Rev 1; 9/03
DS1086 Spread-Spectrum EconOscillator
General Description
The DS1086 EconOscillator™ is a programmable clock
generator that produces a spread-spectrum (dithered)
square-wave output of frequencies from 260kHz to
133MHz. The selectable dithered output reduces radi-
ated-emission peaks by dithering the frequency 2% or
4% below the programmed frequency. The DS1086 has
a power-down mode and an output-enable control for
power-sensitive applications. All the device settings are
stored in nonvolatile (NV) EEPROM memory allowing it
to operate in stand-alone applications.
Features
♦
User-Programmable Square-Wave Generator
♦
Frequencies Programmable from 260kHz to
133MHz
♦
2% or 4% Selectable Dithered Output
♦
Glitchless Output-Enable Control
♦
2-Wire Serial Interface
♦
Nonvolatile Settings
♦
5V Supply
♦
No External Timing Components Required
♦
Power-Down Mode
♦
10kHz Master Frequency Step Size
♦
EMI Reduction
DS1086
Applications
Printers
Copiers
PCs
Computer Peripherals
Cell Phones
Cable Modems
Ordering Information
PART
DS1086U*
DS1086Z
PIN-PACKAGE
8
µSOP
(118mil)
8 SO (150mil)
*
Future Product
Typical Operating Circuit
DITHERED 260kHz TO
133MHz OUTPUT
V
CC
N.C.
OUT
SPRD
V
CC
GND
DECOUPLING CAPACITORS
(0.1µF and 0.01µF)
*SDA AND SCL CAN BE CONNECTED DIRECTLY HIGH IF THE DS1086 NEVER NEEDS
TO BE PROGRAMMED IN-CIRCUIT, INCLUDING DURING PRODUCTION TESTING.
SCL*
V
CC
Pin Configuration
TOP VIEW
MICRO-
PROCESSOR
XTL1/OSC1
XTL2/OSC2
OUT
1
SPRD
V
CC
2
8
7
SCL
SDA
PDN
OE
DS1086
SDA*
PDN
OE
DS1086
3
6
5
GND
4
µSOP/SO
EconOscillator is a trademark of Dallas Semiconductor.
______________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
DALLAS [ DALLAS SEMICONDUCTOR ]
