Analog Devices Inc./Maxim Integrated DS1020S-100

Overview

DS1020S-100 from Dallas Semiconductor (now Maxim Integrated) is a programmable 8-bit silicon delay line IC used for precise digital signal timing control in high-speed logic systems. It delivers a nominal step-zero delay of 10 ns, maximum delay of 265 ns, and 1 ns per step resolution across 256 programmable values. It supports both 3-wire serial and 8-bit parallel programming, operates at 5 V, and maintains edge accuracy on rising and falling transitions - ideal for clock deskewing, pulse width adjustment, and setup/hold time compensation.

For engineers reviewing the DS1020S-100 datasheet, DS1020S-100 pinout, DS1020S-100 application, or DS1020S-100 equivalent, key selection criteria include its 1 ns incremental delay step, dual-programming interface flexibility, TTL/CMOS compatibility, SOIC-16 surface-mount package, and guaranteed ±20 ns max deviation from programmed delay under industrial temperature range (0°C to 70°C).

Technical Context

The DS1020S-100 implements an all-CMOS, user-programmable delay path with no analog components or external capacitors. Its internal 8-bit register controls delay via either parallel (P0–P7) or serial (D/C/Q/E/S) inputs, with mode selection via S pin. The device reproduces input logic state at OUT without inversion after the programmed delay.

It features dual-edge accuracy (tPLH/tPHL matched), supports daisy-chained serial configuration, and requires no external components for operation. Unused pins must be tied to defined logic levels due to CMOS input structure, and settling time tEDV = 50 µs applies after any delay reprogramming.

Key Specifications

Pinout & Package

DS1020S-100 is housed in a 16-pin SOIC (300-mil) surface-mount package, pin-compatible with the DIP variant but optimized for automated assembly and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1020-100 and MAX9622, the DS1020S-100 uniquely combines surface-mount SOIC packaging, full 256-step programmability, and dual-interface flexibility - making it the only option supporting field-updatable, precision delay in space-constrained, high-density digital systems.

Availability

DS1020S-100 is available at Aetrix Electronics and suitable for logic timing calibration, test equipment signal alignment, pulse width modulation refinement, and digital signal integrity enhancement requiring stable component supply and long-term lifecycle support.

Supply support for DS1020S-100 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

Dallas Semiconductor, acquired by Maxim Integrated in 2001, specialized in precision analog, timing, and secure memory ICs for industrial and communications applications.

The DS1020 product line was designed to replace hybrid delay modules with fully integrated, programmable silicon solutions - targeting high-reliability digital systems needing repeatable, temperature-stable nanosecond-level timing control.

FAQ

What is the nominal delay range of the DS1020S-100?

The DS1020S-100 provides a step-zero delay of 10 ± 2 ns and a maximum programmable delay of 265 ns in 1 ns increments across 256 steps. This range is confirmed in Table 1 of the official datasheet and applies across the full operating temperature range (0°C to 70°C) with ±20 ns maximum deviation from the programmed value.

Does the DS1020S-100 support both rising and falling edge delay accuracy?

Yes, the DS1020S-100 guarantees matched delay performance on both signal edges: tPLH (rising) and tPHL (falling) are specified identically in Table 2 and validated per test condition notes. This dual-edge accuracy is essential for applications like clock deskewing and pulse shaping where symmetry matters.

Can the DS1020S-100 be programmed dynamically during system operation?

Yes - the DS1020S-100 supports real-time reprogramming via its 3-wire serial interface (C/D/Q/E/S pins). After issuing a new 8-bit value, a 50 µs settling time (tEDV) is required before the updated delay becomes valid. This enables adaptive timing adjustments in response to environmental or operational changes.

What is the function of the Q pin on the DS1020S-100?

The Q pin serves as serial data output in serial mode and doubles as P0 (LSB) in parallel mode. It outputs the MSB-first contents of the internal 8-bit delay register during serial read operations. Per datasheet Note 4, Q is rated for 4 mA source current and is intended solely to drive other DS1020 devices - not general-purpose logic.

Is the DS1020S-100 pin-compatible with the DS1020-100?

Yes - the DS1020S-100 and DS1020-100 share identical pin numbering, signal definitions, and electrical behavior. The only difference is package type: SOIC-16 vs. DIP-16. No PCB layout changes are needed when migrating between them, though soldering profiles and mechanical clearances differ.