IDT8T49N366I Datasheet, PDF (23/36 Pages) Integrated Device Technology – Fourth generation FemtoClock

IDT8T49N366I Data Sheet
FEMTOCLOCK^® NG TRIPLE UNIVERSAL FREQUENCY TRANSLATOR^TM
Differential Clock Input Interface
The CLKx / nCLKx accepts LVDS, LVPECL, LVHSTL, HCSL and
other differential signals. Both V_SWING and V_OH must meet the V_PP
and V_CMR input requirements. Figures 5A to 5E show interface
examples for the CLKx / nCLKx input driven by the most common
driver types. The input interfaces suggested here are examples only.
Please consult with the vendor of the driver component to confirm the
driver termination requirements. For example, in Figure 5A, the input
termination applies for IDT open emitter LVHSTL drivers. If you are
using an LVHSTL driver from another vendor, use their termination
recommendation.
1.8V
Zo = 50
Zo = 50
LVHSTL
IDT Open Emitter
LVHSTL Driver
2.5V
CLK
R1
R2
50
50
nCLK
Differential
Input
Figure 5A. CLKx/ nCLKx Input Driven by an
IDT Open Emitter LVHSTL Driver
2.5V
LVPECL
Zo = 50
Zo = 50
2.5V
CLK
R1
R2
50
50
nCLK
Differential
Input
R3
18
Figure 5B. CLKx/ nCLKx Input
Driven by a 2.5V LVPECL Driver
2.5V
LVPECL
Zo = 50
Zo = 50
2.5V
R3
250
R4
250
2.5V
CLK
R1
62.5
R2
62.5
nCLK
Differential
Input
2.5V
LVDS
Zo = 50
Zo = 50
2.5V
R1
100
CLK
nCLK
Differential
Input
Figure 5C. CLKx/ nCLKx Input
Driven by a 2.5V LVPECL Driver
Figure 5D. CLKx/ nCLKx Input
Driven by a 2.5V LVDS Driver
2.5V
2.5V
*R3 33
Zo = 50
Zo = 50
*R4 33
HCSL
R1
50
*Optional – R3 and R4 can be 0
CLK
nCLK
R2
50
Differential
Input
Figure 5E. CLKx/ nCLKx Input
Driven by a 2.5V HCSL Driver
IDT8T49N366AASGI REVISION A JUNE 28, 2013
23
©2013 Integrated Device Technology, Inc.