MC74ACT251 Motorola, MC74ACT251 Datasheet

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MC74ACT251

Manufacturer Part Number
MC74ACT251
Description
8-Input Multiplexer
Manufacturer
Motorola
Datasheet
( DataSheet : www.DataSheet4U.com )
www.DataSheet4U.com
8 Input Multiplexer
with 3 State Outputs
provides, in one package, the ability to select one bit of data from up to eight
sources. It can be used as a universal function generator to generate any logic
function of four variables. Both true and complementary outputs are provided.
PIN NAMES
S 0 –S 2
OE
I 0 –I 7
Z
Z
TRUTH TABLE
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Multifunctional Capability
On-Chip Select Logic Decoding
Inverting and Noninverting 3-State Outputs
Outputs Source/Sink 24 mA
OE
V CC
ACT251 Has TTL Compatible Inputs
The MC74AC251/74ACT251 is a high-speed 8-input digital multiplexer. It
H
16
L
L
L
L
L
L
L
L
I 3
1
15
Select Inputs
3-State Output Enable Input
Multiplexer Inputs
3-State Multiplexer Output
Complementary 3-State Multiplexer Output
I 4
I 2
2
S 2
X
H
H
H
H
L
L
L
L
Inputs
14
I 5
I 1
3
S 1
H
H
H
H
X
L
L
L
L
13
I 6
I 0
4
12
I 7
5
Z
S 0
X
H
H
H
H
L
L
L
L
S 0
11
6
Z
I 0
I 1
I 2
I 3
I 4
I 5
I 6
I 7
Z
Z
Outputs
OE
S 1
10
7
GND
S 2
I 0
I 1
I 2
I 3
I 4
I 5
I 6
I 7
Z
Z
9
8
FACT DATA
5-1
MC74ACT251
S 0
S 1
S 2
MC74AC251
OE I 0 I 1 I 2 I 3 I 4 I 5 I 6 I 7
MULTIPLEXER WITH
3-STATE OUTPUTS
LOGIC SYMBOL
CASE 751B-05
CASE 648-08
Z
N SUFFIX
D SUFFIX
8-INPUT
PLASTIC
PLASTIC
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Z

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MC74ACT251 Summary of contents

Page 1

... FACT DATA 5-1 MC74AC251 MC74ACT251 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS N SUFFIX CASE 648-08 PLASTIC D SUFFIX CASE 751B-05 PLASTIC LOGIC SYMBOL ...

Page 2

... Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. MC74AC251 MC74ACT251 When the Output Enable is HIGH, both outputs are in the high impedance (High Z) state. This feature allows multiplexer expansion by tying the outputs 128 devices together. ...

Page 3

... MC74AC251 MC74ACT251 MAXIMUM RATINGS* Symbol Supply Voltage (Referenced to GND Input Voltage (Referenced to GND) V out DC Output Voltage (Referenced to GND Input Current, per Pin I out DC Output Sink/Source Current, per Pin GND Current per Output Pin T stg Storage Temperature * Maximum Ratings are those values beyond which damage to the device may occur ...

Page 4

... MC74AC251 MC74ACT251 DC CHARACTERISTICS Symbol Symbol Parameter Parameter V IH Minimum High Level Input Voltage Input Voltage V IL Maximum Low Level Input Voltage Input Voltage V OH Minimum High Level Output Voltage Output Voltage V OL Maximum Low Level Output Voltage Output Voltage I IN Maximum Input ...

Page 5

... MC74AC251 MC74ACT251 AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) Symbol Symbol Parameter Parameter Propagation Delay t PLH t PLH Propagation Delay t PHL t PHL Propagation Delay t PLH t PLH Propagation Delay t PHL t PHL ...

Page 6

... MC74AC251 MC74ACT251 DC CHARACTERISTICS Symbol Symbol Parameter Parameter V IH Minimum High Level Input Voltage Input Voltage V IL Maximum Low Level Input Voltage Input Voltage V OH Minimum High Level Output Voltage Output Voltage V OL Maximum Low Level Output Voltage Output Voltage I IN Maximum Input ...

Page 7

... MC74AC251 MC74ACT251 AC CHARACTERISTICS (For Figures and Waveforms — See Section 3) Symbol Symbol Parameter Parameter Propagation Delay t PLH t PLH Propagation Delay t PHL t PHL Propagation Delay t PLH Propagation Delay ...

Page 8

... MC74AC251 MC74ACT251 –A– 0.25 (0.010) –A– –T– SEATING PLANE 0.25 (0.010 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “ ...

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