參數(shù)資料
型號: MPC9331AC
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 2/13頁
文件大小: 0K
描述: IC PLL CLOCK GEN 1:6 32-LQFP
標準包裝: 250
類型: PLL 時鐘發(fā)生器
PLL: 帶旁路
輸入: LVCMOS,LVPECL
輸出: LVCMOS
電路數(shù): 1
比率 - 輸入:輸出: 2:6
差分 - 輸入:輸出: 是/無
頻率 - 最大: 240MHz
除法器/乘法器: 是/是
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 32-LQFP
供應商設(shè)備封裝: 32-TQFP(7x7)
包裝: 托盤
MPC9331 REVISION 7 JANUARY 31, 2013
10
2012 Integrated Device Technology, Inc.
MPC9331 Data Sheet
3.3 V 1:6 LVCMOS PLL CLOCK GENERATOR
the line impedances. The voltage wave launched down the
two lines will equal:
VL =VS (Z0 (RS+R0 + Z0))
Z0 =50 || 50
RS =36 || 36
R0 =14
VL = 3.0 (25 (18+14+25)
= 1.31 V
At the load end, the voltage will double due to the near
unity reflection coefficient, to 2.6 V. It will then increment
towards the quiescent 3.0 V in steps separated by one round
trip delay (in this case 4.0 ns).
Final skew data pending specification.
Figure 5. Single versus Dual Line
Termination Waveforms
Since this step is well above the threshold region it will not
cause any false clock triggering; however, designers may be
uncomfortable with unwanted reflections on the line. To better
match the impedances when driving multiple lines, the
situation in should be used. In this case the series terminating
resistors are reduced such that when the parallel combination
is added to the output buffer impedance, the line impedance
is perfectly matched.
Figure 6. Optimized Dual Line Termination
Figure 7. CCLK MPC9331 AC Test Reference for Vcc = 3.3 V
Time (ns)
Volt
age
(V
)
3.0
2.5
2.0
1.5
1.0
0.5
0
2
4
6
8
10
12
14
OutB
tD = 3.9386
OutA
tD = 3.8956
In
14
+ 22 || 22 = 50|| 50
25
= 25
14
MPC9331
Output
Buffer
RS = 22
ZO = 50
RS = 22
ZO = 50
Pulse
Generator
Z = 50
RT = 50
ZO = 50
RT = 50
ZO = 50
MPC9931 DUT
VTT
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