
ICS87946AYI REVISION B JUNE 22, 2012
7
2012 Integrated Device Technology, Inc.
ICS87946I Data Sheet
LOW SKEW, ÷1, ÷2 LVCMOS/LVTTL CLOCK GENERATOR
Application Information
Recommendations for Unused Input and Output Pins
Inputs:
CLK Inputs
For applications not requiring the use of a clock input, it can be left
floating. Though not required, but for additional protection, a 1k
resistor can be tied from the CLK input to ground.
LVCMOS Control Inputs
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional protection.
A 1k
resistor can be used.
Outputs:
LVCMOS Outputs
All unused LVCMOS output can be left floating. There should be no
trace attached.
Reliability Information
Table 6. θJA vs. Air Flow Table
Transistor Count
The transistor count for ICS87946I is: 1204
θ
JA vs. Air Flow (Linear Feet per Minute)
Linear Feet per Minute
0200
500
Single-Layer PCB, JEDEC Standard Test Boards
67.8°C/W
55.9°C/W
50.1°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
47.9°C/W
42.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.