DS1073M-66

Overview

The DS1073M-66 is a fixed-frequency oscillator and divider from Analog Devices/Maxim Integrated, generating a 66.667MHz output. It operates on a 2.7V to 3.6V supply with industrial temperature ratings (-40°C to +85°C). The device features dual outputs (I/O and OUT0), user-programmable prescalers and dividers via non-volatile memory, and supports internal, external clock, or crystal references. Key electrical parameters include ±0.5% initial frequency tolerance, ±2.5% combined variation over temperature and voltage, and a typical active supply current of 50mA at CL=15pF.

Feature Summary

• Dual fixed-frequency outputs with a maximum frequency of 66.667MHz for this specific suffix.
• User-programmable on-chip dividers (range 2 to 513) and prescaler (divide-by-2 or -4) stored in non-volatile EEPROM.
• Supports internal oscillator, external clock input (up to 50MHz), or fundamental mode crystal reference.
• Features synchronous output gating (OE pin) and selectable power-down or select functions via the PDN/SELX pin.

Applications

• Clock generation for microprocessors and digital logic systems requiring precise timing.
• Frequency synthesis in communication equipment utilizing external reference inputs.
• Industrial instrumentation where programmable frequency options and wide temperature operation are required.

Procurement Notes

Verify the specific ordering suffix matches the required frequency option (e.g., -66 for 66.667MHz). Confirm package type requirements, as M suffix denotes 300-mil DIP while Z denotes SOIC. Ensure programming tools compatible with the 1-Wire protocol are available if field reprogramming is necessary. Check datasheet for absolute maximum ratings regarding voltage tolerances on all pins relative to ground.

Selection Notes

Select the DS1073M-66 when a fixed 66.667MHz clock is needed without external components. Consider the -60, -80, or -100 variants if different fixed frequencies are preferred. Evaluate the need for programmability; if fixed frequency is sufficient, factory-programmed units simplify deployment. Verify load capacitance requirements (typically 15pF) to ensure signal integrity. Assess power consumption needs, noting the standby current is significantly lower than the active 50mA typical draw.

Part Context

The DS1073 series belongs to the EconOscillator family designed to replace discrete oscillator circuits. The 'M' suffix indicates a 300-mil DIP package, distinguishing it from the surface-mount 'Z' variant. This component integrates the master oscillator, prescaler, and divider into a single chip, reducing board space and design complexity compared to multi-component solutions.

Replacement Considerations

Direct replacements within the same family include DS1073M-60 (60MHz), DS1073M-80 (80MHz), and DS1073M-100 (100MHz) for different fixed frequencies. For surface mount applications, the DS1073Z-XXX equivalents are pin-compatible but differ in package dimensions. Cross-brand alternatives require verification of pinout compatibility and 1-Wire programming interface support.

FAQ

How is the programming mode entered?

Programming mode is initiated by powering up the device with a pull-up resistor (approximately 5kΩ) connected between the I/O pin and VCC. This pulls the I/O pin high during power-on reset, triggering the internal programming state.

What is the function of the OUT0 pin?

OUT0 provides a buffered output of the reference clock (master clock). It is unaffected by the Output Enable (OE) pin but is disabled during power-down sequences. It can be permanently disabled by setting the EN0 bit to 1 to reduce power consumption.

Can the device switch between internal and external clocks dynamically?

Yes, if the PDN bit is programmed to 0, the PDN/SELX pin acts as a Select (SELX) input. A high level selects the internal oscillator, while a low level selects the external reference or crystal, allowing glitch-free switching.