参数资料
型号: MPC93H51AC
厂商: IDT, Integrated Device Technology Inc
文件页数: 11/14页
文件大小: 0K
描述: IC PLL CLK DRIVER LV 32-LQFP
标准包装: 250
类型: PLL 时钟发生器
PLL: 带旁路
输入: LVCMOS,LVPECL
输出: LVCMOS
电路数: 1
比率 - 输入:输出: 2:11
差分 - 输入:输出: 是/无
频率 - 最大: 240MHz
除法器/乘法器: 是/无
电源电压: 3.135 V ~ 3.465 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 32-LQFP
供应商设备封装: 32-TQFP(7x7)
包装: 托盘
MPC93H51 REVISION 4 FEBRUARY 15, 2013
6
2013 Integrated Device Technology, Inc.
MPC93H51 Data Sheet
LOW VOLTAGE PLL CLOCK DRIVER
APPLICATIONS INFORMATION
Programming the MPC93H51
The MPC93H51 clock driver outputs can be configured
into several divider modes. In addition, the external feedback
of the device allows for flexibility in establishing various input-
to-output frequency relationships. The output divider of the
four output groups allows the user to configure the outputs
into 1:1, 2:1, 4:1 and 4:2:1 frequency ratios. The use of even
dividers ensure that the output duty cycle is always 50%.
Table 7 illustrates the various output configurations. The
table describes the outputs using the input clock frequency
CLK as a reference.
The output division settings establish the output
relationship. In addition, it must be ensured that the VCO will
be stable given the frequency of the outputs desired. The
feedback frequency should be used to situate the VCO into a
frequency range in which the PLL will be stable. The design
of the PLL supports output frequencies from 25 MHz to
240 MHz while the VCO frequency range is specified from
200 MHz to 480 MHz and should not be exceeded for stable
operation.
Using the MPC93H51 in Zero-Delay Applications
Nested clock trees are typical applications for the
MPC93H51. For these applications the MPC93H51 offers a
differential LVPECL clock input pair as a PLL reference. This
allows for the use of differential LVPECL primary clock
distribution devices such as the Freescale Semiconductor
MC100EP111 or MC10EP222, taking advantage of its
superior low-skew performance. Clock trees using LVPECL
for clock distribution and the MPC93H51 as LVCMOS PLL
fanout buffer with zero insertion delay will show significantly
lower clock skew than clock distributions developed from
CMOS fanout buffers.
The external feedback option of the MPC93H51 PLL
allows for its use as a zero delay buffer. The PLL aligns the
feedback clock output edge with the clock input reference
edge and virtually eliminates the propagation delay through
the device.
The remaining insertion delay (skew error) of the
MPC93H51 in zero-delay applications is measured between
the reference clock input and any output. This effective delay
consists of the static phase offset (SPO or t()), I/O jitter
(tJIT(), phase or long-term jitter), feedback path delay and
the output-to-output skew (tSK(O) relative to the feedback
output.
Table 7. Output Frequency Relationship(1) for an Example Configuration
1. Output frequency relationship with respect to input reference frequency CLK. QC1 is connected to EXT_FB.
Inputs
Outputs
FSELA
FSELB
FSELC
FSELD
QA
QB
QC
QD
0
2 * CLK
CLK
0
1
2 * CLK
CLK
2
0
1
0
4 * CLK
2 * CLK
CLK
2* CLK
0
1
4 * CLK
2 * CLK
CLK
0
1
0
2 * CLK
CLK
2
CLK
0
1
0
1
2 * CLK
CLK
2
CLK
2
0
1
0
4 * CLK
CLK
2 * CLK
0
1
4 * CLK
CLK
1
0
CLK
1
0
1
CLK
2
1
0
1
0
2 * CLK
CLK
2 * CLK
1
0
1
2 * CLK
CLK
1
0
CLK
2
CLK
1
0
1
CLK
2
CLK
2
1
0
2 * CLK
CLK
2 * CLK
1
2 * CLK
CLK
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