DS1087L Datasheet, PDF (1/12 Pages) Dallas Semiconductor – 3.3V Spread-Spectrum EconOscillator

Rev 1; 11/03
3.3V Spread-Spectrum EconOscillator
General Description
The DS1087L is a clock generator that produces a
spread-spectrum (dithered) square-wave output of fre-
quencies from 130kHz to 66.6MHz. The DS1087L is
shipped from the factory programmed at a specific fre-
quency and spread-spectrum percentage. The user still
has access to an internal frequency divider, selectable
2% or 4% dithered output, and programmable output
power-down/disable mode through a 2-wire program-
ming interface. All the device settings are stored in non-
volatile (NV) EEPROM allowing it to operate in
stand-alone applications. The DS1087L has power-
down and output-enable control pins for power-sensi-
tive applications.
Printers
Copiers
PCs
Computer Peripherals
Cell Phones
Cable Modems
Applications
Features
♦ Factory Programmed Square-Wave Generator
from 130kHz to 66.6MHz
♦ No External Timing Components Required
♦ EMI Reduction
♦ 2.7V to 3.6V Supply
♦ User Programmable Down to 130kHz with Divider
(Dependent on Master Oscillator Frequency)
♦ 2% or 4% Selectable Dithered Output
♦ Glitchless Output-Enable Control
♦ 2-Wire Serial Interface
♦ Nonvolatile Settings
♦ Power-Down Mode
♦ Programmable Output Power-Down/Disable Mode
PART
DS1087LU-yxx
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 µSOP (118 mils)
Standard Frequency Options
PART
DS1087LU-202
DS1087LU-402
DS1087LU-210
DS1087LU-216
DS1087LU-266
DS1087LU-466
DS1087LU-yxx
FREQUENCY (MHz)
2.0480
2.0480
10.0
16.6
66.6
66.6
Fixed up to 66.6
SPREAD (%)
2
4
2
2
2
4
2 or 4
Custom frequencies and over 20 standard frequencies avail-
able, contact factory.
EconOscillator is a trademark of Dallas Semiconductor.
Typical Operating Circuits appear at end of data sheet.
TOP VIEW
Pin Configuration
OUT 1
SPRD 2
V_CC 3
GND 4
DS1087L
8 SCL
7 SDA
6 PDN
5 OE
µSOP (118 mils)
______________________________________________ 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.