CD74HC257 - High Speed CMOS Logic Quad 2-Input Multiplexers with Non-Inverting 3-State Outputs

Updated : 2020-01-09 14:43:59
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. It can also be used as a function generator.

Products containing the "CD74HC257" keyword are: CD74HC257E , CD74HC257E , CD74HC257EE4 , CD74HC257EH , CD74HC257EX , CD74HC257M , CD74HC257M , CD74HC257M96 , CD74HC257M96 , CD74HC257M96 SOP3.9 , CD74HC257M96E4 , CD74HC257ME4 , CD74HC257MT , CD74HC257MT , CD74HC257MTE4
Features

  • Buffered Inputs
  • Typical Propagation Delay (In to Output) = 12ns at VCC = 5V, CL = 15pF, TA = 25°C
  • Fanout (Over Temperature Range)
    • Standard Outputs...10 LSTTL Loads
    • Bus Driver Outputs...15 LSTTL Loads
  • Wide Operating Temperature Range...–55°C to 125°C
  • 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 1µA at VOL, VOH

Data sheet acquired from Harris Semiconductor