datasheetbank_Logo     Integrated circuits, Transistor, Semiconductors Search and Datasheet PDF Download Site

54F251AFC View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
54F251AFC 8-Input Multiplexer with TRI-STATE® Outputs National-Semiconductor
National ->Texas Instruments National-Semiconductor
54F251AFC Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
Unit Loading Fan Out
Pin Names
S0 – S2
OE
I0 – I7
Z
Z
Description
Select Inputs
TRI-STATE Output Enable Input (Active LOW)
Multiplexer Inputs
TRI-STATE Multiplexer Output
Complementary TRI-STATE Multiplexer Output
54F 74F
UL
HIGH LOW
10 10
10 10
10 10
150 40 (33 3)
150 40 (33 3)
Input IIH IIL
Output IOH IOL
20 mA b0 6 mA
20 mA b0 6 mA
20 mA b0 6 mA
b3 mA 24 mA (20 mA)
b3 mA 24 mA (20 mA)
Functional Description
Truth Table
This device is a logical implementation of a single-pole 8-
position switch with the switch position controlled by the
Inputs
state of three Select inputs S0 S1 S2 Both assertion and
negation outputs are provided The Output Enable input
(OE) is active LOW When it is activated the logic function
provided at the output is
Z e OE(I0S0S1 S2 a I1S0S1S2 a
I2S0S1S2 a I3S0S1S2 a
I4S0S1S2 a I5S0S1S2 a
I6S0S1S2 a I7S0S1S2)
When the Output Enable is HIGH both outputs are in the
high impedance (High Z) state This feature allows multi-
plexer expansion by tying the outputs of up to 128 devices
together When the outputs of the TRI-STATE devices are
OE
S2
S1
S0
H
X
X
X
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
tied together all but one device must be in the high imped-
H e HIGH Voltage Level
ance state to avoid high currents that would exceed the
maximum ratings The Output Enable signals should be de-
signed to ensure there is no overlap in the active LOW por-
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
tion of the enable voltages
Logic Diagram
Outputs
Z
Z
Z
Z
I0
I0
I1
I1
I2
I2
I3
I3
I4
I4
I5
I5
I6
I6
I7
I7
TL F 9504 – 4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2
Direct download click here

 

Share Link : 

All Rights Reserved © datasheetbank.com 2014 - 2019 [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]