LTC6905IS5#TRPBF

Programmable Timers And Oscillators Overview

The LTC6905IS5#TRPBF is a precision, programmable silicon oscillator manufactured by Analog Devices Inc. It operates within a frequency range of 17MHz to 170MHz and requires only a single external resistor (RSET) between 10kΩ and 25kΩ to set the output frequency. The device features a typical frequency error of ±0.5% at 25°C and ±2.5% over the full industrial temperature range (-40°C to 85°C). It functions on a single supply voltage from 2.7V to 5.5V, drawing a typical supply current of 6mA at 100MHz. The output is a rail-to-rail CMOS square wave with a 50% duty cycle, housed in a low-profile 5-lead TSOT-23 package.

Programmable Timers And Oscillators Feature Summary

• Frequency Range: 17MHz to 170MHz via single external resistor
• High Precision: ±0.5% typical frequency accuracy at 25°C; ±20ppm/°C temperature stability
• Programmable Divider: Internal ÷1, ÷2, or ÷4 divider selectable via DIV pin
• Low Power: Typical supply current of 6mA at 100MHz; 14mA max at 170MHz
• CMOS Output: Rail-to-rail switching with 0.5ns rise/fall times

Programmable Timers And Oscillators Applications

• High-speed data bus clock generation
• Replacement for fixed crystal oscillators
• Replacement for ceramic resonators/oscillators
• Timing reference for digital circuits requiring precise frequency setting

Programmable Timers And Oscillators Procurement Notes

Verify the suffix IS5 indicates the -40°C to 85°C industrial temperature grade and TRPBF denotes tape-and-reel packaging with lead-free finish. Confirm RoHS compliance status as specified in the ordering information table. Ensure the application circuit adheres to the recommended layout guidelines for RSET and bypass capacitors to maintain specified jitter and accuracy performance.

Programmable Timers And Oscillators Selection Notes

Select this part when a resistor-set oscillator is required in a small TSOT-23 package. Choose the IS5 variant for industrial temperature applications (-40°C to 85°C); use CS5 for commercial (0°C to 70°C) or HS5/MPS5 for extended ranges. Calculate RSET using the provided formula based on the desired frequency and divider setting (N=1, 2, or 4). Ensure the power supply noise does not contain components near fMO/64 to prevent frequency modulation errors.

Programmable Timers And Oscillators Part Context

The LTC6905 series includes variants such as LTC6905CS5, LTC6905HS5, and LTC6905MPS5, differentiated primarily by operating temperature ranges. Fixed-frequency versions are available under the LTC6905-XXX series, which integrate internal resistors to eliminate external component tolerance effects. The IS5#TRPBF is the specific industrial-grade, resistor-programmable version in tape-and-reel packaging.

Programmable Timers And Oscillators Replacement Considerations

For direct functional replacement with integrated internal resistance, consider the LTC6905-XXX series (e.g., LTC6905IS5-100#TRPBF for 100MHz). For lower power requirements, the LTC6906 offers micropower operation. For serial programmability, the LTC6903 or LTC6904 may be suitable alternatives if I2C/SPI interfaces are acceptable.