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CDC2509A_15 PDF预览

CDC2509A_15

更新时间： 2024-09-14 02:58:43
品牌 Logo 应用领域
德州仪器 - TI 驱动
页数 文件大小 规格书
13页 431K
描述
3.3-V PHASE-LOCK LOOP CLOCK DRIVER

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CDC2509A_15 数据手册

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SCAS603C − APRIL 1998 − REVISED DECEMBER 2004  
PW PACKAGE  
(TOP VIEW)  
D
Use CDCVF2509A as a Replacement for  
this Device  
D
D
D
D
D
D
D
Spread Spectrum Clock Compatible  
100-MHz Maximum Frequency  
AGND  
CLK  
AV  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
V
2
CC  
CC  
Available in Plastic 24-Pin TSSOP  
1Y0  
1Y1  
1Y2  
GND  
GND  
1Y3  
V
3
CC  
2Y0  
2Y1  
GND  
GND  
2Y2  
2Y3  
4
Phase-Lock Loop Clock Distribution for  
Synchronous DRAM Applications  
5
6
Distributes One Clock Input to One Bank of  
Five and One Bank of Four Outputs  
7
8
Separate Output Enable for Each Output  
Bank  
1Y4  
9
V
10  
11  
12  
V
CC  
CC  
External Feedback (FBIN) Pin Is Used to  
Synchronize the Outputs to the Clock Input  
1G  
FBOUT  
2G  
FBIN  
D
D
D
On-Chip Series Damping Resistors  
No External RC Network Required  
Operates at 3.3-V V  
CC  
description  
The CDC2509A is a high-performance, lowkew, lo-jitter, phase-lock loop (PLL) clock driver. It uses a PLL  
to precisely align, in both frequency and phase, the feedback (FBOUT) output to the clock (CLK) input signal.  
It is specifically designed for use with synchronous DRAMs. The CDC2509A operates at 3.3-V V  
integrated series-damping resistors hat mait ideal for driving point-to-point loads.  
and provides  
CC  
One bank of five outputs and one bank of four outputs provide nine low-skew, low-jitter copies of CLK. Output  
signal duty cycles are adjustto 50 percent, independent of the duty cycle at CLK. Each bank of outputs can  
be enabled or disabled separately via the control (1G and 2G) inputs. When the G inputs are high, the outputs  
switch in phase and frequency with CLK; when the G inputs are low, the outputs are disabled to the logic-low  
state.  
Unlike many products containing PLLs, the CDC2509A does not require external RC networks. The loop filter  
for the PLL is luded on-chip, minimizing component count, board space, and cost.  
Because it is based on PLL circuitry, the CDC2509A requires a stabilization time to achieve phase lock of the  
feedback signal to the reference signal. This stabilization time is required, following power up and application  
of a fixed-frequency, fixed-phase signal at CLK, and following any changes to the PLL reference or feedback  
signals. The PLL can be bypassed for test purposes by strapping AV  
to ground.  
CC  
The CDC2509A is characterized for operation from 0°C to 70°C.  
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.  
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Copyright 2001 − 2004, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...13

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