参数资料
型号: ICS85408BGT
元件分类: 时钟及定时
英文描述: 85408 SERIES, LOW SKEW CLOCK DRIVER, 8 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO24
封装: 4.40 X 7.80 MM, 0.92 MM HEIGHT, MS-153, TSSOP-24
文件页数: 10/12页
文件大小: 461K
代理商: ICS85408BGT
85408BG
www.icst.com/products/hiperclocks.html
REV. A APRIL 25, 2005
7
Integrated
Circuit
Systems, Inc.
ICS85408
LOW SKEW, 1-TO-8
DIFFERENTIAL-TO-LVDS CLOCK DISTRIBUTION CHIP
APPLICATION INFORMATION
Figure 1 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V
DD/2 is
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
FIGURE 1. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
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
DD = 3.3V, V_REF should be 1.25V
and R2/R1 = 0.609.
V_REF
R1
1K
C1
0.1u
R2
1K
Single Ended Clock Input
CLK
nCLK
VDD
LVDS DRIVER TERMINATION
A general LVDS interface is shown in
Figure 2. In a 100
Ω differ-
ential transmission line environment, LVDS drivers require a
matched load termination of 100
Ω across near the receiver in-
put. For a multiple LVDS outputs buffer, if only partial outputs
are used, it is recommended to terminate the un-used outputs.
FIGURE 2. TYPICAL LVDS DRIVER TERMINATION
3.3V
LVDS_DRIVER
R1
100
HiPerClockS
Zo = 50 Ohm
nCLK
CLK
相关PDF资料
PDF描述
ICS85408BGLF 85408 SERIES, LOW SKEW CLOCK DRIVER, 8 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO24
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