Analog Devices Inc./Maxim Integrated DS1020S/T&R

Overview

DS1020S/T&R from Dallas Semiconductor (now Maxim Integrated) is a programmable 8-bit silicon delay line in 16-pin SOIC package, delivering precise, user-configurable time delays from 10 ns base + up to 520 ns in 2 ns steps (DS1020-200 variant), with TTL/CMOS-compatible I/O, dual programming interfaces (3-wire serial or 8-bit parallel), and edge-accurate non-inverting output reproduction. It serves in high-speed digital timing alignment, clock deskewing, and pulse-width adjustment circuits.

For engineers reviewing the DS1020S/T&R datasheet, DS1020S/T&R pinout, DS1020S/T&R application, or DS1020S/T&R equivalent, key selection considerations include step resolution (0.15–2 ns), inherent 10 ns base delay, serial daisy-chaining capability, parallel latch mode support, and SOIC-16 footprint compatibility with auto-insertion and vapor-phase soldering.

Technical Context

The DS1020S/T&R implements an all-CMOS, non-inverting delay architecture where input logic states are reproduced at OUT after a digitally programmed delay, with identical accuracy on both rising and falling edges. Its internal 8-bit register controls delay value selection across 256 discrete steps, and the MODE SELECT (S) pin determines whether programming occurs via parallel pins P0–P7 or serial clock/data (C/D/Q).

Serial operation supports daisy-chained configuration-Q of one device connects to D of the next-with MSB-first shifting and destructive readback requiring external 1–10 kΩ restoration resistor. Parallel mode allows hardwired (jumper/DIP switch) or bus-driven programming, with enable (E) acting as data latch control when S = 1.

Key Specifications

Pinout & Package

DS1020S/T&R is supplied in a 16-pin SOIC (300-mil) surface-mount package, RoHS-compliant, vapor-phase and IR solderable, with 1.27 mm pitch and low-profile profile suitable for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1023S/T&R and MAX9622ESE+, the DS1020S/T&R delivers best-in-class cost efficiency for 5 V digital systems requiring 0.15–2 ns step resolution, proven daisy-chain scalability, and industrial-grade temperature range (0–70 °C), without over-specifying resolution or voltage flexibility.

Availability

DS1020S/T&R is available at Aetrix Electronics and suitable for high-speed logic timing calibration, programmable clock deskewing, and pulse width adjustment applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for DS1020S/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

Dallas Semiconductor, acquired by Maxim Integrated in 2001, specialized in precision timing, memory, and analog interface ICs for industrial, telecom, and computing applications.

The DS1020S/T&R belongs to the Silicon Delay Line product line, engineered to replace hybrid and analog delay solutions with fully digital, CMOS-based programmability, targeting board-level timing alignment in mission-critical digital systems.

FAQ

What is the inherent (step-zero) delay of the DS1020S/T&R?

The DS1020S/T&R has a guaranteed inherent delay of 10 ns ±2 ns (for DS1020-15 through DS1020-100) or 10 ns ±3 ns (for DS1020-200), independent of programming. This base delay is present even when the parallel or serial register is set to zero, and forms the lower bound of the total delay range. All subsequent programmable increments are added to this fixed offset.

Does the DS1020S/T&R support daisy-chaining in serial mode?

Yes, the DS1020S/T&R supports daisy-chaining: its Q (serial output) pin can be connected to the D (serial input) pin of another DS1020S/T&R unit. In this configuration, eight clock cycles shift out the current register contents of the first device while simultaneously loading new data into the second, enabling synchronized multi-device programming with a single controller interface.

What is the maximum clock frequency supported for serial programming of the DS1020S/T&R?

The DS1020S/T&R supports a maximum serial clock (C) frequency of 10 MHz, as specified in its AC Electrical Characteristics table. This allows full 8-bit register loading in under 1 µs, enabling rapid reconfiguration in real-time timing adjustment applications-provided t_DSC ≥ 30 ns and t_DHC ≥ 10 ns timing constraints are met.

Can unused parallel input pins (P1–P7) be left floating on the DS1020S/T&R?

No-unused parallel input pins (P1–P7) on the DS1020S/T&R must be tied to a defined logic level (V_CC or GND). Because the device uses CMOS inputs, floating pins risk unpredictable switching, increased supply current, and potential functional instability. Only Q/P0 may float when unused in serial mode.

Is the DS1020S/T&R output inverted or non-inverted?

The DS1020S/T&R provides a non-inverted output: the logic state at IN is reproduced identically at OUT after the programmed delay, with no polarity reversal. This behavior is explicitly confirmed in the device description and applies to both rising and falling edges, preserving signal phase relationship critical for clock and data path integrity.