Analog Devices Inc./Maxim Integrated MXD1000PA025

Overview

MXD1000PA025 from Maxim Integrated is a 5-tap silicon delay line with nominal tap delays of 25ns, ±2ns or ±5% tolerance (whichever greater), TTL/CMOS-compatible inputs/outputs, and 20mA supply current at +5V. It serves as a precise timing element in clock synchronization and digital signal alignment circuits, driving up to ten 74LS loads per tap.

For engineers reviewing the MXD1000PA025 datasheet, MXD1000PA025 pinout, MXD1000PA025 application, or MXD1000PA025 equivalent, key selection considerations include its 25ns nominal delay accuracy, 8-pin µMAX package footprint, temperature-stable unidirectional delay tracking, and compatibility with DS1000-series legacy designs.

Technical Context

The MXD1000PA025 implements a monolithic silicon delay architecture with five fixed, equally spaced taps referenced to a single input edge. All taps exhibit leading- and trailing-edge accuracy measured at 1.5V, with delay variation tightly coupled across temperature and supply voltage - if TAP1 slows, all other taps slow proportionally.

It operates from VCC = +4.75V to +5.25V, supports input pulse widths down to 20% of TAP5 delay (i.e., ≥5ns for this variant), and maintains functional integrity with input periods as short as 2×tWI. Delay variation due to supply is <4% over full VCC range; initial tolerance is ±2ns or ±5% at +25°C.

Key Specifications

Pinout & Package

The MXD1000PA025 is packaged in an 8-pin µMAX (8LUMAX) surface-mount package, measuring 3mm × 3mm × 0.8mm, with exposed pad for thermal enhancement and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar silicon delay line applications.

Compared with DS1000-25 and MXD1000SA025, the MXD1000PA025 uniquely combines industrial temperature range, µMAX packaging, and 20mA low-power operation - making it optimal for new industrial control and embedded instrumentation designs requiring long-term reliability and compact layout.

Availability

MXD1000PA025 is available at Aetrix Electronics and suitable for clock synchronization, digital signal alignment, and logic glitch suppression requiring stable component supply, guaranteed industrial temperature performance, and consistent µMAX footprint availability.

Supply support for MXD1000PA025 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) is a semiconductor company specializing in analog, mixed-signal, and high-reliability ICs for industrial, communications, and computing applications.

The MXD1000 product line was designed as a silicon-based replacement for hybrid delay lines - delivering improved accuracy, lower power, and smaller footprint for precision timing in digital systems.

FAQ

What is the exact nominal delay specification for the MXD1000PA025?

The MXD1000PA025 has a nominal TAP5 delay of 25ns, with TAP1–TAP4 positioned at 5ns, 10ns, 15ns, and 20ns respectively - all equally spaced at 20% increments of the 25ns base delay. This is confirmed in the "Part Number and Delay Times" table of the official Maxim datasheet, where "PA" denotes the -40°C to +85°C grade and "025" explicitly encodes the 25ns delay.

Does the MXD1000PA025 support both rising- and falling-edge delay accuracy?

Yes, the MXD1000PA025 specifies both tPLH (input-to-output rising edge delay) and tPHL (input-to-output falling edge delay) with identical ±2ns or ±5% tolerance. The datasheet's "Timing Characteristics" table and Figure 1 timing diagram confirm that accuracy is guaranteed for both edges at the 1.5V measurement threshold - essential for bidirectional or AC-coupled signal paths.

Can the MXD1000PA025 drive modern CMOS loads like 74LVC or 74AUC families?

Yes, the MXD1000PA025 can directly drive 74LVC and 74AUC inputs because its VOH/VOL levels (≥4.0V/≤0.5V at VCC = 4.75V) and output drive strength (±12mA sink/source) exceed the VIH/VIL thresholds and input current requirements of those families. Its TTL/CMOS-compatibility statement covers all standard 5V logic variants, including low-voltage CMOS when operated at 5V.

Is the 8-pin µMAX package of the MXD1000PA025 pin-compatible with the DS1000 series?

No - while the MXD1000PA025 µMAX pinout matches the 8-pin SO/DIP version of the DS1000 (IN, TAP1–TAP5, VCC, GND), the DS1000 does not offer a µMAX variant. The MXD1000PA025's µMAX pin mapping is identical to the MXD1000SE025 and MXD1000UA025, but differs from 14-pin or 16-pin DS1000 packages. Board-level compatibility requires matching the 8-pin configuration.

How does supply voltage variation affect delay stability in the MXD1000PA025?

Supply voltage variation affects MXD1000PA025 delay by less than 4% across the full VCC range (+4.75V to +5.25V), as stated in Note 10 of the datasheet. This translates to ≤1ns change for the 25ns nominal delay - significantly tighter than typical RC-based solutions. The device uses internal compensation to minimize VCC sensitivity, preserving timing integrity in systems with moderate rail ripple.