Analog Devices Inc./Maxim Integrated DS1023S-500+T&R

Overview

DS1023S-500+T&R 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 50 ns minimum input pulse width support. It operates from a single 5V supply, supports parallel/serial programming, and delivers full 0–360° clock phase control via on-chip reference delay. Used in precision timing alignment of high-speed digital clocks in test instrumentation and FPGA synchronization.

For engineers reviewing the DS1023S-500+T&R datasheet, DS1023S-500+T&R pinout, DS1023S-500+T&R application, or DS1023S-500+T&R equivalent, key selection criteria include guaranteed monotonicity, ±20 ns integral non-linearity, PWM output capability, oscillator configuration support, and compatibility with 10 MHz maximum input frequency under specified operating conditions.

Technical Context

The DS1023S-500+T&R implements a CMOS-based tapped delay line architecture with internal reference delay trimming to offset step-zero delay, enabling true zero-relative delay measurement against REF output. Its dual-output mode (OUT/REF or OUT/PWM) is selected via MS pin, and it supports both non-inverting delayed output and inverted free-running oscillator operation when OUT is externally looped to IN.

Programming flexibility includes parallel 8-bit latch mode (P/S = 0, LE-controlled) and serial daisy-chainable mode (P/S = 1, MSB-first), sharing P0–P2 pins between parallel inputs and serial I/O. Unused parallel inputs P3–P7 must be tied to defined logic levels; Q/P0 floats when unused in serial mode.

Key Specifications

Pinout & Package

DS1023S-500+T&R is supplied in a 16-pin SOIC (300-mil width) package with standard JEDEC MS-012AC footprint and 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 DS1023-500+, DS1023S-500+T&R offers identical electrical performance in a surface-mount package optimized for volume manufacturing, while MAX9622ESE+ trades programmability for lower power and simpler interface-making it viable only for static-delay applications.

Availability

DS1023S-500+T&R is available at Aetrix Electronics and suitable for test instrumentation, FPGA timing calibration, digital oscillator synthesis, and hardware PWM generation requiring stable component supply across extended production cycles.

Supply support for DS1023S-500+T&R 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 (acquired by Analog Devices in 2021) designs precision analog and mixed-signal ICs for industrial, communications, and computing markets, with heritage in timing, data conversion, and power management.

The DS1023 family was developed as a programmable silicon timing element targeting applications needing fine-grained, digitally controlled delay-especially where traditional RC or crystal-based solutions lack resolution, stability, or configurability.

FAQ

What is the maximum input frequency supported by DS1023S-500+T&R?

The DS1023S-500+T&R supports a maximum input frequency of 10 MHz, determined by its minimum input period specification of 100 ns. This limit arises from internal timing constraints including step size (5 ns), settling time (500 ns), and minimum pulse width (50 ns). Exceeding 10 MHz may cause inaccurate delay registration or failure to capture input transitions reliably. The device remains functional at higher frequencies only if input duty cycle and edge rates comply with AC specifications-but guaranteed timing accuracy applies strictly up to 10 MHz.

How does the REF output improve timing accuracy in DS1023S-500+T&R?

The REF output in DS1023S-500+T&R provides a fixed 18–22 ns on-chip reference delay that cancels process- and temperature-induced variations in step-zero delay. By measuring delay relative to REF instead of absolute IN→OUT, users eliminate offset errors-enabling true zero-relative phase adjustment and reducing total delay error to ±20 ns (integral non-linearity). This makes DS1023S-500+T&R suitable for applications demanding repeatable sub-ns timing alignment, such as multi-channel oscilloscope trigger distribution.

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

Yes, DS1023S-500+T&R can operate as a free-running oscillator by connecting the OUT pin back to the IN pin while setting MS = 1. In this configuration, the device produces an inverted, delayed copy of its own output-creating a ring oscillator whose frequency depends on the programmed delay value. For DS1023S-500+T&R, the resulting output frequency ranges from 400 kHz to 22 MHz. The oscillator is stable and jitter-controlled due to the device's guaranteed monotonicity and on-chip delay line architecture.

What is the purpose of the P/S and MS pins on DS1023S-500+T&R?

The P/S (Parallel/Serial Select) pin configures the programming interface: low enables parallel 8-bit loading via P0–P7, high enables serial programming via P2/D and P1/CLK. The MS (Mode Select) pin determines output functionality: low selects REF/OUT for delay line or phase-shifter use; high selects PWM/OUT for pulse-width modulation or oscillator operation. Together, these pins provide four distinct operational modes without external logic-making DS1023S-500+T&R adaptable across diverse timing tasks using only two control signals.

Is DS1023S-500+T&R pin-compatible with earlier DS1020/DS1021 devices?

No, DS1023S-500+T&R is not pin-compatible with DS1020 or DS1021. Although programming logic is identical, DS1023S-500+T&R repurposes P0–P2 pins for dual-mode I/O (parallel input / serial I/O), whereas DS1020/DS1021 assign dedicated pins for serial clock and data. Additionally, DS1023S-500+T&R adds MS and REF/PWM functionality absent in earlier parts. Migration requires PCB layout revision and firmware updates to accommodate shared pin functions and new mode control.