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PDF IN74HC251A Data sheet ( Hoja de datos )
| Número de pieza | IN74HC251A | |
| Descripción | 8-1 Data Selector/Multiplexer | |
| Fabricantes | IK Semiconductor | |
| Logotipo |  |
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TECHNICAL DATA
8-Input Data Selector/Multiplexer
with 3-State Outputs
High-Performance Silicon-Gate CMOS
IN74HC251A
The IN74HC251A is identical in pinout to the LS/ALS251. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
The device selects one of the eight binary Data Inputs, as determined
by the Address Inputs. The Output Enable pin must be at a low level for
the selected data to appear at the outputs. If Output Enable is high, the Y
and the Y outputs are in the high-impedance state. This 3-State feature
allows the IN74HC251A to be used in bus-oriented systems.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
IN74HC251AN Plastic
IN74HC251AD SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
www.datasheet4uPP.IINcN8o16=m=GVNCDC
FUNCTION TABLE
Inputs
Outputs
A2 A1 A0 OE Y Y
XX X H Z Z
LL L
L D0 D0
LL H
L D1 D1
LH L
L D2 D2
LH H
L D3 D3
HL L
L D4 D4
HL H
L D5 D5
HH L
L D6 D6
HH H
L D7 D7
D0,D1...D7=the level of the respective D
input
Z = high-impedance state
X = don’t care
1
1 page  
IN74HC251A
Figure 3. Switching Waveforms
Figure 4. Switching Waveforms
Figure 5. Test Circuit
Figure 6.Test Circuit
EXPANDED LOGIC DIAGRAM
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IN74HC251A.PDF ] | |
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