ics8516 Integrated Device Technology, ics8516 Datasheet - Page 9

• Manufacturer Part Number: ics8516
• Description: Differential-input Lvds-output 1 16 700-mhz Clock Buffer
• Manufacturer: Integrated Device Technology

IDT™ / ICS™ LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP
ICS8516
LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP
W
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
R
I
LVCMOS C
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.
8516FY
NPUTS
ECOMMENDATIONS FOR
IRING THE
:
ONTROL
D
Integrated
Circuit
Systems, Inc.
IFFERENTIAL
P
INS
:
U
NUSED
I
F
NPUT TO
IGURE
I
NPUT AND
1. S
Single Ended Clock Input
A
A
www.icst.com/products/hiperclocks.html
PPLICATION
CCEPT
INGLE
O
E
S
NDED
UTPUT
C1
0.1u
INGLE
D
V_REF
DD
/2 is
IFFERENTIAL
S
IGNAL
P
E
INS
9
9
I
NDED
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
and R2/R1 = 0.609.
NFORMATION
O
LVDS – Like O
All unused LVDS output pairs can be either left floating or
terminated with 100Ω across. If they are left floating, we
recommend that there is no trace attached.
1K
D
R1
1K
R2
UTPUTS
RIVING
VDD
L
EVELS
nCLKx
CLKx
-
TO
D
:
IFFERENTIAL
-LVDS C
UTPUT
I
NPUT
LOCK
DD
= 3.3V, V_REF should be 1.25V
L
OW
D
ISTRIBUTION
S
KEW
REV. B FEBRUARY 21, 2006
, 1-
TO
C
-16
HIP
ICS8516
TSD