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PDF IN74ACT257 Data sheet ( Hoja de datos )
| Número de pieza | IN74ACT257 | |
| Descripción | Quad 2-1 Data Selector/Multiplexer | |
| Fabricantes | IK Semiconductor | |
| Logotipo |  |
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TECHNICAL DATA
Quad 2-Input Data Selector/Multiplexer
with 3-State Outputs
High-Speed Silicon-Gate CMOS
IN74ACT257
The IN74ACT257 is identical in pinout to the LS/ALS257,
HC/HCT257. The IN74ACT257 may be used as a level converter for
interfacing TTL or NMOS outputs to High Speed CMOS inputs.
This device selects a (4-bit) nibble from either the A or B inputs as
determined by the Select input. The nibble is presented at the outputs in
noninverted from when the Output Enable pin is at a low level. A high
level on the Output Enable pin switches the outputs into the high-
impedance state.
• TTL/NMOS Compatible Input Levels
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 4.5 to 5.5 V
• Low Input Current: 1.0 µA; 0.1 µA @ 25°C
• Outputs Source/Sink 24 mA
ORDERING INFORMATION
IN74ACT257N Plastic
IN74ACT257D SOIC
TA = -40° to 85° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
www.datasheet4uPP.IINcN8o16=m=GVNCDC
FUNCTION TABLE
Inputs
Outputs
Output
Enable
Select Y0-Y3
H XZ
L L A0-A3
L H B0-B3
X=don’t care
Z = high-impedance state
A0-A3,B0-B3=the levels of the respective
Nibble Inputs
1
1 page  
IN74ACT257
Figure 3. Switching Waveforms
EXPANDED LOGIC DIAGRAM
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IN74ACT257.PDF ] | |
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