Datasheet > DS1099U-ES

DS1099U-ES

更新时间： 2023-01-03 00:44:06

品牌	Logo	应用领域
达拉斯 - DALLAS		/
页数	文件大小	规格书
6页	78K
描述
Oscillator,

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数据手册

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DS1099U-ES 数据手册

Lo w -Fre q u e n c y Du a l Ec o n Os c illa t o r

Fu n c t io n a l Dia g ra m

MASTER

OSCILLATOR

1.048MHz

DS1099

GND

MOSC

DIVIDER 0

DIVIDE BY 2

OUT0

OUTPUT

DRIVER

OUT0

OUT1

(X = X = 0...22)

FACTORY-

PROGRAMMED

EEPROM

DIVIDER 1

DIVIDE BY 2

OUTPUT OUT1

DRIVER

(X = X = 0...22)

OE0

OE1

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-

e na ble pins only disa ble the c orre sponding output

driver(s) and do not shut down the master oscillator or

the dividers.

De t a ile d De s c rip t io n

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

Since the master oscillator frequency, f

the frequency of OUT0 and OUT1 is determined by

DIVIDER 0 and DIVIDER 1, respectively. And since

, is fixed,

MOSC

DIVIDER SETTING

DIVISOR

OR f

OUT0 OUT1

X OR X

1.048MHz

0.524MHz

0.262MHz

0.131MHz

65.50kHz

32.75kHz

—

each output has its own divider, f

and f

can

OUT0

OUT1

be programmed independent of each other.

The frequency of the outputs are calculated as follows:

/ 2 = 1.048MHz / 2

= f

OUT0

MOSC

/ 2 = 1.048MHz / 2

MOSC

OUT1

whe re X is the DIVIDER 0 s e tting a nd X is the

DIVIDER 1 setting. Valid values for X and X are inte-

—

gers 0 to 22 (dec).

524,288

1,048,576

2,097,152

4,194,304

2Hz

Table 1 shows output frequencies and divider values

for the range of divider settings.

1Hz

0.5Hz

0.25Hz

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