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CDCVF25081 データシート(PDF) 1 Page - Texas Instruments

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部品番号 CDCVF25081
部品情報  3.3-V PHASED-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

CDCVF25081 データシート(HTML) 1 Page - Texas Instruments

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CDCVF25081
3.3-V PHASED-LOCK LOOP CLOCK DRIVER
SCAS671A – OCTOBER 2001 – REVISED FEBRUARY 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Phase-Locked Loop-Based Zero-Delay
Buffer
D Operating Frequency: 8 MHz to 200 MHz
D Low Jitter (Cycle-Cycle): ±100 ps Over the
Range 66 MHz to 200 MHz
D Distributes One Clock Input to Two Banks
of Four Outputs
D Auto Frequency Detection to Disable
Device (Power Down Mode)
D Consumes Less Than 20 µA in Power Down
Mode
D Operates From Single 3.3-V Supply
D Industrial Temperature Range –40°C to
85
°C
D 25-Ω On-Chip Series Damping Resistors
D No External RC Network Required
D Spread Spectrum Clock Compatible (SSC)
D Available in 16-Pin TSSOP or 16-Pin SOIC
Packages
description
The CDCVF25081 is a high-performance, low-skew, low-jitter, phase-lock loop clock driver. It uses a PLL to
precisely align, in both frequency and phase, the output clocks to the input clock signal. The CDCVF25081
operates from a nominal supply voltage of 3.3 V. The device also includes integrated series-damping resistors
in the output drivers that make it ideal for driving point-to-point loads.
Two banks of four outputs each provide low-skew, low-jitter copies of CLKIN. All outputs operate at the same
frequency. Output duty cycles are adjusted to 50%, independent of duty cycle at CLKIN. The device
automatically goes into power-down mode when no input signal is applied to CLKIN and the outputs go into a
low state. Unlike many products containing PLLs, the CDCVF25081 does not require an external RC network.
The loop filter for the PLL is included on-chip, minimizing component count, space, and cost.
Because it is based on a PLL circuitry, the CDCVF25081 requires a stabilization time to achieve phase lock of
the feedback signal to the reference signal. This stabilization is required following power up and application of
a fixed-frequency signal at CLKIN and any following changes to the PLL reference.
The CDCVF25081 is characterized for operation from -40
°C to 85°C.
FUNCTION TABLE
S2
S1
1Y0–1Y3
2Y0–2Y3
OUTPUT SOURCE
PLL SHUTDOWN
0
0
Hi-Z
Hi-Z
N/A.
Yes
0
1
Active
Hi-Z
PLL†
No
1
0
Active
Active
Input clock (PLL bypass)
Yes
1
1
Active
Active
PLL†
No
† CLK input frequency < 2 MHz switches the outputs to low level
Copyright
 2001 – 2003, 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.
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.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLKIN
1Y0
1Y1
VDD
GND
2Y0
2Y1
S2
FBIN
1Y3
1Y2
VDD
GND
2Y3
2Y2
S1
D PACKAGE (SOIC)
PW PACKAGE (TSSOP)
(TOP VIEW)


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