ICS844256 Datasheet, PDF (11/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844256
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
RELIABILITY INFORMATION
TABLE 7A. θ_JAVS. AIR FLOW TABLE FOR 24 LEAD SOIC
θ_JA by Velocity (Linear Feet per Minute)
Multi-Layer PCB, JEDEC Standard Test Boards
0
50°C/W
200
43°C/W
500
38°C/W
NOTE: Most modern PCB designs use multi-layered boards.The data in the second row pertains to most designs.
TABLE 7B. θ_JAVS. AIR FLOW TABLE FOR 24 LEAD TSSOP
θ_JA by Velocity (Meters per Second)
Multi-Layer PCB, JEDEC Standard Test Boards
0
70°C/W
1
65°C/W
2.5
62°C/W
TRANSISTOR COUNT
The transistor count for ICS844256 is: 3887
844256AM
www.icst.com/products/hiperclocks.html
11
REV. A NOVEMBER 29, 2005