HC541 (Non-Inverting Octal 3-STATE Buffer). These circuits utilize advanced silicon-gate CMOS technology to achieve high-speed operation comparable to low power Schottky devices while maintaining high noise immunity and low power consumption. Both devices feature a fanout of 15 LS-TTL equivalent inputs and are designed for connection to system buses.
| Typical propagation delay | 12 ns |
|---|---|
| Power supply range | 2-6V |
| Maximum quiescent current | 80 uA |
| Output current | 6 mA |
| Fanout | 15 LS-TTL equivalent inputs |
The MM74HC540 is an inverting buffer, while the MM74HC541 is a non-inverting buffer.
The maximum output current per pin is 6 mA.
The wide power supply range is 2-6V.
The typical propagation delay is 12 ns.