Detailed Description

The DS1088L is a low-cost clock generator that pro-

duces a square-wave output without external timing

components. The fixed-frequency oscillator is available in

factory-calibrated frequencies from 312kHz to 133MHz.

The device has a power-down pin for power-sensitive

applications. A block diagram is shown in Figure 1.

Output Frequency

The internal oscillator frequency is divided by the factory-

programmed prescaler to produce an output frequency

of 312kHz to 133MHz. Contact the factory for custom

frequencies.

Power-Down Mode

The PDN pin disables the internal oscillator and the oscil-

lator 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 DS1088L, 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 adequate high-

frequency response for decoupling applications. These

capacitors should be placed as close as possible to the

Chip Information

SUBSTRATE CONNECTED TO GROUND

Figure 1. Block Diagram

PDN

OUT

(312kHz

TO 133MHz)

EEPROM

CONTROL

VOLTAGE-

CONTROLLED

OSCILLATOR

80MHz TO 160MHz

PRESCALER

÷ BY 1, 2, 4...256

GND

DS1088L

DS1088L

Fixed-Frequency EconOscillator™

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