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MC74AC257D
Quad 2 Input Multiplexer with 3 State Outputs
-The MC74AC257/74ACT257 is a quad 2-input multiplexer with 3-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. Multiplexer Expansion by Tying Outputs Together Noninverting 3-State Outputs Outputs Source/Sink 24 mA ′ACT257 Has TTL Compatible Inputs
VCC I0c I1c Zc I0d I1d Zd I0a I1a Za I0b I1b Zb GND
PIN NAMES Common Data Select Input 3-State Output Enable Input
I0a–I0d Data Inputs from Source 0
I1a–I1d Data Inputs from Source 1
Za–Zd 3-State Multiplexer Outputs
TRUTH TABLEH = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
LOGIC SYMBOL
