LTC6905HS5-100#TRMPBF

Programmable Timers And Oscillators Overview

The LTC6905HS5-100#TRMPBF is a fixed frequency silicon oscillator from Analog Devices, operating at a master clock of 100MHz. It provides three selectable output frequencies (100MHz, 50MHz, and 25MHz) via an internal three-state divider controlled by the DIV pin. The device features ±0.5% typical frequency accuracy, ±20ppm/°C temperature stability, and a typical start-up time of 100µs. It operates on a single supply voltage ranging from 2.7V to 5.5V with a typical supply current of 8mA at 100MHz. The output is CMOS, capable of driving loads up to 600Ω, and includes an Output Enable (OE) pin for synchronous control. It is housed in a low-profile 1mm ThinSOT SOT-23-5 package.

Programmable Timers And Oscillators Feature Summary

• Fixed Frequency: Factory programmed to 100MHz master clock with divide-by-1, 2, or 4 options.
• High Accuracy: ±0.5% typical frequency error at 25°C; ±20ppm/°C temperature coefficient.
• Fast Start-Up: Typical settling time of 100µs to within 1% of final frequency.
• Low Power & Compact: 8mA typical supply current; 1mm height ThinSOT SOT-23-5 package.

Programmable Timers And Oscillators Applications

• Data clocks for high reliability applications
• Replacement for fixed crystal and ceramic oscillators
• High vibration and high acceleration environments

Programmable Timers And Oscillators Procurement Notes

Verify the ordering suffix #TRMPBF corresponds to the Tape and Reel packaging format as specified in the datasheet. Confirm the 'H' grade indicates the -40°C to 125°C extended temperature range. Ensure the part number matches the specific 100MHz frequency variant within the LTC6905-XXX series.

Programmable Timers And Oscillators Selection Notes

Select this part when a fixed 100MHz source is required without external trimming components. Choose the HS5 package for space-constrained designs requiring a 1mm profile. Ensure the application environment stays within the -40°C to 125°C operating range defined by the 'H' grade. Verify that the load requirements do not exceed the 600Ω minimum resistive drive capability.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6905-XXX family of precision silicon oscillators. Other variants include the LTC6905-133 (133MHz), LTC6905-96 (96MHz), and LTC6905-80 (80MHz). All share the same package and functional architecture but differ in their factory-programmed master frequencies.

Programmable Timers And Oscillators Replacement Considerations

Direct replacements are other members of the LTC6905-XXX series if different frequencies are acceptable. For resistor-set programmable oscillators, consider the LTC6905IS5. For serial programmable options, the LTC6903 or LTC6904 may be suitable alternatives.

Programmable Timers And Oscillators FAQ

How is the output frequency divided?

The internal three-state divider allows division by 1, 2, or 4. Tying the DIV pin to V+ selects ÷1 (100MHz), floating it selects ÷2 (50MHz), and tying it to GND selects ÷4 (25MHz).

What is the function of the OE pin?

The Output Enable (OE) pin disables the output when pulled low and synchronously enables it when pulled high, preventing pulse slivers during state transitions.

What is the maximum capacitive load the output can drive?

The output can drive a capacitive load of 5pF directly. For larger loads, the maximum capacitance depends on the frequency and output resistance, calculated to ensure rise/fall times remain within 20% of the period.