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PDF DS1099 Data sheet ( Hoja de datos )
| Número de pieza | DS1099 | |
| Descripción | Low-Frequency Dual EconOscillator | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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Rev 0; 2/04
Low-Frequency Dual EconOscillator
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 require-
ments.
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 +85°C
♦ ±100ppm/°C Temp Drift (MAX)
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS1099U-α0 α1*
-40°C to +85°C
8 µSOP
*Where α0 and α1 specify the factory programmed divider set-
tings for OUT0 and OUT1, respectively.
Ordering information is continued on the last page.
EconOscillator is a trademark of Dallas Semiconductor.
Typical Operating Circuit
Pin Configuration
VCC VCC
TOP VIEW
VCC
OE0
OE1 DS1099 OUT0
N.C. OUT1
N.C. GND
OE1 CAN INSTEAD
BE TIED TO VCC
IF OUT1 IS NOT USED.
OUTPUTS CAPABLE OF
SINKING 16mA
OUT1 1
OUT0 2
VCC 3
GND 4
DS1099
µSOP
8 N.C.
7 N.C.
6 OE1
5 OEO
______________________________________________ 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.
1 page  
Low-Frequency Dual EconOscillator
Functional Diagram
VCC
VCC
MASTER
OSCILLATOR
1.048MHz
GND fMOSC
FACTORY-
PROGRAMMED
EEPROM
DIVIDER 0
DIVIDE BY 2X
(X = X0 = 0...22)
DIVIDER 1
DIVIDE BY 2X
(X = X1 = 0...22)
OE0
OE1
DS1099
OUTPUT fOUT0 OUT0
DRIVER
OUTPUT fOUT1 OUT1
DRIVER
Detailed Description
The DS1099 consists of a fixed-frequency 1.048MHz
master oscillator followed by two independent factory-
programmable dividers. The two divider outputs are
connected to pins OUT0 and OUT1, which are inde-
Table 1. Divider Settings and Output
Frequencies
DIVIDER SETTING
X0 OR X1
0
1
2
3
4
5
—
19
20
21
22
DIVISOR
1
2
4
8
16
32
—
524,288
1,048,576
2,097,152
4,194,304
fOUT0 OR fOUT1
1.048MHz
0.524MHz
0.262MHz
0.131MHz
65.50kHz
32.75kHz
—
2Hz
1Hz
0.5Hz
0.25Hz
pendently enabled/disabled using the output-enable
pins, OE0 and OE1, respectively. When the output-
enable pins are active (low), the corresponding outputs
are enabled. If either output-enable pin is tied to its
inactive state (high), then the corresponding output is
disabled and forced high immediately. The output-
enable pins only disable the corresponding output
driver(s) and do not shut down the master oscillator or
the dividers.
Since the master oscillator frequency, fMOSC, is fixed,
the frequency of OUT0 and OUT1 is determined by
DIVIDER 0 and DIVIDER 1, respectively. And since
each output has its own divider, fOUT0 and fOUT1 can
be programmed independent of each other.
The frequency of the outputs are calculated as follows:
fOUT0 = fMOSC / 2X0 = 1.048MHz / 2X0
fOUT1 = fMOSC / 2X1 = 1.048MHz / 2X1
where X0 is the DIVIDER 0 setting and X1 is the
DIVIDER 1 setting. Valid values for X0 and X1 are inte-
gers 0 to 22 (dec).
Table 1 shows output frequencies and divider values
for the range of divider settings.
_____________________________________________________________________ 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DS1099.PDF ] | |
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