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IN74ACT257

IK Semiconductor
Part Number IN74ACT257
Manufacturer IK Semiconductor
Description Quad 2-1 Data Selector/Multiplexer
Published Dec 8, 2005
Detailed Description TECHNICAL DATA IN74ACT257 Quad 2-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS The...
Datasheet PDF File IN74ACT257 PDF File

IN74ACT257
IN74ACT257


Overview
TECHNICAL DATA IN74ACT257 Quad 2-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS 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 highimpedance 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 FUNCTION TABLE Inputs Output Enable H L Select X L H Outputs Y0-Y3 Z A0-A3 B0-B3 w w w .
d e e h s a t a .
u t4 PIN 16 =VCC PIN 8 = GND m o c L X=don’t care Z = high-impedance state A0-A3,B0-B3=the levels of the respective Nibble Inputs 1 www.
DataSheet4U.
com IN74ACT257 MAXIMUM RATINGS* Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL * Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC Supply Current, VCC and GND Pins Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ Storage Temperature Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package) Value -0.
5 to +7.
0 -0.
5 to VCC +0.
5 -0.
5 to VCC +0.
5 ±20 ±50 ±50 750 500 -65 to +150 260 Unit V V V mA mA mA mW °C °C Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C SOIC Package: : - 7 ...


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