CDCS503 Datasheet, PDF (1/9 Pages) Texas Instruments – Clock Buffer/Clock Multiplier With Optional SSC

CDCS503
www.ti.com .................................................................................................................................................................................................. SCAS872 – MARCH 2009
Clock Buffer/Clock Multiplier With Optional SSC
FEATURES
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• Part of a Family of Easy to use Clock
Generator Devices With Optional SSC
• Clock Multiplier With Selectable Output
Frequency and Selectable SSC
• SSC Controllable via 2 External Pins
– ±0%, ±0.5%, ±1%, ±2% Center Spread
• Frequency Multiplication Selectable Between
x1 or x4 With One External Control Pin
• Output Disable via Control Pin
• Single 3.3V Device Power Supply
• Wide Temperature Range –40°C to 85°C
• Low Space Consumption by 8 Pin TSSOP
Package
BLOCK DIAGRAM
V_DD
APPLICATIONS
• Consumer and Industrial Applications
requiring EMI reduction through Spread
Spectrum Clocking and/ or Clock
Multiplication
PACKAGE
IN 1
SSC_SEL 0 2
SSC_SEL 1 3
GND 4
CDCS503
8 ^VDD
7 ^OE
6 ^OUT
5 FS
GND
IN
SSC_SEL 0
SSC_SEL 1
FS
OE
LVCMOS
x1 or x4
/ SSC
Control
Logic
LV
CMOS
OUT
DESCRIPTION
The CDCS503 is a spread spectrum capable, LVCMOS Input Clock Buffer with selectable frequency
multiplication.
It shares major functionality with the CDCS502 but utilizes a LVCMOS input stage instead of the crystal input
stage of the CDCS502. Also an Output Enable pin has been added to the CDCS503.
The device accepts a 3.3V LVCMOS signal at the input.
The input signal is processed by a PLL, whose output frequency is either equal to the input frequency or
multiplied by the factor of 4.
The PLL is also able to spread the clock signal by ±0%, ±0.5%, ±1% or ±2% centered around the output clock
frequency with a triangular modulation.
By this, the device can generate output frequencies between 8MHz and 108MHz with or without SSC.
A separate control pin can be used to enable or disable the output. The CDCS503 operates in 3.3V environment.
It is characterized for operation from –40°C to 85°C, and available in an 8-pin TSSOP package.
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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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated