Analog Devices Inc./Maxim Integrated DS1023-100

Overview

DS1023-100 from Maxim Integrated (formerly Dallas Semiconductor) is an 8-bit programmable silicon delay line with 1 ns step resolution, 255 ns maximum delay in normal mode, and ±4 ns integral non-linearity. It supports parallel/serial programming, on-chip reference delay compensation, and configurable output modes including delayed output, pulse-width modulation, and free-running oscillator. Used for clock phase alignment in digital test equipment and FPGA timing calibration.

For engineers reviewing the DS1023-100 datasheet, DS1023-100 pinout, DS1023-100 application, or DS1023-100 equivalent, this page delivers verified electrical specs, real-world timing behavior, mode-select logic implications, and validated alternative options for precision programmable delay requirements.

Technical Context

The DS1023-100 implements a digitally controlled analog delay path using switched-capacitor or tapped-delay-line architecture, trimmed to deliver 1 ns nominal step size with monotonic response. Its internal reference delay (18–22 ns) cancels step-zero offset, enabling true 0–360° clock phase control relative to input.

Mode Select (MS) pin configures dual-output functionality: MS = 0 enables REF (fixed reference delay) and OUT (programmable non-inverting delay); MS = 1 enables PWM (rising-edge triggered pulse width modulator) and inverted OUT for oscillator use. Serial interface shares pins P0/Q, P1/CLK, and P2/D, requiring careful bus isolation during programming.

Key Specifications

Pinout & Package

DS1023-100 is supplied in 16-pin 300-mil DIP (dual in-line package) or SOIC (small outline IC) packages. Both share identical pinout and electrical characteristics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1023-50 and DS1023-200, the DS1023-100 provides the most widely applicable trade-off: sufficient 255 ns range for 25 MHz clock alignment while retaining 1 ns resolution for fine-grained phase control-making it the default choice for general-purpose programmable delay in commercial digital systems.

Availability

DS1023-100 is available at Aetrix Electronics and suitable for digital test equipment, FPGA timing calibration, phase-locked loop support, and industrial PWM generation requiring stable component supply and long-term obsolescence management.

Supply support for DS1023-100 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

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, communications, and computing applications.

The DS1023 product line was developed by Dallas Semiconductor (acquired by Maxim in 2001) to provide monolithic, digitally programmable delay elements for clock alignment, phase control, and timing calibration in digital systems.

FAQ

What is the minimum input pulse width supported by DS1023-100?

The DS1023-100 requires a minimum input pulse width of 20 ns under standard operating conditions (0°C to +70°C, VCC = 5V ±5%). This specification ensures reliable internal sampling and delay path activation. Violating this limit may cause erratic output behavior or failure to register input transitions. The DS1023-100 datasheet explicitly defines tWI = 20 ns as the lower bound for guaranteed operation, independent of programming mode or output configuration.

Can DS1023-100 generate a free-running oscillator, and how is it configured?

Yes, the DS1023-100 can operate as a free-running oscillator by connecting its OUT pin to the IN pin externally while configuring MS = 1 and P/S = 0 or 1. In this mode, the device outputs an inverted, delayed version of its own output, creating sustained oscillation. The output frequency depends on the programmed delay value and step-zero delay, ranging from 1.9 MHz (minimum) to 22 MHz (maximum) per the DS1023-100 oscillator table. No additional components beyond the feedback connection are required.

How does the reference delay (REF) output improve timing accuracy in DS1023-100?

The REF output in DS1023-100 provides a fixed 18–22 ns delay that is factory-trimmed to closely match the device's inherent step-zero delay. By measuring delay relative to REF instead of absolute IN→OUT time, system-level variations caused by input voltage, transition time, and process temperature drift are canceled. This allows DS1023-100 to achieve true zero-relative delay settings and improves phase accuracy in clock alignment applications where repeatability matters more than absolute delay value.

What are the key timing constraints for serial programming of DS1023-100?

Serial programming of DS1023-100 requires tDSC ≥30 ns data setup before CLK rising edge, tDHC = 0 ns hold time, and LE held high during data shifting. Data loads MSB-first; eight bits must be clocked in sequence. After final CLK edge, LE must go low to activate the new delay value, followed by tEDV = 500 ns settling time before accurate delay is achieved. These constraints are defined in the DS1023-100 AC Electrical Characteristics table and apply identically across all speed variants.

Is DS1023-100 pin-compatible with DS1023-50 or DS1023-200?

Yes, DS1023-100 is fully pin-compatible with DS1023-50 and DS1023-200 - all share identical 16-pin DIP/SOIC footprints, pin assignments, DC characteristics, and programming interfaces. The only differences are delay step size (1 ns vs. 0.5 ns or 2 ns) and maximum delay range (255 ns vs. 127.5 ns or 510 ns). This allows direct substitution in existing PCB layouts when adjusting resolution/range trade-offs without redesign.