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DS1088C

Fixed-Frequency EconoOscillator™

Detailed Description

The DS1088C is a low-cost clock generator that pro-

duces a square-wave output without external timing com-

ponents. The fixed-frequency oscillator is available in a

factory-calibrated frequency of 133MHz. The DS1088C

has a power-down pin for power-sensitive applications.

A block diagram of the DS1088C is shown in Figure 1.

Output Frequency

The internal oscillator frequency is divided by the factory-

programmed prescaler to produce an output frequency

of 133MHz.

Power-Down Mode

The PDN pin disables the internal oscillator and the

oscillator output for power-sensitive applications. The

power-down pin must remain low for at least two output

frequency cycles plus 10µs for deglitching purposes. On

power-up, the output is disabled until power is stable

and the voltage-controlled oscillator has generated 512

clock cycles.

Applications Information

Power-Supply Decoupling

To achieve the best results when using the DS1088C,

the power supply must be decoupled with 0.01µF and

0.1µF high-quality, ceramic, surface-mount capacitors.

Surface-mount components minimize lead inductance,

which improves performance, and tend to have ade-

quate high-frequency response for decoupling applica-

tions. These capacitors should be placed as close as

Chip Information

SUBSTRATE CONNECTED TO GROUND

Figure 1. Block Diagram

PDN

OUT

133MHz

EEPROM

CONTROL

VOLTAGE-

CONTROLLED

OSCILLATOR

80MHz TO 160MHz

PRESCALER

÷ BY 1, 2, 4...256

GND

DS1088C