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CDCU877A PDF预览

CDCU877A

更新时间: 2024-11-05 22:28:51
品牌 Logo 应用领域
德州仪器 - TI 时钟驱动器
页数 文件大小 规格书
17页 408K
描述
1.8V PHASE LOCK LOOP CLOCK DRIVER

CDCU877A 数据手册

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ꢇ ꢈꢃ ꢉꢊ ꢋꢌ ꢆꢍꢎ ꢏ ꢐ ꢀꢑ ꢏ ꢐꢐ ꢋ ꢀꢏ ꢐ ꢀꢑ ꢁ ꢒꢓ ꢊ ꢎꢒ  
SCAS688A − JUNE 2003 − REVISED JANUARY 2004  
D
1.8-V Phase Lock Loop Clock Driver for  
Double Data Rate (DDR II) Applications  
D
External Feedback Pins (FBIN, FBIN) are  
Used to Synchronize the Outputs to the  
Input Clocks  
D
D
D
D
D
D
D
D
D
Spread Spectrum Clock Compatible  
Operating Frequency: 10 MHz to 400 MHz  
Low Current Consumption: <135 mA  
Low Jitter (Cycle-Cycle): 30 ps  
Low Output Skew: 35 ps  
D
D
D
Single-Ended Input and Single-Ended  
Output Modes  
Meets or Exceeds JESD82-8 PLL Standard  
for PC2-3200/4300  
Fail-Safe Inputs  
Low Period Jitter: 20 ps  
Low Dynamic Phase Offset:: 15 ps  
Low Static Phase Offset:: 50 ps  
Distributes One Differential Clock Input to  
Ten Differential Outputs  
D
52-Ball µBGA (MicroStar JuniorBGA,  
0,65-mm pitch) and 40-Pin MLF  
description  
The CDCU877 is a high-performance, low-jitter, low-skew, zero-delay buffer that distributes a differential clock input  
pair (CK, CK) to ten differential pairs of clock outputs (Yn, Yn) and to one differential pair of feedback clock outputs  
(FBOUT, FBOUT). The clock outputs are controlled by the input clocks (CK, CK), the feedback clocks (FBIN, FBIN),  
the LVCMOS control pins (OE, OS), and the analog power input (AV ). When OE is low, the clock outputs, except  
DD  
FBOUT/FBOUT, are disabled while the internal PLL continues to maintain its locked-in frequency. OS (output select)  
is a program pin that must be tied to GND or V . When OS is high, OE functions as previously described. When  
DD  
OS and OE are both low, OE has no affect on Y7/Y7, they are free running. When AV  
off and bypassed for test purposes.  
is grounded, the PLL is turned  
DD  
When both clock inputs (CK, CK) are logic low, the device enters in a low power mode. An input logic detection circuit  
on the differential inputs, independent from input buffers, detects the logic low level and performs in a low power state  
where all outputs, the feedback, and the PLL are off. When the clock inputs transition from being logic low to being  
differential signals, the PLL turns back on, the inputs and the outputs are enabled, and the PLL obtains phase lock  
between the feedback clock pair (FBIN, FBIN) and the clock input pair (CK, CK) within the specified stabilization time.  
The CDCU877 is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from –40°C  
to 85°C.  
AVAILABLE OPTIONS  
T
A
52-Ball BGA  
40-Pin MLF  
CDCU877ZQL  
(Pb-Free)  
−40°C to 85°C  
−40°C to 85°C  
CDCU877RTB  
CDCU877AZQL  
(Pb-Free)  
CDCU877ARTB  
−40°C to 85°C  
−40°C to 85°C  
CDCU877GQL  
CDCU877AGQL  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
MicroStar Junior is a trademark of Texas Instruments.  
ꢕꢢ  
Copyright 2004, Texas Instruments Incorporated  
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ꢝꢛ  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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