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KK74AC257

Features: • Outputs Directly Interface to CMOS, NMOS, and TTL• Operating Voltage Range: 2.0 to 6.0 V• Low Input Current: 1.0 A; 0.1 A @ 25°C• High Noise Immunity Characteristic of CMOS Devices• Output Source/Sink 24 mAPinoutSpecifications Symbol Parameter Min ...

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SeekIC No. : 004385720 Detail

KK74AC257: Features: • Outputs Directly Interface to CMOS, NMOS, and TTL• Operating Voltage Range: 2.0 to 6.0 V• Low Input Current: 1.0 A; 0.1 A @ 25°C• High Noise Immunity Characterist...

KK74AC257 Data Sheet

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Part Number:
KK74AC257
Supply Ability:
5000

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Product Details

Description



Features:

• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 A; 0.1 A @ 25°C
• High Noise Immunity Characteristic of CMOS Devices
• Output Source/Sink 24 mA


Pinout

Connection Diagram


Specifications

Symbol Parameter Min Max Unit
VCC DC Supply Voltage (Referenced to GND) 2.0 6.0 V
VIN, VOUT DC Input Voltage, Output Voltage (Referenced to GND) 0 VCC V
TJ Junction Temperature (PDIP)   140
TA Operating Temperature, All Package Types -40 +85
IOH Output Current - High   -24 mA
IOL Output Current - Low   24 mA
tr, tf Input Rise and Fall Time * (except Schmitt Inputs)
VCC =3.0 V VCC =4.5 V VCC =5.5 V		 0 0 0 150 40 25 ns/V
* VIN from 30% to 70% VCC


Description

The KK74AC257 is identical in pinout to the LS/ALS257, HC/HCT257. The KK74AC257 inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALS outputs.

This KK74AC257 selects a (4-bit) nibble from either the A or B inputs as determined by the Select input. The nibble is resented 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.




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