Analog Devices Inc./Maxim Integrated DS1023S-25+T

Overview

DS1023S-25+T from Maxim Integrated (formerly Dallas Semiconductor) is an 8-bit programmable silicon delay line configured for 0.25 ns step resolution, supporting delay ranges up to 63.75 ns with ±1 ns integral non-linearity, full-period clock phase adjustment, and on-chip reference delay compensation - used in high-precision clock alignment, jitter reduction, and pulse width modulation within test instrumentation and digital timing systems.

For engineers reviewing the DS1023S-25+T datasheet, DS1023S-25+T pinout, DS1023S-25+T application, or DS1023S-25+T equivalent, this page delivers verified timing parameters, mode-select behavior (delay line/PWM/oscillator), serial/parallel programming interface timing, absolute vs. reference-referenced delay accuracy, and SOIC-16 package implementation guidance.

Technical Context

The DS1023S-25+T implements a CMOS-based tapped delay line architecture with internal trimming to ensure tREF ≈ tD0 + 1.5 ns, enabling true 0°–360° clock phase control via programmable delay relative to the REF output. Its dual-output configuration (OUT and REF/PWM) is controlled by the MS pin, allowing selection between normal delayed output, inverted delayed output, or rising-edge-triggered PWM.

It supports two mutually exclusive programming modes: parallel (P/S = 0, 8-bit bus via P0–P7, latched by LE) and serial (P/S = 1, MSB-first shift-in via D/P2 and CLK/P1, with Q/P0 as data-out). Unused parallel inputs P3–P7 must be tied to defined logic levels; Q/P0 may float when unused.

Key Specifications

Pinout & Package

DS1023S-25+T is supplied in a 16-pin 300-mil SOIC package (JEDEC MS-012AC), pin-compatible with the DS1023 DIP variant but with surface-mount footprint and thermal profile optimized for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1023-25+ (DIP), DS1023S-25+T offers identical timing performance in surface-mount form for automated production, while MAX9622EUA+ trades integrated functionality for finer resolution in narrow-range analog delay applications.

Availability

DS1023S-25+T is available at Aetrix Electronics and suitable for test instrumentation calibration, digital clock deskew, PWM generation, and oscillator synthesis requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for DS1023S-25+T 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 and mixed-signal ICs for timing, power, sensing, and communication applications.

The DS1023 product line delivers programmable silicon delay elements targeting high-accuracy timing control in test equipment, communications infrastructure, and digital system synchronization - emphasizing on-chip reference compensation and multi-mode configurability.

FAQ

What is the minimum usable pulse width for DS1023S-25+T in PWM mode?

The DS1023S-25+T specifies a minimum reliable PWM output pulse width of 5 ns. Programmed values below this threshold may cause degraded high-level voltage or complete loss of output pulse due to internal response limits. This value is independent of input pulse width, which itself must be ≥20 ns for correct operation. The 5 ns limit is derived from device characterization under standard test conditions (VCC = 5 V, TA = 25°C) and applies across the full commercial temperature range.

How does the REF output function in DS1023S-25+T delay calibration?

The REF output in DS1023S-25+T provides a fixed ~18–22 ns delay tightly trimmed to exceed the step zero delay (tD0) by ~1.5 ns. When measuring delay relative to REF instead of ground-referenced IN, the DS1023S-25+T achieves true zero-offset programmability - enabling accurate phase alignment over 0°–360° without external calibration. This eliminates process- and temperature-induced variations in tD0, making REF the recommended reference for high-accuracy timing applications.

Can DS1023S-25+T operate as a free-running oscillator, and what determines its frequency?

Yes, DS1023S-25+T can operate as a free-running oscillator by externally connecting the OUT pin to the IN pin while setting MS = 1. In this configuration, the output frequency is determined solely by the programmed delay value tD: fOSC = 1 / (2 × tD). For DS1023S-25+T, this yields a tunable range of 6.6 MHz (minimum, at tD = 75 ns) to 22 MHz (maximum, at tD = 22.7 ns), with step resolution of 0.5 ns in oscillator period. Startup is guaranteed after power-up time (tPU = 100 ms).

What are the critical layout requirements for DS1023S-25+T to maintain 0.25 ns timing accuracy?

To preserve DS1023S-25+T's 0.25 ns step resolution, layout must minimize noise coupling and signal integrity degradation: VCC requires a 0.1 µF ceramic capacitor placed ≤2 mm from the pin; GND connection must be low-inductance with solid plane beneath the SOIC; input and output traces should be impedance-controlled (50 Ω) and length-matched if used differentially; unused parallel inputs P3–P7 must be tied to VCC or GND with short traces (<5 mm); and REF/OUT routing must avoid crosstalk with clocks or switching nodes.

Is DS1023S-25+T pin-compatible with earlier DS1020/DS1021 devices?

No, DS1023S-25+T is not pin-compatible with DS1020 or DS1021. Although programming logic is similar, DS1023S-25+T repurposes P0/Q, P1/CLK, and P2/D as dual-function pins (parallel I/O + serial I/O), whereas DS1020/DS1021 use dedicated serial pins. Additionally, DS1023S-25+T adds MS and REF/PWM functionality absent in DS1020/DS1021. Board-level replacement requires schematic and layout revision.