Download the 4052 datasheet PDF.
This datasheet also includes the 4051 variant, as both parts are published together in a single manufacturer document.
4051 : 8X1 multiplexer/demultiplexer Pin Symbol
E
VEE VSS S1 , S2 , S3 Y0 – Y7 Z VDD Pin Function
Kept low to enable normal functioning of MUX/DEMUX Supply Voltage Ground Supply Voltage
Selection.