CD54HC540, CD74HC540, CD54HC541, CD74HC541, CD74HC.
Texas Instruments
CD74HCT540E - Octal Buffer and Line Drivers
CD54HC540, CD74HC540, CD54HC541, CD74HC541, CD74HCT540, CD54HCT541, CD74HCT541 SCHS189E – JANUARY 1998 – REVISED OCTOBER 2022 CDx4HC(T)541 High-Speed .