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CDC2510B_15 PDF预览

CDC2510B_15

更新时间: 2024-11-06 02:58:47
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德州仪器 - TI /
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10页 148K
描述
3.3V Phase-Lock Loop Clock Driver

CDC2510B_15 数据手册

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CDC2510B  
3.3-V PHASE-LOCK LOOP CLOCK DRIVER  
SCAS612 – SEPTEMBER 1998  
PW PACKAGE  
(TOP VIEW)  
Designed to Meet PC SDRAM Registered  
DIMM Specification  
Spread Spectrum Clock Compatible  
AGND  
CLK  
AV  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
Operating Frequency 25 MHz to 125 MHz  
V
2
CC  
CC  
tPhase Error Minus Jitter at 66MHz to  
100MHz is ±150ps  
1Y0  
1Y1  
1Y2  
GND  
GND  
1Y3  
V
3
CC  
1Y9  
1Y8  
GND  
GND  
1Y7  
1Y6  
4
5
Jitter (pk – pk) at 66 MHz to 100 MHz is  
±80ps  
6
7
Jitter (cyc – cyc) at 66 MHz to 100 MHz is  
|100 ps|  
8
1Y4  
9
Available in Plastic 24-Pin TSSOP  
V
10  
11  
12  
15 1Y5  
CC  
G
Phase-Lock Loop Clock Distribution for  
Synchronous DRAM Applications  
V
14  
13  
CC  
FBOUT  
FBIN  
Distributes One Clock Input to One Bank of  
Ten Outputs  
Separate Output Enable for Each Output  
Bank  
External Feedback (FBIN) Terminal Is Used  
to Synchronize the Outputs to the Clock  
Input  
On-Chip Series Damping Resistors  
No External RC Network Required  
Operates at 3.3-V  
description  
The CDC2510B is a high-performance, low-skew, low-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 CDC2510B operates at 3.3-V V . It also  
CC  
provides integrated series-damping resistors that make it ideal for driving point-to-point loads.  
One bank of ten outputs provides ten low-skew, low-jitter copies of CLK. Output signal duty cycles are adjusted  
to 50 percent, independent of the duty cycle at CLK. All outputs can be enabled or disabled via a single output  
enable input. When the G input is high, the outputs switch in phase and frequency with CLK; when the G input  
is low, the outputs are disabled to the logic-low state.  
Unlike many products containing PLLs, the CDC2510B does not require external RC networks. The loop filter  
for the PLL is included on-chip, minimizing component count, board space, and cost.  
Because it is based on PLL circuitry, the CDC2510B 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 CDC2510B is characterized for operation from 0°C to 70°C.  
For application information refer to application reports High Speed Distribution Design Techniques for  
CDC509/516/2509/2510/2516 (literature number SLMA003) and Using CDC2509A/2510A PLL with Spread  
Spectrum Clocking (SSC) (literature number SCAA039).  
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.  
Copyright 1998, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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