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PDF SL74HC251 Data sheet ( Hoja de datos )
| Número de pieza | SL74HC251 | |
| Descripción | 8-Input Data Selector/Multiplexer with 3-State Outputs | |
| Fabricantes | System Logic Semiconductor | |
| Logotipo |  |
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SL74HC251
8-Input Data Selector/Multiplexer with 3-State Outputs
High-Performance Silicon-Gate CMOS
The SL74HC251 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 IN74HC251 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
SL74HC251N Plastic
SL74HC251D SOIC
TA = -55° to 125° C for all packages
LOGIC DIAGRAM
PIN ASSIGNMENT
PIN 16 =VCC
PIN 8 = GND
SLS
System Logic
Semiconductor
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 page  
SL74HC251
Figure 3. Switching Waveforms
Figure 4. Switching Waveforms
Figure 5. Test Circuit
Figure 6.Test Circuit
EXPANDED LOGIC DIAGRAM
SLS
System Logic
Semiconductor
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet SL74HC251.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SL74HC251 | 8-Input Data Selector/Multiplexer with 3-State Outputs | System Logic Semiconductor |
| SL74HC251D | 8-Input Data Selector/Multiplexer with 3-State Outputs | System Logic Semiconductor |
| SL74HC251N | 8-Input Data Selector/Multiplexer with 3-State Outputs | System Logic Semiconductor |
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