Fairchild/ON Semiconductor MM74HC540N

Buffer/Line Driver 8-CH Inverting 3-ST CMOS 20-Pin PDIP W Rail
IC, 74HC CMOS, 74HC540, DIP20, 6V; Logic Device Type:Buffer / Line Driver, Inverting; Supply Voltage Range:2V to 6V; Logic Case Style:DIP; No. of Pins:20; Operating Temperature Range:-40°C to 85°C; SVHC:No SVHC (15-Dec-2010); Base Number:74; Device Marking:74HC540; IC Generic Number:74HC540; Logic Function Number:540; Logic IC Base Number:74540; Logic IC Family:HC; Logic IC Function:Octal Inverting Buffer/Line Driver (3-State); No. of Gates:8; No. of Inputs:1; Operating Temperature Max:85°C; Operating Temperature Min:-40°C; Package / Case:DIP; Supply Voltage:6V; Supply Voltage Max:6V; Supply Voltage Min:2V; Termination Type:Through Hole
The MM74HC540 and MM74HC541 3-STATE buffers utilize advanced silicon-gate CMOS technology. They possess high drive current outputs which 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-impedance 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.