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CD74HC257

Features: • Buffered Inputs• Typical Propagation Delay ( In to Output ) = 12ns at VCC = 5V, CL = 15pF, TA = 25oC• Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads• W...

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SeekIC No. : 004312006 Detail

CD74HC257: Features: • Buffered Inputs• Typical Propagation Delay ( In to Output ) = 12ns at VCC = 5V, CL = 15pF, TA = 25oC• Fanout (Over Temperature Range) - Standard Outputs . . . . . . . ....

CD74HC257 Data Sheet

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Part Number:
CD74HC257
Supply Ability:
5000

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Product Details

Description



Features:

• Buffered Inputs
• Typical Propagation Delay ( In to Output ) = 12ns at VCC = 5V, CL = 15pF, TA = 25oC
• Fanout (Over Temperature Range)
    - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
    - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55 to 125
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
    - 2V to 6V Operation
    - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
• HCT Types
    - 4.5V to 5.5V Operation
    - Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min)
    - CMOS Input Compatibility, Il 1mA at VOL, VOH


Pinout

Connection Diagram


Specifications

DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
DC Input Diode Current, IIK
For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, IOK
For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . ...±20mA
DC Output Source or Sink Current per Output Pin, IO
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA
DC VCC or Ground Current, ICC. . . . . . . . . . . . . . . . . . . . . . . ±50mA 


Description

The 'HC257 and 'HCT257 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select Input (S). The Output Enable input (OE) is active LOW. When OE is HIGH, all of the outputs (1Y-4Y) are in the high impedance state regardless of all other input conditions.

Moving data from two groups of registers to four common output buses is a common use of the 257. The state of the Select input determines the particular register from which the data comes. CD74HC257 can also be used as a function generator.




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