Analog Devices Inc. LTC6905IS5-133#TRPBF

Overview

LTC6905IS5-133#TRPBF from Analog Devices (formerly Linear Technology) is a precision fixed-frequency silicon oscillator in ThinSOT-23 package, delivering factory-trimmed output frequencies of 133.33MHz, 66.66MHz, or 33.33MHz via internal ÷1/÷2/÷4 divider; features ±0.5% typical frequency accuracy at 25°C, ±20ppm/°C temperature stability, and rail-to-rail CMOS output driving 600Ω loads; used in high-reliability data clocking for aerospace, industrial control, and test equipment.

For engineers reviewing the LTC6905IS5-133#TRPBF datasheet, LTC6905IS5-133#TRPBF pinout, LTC6905IS5-133#TRPBF application, or LTC6905IS5-133#TRPBF equivalent, key selection criteria include guaranteed frequency accuracy over –40°C to 85°C, fast 100µs start-up time, OE-controlled synchronous enable/disable, low timing jitter (<0.8% typical), and compatibility with 2.7V–5.5V single-supply systems.

Technical Context

The LTC6905IS5-133#TRPBF implements a master oscillator core with programmable integer division (N = 1, 2, or 4) controlled by the DIV pin's voltage state-tied high (V+), floating, or grounded. Its internal bias circuitry actively detects floating DIV using dual 15µA current sources, enabling robust three-state logic without external buffers.

It operates as a self-contained clock source with no external timing components: frequency is factory-set and trimmed, supply voltage coefficient is 0.5%/V (2.7V–3.6V), and output rise/fall time is 0.5ns into 5pF load. The OE pin provides asynchronous disable and synchronous enable, eliminating pulse glitches during activation.

Key Specifications

Pinout & Package

Package: 5-lead TSOT-23 (ThinSOT), 1mm profile, JEDEC MO-193 compliant, footprint compatible with standard SOT-23 layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-frequency oscillator applications.

Compared with LTC6905CS5-133#TRPBF, the LTC6905IS5-133#TRPBF guarantees full –40°C to 85°C operation and includes enhanced screening for industrial use; versus SiT8008BI-13-33E-133.333333M, it offers broader supply voltage support and drop-in SOT-23 compatibility but trades off ppm-level stability for ease of integration and cost.

Availability

LTC6905IS5-133#TRPBF is available at Aetrix Electronics and suitable for high-reliability data acquisition, aerospace avionics timing, and industrial PLC clock modules requiring stable component supply across extended temperature ranges.

Supply support for LTC6905IS5-133#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog and mixed-signal product lines with rigorous qualification standards.

The LTC6905 series was designed as a pin-compatible silicon replacement for quartz crystal and ceramic oscillators, targeting space-constrained, high-vibration applications where mechanical resonance and start-up delay are unacceptable.

FAQ

What is the operating temperature range for the LTC6905IS5-133#TRPBF?

The LTC6905IS5-133#TRPBF is rated for an operating temperature range of –40°C to +85°C, with full electrical specifications guaranteed across this range. Its specified performance range matches the I-grade qualification, making it suitable for industrial and automotive under-hood applications where thermal extremes are expected. Unlike the C-grade variant, the LTC6905IS5-133#TRPBF undergoes extended temperature testing and screening to ensure reliability at both endpoints.

How does the DIV pin select output frequency on the LTC6905IS5-133#TRPBF?

The DIV pin on the LTC6905IS5-133#TRPBF selects one of three output frequencies via its voltage state: tying DIV to V+ selects ÷1 (133.33MHz), leaving DIV floating selects ÷2 (66.66MHz), and tying DIV to GND selects ÷4 (33.33MHz). The device uses internal 15µA current sources to detect the floating state reliably, eliminating need for external pull-up/down resistors. This three-state logic is documented in Table 1 and the Pin Functions section of the datasheet.

Does the LTC6905IS5-133#TRPBF require external components for basic operation?

No, the LTC6905IS5-133#TRPBF requires no external timing components for operation. It is a fully integrated silicon oscillator with factory-trimmed frequency. Only a 0.1µF ceramic bypass capacitor between V+ and GND is mandatory for stable performance. No load resistors, termination networks, or frequency-setting resistors/capacitors are needed - simplifying design and reducing bill-of-materials count compared to crystal-based solutions.

What is the start-up time specification for the LTC6905IS5-133#TRPBF?

The LTC6905IS5-133#TRPBF has a typical start-up time of 100µs to settle within 1% of final frequency, as confirmed in the Typical Performance Characteristics and Applications Information sections. This fast wake-up supports power-gated systems and low-duty-cycle instrumentation where rapid clock availability is critical. Start-up behavior is independent of supply ramp rate and remains consistent across the full –40°C to 85°C temperature range.

Can the LTC6905IS5-133#TRPBF drive a 50Ω transmission line directly?

The LTC6905IS5-133#TRPBF cannot drive a 50Ω transmission line directly without signal degradation. Its CMOS output is specified to drive 600Ω loads at 4mA, and its output impedance is ~27Ω at 3V (per ROUT vs V+ graph). To drive 50Ω, a series resistor (e.g., 43Ω) should be added at the source to match impedance and prevent reflections - as shown in the "Driving a 50Ω Cable" typical application circuit (Figure TA02). Direct connection risks excessive current draw and distorted edges.