CD74HC157E .

产品概述

The CD74HC157E is a 2-input high speed CMOS Quad Multiplexer which select four bits of data from two sources under the control of a common Select input (S). The Enable input (E) is active low. When (E) is high, all of the outputs in the 158, the inverting type, (1Y-4Y) are forced high and in the 157, the non-inverting type, all of the outputs (1Y-4Y) are forced low, regardless of all other input conditions. Moving data from two groups of registers to four common output busses is a common use of these devices. The state of the Select input determines the particular register from which the data comes. They can also be used as function generators.

• Common select inputs
• Separate enable inputs
• Buffered inputs and outputs
• Balanced propagation delay and transition times
• Significant power reduction compared to LSTTL logic ICs
• high noise immunity
• Direct LSTTL input logic compatibility
• CMOS Input compatibility
• 10 LSTTL Loads standard outputs
• 15 LSTTL Loads bus driver outputs

应用

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