Low-Frequency Dual EconOscillator

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5

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-

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.

the frequency of OUT0 and OUT1 is determined by

DIVIDER 0 and DIVIDER 1, respectively. And since

be programmed independent of each other.

The frequency of the outputs are calculated as follows:

gers 0 to 22 (dec).

Table 1 shows output frequencies and divider values

for the range of divider settings.

Table 1. Divider Settings and Output

Frequencies

DIVIDER SETTING

DIVISOR

0

1

1.048MHz

1

2

0.524MHz

2

4

0.262MHz

3

8

0.131MHz

4

16

65.50kHz

5

32

32.75kHz

———

19

524,288

2Hz

20

1,048,576

1Hz

21

2,097,152

0.5Hz

22

4,194,304

0.25Hz

Functional Diagram

DS1099

GND

MASTER

OSCILLATOR

1.048MHz

DIVIDER 0

DIVIDER 1

OE1

OE0

OUT0

OUT1

FACTORY-

PROGRAMMED

EEPROM

OUTPUT

DRIVER

OUTPUT

DRIVER