Analog Devices Inc./Maxim Integrated DS1100LU-20+

Overview

DS1100LU-20+ from Maxim Integrated is a 3.3V, 5-tap silicon delay line in an 8-pin µMAX package, delivering precise fixed delays of 4ns, 8ns, 12ns, 16ns, and 20ns across taps. It reproduces both leading and trailing edges with ±4ns tolerance over –40°C to +85°C, drives up to 10 LS-TTL loads per tap, and operates with 3.0V–3.6V supply. It is used in high-speed timing alignment for test equipment and digital signal synchronization.

For engineers reviewing the DS1100LU-20+ datasheet, DS1100LU-20+ pinout, DS1100LU-20+ application, or DS1100LU-20+ equivalent, key selection criteria include tap delay accuracy over temperature, edge fidelity for pulse shaping, drive strength per output, and µMAX footprint compatibility in space-constrained PCB layouts.

Technical Context

The DS1100LU-20+ implements a monolithic all-silicon delay architecture-no hybrid or ceramic components-ensuring stable propagation delay independent of aging or thermal hysteresis. Each of its five equally spaced taps provides deterministic, non-programmable delay with matched rise/fall time (2.0–2.5ns) and identical input-to-output edge precision.

It functions as a passive timing element: input logic state is replicated at each tap after a fixed interval, with no internal clock, PLL, or feedback. Delay values are factory-trimmed and specified at 3.3V/25°C, with tolerances scaling by ±4ns (≤40ns delays) or ±13% (>40ns) across –40°C to +85°C.

Key Specifications

Pinout & Package

DS1100LU-20+ uses the 8-pin µMAX package (U8+1 outline), 3mm × 3mm body, 0.65mm pitch, exposed pad for thermal enhancement. Pin 1 is IN; pins 2–5 are TAP 2 through TAP 5; pin 6 is TAP 3; pin 7 is TAP 1; pin 8 is VCC; pin 4 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1000LZ-20+ and MC100EP195DG, the DS1100LU-20+ uniquely delivers five simultaneous, precisely matched fixed delays in a miniature µMAX package-ideal for compact, production-ready timing alignment where tap count and board area are constrained.

Availability

DS1100LU-20+ is available at Aetrix Electronics and suitable for digital test equipment timing calibration, high-speed data path deskew, logic analyzer probe deskewing, and LVDS clock distribution buffering requiring stable component supply and guaranteed industrial-temperature performance.

Supply support for DS1100LU-20+ 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 power management ICs for industrial, communications, and computing applications.

The DS1100L series was developed as an economy-grade silicon delay line family targeting cost-sensitive, high-volume timing alignment tasks-replacing hybrid delay modules with fully integrated, RoHS-compliant alternatives.

FAQ

What is the maximum operating frequency supported by DS1100LU-20+?

The DS1100LU-20+ does not have a defined maximum operating frequency-it is a passive delay element whose usable input edge rate depends on rise/fall time and layout. With 2.0–2.5ns output transitions and 5pF input capacitance, it reliably supports input signals with >200MHz fundamental content when properly decoupled and routed. The DS1100LU-20+ datasheet specifies test conditions up to 1MHz for ICC measurement, but actual high-speed use is limited only by external signal integrity.

Does DS1100LU-20+ require external configuration or programming?

No, the DS1100LU-20+ is a fully static, unprogrammable device. Its five delay values (4ns, 8ns, 12ns, 16ns, 20ns) are factory-trimmed and permanently fixed. No external resistors, capacitors, or digital interface are needed-only VCC, GND, and the input signal must be connected. The DS1100LU-20+ operates immediately upon power-up with zero initialization latency.

Can DS1100LU-20+ drive 50Ω transmission lines directly?

No, the DS1100LU-20+ is not designed for direct 50Ω line driving. Its output drive strength (8mA sink / –1mA source) targets 74LS logic loads (≈400Ω), not 50Ω impedance. For 50Ω systems, a dedicated line driver (e.g., MAX9110) or series termination must be used. Driving 50Ω loads directly would degrade edge fidelity and exceed output current limits, risking timing inaccuracy in the DS1100LU-20+.

How does DS1100LU-20+ handle power-up timing stability?

The DS1100LU-20+ features a 200μs power-up time (tPU), after which all taps deliver stable, specification-compliant delays. During this interval, outputs remain in a high-impedance or indeterminate state-no glitching or metastability occurs. This behavior ensures clean startup in systems where DS1100LU-20+ is powered synchronously with other logic, avoiding false triggers in timing-critical test sequencers.

Is the exposed pad on the DS1100LU-20+ µMAX package electrically connected?

Yes, the exposed thermal pad on the DS1100LU-20+ µMAX package is internally connected to GND. It must be soldered to a PCB thermal pad tied to the system ground plane to ensure proper heat dissipation and electrical stability. Leaving the pad floating degrades thermal performance and may cause parametric shift under sustained load-this requirement is documented in Maxim's U8+1 land pattern (90-0092).