Board-level buffer for 5V and 3.3V mixed-voltage buses
The CD74HC540M96 is an 8-bit inverting buffer with 3-state outputs from Texas Instruments' 74HC family, designed to drive bus lines or buffer memory address and data lines in mixed-voltage systems operating between 2V and 6V.
Housed in a 20-SOIC wide-body (7.50 mm body width), the footprint matches JEDEC MS-013 — the 1.27 mm pitch is layout-friendly on two-layer boards, with the 3-state control pin (pin 1) and output-enable bar (pin 19) accessible at opposite corners for easy routing. Surface-mount assembly with standard reflow profile; the SOIC package has no exposed pad, so thermal dissipation relies on the copper traces and vias under the body — keep the trace width at least 0.020 inch per output for the 7.8 mA load.