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CDCUA877ZQLR датащи(PDF) 1 Page - Texas Instruments

номер детали CDCUA877ZQLR
подробное описание детали  1.8-V PHASE LOCK LOOP CLOCK DRIVER
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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CDCUA877ZQLR датащи(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION
CDCUA877
SCAS769A – AUGUST 2006 – REVISED JUNE 2007
1.8-V PHASE LOCK LOOP CLOCK DRIVER
• Distributes One Differential Clock Input to Ten
Differential Outputs
• 1.8-V/1.9-V Phase Lock Loop Clock Driver for
Double Data Rate (DDR II) Applications
• 52-Ball μBGA (MicroStar Junior™ BGA,
0,65-mm pitch)
• Spread Spectrum Clock Compatible
• External Feedback Pins (FBIN, FBIN) are Used
• Operating Frequency: 125 MHz to 410 MHz
to Synchronize the Outputs to the Input
• Application Frequency: 160 MHz to 410 MHz
Clockst
• Low Current Consumption: <200 mA Typ
• Meets or Exceeds CUA877/CAU878
• Low Jitter (Cycle-Cycle): ±40 ps
Specification PLL Standard for
• Low Output Skew: 35 ps
PC2-3200/4300/5300/6400o
• Stabilization Time <6 μs
• Fail-Safe Inputs
The CDCUA877 is a high-performance, low-jitter, low-skew, zero-delay buffer that distributes a differential clock
input pair (CK, CK) to ten differential pairs of clock outputs (Yn, Yn) and to one differential pair of feedback clock
outputs (FBOUT, FBOUT). The clock outputs are controlled by the input clocks (CK, CK), the feedback clocks
(FBIN, FBIN), the LVCMOS control pins (OE, OS), and the analog power input (AVDD). When OE is low, the
clock outputs, except FBOUT/FBOUT, are disabled while the internal PLL continues to maintain its locked-in
frequency. OS (output select) is a program pin that must be tied to GND or VDD. When OS is high, OE functions
as previously described. When OS and OE are both low, OE has no affect on Y7/Y7, they are free running.
When AVDD is grounded, the PLL is turned off and bypassed for test purposes.
When both clock inputs (CK, CK) are logic low, the device enters in a low power mode. An input logic detection
circuit on the differential inputs, independent from input buffers, detects the logic low level and performs in a low
power state where all outputs, the feedback, and the PLL are off. When the clock inputs transition from being
logic low to being differential signals, the PLL turns back on, the inputs and the outputs are enabled, and the
PLL obtains phase lock between the feedback clock pair (FBIN, FBIN) and the clock input pair (CK, CK) within
the specified stabilization time.
The CDCUA877 is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from
–40
°C to 85°C).
AVAILABLE OPTIONS
TA
52-Ball BGA(1)
–40
°C to 85°C
CDCUA877ZQL
(1)
For the most current package and ordering information, see the
Package Option Addendum at the end of this document, or see the
TI website at www.ti.com.
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.
MicroStar Junior is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2007, 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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