Analog Devices Inc./Maxim Integrated DS1020S-25+

Overview

DS1020S-25+ from Maxim Integrated (formerly Dallas Semiconductor) is a programmable 8-bit silicon delay line IC with 0.25 ns step resolution, 73.75 ns maximum delay, ±6 ns max deviation, TTL/CMOS-compatible I/O, and dual programming interfaces (3-wire serial or 8-bit parallel). It delivers precise edge-aligned timing in high-speed digital test and synchronization circuits.

For engineers reviewing the DS1020S-25+ datasheet, DS1020S-25+ pinout, DS1020S-25+ application, or DS1020S-25+ equivalent, key selection factors include its 0.25 ns incremental delay accuracy, 50 µs enable-to-delay settling time, dual-mode programmability, SOIC-16 surface-mount package, and non-inverting output behavior across rising/falling edges.

Technical Context

The DS1020S-25+ implements an all-CMOS, user-programmable 8-bit delay register that reproduces input logic states at the output after a digitally set delay-without inversion. Its architecture supports both latched and non-latched parallel programming and daisy-chainable serial programming with MSB-first shifting and destructive readback capability.

It operates at 5.0 V ±5%, features 10 ns inherent (step-zero) delay, and guarantees leading/trailing edge accuracy per Table 1 specifications. Timing validation is performed using IEEE 488-controlled automated test setups with 20 ps resolution time interval analyzers under defined pulse width and period constraints per model.

Key Specifications

Pinout & Package

DS1020S-25+ is supplied 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 DS1020-25+ and DS1023S-25+, the DS1020S-25+ provides identical delay performance and SOIC-16 form factor but requires external host control for every delay update-making it optimal for dynamically reconfigurable test systems where flexibility outweighs nonvolatility.

Availability

DS1020S-25+ is available at Aetrix Electronics and suitable for high-speed logic test equipment, digital signal integrity validation, and programmable clock alignment requiring stable component supply and long-term obsolescence management.

Supply support for DS1020S-25+ 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 high-reliability timing solutions.

The DS1020S-25+ belongs to Maxim's legacy programmable delay line family, designed specifically for deterministic timing adjustment in digital test, instrumentation, and logic interface compensation applications.

FAQ

What is the inherent delay of DS1020S-25+ when programmed to zero steps?

The DS1020S-25+ has a fixed step-zero delay of 10 ±2 ns, which is present regardless of programming state. This base latency is consistent across all DS1020 variants and represents the minimum propagation time from IN to OUT. The DS1020S-25+ adds 0.25 ns per increment up to 73.75 ns maximum, making it ideal for applications needing tight control over absolute delay floors.

Does DS1020S-25+ support both rising and falling edge delay accuracy?

Yes, DS1020S-25+ guarantees matching delay values for both rising (tPLH) and falling (tPHL) edges within ±6 ns maximum deviation, as verified per Table 1 and Figure 5 timing diagrams. This edge-symmetry is essential for bidirectional data strobes and clock forwarding applications where duty cycle integrity must be preserved. The DS1020S-25+ achieves this via matched internal CMOS paths and calibrated output drivers.

Can DS1020S-25+ be daisy-chained for multi-device programming?

Yes, DS1020S-25+ supports serial daisy-chaining: connect Q of one device to D of the next, with shared C and E lines. Each device shifts out its prior register content while loading new data, enabling synchronized programming of multiple units with a single controller. The DS1020S-25+ requires eight clock cycles per device, MSB-first, and uses a 1 kΩ–10 kΩ pull-up resistor for destructive readback restoration.

What is the maximum clock frequency supported for serial programming of DS1020S-25+?

The DS1020S-25+ supports serial clock frequencies up to 10 MHz, with minimum tCW (clock width) and tDSC (data setup) of 50 ns and 30 ns respectively. This allows reliable programming at 10 MHz in commercial temperature range (0°C to +70°C) with 5.0 V ±5% supply. The DS1020S-25+ serial interface is not intended for continuous high-speed streaming but for infrequent or initialization-time delay updates.

Is DS1020S-25+ pin-compatible with DS1020-25+?

Yes, DS1020S-25+ and DS1020-25+ share identical pin functions and 16-pin numbering, differing only in package type: SOIC-16 versus DIP-16. Mechanical dimensions and soldering profiles differ, but PCB layout for the SOIC variant can be adapted from DIP footprints with minor pad adjustments. All electrical characteristics, timing parameters, and programming behavior are identical between the two packages of DS1020S-25+ and DS1020-25+.