Analog Devices Inc./Maxim Integrated DS1033M-25

Overview

DS1033M-25 from Maxim Integrated (formerly Dallas Semiconductor) is a low-voltage, all-silicon 3-channel digital delay line operating at +3.3 V with ±25 ns nominal delay per output, ±2.0 ns initial tolerance, and stable performance across 0°C to +70°C and 2.7 V to 3.6 V supply range. It preserves input signal symmetry via precise leading/trailing edge accuracy and targets high-reliability timing-critical applications such as clock deskewing and signal alignment in logic systems.

For engineers reviewing the DS1033M-25 datasheet, DS1033M-25 pinout, DS1033M-25 application, or DS1033M-25 equivalent, key selection considerations include its fixed 25 ns per-output delay, DIP-8 package, 3.3 V operation, ±2.0 ns initial tolerance, and compatibility with TTL/CMOS logic families under industrial temperature conditions.

Technical Context

The DS1033M-25 implements three independent buffered delay paths in a single monolithic silicon IC, each delivering identical 25 ns propagation delay (tPLH/tPHL) with matched rise/fall time (2.0–3.5 ns). Its architecture eliminates analog drift and mechanical instability inherent in LC or SAW-based delay solutions.

It operates within a 2.7 V–3.6 V supply range, draws ≤25 mA active current at 3.6 V, and maintains delay stability over voltage and temperature-±2.0 ns over temperature/voltage at VCC = 3.3 V and ±3.5 ns at VCC = 2.7 V-enabling robust use in noise-sensitive digital timing paths without recalibration.

Key Specifications

Pinout & Package

DS1033M-25 uses an 8-pin plastic dual in-line package (PDIP), 300-mil width, with standard through-hole mounting. Pin 1 is marked by a notch or dot; substrate pins (Sub) are internally connected and must remain unconnected externally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1033Z-25, the DS1033M-25 offers identical timing performance in a through-hole package for prototyping or legacy board upgrades; compared with MC100EP195DG, it trades programmability and speed for simplicity, cost, and 3.3 V CMOS/TTL compatibility in fixed-delay logic alignment tasks.

Availability

DS1033M-25 is available at Aetrix Electronics and suitable for logic signal deskewing, high-speed bus timing alignment, and test equipment pulse shaping requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production lots.

Supply support for DS1033M-25 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 (acquired Dallas Semiconductor in 2001) is a U.S.-based semiconductor company specializing in analog, mixed-signal, and timing solutions for industrial, communications, and computing markets.

The DS1033 series was designed as a reliable, all-silicon replacement for older mercury-delay-line and LC-based timing circuits, targeting fixed-delay applications in commercial-grade digital systems where stability, small size, and solder-process compatibility are critical.

FAQ

What is the exact delay value and tolerance specification for DS1033M-25?

The DS1033M-25 provides a nominal 25 ns propagation delay (tPLH and tPHL) on each of its three independent output channels. Its initial delay tolerance is ±2.0 ns at +25°C and VCC = 3.3 V. Over the full operating temperature range (0°C to +70°C) and supply voltage range (2.7 V to 3.6 V), the total delay variation is ±2.0 ns at VCC = 3.3 V and ±3.5 ns at VCC = 2.7 V, as specified in Table 1 of the DS1033 datasheet.

Is DS1033M-25 compatible with 5 V logic systems?

No, DS1033M-25 is strictly a +3.3 V device characterized for operation between 2.7 V and 3.6 V. It is not rated for 5 V operation, and applying 5 V to VCC exceeds its absolute maximum rating of +6.0 V only as a non-operational stress limit. For 5 V systems, consider alternatives like the MC100EP195DG or discrete delay solutions-not DS1033M-25.

Can unused inputs or outputs on DS1033M-25 be left floating?

No. Unused inputs (IN1–IN3) must be tied to a valid logic level-either VCC or GND-to prevent metastability and excessive current draw. Unused outputs (OUT1–OUT3) may be left open, but best practice is to terminate them with appropriate logic loads if driving transmission lines. The NC and Sub pins must remain unconnected per datasheet instruction.

Does DS1033M-25 support hot-swap or power sequencing requirements?

DS1033M-25 has no built-in hot-swap protection or power-on reset circuitry. Its power-up time (tPU) is 100 ms, during which outputs are undefined. For systems requiring controlled power sequencing, ensure VCC ramps monotonically and that input signals remain inactive until after tPU elapses. Decoupling (0.1 µF ceramic + 10 µF bulk) near VCC/GND is mandatory.

What is the recommended PCB layout practice for DS1033M-25 to maintain timing accuracy?

To preserve DS1033M-25's ±2.0 ns delay accuracy, minimize trace inductance and capacitance on INx/OUTx paths: keep input/output traces short and matched in length, avoid stubs or vias near pins, place 0.1 µF ceramic decoupling capacitor within 5 mm of VCC/GND pins, and route GND beneath the device with solid plane coverage. Avoid routing noisy signals (e.g., clocks, switching regulators) adjacent to delay paths.