The ?HC4351, CD74HCT4351
are digitally controlled analog Switches
which utilize silicon-gateCMOS technology to achieve operating speeds similar to LSTTL with the low power consumption of standard CMOS integrated Circuits
These Analog Multiplexers
demultiplexers are, in essence, the HC/HCT4015 and HC4052 preceded by address Latches
that are controlled by an active low Latch Enable input (LE). Two Enable inputs, one active low (E1), and the other active high (E2) are provided allowing enabling with either input voltage level.