85354AKLF IDT, Integrated Device Technology Inc, 85354AKLF Datasheet - Page 7

• Manufacturer Part Number: 85354AKLF
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 85354AKLF

• Function: Clock Multiplexer
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Package Type: VFQFN
• Pin Count: 16
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Application Information
Wiring the Differential Input to Accept Single Ended Levels
Figure 1 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V
generated by the bias resistors R1, R2 and C1. This bias circuit
should be located as close as possible to the input pin. The ratio of
R1 and R2 might need to be adjusted to position the V_REF in the
center of the input voltage swing. For example, if the input clock
swing is only 2.5V and V
R2/R1 = 0.609.
Recommendations for Unused Input and Output Pins
Inputs:
LVCMOS Control Pins
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1kΩ resistor can be used.
CLK/CLK I
For applications not requiring the use of the differential input, both
CLK and CLK can be left floating. Though not required, but for
additional protection, a 1kΩ resistor can be tied from CLK to
ground.
IDT™ / ICS™ LVPECL/ECL MULTIPLEXER
ICS85354
DUAL 2:1 AND 1:2, DIFFERENTIAL-TO-LVPECL/ECL MULTIPLEXER
NPUTS
CC
= 3.3V, V_REF should be 1.25V and
CC
/2 is
7
Figure 1. Single-Ended Signal Driving Differential Input
Outputs:
LVPECL Outputs
All unused LVPECL outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
Single Ended Clock Input
C1
0.1u
V_REF
ICS85354AK REV. C NOVEMBER 04, 2008
R1
1K
R2
1K
V
CC
CLKx
nCLKx