https://twistywristarcade.com/74ls-series/576-74ls253.html
74LS253
74LS253 Dual 4-Line To 1-Line Data Selectors/Multiplexers With 3-State Outputs 16 Pin DIP Package
https://www.triopak.fi/fi/tuote/74LS253
Dual 4-to-1 Data Selector/Multiplexer, DIP16 / 74LS253 - Triopak Oy
LS-TTL logiikka Vdd 4,75-5,25 VDC 2x 4-to-1 Data Selector/multiplexer DIL-16
dualdata