Analog Devices Inc./Maxim Integrated DS1045S-4

Overview

DS1045S-4 from Maxim Integrated (formerly Dallas Semiconductor) is a 4-bit dual programmable silicon delay line with one input and two independently programmable outputs, offering 9ns to 69ns delay range in 4ns increments, ±3.3ns max tolerance, TTL/CMOS-compatible, and designed for precise edge-aligned timing in digital synchronization circuits.

For engineers reviewing the DS1045S-4 datasheet, DS1045S-4 pinout, DS1045S-4 application, or DS1045S-4 equivalent, this device supports deterministic input-to-output delay programming via parallel A0–A3/B0–B3 inputs, enables dual-output skew control in test instrumentation and FPGA interface timing, and requires attention to tPDV (10ns delay validation time) and enable timing constraints (tDSE/tDHE).

Technical Context

The DS1045S-4 implements two independent 4-bit delay paths driven by a shared input signal, each configurable via dedicated 4-bit parallel inputs (A0–A3 for OUTA; B0–B3 for OUTB), with fixed 4ns step resolution across all 16 delay values (9ns to 69ns). It uses low-power CMOS circuitry and maintains both rising- and falling-edge accuracy within ±3.3ns total delay tolerance.

Delay selection is static or dynamic: EA/EB pins allow latched programming with tDSE = 10ns setup and tDHE = 0ns hold; when EA/EB are held high, programming is transparent. Output drive capability supports ten 74LS loads, and undefined inputs must be tied to valid logic levels to prevent floating-node instability.

Key Specifications

Pinout & Package

DS1045S-4 is supplied in a 16-pin SOIC (300-mil body width, surface-mount), pin-compatible with the DIP version but optimized for automated PCB assembly and space-constrained layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1045-4 and MAX962, the DS1045S-4 uniquely delivers dual, independently programmable delay paths in a surface-mount SOIC package - making it optimal for production-ready PCBs needing compact, repeatable inter-signal timing control without sacrificing pin compatibility or thermal stability.

Availability

DS1045S-4 is available at Aetrix Electronics and suitable for test equipment signal skew control, FPGA I/O timing calibration, and industrial PLC input debouncing requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for DS1045S-4 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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability timing solutions for industrial, communications, and test equipment markets.

The DS1045S-4 belongs to Maxim's programmable delay line product line, engineered to replace hybrid delay modules with all-silicon reliability, consistent edge accuracy, and auto-insertable packaging for high-volume manufacturing.

FAQ

What is the minimum and maximum delay achievable with the DS1045S-4?

The DS1045S-4 provides a programmable delay range from 9ns to 69ns in uniform 4ns increments. This yields exactly 16 discrete delay values (e.g., 9ns, 13ns, 17ns…69ns), as defined by its 4-bit parallel programming inputs A0–A3 and B0–B3. The minimum delay of 9ns includes inherent propagation, and the maximum is strictly bounded at 69ns per output path.

Does the DS1045S-4 preserve both rising and falling edge timing accuracy?

Yes, the DS1045S-4 guarantees edge-aligned delay accuracy on both rising and falling edges of the input signal, with total delay tolerance specified as ±3.3ns over 0°C to +70°C. This ensures pulse width integrity and eliminates duty-cycle distortion - a key requirement for applications like digital sampling and clock distribution where waveform fidelity matters.

How do EA and EB pins function in the DS1045S-4?

The EA and EB pins are active-high enable controls for OUTA and OUTB, respectively. When held high, each output reflects its programmed delay; when pulled low, the corresponding output enters high-impedance state. In latched programming mode, these pins also serve as clocks - data on A0–A3/B0–B3 must meet tDSE = 10ns setup and tDHE = 0ns hold relative to the EA/EB rising edge.

Can the DS1045S-4 be used with 3.3V logic systems?

No, the DS1045S-4 is designed exclusively for 5V operation (VCC = 4.75V to 5.25V) and features TTL/CMOS-compatible inputs that accept 0.8V/2.2V thresholds. It does not support 3.3V supply or input logic levels. Interfacing with 3.3V systems requires level translation on both inputs and outputs to avoid undervoltage operation or damage.

What is the recommended decoupling for the DS1045S-4?

A 0.1µF ceramic capacitor should be placed as close as possible to the VCC and GND pins of the DS1045S-4 to suppress high-frequency supply noise. For systems with heavy switching loads or noisy environments, adding a 4.7µF tantalum or aluminum electrolytic capacitor in parallel improves low-frequency regulation. Proper decoupling is essential to maintain ±3.3ns delay accuracy and prevent output jitter.