There is a case of TSSOP in which it is packaged. Tape & Reel is the form in which it is packaged. A 48 pin is used for operation. It consumes 200nA quiescent current and is unaffected by external factors.
74ALVCH16244DGG,518 Features
74ALVCH16244DGG,518 Applications
There are a lot of NXP Semiconductors / Freescale 74ALVCH16244DGG,518 Clock Buffers & Drivers applications.