Analog Devices Inc./Maxim Integrated DS1090U-8/V+T

Overview

DS1090U-8/V+T from Maxim Integrated is a low-cost, center-dithered spread-spectrum oscillator designed as an external clock source for switched-mode power supplies. It delivers 500kHz–1MHz output frequency (factory-prescaled by 8), supports 0–8% programmable dither amplitude via J0/J1 pins, operates from 3.0V to 5.5V, and features CMOS/TTL-compatible output with -40°C to +85°C temperature range.

For engineers reviewing the DS1090U-8/V+T datasheet, DS1090U-8/V+T pinout, DS1090U-8/V+T application, or DS1090U-8/V+T equivalent, key selection factors include its resistor-programmed master oscillator (45kΩ–91kΩ RSET), dither rate control (fMOSC/512–4096 via JC0/JC1), internal 4–8MHz VCO, and µSOP-8 package compatibility with EMI-sensitive DC-DC converter timing designs.

Technical Context

The DS1090U-8/V+T integrates a voltage-controlled master oscillator (4–8MHz) biased by external RSET, a factory-fixed ÷8 prescaler, and a dual-stage dither generator. Dither amplitude (0%, 2%, 4%, or 8%) is set by J0/J1 logic levels, while dither rate (fMOSC/512, /1024, /2048, or /4096) is selected via JC0/JC1 inputs feeding a triangle-wave generator with 128× internal division.

Its architecture enables center-frequency spreading without external components beyond RSET and supply decoupling capacitors. The device uses on-chip voltage-bias feedback to modulate the master oscillator, ensuring stable dither depth across supply and temperature variations within ±2% frequency tolerance at 25°C.

Key Specifications

Pinout & Package

DS1090U-8/V+T is housed in an 8-pin µSOP package (2.0mm × 2.5mm, 0.5mm pitch), optimized for space-constrained DC-DC converter layouts and compatible with standard surface-mount reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar spread-spectrum oscillator applications.

Compared with Si5351A-B-GM and ICS843002AGI-01LFT, DS1090U-8/V+T uniquely balances cost, ease of use, and EMI tuning-requiring only resistor and logic-level pins to achieve application-specific dither optimization without software or layout complexity.

Availability

DS1090U-8/V+T is available at Aetrix Electronics and suitable for switched-mode power supplies, servers, and industrial controls requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for automated assembly.

Supply support for DS1090U-8/V+T 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

Maxim Integrated is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and timing applications.

The DS1090 series belongs to Maxim's EconOscillator™ family-designed specifically for cost-sensitive, EMI-critical power conversion systems where simple, resistor-based spread-spectrum clocking replaces more complex solutions.

FAQ

What is the output frequency range of the DS1090U-8/V+T?

The DS1090U-8/V+T provides a factory-set output frequency range of 500kHz to 1MHz, achieved by dividing its internal 4–8MHz master oscillator by a fixed factor of 8. This range is precisely tuned using an external RSET resistor (45kΩ–91kΩ) connected between pin 2 and ground. The DS1090U-8/V+T does not support frequencies outside this band, as the prescaler value is permanently programmed during manufacturing.

How do I configure dither percentage and dither rate on the DS1090U-8/V+T?

Dither percentage (0%, 2%, 4%, or 8%) is set using logic levels on pins J0 (pin 5) and J1 (pin 6) per Table 2 in the datasheet; dither rate (fMOSC/512, /1024, /2048, or /4096) is selected via JC0 (pin 7) and JC1 (pin 8) per Table 1. All four control pins must be hardwired to either VCC or GND-no floating connections. The DS1090U-8/V+T requires no external clock or serial interface to configure these parameters.

What package type and footprint does the DS1090U-8/V+T use?

The DS1090U-8/V+T uses an 8-pin µSOP package (2.0mm × 2.5mm body, 0.5mm lead pitch), with pin 1 marked by a dot or beveled edge. Its land pattern matches JEDEC MO-203AA standards and is compatible with standard reflow soldering profiles. The "V" suffix denotes lead-free, RoHS-compliant construction, and "T" indicates tape-and-reel packaging for SMT placement.

Can the DS1090U-8/V+T operate from a 3.3V supply?

Yes, the DS1090U-8/V+T fully supports 3.3V operation within its specified 3.0V to 5.5V supply range. At 3.3V, typical supply current is 1.4mA (with RSET = 40kΩ and CL = 15pF), output high voltage meets VOH ≥2.4V at −4mA load, and all timing specifications-including dither behavior and power-up stabilization time (0.1–0.5ms)-remain guaranteed across −40°C to +85°C.

Is an external decoupling capacitor required for the DS1090U-8/V+T?

Yes, Maxim Integrated explicitly recommends placing both a 0.01µF and 0.1µF ceramic capacitor between VCC (pin 3) and GND (pin 4), mounted as close as possible to the DS1090U-8/V+T package. This decoupling minimizes supply noise coupling into the oscillator core, ensuring stable dither performance and preventing jitter increase or frequency drift under dynamic load conditions.