54AC257

www.DataSheet4U.com 54AC257 54ACT257 Quad 2-Input Multiplexer with TRI-STATE Outputs July 1998 54AC257 54ACT257 Quad 2-Input Multiplexer with TRI-STATE ® Outputs General Description The ’AC/’ACT257 is a quad 2-input multiplexer with TRI-STATE outputs. Four bits of data from two sources can be selected using a Common Data Select input. The four outputs present the selected data in true (noninverted) form. The outputs may be switched to a high impedance state by placing a logic HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems. Features n n n n n n ICC and IOZ reduced by 50% Multiplexer expansion by tying outputs together Noninverting TRI-STATE outputs Outputs source/sink 24 mA ’ACT257 has TTL-compatible inputs Standard Military Drawing (SMD) — ’AC257: 5962-88703 — ’ACT257: 5962-89689 Logic Symbols IEEE/IEC DS100286-1 DS100286-2 Pin Names S OE I0a–I0d I1a–I1d Za–Zd Description Common Data Select Input TRI-STATE Output Enable Input Data Inputs from Source 0 Data Inputs from Source 1 TRI-STATE Multiplexer Outputs TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100286 www.national.com Connection Diagrams Pin Assignment for DIP and Flatpak Functional Description The ’AC/’ACT257 is quad 2-input multiplexer with TRI-STATE outputs. It selects four bits of data from two so...