LTC6905CS5-133#TRMPBF

Programmable Timers And Oscillators Overview

The LTC6905CS5-133#TRMPBF is a fixed frequency silicon oscillator from Analog Devices, operating at a master clock of 133MHz. It provides three selectable output frequencies (133MHz, 66.7MHz, and 33.3MHz) via an internal three-state divider controlled by the DIV pin. The device features a typical frequency accuracy of ±0.5% and a temperature stability of ±20ppm/°C. It operates on a single supply voltage ranging from 2.7V to 5.5V with a typical supply current of 10mA at 3.6V. The output is CMOS, capable of driving loads up to 600Ω, with a typical rise time of 0.5ns and timing jitter under 0.8%.

Programmable Timers And Oscillators Feature Summary

• Factory-programmed fixed frequency of 133MHz with no external components required.
• Internal three-state divider allows selection of ÷1, ÷2, or ÷4 ratios for flexible frequency options.
• High precision with ±0.5% typical frequency accuracy and ±20ppm/°C temperature coefficient.
• Fast start-up time of typically 100µs and low profile 1mm ThinSOT package.

Programmable Timers And Oscillators Applications

• Data clocks for high reliability applications.
• Clock sources in environments subject to high vibration and acceleration.
• Replacement for fixed crystal and ceramic oscillators where board space is limited.

Programmable Timers And Oscillators Procurement Notes

Verify that the #TRMPBF suffix indicates tape and reel packaging with lead-free compliance. Confirm the 'C' grade designation corresponds to the specified commercial temperature range of 0°C to 70°C. Ensure the order quantity matches the manufacturer's standard reel size requirements.

Programmable Timers And Oscillators Selection Notes

Select this part when a precise 133MHz source is needed without external trimming resistors. Consider the LTC6905IS5 variant if operation below 0°C is required, as the CS5 grade is not guaranteed for performance outside the 0°C to 70°C range. Evaluate power supply noise levels, as ripple exceeding 20mV may increase output jitter.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6905-XXX series of precision silicon oscillators. Other members include the LTC6905-100, LTC6905-96, and LTC6905-80, which offer different base frequencies. The series is designed to minimize board space while maximizing accuracy compared to traditional discrete oscillator solutions.

Programmable Timers And Oscillators Replacement Considerations

Direct functional replacements within the same family include the LTC6905CS5-100, LTC6905CS5-96, and LTC6905CS5-80, provided the specific frequency requirement can be adjusted. For industrial temperature ranges, the LTC6905IS5-133#TRMPBF is the appropriate alternative.

Programmable Timers And Oscillators FAQ

How is the output frequency divided?

The DIV pin controls the internal divider. Tying it to V+ selects ÷1 (133MHz), leaving it floating selects ÷2 (66.7MHz), and tying it to GND selects ÷4 (33.3MHz).

What is the maximum capacitive load the output can drive?

The output can drive a capacitive load of 5pF directly. Heavier loads depend on the frequency and output resistance; for example, at 50MHz, the max load is approximately 33.6pF.

How does the Output Enable (OE) pin function?

Pulling OE low disables the output asynchronously. Pulling OE high enables the output synchronously on the next low-to-high clock transition, preventing pulse slivers.