Analog Devices Inc./Maxim Integrated DS1045S-4/T&R

Overview

DS1045S-4/T&R from Maxim Integrated (formerly Dallas Semiconductor) is a 4-bit dual programmable silicon delay line IC with one input and two independently programmable outputs. It delivers precise, edge-aligned delays from 9ns to 69ns in 4ns increments, supports TTL/CMOS logic levels, drives ten 74LS loads, and operates at 5V ±5% across 0°C to 70°C. It is used in high-speed digital timing alignment, such as clock skew correction in FPGA-based data acquisition systems.

For engineers reviewing the DS1045S-4/T&R datasheet, DS1045S-4/T&R pinout, DS1045S-4/T&R application, or DS1045S-4/T&R equivalent, key selection considerations include output-to-output delay range (9–69ns), parallel programming via A0–A3/B0–B3, dual enable pins (EA/EB), edge-accurate rising/falling delay, and SOIC-16 surface-mount packaging for automated assembly.

Technical Context

The DS1045S-4/T&R implements a fully static CMOS delay architecture with two independent 4-bit parallel-programmable delay paths. Each path accepts TTL-compatible inputs (VIH ≥2.2V, VIL ≤0.8V) and produces output pulses with matched rising-edge (tPLH) and falling-edge (tPHL) delays within ±3.3ns tolerance over temperature and voltage.

Delay selection is performed via hardwired or microcontroller-driven A0–A3 and B0–B3 inputs, with EA and EB enabling latched or non-latched operation. Settling time after programming is tEDV = 15ns (enable mode) or tPDV = 10ns (non-latched mode), and undefined inputs must be tied to valid logic levels to prevent CMOS leakage-induced instability.

Key Specifications

Pinout & Package

DS1045S-4/T&R is housed in a 16-pin SOIC (300-mil) surface-mount package, RoHS-compliant and auto-insertable per J-STD-020A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1045-4 and MAX9622, DS1045S-4/T&R uniquely combines dual independent digital delay paths, parallel 4-bit programming, and SOIC-16 packaging - making it the only option for automated SMT production requiring two precisely coordinated, statically configurable delays in commercial-temperature environments.

Availability

DS1045S-4/T&R is available at Aetrix Electronics and suitable for high-speed logic timing alignment, FPGA clock skew compensation, digital test equipment signal conditioning, and legacy system interface bridging requiring stable component supply and long-term manufacturability.

Supply support for DS1045S-4/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, mixed-signal, and timing solutions for industrial, communications, and computing applications.

The DS1045S-4/T&R belongs to Maxim's programmable delay line product line, engineered specifically for deterministic digital timing correction in commercial-grade logic systems where hybrid delay lines posed reliability and cost challenges.

FAQ

What is the minimum and maximum delay achievable with the DS1045S-4/T&R?

The DS1045S-4/T&R provides a programmable delay range from 9ns to 69ns in uniform 4ns increments. This is confirmed in Table 1 of the official datasheet, where DS1045-4 (the base variant of DS1045S-4/T&R) is specified with zero-delay offset of 9 ±1ns and maximum delay of 69ns. The SOIC package version DS1045S-4/T&R retains identical timing specifications.

How does the DS1045S-4/T&R handle rising and falling edge delays?

The DS1045S-4/T&R guarantees matched rising-edge (tPLH) and falling-edge (tPHL) delays within its specified tolerance of ±3.3ns. As stated in the Terminology section and AC Electrical Characteristics table, delay accuracy applies to both edges - ensuring preserved pulse width and eliminating duty-cycle distortion in delayed outputs.

Can the DS1045S-4/T&R be used with 3.3V logic systems?

No - the DS1045S-4/T&R is strictly a 5V device. Its recommended DC operating conditions specify VCC = 4.75V to 5.25V, and input logic thresholds (VIH ≥2.2V, VIL ≤0.8V) are defined relative to 5V. Driving it from 3.3V sources violates VIH minimum and risks unreliable operation; level-shifting is required for 3.3V system integration.

What is the function of EA and EB pins on the DS1045S-4/T&R?

EA and EB are independent active-high enable inputs that control latching of the A0–A3 and B0–B3 programming bits, respectively. When asserted, they capture parallel delay settings; when held high continuously, they allow static configuration using fixed logic levels (e.g., jumpers or DIP switches). Leaving them unconnected is invalid - they must be tied to VCC or controlled.

Is the DS1045S-4/T&R pin-compatible with other DS1045 variants like DS1045S-5?

Yes - all DS1045S-x variants (including DS1045S-4/T&R and DS1045S-5) share identical SOIC-16 pinouts and DC/AC electrical behavior except for delay range and tolerance. DS1045S-5 offers 9–84ns in 5ns steps (±4.1ns), while DS1045S-4/T&R delivers 9–69ns in 4ns steps (±3.3ns); no PCB change is needed for substitution within the same package.