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CDCVF2509PWR データシート(PDF) 1 Page - Texas Instruments

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部品番号 CDCVF2509PWR
部品情報  3.3-V PHASE-LOCK LOOP CLOCK DRIVER
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

CDCVF2509PWR データシート(HTML) 1 Page - Texas Instruments

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CDCVF2509
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS637 – DECEMBER 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Designed to Meet and Exceed PC133
SDRAM Registered DIMM Specification
Rev. 1.1
D Spread Spectrum Clock Compatible
D Operating Frequency 50 MHz to 175 MHz
D Static Phase Error Distribution at 66MHz to
166 MHz is
±125 ps
D Jitter (cyc – cyc) at 66 MHz to 166 MHz is
|70| ps
D Advanced Deep Sub-Micron Process
Results in More Than 40% Lower Power
Consumption Versus Current Generation
PC133 Devices
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 25-Ω On-Chip Series Damping Resistors
D No External RC Network Required
D Operates at 3.3 V
description
The CDCVF2509 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 CDCVF2509 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 CDCVF2509 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 CDCVF2509 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 CDCVF2509 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
© 1999, 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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