See datasheet for actual packaging/pinout drawings

Package | PIN:

N | 16

Temp:

M (-55 to 125)

ECO Plan:

Pb-Free (RoHS)

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CD74HCT257E-High Speed CMOS Logic Quad 2-Input Multiplexers with Non-Inverting 3-State Outputs

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.

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