Datasheet

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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The DS1099 is a low-cost, low-power, low-frequency

silicon oscillator that generates two square-wave out-

puts with frequencies between 0.25Hz and 1.048MHz.

Individual output enables allow both outputs to be

enabled/disabled independently. Both outputs are

capable of sinking 16mA, allowing them to directly

interface to light-emitting diodes (LEDs) as well as other

external circuitry. The DS1099 operates over a wide

supply voltage, making it suitable for both 3V and 5V

systems. The device is shipped from the factory custom

programmed and calibrated, ready to be inserted into

the end application.

Contact the factory for custom frequencies or

requirements.

Applications

Flashing LED Status Indicators

Consumer Appliances

Automotive

Servers

Printers

Switch-Mode Power Supplies

Features

♦ Low-Cost, Low-Frequency EconOscillator™ with

Dual Outputs

♦ Factory Programmed

♦ Output Frequencies Independently Programmable

from 0.25Hz to 1.048MHz

♦ 2.7V to 5.5V Single-Supply Operation

♦ No External Timing Components Required

♦ Independent Output Enables

♦ CMOS/TTL-Compatible Outputs

♦ Oscillator Outputs Capable of Sinking 16mA to

Directly Drive LEDs

♦ Relieves Microprocessor of Periodic Interrupt

♦ Low-Power Consumption

♦ Operating Temperature Range: -40°C to +125°C

♦ ±100ppm/°C Temp Drift (MAX)

DS1099

Low-Frequency Dual EconOscillator

________________________________________________________________

Maxim Integrated Products

OE1

OEOGND

N.C.

N.C.OUT0

OUT1

μSOP

TOP VIEW

DS1099

Pin Configuration

Ordering Information

OUT0

OUT1

GND

OE0

OE1

N.C.

OE1 CAN INSTEAD

BE TIED TO V

IF OUT1 IS NOT USED.

OUTPUTS CAPABLE OF

SINKING 16mA

DS1099

Typical Operating Circuit

Rev 1; 9/07

PART TEMP RANGE PIN-PACKAGE

DS1099U- 

 1

-40°C to +125°C 8 μSOP

EconOscillator is a trademark of Dallas Semiconductor.

Ordering information is continued on the last page.

Where

and

specify the factory programmed divider set-

tings for OUT0 and OUT1, respectively.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Summary of content (6 pages)

PAGE 1
Rev 1; 9/07 Low-Frequency Dual EconOscillator The DS1099 is a low-cost, low-power, low-frequency silicon oscillator that generates two square-wave outputs with frequencies between 0.25Hz and 1.048MHz. Individual output enables allow both outputs to be enabled/disabled independently. Both outputs are capable of sinking 16mA, allowing them to directly interface to light-emitting diodes (LEDs) as well as other external circuitry.
PAGE 2
DS1099 Low-Frequency Dual EconOscillator ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC Relative to Ground ...........-0.5V to +6.0V Voltage Range on OE0 and OE1 Relative to Ground.................................-0.5V to (VCC + 0.5V), not to exceed 6.0V Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................-55°C to +125°C Soldering Temperature .......................................
PAGE 3
Low-Frequency Dual EconOscillator (VCC = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted.) PARAMETER Master Oscillator Frequency SYMBOL fMOSC Nominal Output Frequency fOUT0, fOUT1 Output Frequency Tolerance ΔfOUT Voltage Frequency Variation (Note 3) ΔfOUT Temperature Frequency Variation ΔfOUT CONDITIONS MIN 0.25 TA = +25°C, VCC = 4.1V Output Rise/Fall Time t R , tF UNITS MHz 1,048,000 Hz +1.0 TA = +25°C tPU MAX -1.0 % 3300 ppm/V 2.7V to 5.5V, TA = +25°C -2.0 +2.
PAGE 4
Typical Operating Characteristics (continued) (VCC = +5.0V, TA = +25°C, unless otherwise noted.) DUTY CYCLE (% CHANGE) SUPPLY CURRENT (μA) 160 150 140 130 120 51.0 50.0 TA = +25°C 49.0 1.0 TA = +85°C DS1099 toc06 TA = -40°C FREQUENCY CHANGE vs. SUPPLY VOLTAGE fOUT = 1MHz, TA = +25°C, CL = 15pF FREQUENCY (% CHANGE) TA = +25°C 170 52.0 DS1099 toc04 180 DUTY CYCLE vs. SUPPLY VOLTAGE OUT0 = OUT1 = 1MHz, CL = 15pF DS1099 toc05 SUPPLY CURRENT vs. VOLTAGE OEO = OE1 = VCC 0.5 0 -0.5 110 48.
PAGE 5
Low-Frequency Dual EconOscillator VCC MASTER OSCILLATOR 1.048MHz VCC GND DS1099 fMOSC FACTORYPROGRAMMED EEPROM DIVIDER 0 DIVIDE BY 2X (X = X0 = 0...22) OUTPUT DRIVER fOUT0 DIVIDER 1 DIVIDE BY 2X (X = X1 = 0...22) OUTPUT DRIVER fOUT1 OUT0 OUT1 OE0 OE1 Detailed Description The DS1099 consists of a fixed-frequency 1.048MHz master oscillator followed by two independent factoryprogrammable dividers. The two divider outputs are connected to pins OUT0 and OUT1, which are inde- Table 1.
PAGE 6
DS1099 Low-Frequency Dual EconOscillator The divider settings, X 0 and X 1 , are factory programmed. When placing an order for the DS1099, it is required to specify X0 and X1. If only one output is used, it is recommended that the unused output be disabled. The oscillator outputs are asynchronous. Since the master oscillator and dividers are free running, even when both outputs are disabled, the state of the output when OE becomes active is unknown for up to half an fOUT period.