Analog Devices Inc./Maxim Integrated DS1100U-20+

Overview

DS1100U-20+ from Maxim Integrated is a 5-tap silicon delay line IC providing fixed, equally spaced delays of 4ns, 8ns, 12ns, 16ns, and 20ns at each tap, operating at 5V with ±4ns delay tolerance over -40°C to +85°C, and capable of driving up to 10 74LS loads per tap - used in digital timing alignment, clock skew correction, and pulse-width adjustment circuits.

For engineers reviewing the DS1100U-20+ datasheet, DS1100U-20+ pinout, DS1100U-20+ application, or DS1100U-20+ equivalent, key selection factors include tap delay precision across temperature, TTL/CMOS compatibility, µMAX package footprint, low-power CMOS operation, and leading/trailing edge fidelity for high-speed logic synchronization.

Technical Context

The DS1100U-20+ implements an all-silicon delay architecture with five discrete, equally spaced output taps derived from a single input signal, reproducing both rising and falling edges with matched propagation delay. It requires no external components and operates without configuration registers or control interfaces.

Delay values are factory-trimmed and specified as nominal values at +25°C/5V, with absolute tolerances (±4ns for ≤40ns delays) and relative percentage tolerances (±13% for >40ns delays) over full industrial temperature range. Each tap delivers consistent edge-to-edge timing behavior under varying VCC (4.75V–5.25V) and load conditions.

Key Specifications

Pinout & Package

DS1100U-20+ uses the 8-pin µMAX® package (U8+1 outline), measuring 3.0mm × 3.0mm × 0.8mm with exposed pad, optimized for high-density PCB layouts and compatible with vapor-phase, IR, and wave soldering processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1100Z-20+, the DS1100U-20+ saves 60% board area with its 3mm × 3mm µMAX package while maintaining identical timing performance; versus DS1000S-20+, it delivers superior stability, tighter delay tolerance, and full industrial temperature support - making it the preferred choice for new designs requiring reliability and miniaturization.

Availability

DS1100U-20+ is available at Aetrix Electronics and suitable for digital timing alignment, pulse-width modulation, and industrial logic synchronization requiring stable component supply, RoHS compliance, and µMAX footprint compatibility.

Supply support for DS1100U-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) is a semiconductor company specializing in precision analog, mixed-signal, and timing solutions for industrial, communications, and computing applications.

The DS1100 series was designed as a low-cost, high-reliability silicon replacement for hybrid delay lines, targeting timing-critical logic interfaces where stability, small size, and ease of integration are essential.

FAQ

What is the exact delay value at TAP 3 for DS1100U-20+?

The DS1100U-20+ delivers a nominal delay of 12ns at TAP 3, with a maximum tolerance of ±4ns over the full -40°C to +85°C operating temperature range. This value is factory-trimmed and specified in Table 1 of the official Maxim datasheet (19-5735 Rev 3/11). The delay remains monotonic across all taps, meaning TAP 3 is always exactly 3× the TAP 1 delay (4ns) under all valid operating conditions.

Does DS1100U-20+ support both rising and falling edge delays with equal accuracy?

Yes, DS1100U-20+ is explicitly designed to reproduce both leading and trailing edges with equal precision. Its tPLH (rising-edge delay) and tPHL (falling-edge delay) are matched within ±4ns across temperature and voltage, as confirmed in the AC Electrical Characteristics table and General Description section. This symmetry ensures accurate pulse-width preservation when using multiple taps for logic operations.

Can DS1100U-20+ drive standard TTL loads directly?

Yes, DS1100U-20+ can drive up to 10 standard 74LS loads per tap, as stated in the General Description. Its IOL of 12mA and IOH of -1mA meet the DC interface requirements of 74LS inputs (IIL = -0.4mA, IIH = 20µA), eliminating the need for buffer amplifiers in most logic-level timing applications.

Is DS1100U-20+ pin-compatible with DS1100Z-20+?

No, DS1100U-20+ and DS1100Z-20+ share identical pin functions but differ in physical package: DS1100U-20+ uses the 8-pin µMAX (U8+1) outline, while DS1100Z-20+ uses the 8-pin SO (S8+4) package. Their land patterns and mounting requirements are incompatible - PCB layout must be redesigned to switch between them.

What is the maximum input frequency supported by DS1100U-20+?

The DS1100U-20+ does not specify a hard maximum input frequency, but the datasheet states that frequencies above 1MHz increase ICC and may reduce delay accuracy due to layout sensitivity and decoupling. For reliable operation with guaranteed ±4ns tolerance, input periods should exceed 1µs (i.e., ≤1MHz), as validated in the Test Conditions section using 1µs period waveforms.