Analog Devices Inc./Maxim Integrated DS1100U-20+T&R

Overview

DS1100U-20+T&R from Maxim Integrated is a 5-tap silicon delay line in µMAX-8 package, delivering precisely spaced 4ns, 8ns, 12ns, 16ns, and 20ns delays at 5V supply, with ±2ns tolerance (≤40ns delays) over -40°C to +85°C, used for digital timing alignment in high-speed logic interfaces.

For engineers reviewing the DS1100U-20+T&R datasheet, DS1100U-20+T&R pinout, DS1100U-20+T&R application, or DS1100U-20+T&R equivalent, key selection criteria include tap delay precision, TTL/CMOS compatibility, 5V operation, industrial temperature range support, and µMAX-8 footprint constraints.

Technical Context

The DS1100U-20+T&R implements an all-silicon fixed-delay architecture with five equally spaced output taps, each reproducing both leading and trailing edges with equal accuracy. It operates exclusively at 5V (4.75V–5.25V), draws ≤50mA active current, and maintains delay stability across voltage and temperature variations.

Each tap drives up to 10 74LS loads, supports 20ns minimum input pulse width, and exhibits unidirectional delay drift-ensuring consistent relative timing between taps under varying conditions. Delay tolerances are specified as ±2ns (≤40ns) or ±5% (>40ns) at +25°C/5V.

Key Specifications

Pinout & Package

DS1100U-20+T&R uses the 8-pin µMAX® package (U8+1 outline, 3mm × 3mm body, 0.65mm pitch), with exposed pad for thermal enhancement and RoHS-compliant lead-free finish (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1100Z-20+ and DS1000S-20+, the DS1100U-20+T&R offers superior delay precision (±2ns), smaller µMAX-8 footprint, and full industrial temperature qualification - making it optimal for space-constrained, high-reliability timing alignment.

Availability

DS1100U-20+T&R is available at Aetrix Electronics and suitable for high-speed logic timing, glitch-free synchronization, digital signal integrity testing, and legacy system calibration requiring stable component supply and guaranteed industrial-temperature performance.

Supply support for DS1100U-20+T&R 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 timing solutions for industrial, communications, and computing markets.

The DS1100 series belongs to Maxim's economy timing element product line, designed specifically to replace hybrid delay lines with all-silicon alternatives offering improved precision, reliability, and manufacturability in surface-mount systems.

FAQ

What is the nominal delay sequence for DS1100U-20+T&R?

The DS1100U-20+T&R provides five equally spaced delays: TAP1 = 4ns, TAP2 = 8ns, TAP3 = 12ns, TAP4 = 16ns, and TAP5 = 20ns. These values are fixed and factory-trimmed; no external configuration is required. Each tap reproduces both rising and falling edges with identical delay, and all delays are specified over the full -40°C to +85°C operating range. The DS1100U-20+T&R achieves this using monolithic silicon delay circuitry, not RC networks or programmable logic.

Is DS1100U-20+T&R compatible with 3.3V logic systems?

No, DS1100U-20+T&R is strictly a 5V device, with VCC specified from 4.75V to 5.25V and input thresholds (VIH = 2.2V, VIL = 0.8V) optimized for 5V TTL/CMOS levels. It does not operate reliably at 3.3V supply or accept 3.3V logic inputs without level shifting. For 3.3V systems, consider alternative delay families such as the MAX962 or custom-designed solutions. The DS1100U-20+T&R's design assumes 5V rail integrity and decoupling per its test conditions.

How many 74LS loads can each tap of DS1100U-20+T&R drive?

Each tap of DS1100U-20+T&R can drive up to 10 standard 74LS logic inputs, based on its guaranteed output current specifications: IOL = 12mA (low-level sink) and IOH = -1mA (high-level source). This drive strength is verified under worst-case conditions (VCC = 4.75V, TA = +85°C) and aligns with the 74LS input loading model (IIL = -0.4mA, IIH = 20μA). Exceeding 10 loads may degrade delay accuracy and edge fidelity due to increased capacitive loading and voltage droop.

Does DS1100U-20+T&R require external components for stable operation?

Yes, DS1100U-20+T&R requires a minimum 0.1µF ceramic bypass capacitor placed as close as possible to the VCC and GND pins to suppress supply noise and ensure delay stability. No pull-up/pull-down resistors or termination networks are needed on input or tap outputs under standard 74LS loading. The DS1100U-20+T&R is designed for direct connection to CMOS/TTL inputs; however, impedance-matched routing is recommended for >50MHz input frequencies to prevent reflections that could affect measured delay accuracy.

What is the meaning of the "+T&R" suffix in DS1100U-20+T&R?

The "+T&R" suffix in DS1100U-20+T&R indicates two features: "+" denotes RoHS-compliant, lead(Pb)-free packaging, and "T&R" stands for tape-and-reel packaging format - specifically, 2500 units per reel, optimized for automated SMT placement. This format ensures ESD-safe handling, consistent orientation, and compatibility with pick-and-place machines. The DS1100U-20+T&R is not supplied in cut tape or tube variants under this ordering code; alternate formats (e.g., DS1100U-20+T) use the same die and specification but differ in packaging method.