Analog Devices Inc./Maxim Integrated DS1023S-500+

Overview

DS1023S-500+ from Maxim Integrated (formerly Dallas Semiconductor) is an 8-bit programmable silicon delay line configured for 5 ns step resolution, 1275 ns maximum delay in normal mode, and 10 MHz maximum input frequency. It supports three operating modes-delay line, pulse width modulator (PWM), and free-running oscillator-and features on-chip reference delay for full 0–360° clock phase control in telecom timing alignment and test instrumentation.

For engineers reviewing the DS1023S-500+ datasheet, DS1023S-500+ pinout, DS1023S-500+ application, or DS1023S-500+ equivalent, key selection considerations include its 5 ns step size, 50 ns minimum input pulse width, guaranteed monotonicity, parallel/serial programming interface, and SOIC-16 package compatibility with legacy DIP-16 footprints.

Technical Context

The DS1023S-500+ implements a digitally programmable tapped delay line architecture with internal gating for PWM generation and output inversion enabling oscillator configuration. Its reference delay (18–22 ns) cancels step-zero variation, allowing precise relative delay measurement referenced to REF/PWM rather than absolute IN-to-OUT timing.

Mode Select (MS) determines dual-output functionality: MS = 0 enables delayed non-inverted OUT and fixed-reference REF outputs; MS = 1 enables PWM output on REF/PWM and inverted delayed OUT. Programming uses either 8-bit parallel inputs (P0–P7) with latch enable (LE), or serial MSB-first loading via shared P1/CLK and P2/D pins.

Key Specifications

Pinout & Package

DS1023S-500+ is housed in a 300-mil 16-pin SOIC package (JEDEC MS-012), pin-compatible with DS1023 DIP-16 but with reduced footprint and thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1023-200+, the DS1023S-500+ trades step resolution and input frequency headroom for extended delay range and relaxed input pulse width requirements - making it preferable for industrial control timing, slower serial protocols, and calibration-grade phase adjustment where absolute delay span matters more than nanosecond granularity.

Availability

DS1023S-500+ is available at Aetrix Electronics and suitable for telecom infrastructure timing, automated test equipment, medical imaging pulse control, and industrial programmable logic applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for DS1023S-500+ 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 timing ICs for industrial, communications, and computing markets.

The DS1023S-500+ belongs to Maxim's programmable timing element family, engineered for applications demanding deterministic, software-adjustable delays with hardware-level reliability - especially where phase alignment, pulse shaping, or self-clocking are critical.

FAQ

What is the minimum input pulse width supported by the DS1023S-500+?

The DS1023S-500+ requires a minimum input pulse width of 50 ns for reliable operation in all modes. This specification ensures accurate delay registration and prevents metastability in the internal delay chain. Operating below 50 ns may result in degraded output voltage levels, missing pulses, or inconsistent delay behavior - particularly in PWM mode where narrow pulses fall below the 5 ns functional threshold. Always verify input waveform integrity with a 50 Ω source and ≤1 ns rise/fall times per the datasheet test conditions.

How does the reference delay (REF/PWM) improve timing accuracy in the DS1023S-500+?

The reference delay in the DS1023S-500+ is a trimmed 18–22 ns fixed delay that cancels out the device's inherent "step zero" variation (typically −2 to 0 ns). By measuring delay relative to REF instead of absolute IN-to-OUT timing, system-level errors from process, voltage, and temperature drift are suppressed. This allows the DS1023S-500+ to achieve true zero-relative delay calibration - essential for phase-critical applications like clock deskew where absolute delay stability is less important than consistent incremental adjustment.

Can the DS1023S-500+ generate a free-running oscillator, and how is it configured?

Yes, the DS1023S-500+ can operate as a free-running oscillator by configuring MS = 1 and externally connecting the OUT/OUT pin back to the IN pin. In this mode, the device outputs an inverted, delayed version of its own output, creating a ring oscillator whose period equals twice the programmed delay value. The resulting frequency ranges from 0.4 MHz (max delay) to 22 MHz (min delay), with actual output dependent on the step-zero delay and programmed value. No external components are needed beyond the feedback trace.

What is the difference between parallel and serial programming modes on the DS1023S-500+?

Parallel programming uses all eight P0–P7 pins to load the delay value simultaneously, controlled by LE and P/S; it offers fastest update speed and is ideal for static or infrequently changed settings. Serial programming shares P1/CLK and P2/D with parallel inputs and loads data MSB-first on CLK rising edges while LE remains high - enabling daisy-chaining of multiple DS1023S-500+ units with a single controller. Both modes retain the programmed value through power cycles, as the device uses volatile latching, not non-volatile memory.

Is the DS1023S-500+ pin-compatible with the through-hole DS1023-500+ DIP version?

Yes, the DS1023S-500+ in SOIC-16 is pin-for-pin compatible with the DS1023-500+ in 300-mil DIP-16 package - identical pin numbering, signal mapping, and electrical behavior. This allows direct drop-in replacement in existing layouts with only footprint adaptation required. Thermal performance differs (SOIC runs cooler), and board-level decoupling should follow SOIC layout best practices, but no schematic or firmware changes are needed when migrating from DIP to SOIC variants of the DS1023S-500+.