Analog Devices Inc./Maxim Integrated DS1023S-100

Overview

DS1023S-100 from Maxim Integrated (formerly Dallas Semiconductor) is an 8-bit programmable silicon delay line configured for 1 ns step resolution, 255 ns maximum delay in normal mode, and 25 MHz input frequency support. It operates from a single 5V supply, supports parallel or serial programming, and delivers precise clock phase control, pulse width modulation, or free-running oscillator functionality in industrial timing systems.

For engineers reviewing the DS1023S-100 datasheet, DS1023S-100 pinout, DS1023S-100 application, or DS1023S-100 equivalent, key selection considerations include its 1 ns delay step size, on-chip reference delay for zero-phase-offset calibration, dual-output mode select (REF/PWM and OUT), latch-enable-controlled parallel loading, and daisy-chain-capable serial interface for multi-device timing synchronization.

Technical Context

The DS1023S-100 implements a digitally programmable analog delay architecture with internal trimming to ensure monotonic delay response and ±4 ns integral non-linearity. Its reference delay output (REF) is trimmed to ~22 ns-slightly exceeding the step-zero delay-to enable true 0°–360° clock phase adjustment when referenced against OUT.

Mode Select (MS) configures two distinct functional modes: MS = 0 enables REF (fixed reference) and non-inverting delayed OUT; MS = 1 enables PWM (rising-edge-triggered pulse width modulated output) and inverting delayed OUT, supporting external feedback for oscillator operation. The device uses CMOS logic and requires all unused parallel inputs (P3–P7) to be tied to defined logic levels.

Key Specifications

Pinout & Package

DS1023S-100 is housed in a 16-pin 300-mil SOIC package with standard JEDEC MO-012AC footprint (5.33 mm × 10.16 mm, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1023-100, the DS1023S-100 offers identical timing performance in surface-mount form for volume manufacturing, while the MAX9622 targets fundamentally different signal integrity applications-making it unsuitable as a drop-in replacement but relevant only in high-frequency clock conditioning contexts.

Availability

DS1023S-100 is available at Aetrix Electronics and suitable for industrial automation controllers, test equipment timing subsystems, and FPGA-based communication interface designs requiring stable component supply and long-term obsolescence management.

Supply support for DS1023S-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 DS1023S-100 belongs to Maxim's programmable timing element family, engineered for applications demanding deterministic, digitally adjustable signal delays with on-chip calibration and multi-function flexibility.

FAQ

What is the minimum usable input pulse width for DS1023S-100 in PWM mode?

The DS1023S-100 specifies a minimum input pulse width of 20 ns in both normal delay and PWM modes. This ensures reliable triggering of the internal delay chain and PWM generation circuitry. Pulses narrower than 20 ns may cause inconsistent output behavior or failure to register the input edge, particularly under worst-case temperature and voltage conditions. For robust PWM operation, maintain ≥20 ns input pulses per the AC Electrical Characteristics table on page 11 of the official DS1023 datasheet.

Can DS1023S-100 generate a free-running oscillator, and what is its frequency range?

Yes, DS1023S-100 can operate as a free-running oscillator by connecting its OUT pin back to the IN pin. In this configuration, the output period equals twice the programmed delay value. For DS1023S-100 (1 ns step), the oscillator frequency ranges from 1.9 MHz (at 255 ns delay) to 22 MHz (at 22.7 ns delay), as specified in Table 2 of the datasheet. The actual frequency depends on the programmed code and exhibits typical variation due to step-zero delay tolerance.

How does the REF output improve timing accuracy in DS1023S-100?

The REF output in DS1023S-100 is a trimmed, fixed ~22 ns delay that matches the device's step-zero delay. By measuring delay relative to REF instead of absolute IN-to-OUT time, DS1023S-100 cancels variations caused by input voltage levels, transition times, and process/temperature drift. This differential measurement enables true zero-delay calibration and achieves higher repeatability-critical for phase alignment and jitter-sensitive applications.

Is DS1023S-100 pin-compatible with DS1020 or DS1021?

No, DS1023S-100 is not pin-compatible with DS1020 or DS1021. While programming logic is identical and P/S pin polarity is reversed for compatibility, DS1023S-100 adds dedicated MS (Mode Select) and REF/PWM functionality not present on earlier devices. Pin assignments differ: DS1023S-100 uses P7–P3 as dedicated parallel inputs, whereas DS1020/DS1021 repurpose those pins. Board-level replacement requires schematic and layout revision.

What is the purpose of the LE (Latch Enable) pin in DS1023S-100 parallel programming mode?

In DS1023S-100 parallel programming mode (P/S = 0), the LE pin controls data latching: when LE is high, parallel inputs (P0–P7) are transparent to the internal register; when LE transitions low, the current 8-bit value is captured and held. This allows multiplexed bus interfacing-data can be updated continuously on the bus while LE holds the active delay setting. For static configurations, LE is tied high to enable immediate delay updates on input changes.