Analog Devices Inc./Maxim Integrated DS1023S-25

Overview

DS1023S-25 from Maxim Integrated (formerly Dallas Semiconductor) is an 8-bit programmable silicon delay line configured for 0.25 ns step resolution, 63.75 ns maximum delay in normal mode, and full 0–360° clock phase control via on-chip reference delay. It supports parallel/serial programming, operates from a single 5V supply, and is packaged in 16-pin SOIC for precision timing in test equipment and digital synchronization circuits.

For engineers reviewing the DS1023S-25 datasheet, DS1023S-25 pinout, DS1023S-25 application, or DS1023S-25 equivalent, this page delivers verified timing parameters, mode-select behavior, PWM output capability, oscillator configuration limits, and real-world design implications of step-zero delay compensation and monotonic delay response.

Technical Context

The DS1023S-25 implements a revised internal delay line architecture enabling delays up to one full input clock period or more, with guaranteed monotonicity across all 256 programmed values. Its on-chip reference delay (18–22 ns typical) offsets inherent step-zero delay (−2 to +22 ns absolute), enabling true zero-relative delay calibration.

Mode Select (MS) configures dual-output functionality: MS = 0 enables REF (fixed reference delay) and OUT (non-inverted delayed output); MS = 1 enables PWM (rising-edge-triggered pulse width modulation) and inverted OUT for free-running oscillator use when externally looped. Serial programming shares P0/Q, P1/CLK, and P2/D pins with parallel inputs.

Key Specifications

Pinout & Package

DS1023S-25 is housed in a 16-pin 300-mil SOIC package (JEDEC MS-012AC), with 1.27 mm pitch, body width 7.5 mm, and thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1023-25 and MAX9622, the DS1023S-25 uniquely combines 0.25 ns step size, integrated reference delay for zero-offset calibration, and dual-mode (delay/PWM/oscillator) flexibility in a 5V SOIC package-making it optimal for cost-sensitive, single-channel, high-accuracy timing applications requiring minimal external components.

Availability

DS1023S-25 is available at Aetrix Electronics and suitable for digital test instrumentation, high-speed clock synchronization, pulse width modulation control, and free-running oscillator generation requiring stable component supply across extended production cycles.

Supply support for DS1023S-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, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, communications, and computing applications.

The DS1023 product line delivers programmable timing elements targeting applications demanding sub-nanosecond delay resolution, on-chip calibration references, and multi-function configurability without external passive components.

FAQ

What is the minimum input pulse width supported by DS1023S-25?

The DS1023S-25 requires a minimum input pulse width of 20 ns for reliable operation in normal and PWM modes. This specification ensures sufficient time for internal latch sampling and delay path stabilization. Violating this limit may cause degraded output voltage levels or complete loss of output pulse integrity, especially at the lower end of the programmable delay range. The DS1023S-25 datasheet explicitly defines this as a hard constraint-not a recommended guideline.

How does the REF output enable zero-relative delay calibration in DS1023S-25?

The REF output of DS1023S-25 provides a fixed 18–22 ns delay that closely matches the device's step-zero delay (−2 to +22 ns). By measuring delay relative to REF instead of ground-referenced IN, users eliminate the variable offset caused by process and temperature variations. This allows DS1023S-25 to achieve effective zero-delay settings and full 0–360° phase control-critical for clock deskew and jitter-sensitive applications.

Can DS1023S-25 generate a free-running oscillator, and what is its frequency range?

Yes, DS1023S-25 can operate as a free-running oscillator by connecting the OUT pin to the IN pin externally. In this configuration, the output frequency ranges from 6.6 MHz to 22 MHz depending on the programmed delay value. The DS1023S-25 datasheet specifies these bounds under worst-case step-zero delay conditions, with actual frequency determined by 2 × absolute delay value. No external components are required beyond the feedback trace.

What is the significance of guaranteed monotonicity in DS1023S-25's delay response?

Guaranteed monotonicity means the DS1023S-25's output delay strictly increases with each increment of the 8-bit programming word-no dips or reversals occur across all 256 values. This property is essential for closed-loop timing control systems, deterministic jitter analysis, and calibration algorithms that assume linear progression. It is verified across temperature and voltage extremes and distinguishes DS1023S-25 from non-monotonic analog delay solutions.

How does serial programming work on DS1023S-25, and what pins are shared with parallel mode?

Serial programming on DS1023S-25 uses P0/Q (data I/O), P1/CLK (clock), and P2/D (data input) pins-shared with parallel inputs P0, P1, and P2. Data loads MSB-first on CLK rising edges while LE is high; new value activates when LE goes low. Daisy-chaining is supported by routing Q of one DS1023S-25 to D of the next. The P/S pin selects serial mode (high), and unused parallel pins P3–P7 must be tied to defined logic levels to prevent CMOS floating-input issues.