参数资料
型号: MPC8535EBVTANGA
厂商: Freescale Semiconductor
文件页数: 123/126页
文件大小: 0K
描述: MPU POWERQUICC III 783FCPBGA
标准包装: 1
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 800MHz
电压: 1V
安装类型: 表面贴装
封装/外壳: 783-BBGA,FCBGA
供应商设备封装: 783-FCPBGA(29x29)
包装: 托盘
MPC8535E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5
Electrical Characteristics
Freescale Semiconductor
96
This figure shows the SerDes reference clock connection reference circuits for LVPECL type clock driver. Since LVPECL
driver’s DC levels (both common mode voltages and output swing) are incompatible with chip’s SerDes reference clock input’s
DC requirement, AC-coupling has to be used. This figure assumes that the LVPECL clock driver’s output impedance is 50
Ω.
R1 is used to DC-bias the LVPECL outputs prior to AC-coupling. Its value could be ranged from 140
Ω to 240Ω depending on
clock driver vendor’s requirement. R2 is used together with the SerDes reference clock receiver’s 50-
Ω termination resistor to
attenuate the LVPECL output’s differential peak level such that it meets the chip’s SerDes reference clock’s differential input
amplitude requirement (between 200mV and 800mV differential peak). For example, if the LVPECL output’s differential peak
is 900mV and the desired SerDes reference clock input amplitude is selected as 600mV, the attenuation factor is 0.67, which
requires R2 = 25
Ω. Please consult clock driver chip manufacturer to verify whether this connection scheme is compatible with
a particular clock driver chip.
Figure 64. AC-Coupled Differential Connection with LVPECL Clock Driver (Reference Only)
This figure shows the SerDes reference clock connection reference circuits for a single-ended clock driver. It assumes the DC
levels of the clock driver are compatible with chip’s SerDes reference clock input’s DC requirement.
Figure 65. Single-Ended Connection (Reference Only)
50
Ω
50
Ω
SDn_REF_CLK
Clock Driver
100
Ω differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
LVPECL CLK
Driver Chip
R2
R1
10nF
10 nF
50
Ω
50
Ω
SDn_REF_CLK
100
Ω differential PWB trace
SerDes Refer.
CLK Receiver
Clock Driver
CLK_Out
Single-Ended
CLK Driver Chip
33
Ω
Total 50
Ω. Assume clock driver’s
output impedance is about 16
Ω.
50
Ω
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