A 8-SOIC (0.154, 3.90mm Width) case is used for packaging. A Tape & Reel (TR) is used to package it. As a rule, the maximum value for normal operation is 200MHz. As far as I can tell, it is mounted by Surface Mount. The electrical component has a classification of Fanout Buffer (Distribution). Setting the temperature to -40°C~85°C will ensure reliable performance. Ideally, it should be able to operate from 1.14V~1.89V volts. There is a value of LVCMOS as the output. This is a member of the family of ICS621.
ICS621MIT Features
The operating temperature of -40°C~85°C degrees
ICS621MIT Applications
There are a lot of Renesas Electronics America Inc. ICS621MIT Clock Buffers & Drivers applications.