DS1075Z-20

Overview

The DS1075Z-20 is a fixed-frequency oscillator from the EconOscillator family, designed for single 5V supply operation. It generates dual outputs within a frequency range of approximately 30 KHz to 100 MHz using an internal master oscillator, programmable prescaler, and divider. The device features user-programmable on-chip registers stored in nonvolatile memory, allowing field configuration without external components. Key specifications include 0.5% initial tolerance and 1% variation over temperature and voltage. It supports internal clock, external clock, or crystal references and includes power-down and synchronous output gating capabilities.

Feature Summary

• Dual fixed-frequency outputs with user-programmable dividers (1-513) and prescalers (1, 2, 4).
• Zero external components required; factory-configured default is half maximum operating frequency.
• Single 5V supply operation with power-down mode reducing current to 0.8 uA typical.
• Synchronous output enable prevents pulse truncation; glitch-free switching between reference sources.

Applications

• Microcontroller system clock generation.
• Real-time clock circuits requiring stable timing references.
• Serial communication interfaces needing precise baud rate clocks.
• Embedded systems requiring field-reprogrammable oscillator frequencies.

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package type matches design requirements, as the Z suffix indicates SOIC packaging. Check for end-of-life status or obsolescence notices, as this series may be discontinued. Ensure programming hardware compatibility if field reconfiguration is needed.

Selection Notes

Select based on required output frequency and reference source preference. The DS1075 allows post-manufacturing frequency adjustment via 1-Wire programming. Consider power consumption constraints; use power-down mode for low-power applications. Verify load capacitance limits (15 pF typical) to ensure signal integrity. Evaluate thermal performance within the 0°C to 70°C operating range.

Part Context

The DS1075 belongs to Maxim Integrated's EconOscillator line, offering flexibility compared to fixed-frequency crystals. It replaces discrete oscillator circuits by integrating the master oscillator, prescaler, and divider on a single chip. The device simplifies board design by eliminating external resonators and capacitors, reducing component count and board space.

Replacement Considerations

Direct replacements are limited due to specific programming capabilities. Similar devices from Analog Devices/Maxim Integrated should be evaluated for pin compatibility and electrical characteristics. Verify that alternative oscillators support the same 1-Wire programming interface if field reconfiguration is required.

FAQ

How is the DS1075 programmed?

Programming is performed using a variant of the 1-Wire protocol. The device enters programming mode when powered up with a pull-up resistor on the IN/OUT pin. Data is written to nonvolatile EEPROM registers for the MUX and DIV words.

What is the function of the PDN/SELX pin?

The PDN/SELX pin has a dual function determined by a programmable bit. If set to Power-Down mode, it disables the oscillator to save power. If set to Select mode, it allows switching between internal and external/crystal references on the fly.

Can the output duty cycle be adjusted?

The datasheet specifies a typical output duty cycle of 40% to 60%. It does not provide user-adjustable parameters for duty cycle modification; the frequency is adjusted via the programmable divider and prescaler settings.