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CDC2509CPWG4 Scheda tecnica(PDF) 1 Page - Texas Instruments

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Il numero della parte CDC2509CPWG4
Spiegazioni elettronici  3.3V PHASE-LOCK LOOP CLOCK DRIVER
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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CDC2509CPWG4 Scheda tecnica(HTML) 1 Page - Texas Instruments

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CDC2509C
3.3V PHASELOCK LOOP CLOCK DRIVER
SCAS620A − DECEMBER 1998 − REVISED DECEMBER 2004
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Use CDCVF2509A as a Replacement for
this Device
D Designed to Meet PC SDRAM Registered
DIMM Design Support Document Rev. 1.2
D Spread Spectrum Clock Compatible
D Operating Frequency 25 MHz to 125 MHz
D Static tPhase Error Distribution at 66MHz to
100 MHz is
±150 ps
D Drop-In Replacement for TI CDC2509A With
Enhanced Performance
D Jitter (cyc − cyc) at 66 MHz to 100 MHz is
|100 ps|
D Available in Plastic 24-Pin TSSOP
D Phase-Lock Loop Clock Distribution for
Synchronous DRAM Applications
D Distributes One Clock Input to One Bank of
Five and One Bank of Four Outputs
D Separate Output Enable for Each Output
Bank
D External Feedback (FBIN) Terminal Is Used
to Synchronize the Outputs to the Clock
Input
D On-Chip Series Damping Resistors
D No External RC Network Required
D Operates at 3.3 V
description
The CDC2509C 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 CDC2509C operates at 3.3 V VCC. It also
provides integrated series-damping resistors that make it ideal for driving point-to-point loads.
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 adjusted to 50%, independent of the duty cycle at CLK. Each bank of outputs is 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 CDC2509C 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 CDC2509C 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 AVCC to ground.
The CDC2509C is characterized for operation from 0
°C to 85°C.
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.
Copyright
 1998 − 2004, Texas Instruments Incorporated
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.
CLK
AVCC
VCC
2Y0
2Y1
GND
GND
2Y2
2Y3
VCC
2G
FBIN
1
2
3
4
5
6
7
8
9
10
11
12
AGND
VCC
1Y0
1Y1
1Y2
GND
GND
1Y3
1Y4
VCC
1G
FBOUT
24
23
22
21
20
19
18
17
16
15
14
13
PW PACKAGE
(TOP VIEW)


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