CDCVF2510
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
SCAS638 – DECEMBER 1999
PW PACKAGE
(TOP VIEW)
Designed to Meet and Exceed PC133
SDRAM Registered DIMM Specification
Rev. 1.1
AGND
CLK
AV
1
24
23
22
21
20
19
18
17
16
Spread Spectrum Clock Compatible
V
2
CC
CC
Operating Frequency 50 MHz to 175 MHz
1Y0
1Y1
1Y2
GND
GND
1Y3
V
3
CC
Static Phase Error Distribution at 66MHz to
166 MHz is ±125 ps
1Y9
1Y8
GND
GND
1Y7
1Y6
4
5
6
Jitter (cyc – cyc) at 66 MHz to 166 MHz Is
|70| ps
7
8
Advanced Deep Sub-Micron Process
Results in More Than 40% Lower Power
Consumption Versus Current Generation
PC133 Devices
1Y4
9
V
10
11
12
15 1Y5
CC
G
V
14
13
CC
FBOUT
FBIN
Available in Plastic 24-Pin TSSOP
Phase-Lock Loop Clock Distribution for
Synchronous DRAM Applications
Distributes One Clock Input to One Bank of
Ten 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
description
The CDCVF2510 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 CDCVF2510 operates at 3.3 V V . It also
CC
provides integrated series-damping resistors that make it ideal for driving point-to-point loads.
One bank of ten outputs provides ten 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.
Unlike many products containing PLLs, the CDCVF2510 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 CDCVF2510 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 AV
to ground.
CC
The CDCVF2510 is characterized for operation from 0°C to 85°C.
For application information refer to application reports High Speed Distribution Design Techniques for
CDC509/516/2509/2510/2516 (literature number SLMA003) and Using CDC2509A/2510A PLL with Spread
Spectrum Clocking (SSC) (literature number SCAA039).
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.
Copyright 1999, 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.
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