Analog Devices Inc./Maxim Integrated MAX31D80T-003+T

Overview

MAX31D80T-003+T from Maxim Integrated is a down-dithered spread-spectrum clock generator IC that synthesizes a 12MHz output clock from a 12MHz crystal or clock input using an internal PLL, operates at 3.3V, delivers ≤75ps cycle-to-cycle jitter, and supports automotive-grade operation from −40°C to +125°C in graphics card timing applications.

For engineers reviewing the MAX31D80T-003+T datasheet, MAX31D80T-003+T pinout, MAX31D80T-003+T application, or MAX31D80T-003+T equivalent, this page provides verified functional identity, factory-programmed dither mode and frequency, automotive temperature compliance, TDFN-EP package mapping, and real-world design implications for EMI reduction in embedded timing systems.

Technical Context

The MAX31D80T-003+T implements a fully integrated PLL-based clock synthesis architecture with dedicated spread-spectrum modulation logic configured exclusively for down-dither operation. Its input accepts either a 12MHz crystal (8–34MHz range) or 12MHz clock (8–134MHz), and its output CLKOUT delivers a factory-programmed 12MHz down-dithered signal with 25kHz dither rate and up to −3% modulation depth.

It features dual buffered outputs: CLKOUT carries the spread-spectrum-modulated 12MHz signal, while XOUT replicates the unmodulated 12MHz input clock. Configuration of dither magnitude is performed via SMSEL0/SMSEL1 pins, requiring power-cycle reset after change - no I²C or serial interface is present.

Key Specifications

Pinout & Package

MAX31D80T-003+T is housed in a 10-pin TDFN-EP package (3mm × 3mm × 0.8mm) with exposed pad (EP) soldered to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX31C80T-002+ and ICS843001AGI-01LFT, the MAX31D80T-003+T uniquely delivers factory-programmed 12MHz down-dither operation in automotive-grade TDFN, making it irreplaceable for cost-sensitive, EMI-constrained 12MHz timing nodes where center-spread or differential outputs are unnecessary.

Availability

MAX31D80T-003+T is available at Aetrix Electronics and suitable for graphics cards, automotive infotainment displays, and industrial printers requiring stable component supply with guaranteed automotive temperature qualification and RoHS-compliant packaging.

Supply support for MAX31D80T-003+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 (now part of Analog Devices) designs precision analog, mixed-signal, and timing ICs for automotive, industrial, and communications markets, with emphasis on high-reliability, low-power, and EMI-optimized solutions.

The MAX31D80T-003+T belongs to Maxim's spread-spectrum clock generator product line, engineered specifically to reduce electromagnetic interference in timing-critical embedded systems without compromising jitter performance or thermal robustness.

FAQ

What is the factory-programmed output frequency and dither type of MAX31D80T-003+T?

The MAX31D80T-003+T is factory-programmed for a fixed 12MHz output frequency with down-dither spread-spectrum modulation and a 25kHz dither rate. This configuration is permanently set during manufacturing and cannot be altered in-circuit; the "003" suffix in the part number explicitly denotes this 12MHz/25kHz/down-dither variant per Maxim's Selector Guide.

Does MAX31D80T-003+T support crystal or clock input - and what are the requirements?

MAX31D80T-003+T accepts either a 12MHz crystal (across X1–X2) or a 12MHz CMOS clock applied to X1. For crystal operation, the MAX31D80T-003+T requires 18pF load capacitance and ≤90Ω ESR; for clock input, X2 must remain open. Input duty cycle must be 40–60%, and logic thresholds follow standard 3.3V-compatible levels.

What is the purpose of the XOUT pin on MAX31D80T-003+T, and how does it differ from CLKOUT?

The XOUT pin on MAX31D80T-003+T provides a buffered, unmodulated replica of the 12MHz input signal applied to X1, while CLKOUT delivers the spread-spectrum-modulated 12MHz output. This allows system designers to route clean timing to synchronous logic blocks (via XOUT) and EMI-reduced clocks to noise-sensitive interfaces (via CLKOUT) from a single device.

How is spread-spectrum magnitude configured on MAX31D80T-003+T, and does it require programming?

Spread-spectrum magnitude on MAX31D80T-003+T is configured using the SMSEL0 and SMSEL1 pins per Table 1 in the datasheet, supporting down-dither depths from 0% to −3%. No programming interface is needed - configuration is static and set by external pull-up/pull-down resistors. A full power cycle is mandatory after changing these pins for new settings to take effect.

Is MAX31D80T-003+T qualified for automotive applications, and what temperature range does it cover?

Yes, MAX31D80T-003+T is explicitly qualified for automotive applications, operating across the full −40°C to +125°C junction temperature range. It meets AEC-Q100 stress testing requirements for timing devices and is packaged in a RoHS-compliant 10-pin TDFN-EP (3mm × 3mm) with exposed pad tied to GND for thermal stability in under-hood environments.