Analog Devices Inc./Maxim Integrated DS1005M-250+

Overview

DS1005M-250+ from Maxim Integrated (formerly Dallas Semiconductor) is a 5-tap all-silicon delay line with fixed tap delays of 50 ns, 100 ns, 150 ns, 200 ns, and 250 ns; ±2 ns or ±3% delay tolerance; TTL/CMOS-compatible input; and capable of driving ten 74LS loads per tap. It is used in digital timing alignment, clock skew correction, and pulse width adjustment in test instrumentation and industrial control systems.

For engineers reviewing the DS1005M-250+ datasheet, DS1005M-250+ pinout, DS1005M-250+ application, or DS1005M-250+ equivalent, key selection criteria include leading/trailing edge delay accuracy, temperature/voltage stability across 0°C to 70°C, 5.0 V ±5% supply operation, 8-pin DIP package compatibility, and tap output drive strength for logic interfacing.

Technical Context

The DS1005M-250+ implements a monolithic silicon delay line architecture-no external capacitors or inductors-ensuring deterministic propagation delay independent of board layout parasitics. All five taps reproduce the input logic level with matched edge fidelity: tPLH and tPHL are both specified per Table 1 and exhibit unidirectional drift with temperature/voltage variation.

It operates exclusively at VCC = 5.0 V ±5% with VIH ≥ 2.2 V and VIL ≤ 0.8 V, and supports full-rail input transitions with 3 ns max rise/fall time. Each tap delivers IOL = 12 mA and IOH = –1.0 mA into 74LS-equivalent loads, enabling direct fanout without buffering.

Key Specifications

Pinout & Package

DS1005M-250+ is supplied in an 8-pin DIP (300-mil) package with gull-wing leads, optimized for through-hole auto-insertion and wave soldering. Pin 1 is IN; pins 2–3 and 5–6 are TAP 2, TAP 4, TAP 1, TAP 3, and TAP 5 respectively; pin 4 is GND; pin 7 is VCC; pin 8 is unused (NC).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-tap delay line applications.

Compared with DS1005-250+ and DS1005S-250+, the DS1005M-250+ uniquely balances compact through-hole packaging, proven wave-solder reliability, and direct pin compatibility with existing 8-pin DIP footprints-making it optimal for field-serviceable industrial controllers and lab-grade instrumentation.

Availability

DS1005M-250+ is available at Aetrix Electronics and suitable for digital test equipment, industrial PLC timing, communications signal conditioning, and legacy system interfacing requiring stable component supply and long-term obsolescence management.

Supply support for DS1005M-250+ 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 by Analog Devices in 2021) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and timing solutions for industrial, communications, and computing markets.

The DS1005M-250+ belongs to Maxim's legacy silicon delay line product line, designed specifically to replace aging hybrid delay modules with monolithic, testable, and solder-process-robust alternatives for commercial-temperature timing-critical systems.

FAQ

What is the exact delay value for each tap on the DS1005M-250+?

The DS1005M-250+ provides five fixed, equally spaced delays: TAP 1 = 50 ns, TAP 2 = 100 ns, TAP 3 = 150 ns, TAP 4 = 200 ns, and TAP 5 = 250 ns. These values are measured at the 1.5 V threshold for both rising (tPLH) and falling (tPHL) edges, with accuracy guaranteed to ±2 ns or ±3%, whichever is greater, across 0°C to 70°C and 4.75 V to 5.25 V.

Is the DS1005M-250+ pin-compatible with other DS1005 variants?

No-the DS1005M-250+ uses an 8-pin DIP pinout distinct from the 14-pin DIP (DS1005-250+) and 16-pin SOIC (DS1005S-250+) variants. Pin assignments differ: DS1005M-250+ places TAP 1 and TAP 3 on pins 5 and 6, whereas the 14-pin version locates them on pins 13 and 12. Direct substitution requires PCB layout revision.

Can the DS1005M-250+ drive modern CMOS loads like 74HC or 74AHC series?

Yes-the DS1005M-250+ outputs meet TTL/CMOS voltage thresholds (VOH ≥ 4.0 V, VOL ≤ 0.5 V at IOL = 12 mA) and deliver sufficient current to drive 74HC inputs (typ. 1 µA leakage) with margin. For 74AHC, verify load capacitance does not exceed 10 pF per tap, as CIN is 5–10 pF and total driven capacitance affects edge fidelity.

Does the DS1005M-250+ require external decoupling capacitors?

Yes-a 0.1 µF ceramic capacitor must be placed as close as possible between VCC (pin 7) and GND (pin 4) to suppress supply noise-induced jitter. The DS1005M-250+'s delay stability depends on clean 5 V rail regulation; failure to decouple may cause delay variation exceeding ±2 ns, especially during simultaneous tap switching.

What is the maximum input pulse width the DS1005M-250+ supports?

The DS1005M-250+ has no hard upper limit on input pulse width, but AC specifications are validated for tWI ≥ 40% of Tap 5 tPLH (i.e., ≥100 ns). Pulses narrower than 40 ns may still function but fall outside guaranteed timing accuracy; pulses wider than 1 µs are fully supported and commonly used in static delay applications such as enable signal stretching.