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CDCVF2510APWR Scheda tecnica(PDF) 1 Page - Texas Instruments

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Il numero della parte CDCVF2510APWR
Spiegazioni elettronici  3.3-V PHASE-LOCK LOOP CLOCK DRIVER WITH POWER DOWN MODE
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

CDCVF2510APWR Scheda tecnica(HTML) 1 Page - Texas Instruments

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1
FEATURES
APPLICATIONS
CLK
AVCC
VCC
1Y9
1Y8
GND
GND
1Y7
1Y6
1Y5
VCC
FBIN
1
2
3
4
5
6
7
8
9
10
11
12
AGND
VCC
1Y0
1Y1
1Y2
GND
GND
1Y3
1Y4
VCC
G
FBOUT
24
23
22
21
20
19
18
17
16
15
14
13
PW PACKAGE
(TOP VIEW)
DESCRIPTION
CDCVF2510A
www.ti.com ............................................................................................................................................... SCAS764C – MARCH 2004 – REVISED FEBRUARY 2009
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
WITH POWER DOWN MODE
• DRAM Applications
• Designed to Meet and Exceed PC133
SDRAM Registered DIMM Specification
• PLL Based Clock Distributors
Rev. 1.1
• Non-PLL Clock Buffer
• Spread Spectrum Clock Compatible
• Operating Frequency 20 MHz to 175 MHz
• Static Phase Error Distribution at 66 MHz to
166 MHz is ±125 ps
• Jitter (cyc–cyc) at 66 MHz to 166 MHz is
|70| ps
• Advanced Deep Submicron Process Results in
More Than 40% Lower Power
Consumption vs Current Generation
PC133 Devices
• Auto Frequency Detection to Disable
Device (Power-Down Mode)
• Available in Plastic 24-Pin TSSOP
• Distributes One Clock Input to One Bank of
10 Outputs
• External Feedback (FBIN) Terminal is
Used to Synchronize the Outputs to the Clock
Input
• 25-Ω On-Chip Series Damping Resistors
• No External RC Network Required
• Operates at 3.3 V
The CDCVF2510A is a high-performance, low-skew, low-jitter, phase-lock loop (PLL) clock driver. The
CDCVF2510A uses a phase-lock loop (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
CDCVF2510A operates at a 3.3-V VCC and also provides integrated series-damping resistors that make it ideal
for driving point-to-point loads.
One bank of 10 outputs provides 10 low-skew, low-jitter copies of CLK. Output signal duty cycles are adjusted to
50%, independent of the duty cycle at CLK. Outputs are enabled or disabled via the control (G) 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. The device automically goes into power-down mode when no input signal
(< 1 MHz) is applied to CLK; the outputs go into a low state.
Unlike many products containing PLLs, the CDCVF2510A 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 CDCVF2510A 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, a fixed-phase signal at CLK, or following any changes to the PLL reference or feedback signals.
The PLL can be bypassed by strapping AVCC to ground to use as a simple clock buffer.
1
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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