Analog Devices Inc./Maxim Integrated DS1135U-30+

Overview

DS1135U-30+ from Maxim Integrated is a high-speed, all-silicon 3-channel digital delay line operating at +5V, delivering precise 30ns propagation delay per output (tPLH/tPHL) with ±1.5ns initial tolerance and ±2ns variation over -40°C to +85°C. It features independent buffered outputs capable of driving 10 LS loads, leading/trailing edge symmetry preservation, and SOIC-8 (150-mil) packaging. Used in high-speed timing alignment for clock distribution and signal deskewing in industrial control systems.

For engineers reviewing the DS1135U-30+ datasheet, DS1135U-30+ pinout, DS1135U-30+ application, or DS1135U-30+ equivalent, key selection considerations include guaranteed 30ns delay accuracy across temperature/voltage, 5V-only operation, SOIC-8 footprint compatibility, and direct replacement suitability for legacy DS1013/DS1035 designs requiring improved edge fidelity and thermal stability.

Technical Context

The DS1135U-30+ implements three independent, fully buffered CMOS delay paths within a single silicon die, each with matched tPLH and tPHL characteristics. Its architecture preserves input signal symmetry by maintaining equal rise/fall delay contributions, critical for duty-cycle-sensitive applications like clock forwarding.

It operates strictly at +5V (4.75V–5.25V), with no 3V support-DS1135L variants serve that voltage domain. Power-up stabilization requires ≤100ms, and outputs meet 2.0–2.5ns rise/fall time specs into 15pF loads while sustaining full drive strength across industrial temperature range.

Key Specifications

Pinout & Package

DS1135U-30+ is housed in an 8-pin SOIC package (150-mil width, outline 21-0041), RoHS-compliant (indicated by '+' suffix), with standard gull-wing lead form and 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1135Z-30+ and DS1013-30+, the DS1135U-30+ uniquely combines ultra-thin SOIC packaging, ±1.5ns initial delay accuracy, and full -40°C to +85°C operation - making it optimal for compact, high-reliability timing-critical embedded systems where mechanical fit and thermal robustness are co-constrained.

Availability

DS1135U-30+ is available at Aetrix Electronics and suitable for high-speed clock deskewing, industrial bus signal alignment, and test equipment pulse shaping requiring stable component supply and guaranteed long-term sourcing.

Supply support for DS1135U-30+ 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, mixed-signal, and timing ICs for industrial, automotive, and communications applications, emphasizing reliability, integration, and performance under stress.

The DS1135U-30+ belongs to Maxim's silicon delay line product line, engineered specifically for deterministic, low-jitter signal alignment in high-speed digital systems where quartz or programmable solutions introduce unacceptable latency or variability.

FAQ

What is the guaranteed delay accuracy of DS1135U-30+ over temperature and voltage?

The DS1135U-30+ guarantees ±2ns total delay variation across the full industrial temperature range (-40°C to +85°C) and supply voltage range (4.75V to 5.25V). This includes both initial tolerance (±1.5ns at +25°C/5.0V) and additional drift due to environmental changes. The specification applies equally to tPLH and tPHL, ensuring matched rising and falling edge delays critical for duty-cycle preservation in the DS1135U-30+.

Can DS1135U-30+ operate from a 3.3V supply?

No, DS1135U-30+ is specified exclusively for +5V operation (4.75V to 5.25V). It is not compatible with 3.3V or lower supply rails. For 3V applications, Maxim offers the pin-compatible DS1135L series - e.g., DS1135L-30+ - which shares the same delay value and SOIC-8 footprint but is characterized for 2.7V–3.6V operation. Using DS1135U-30+ below 4.75V may result in undefined timing behavior or functional failure.

Is DS1135U-30+ pin-compatible with DS1013 or DS1035?

Yes, DS1135U-30+ uses the same 8-pin SOIC-150mil package and identical pinout (IN1–IN3, OUT1–OUT3, VCC, GND) as DS1013 and DS1035. Maxim explicitly recommends DS1135U-30+ as a recommended replacement. However, note that DS1135U-30+ draws less current (35mA typical vs. 55mA for DS1013) and delivers tighter delay tolerance (±1.5ns vs. ±5ns), so existing designs benefit from improved thermal performance and timing margin without layout changes.

What load capacitance is assumed for the 2.0–2.5ns rise/fall time specification of DS1135U-30+?

The DS1135U-30+ rise and fall time specification (2.0–2.5ns, measured 20%–80%) is characterized with a 15pF capacitive load and 50Ω source termination, per Maxim's official test conditions. This reflects typical loading from a single 74F04 input gate. Driving heavier capacitive loads (>25pF) will increase transition times and may degrade delay accuracy; for such cases, buffer amplification or layout optimization is recommended to maintain signal integrity in the DS1135U-30+.

Does DS1135U-30+ require external passive components for stable operation?

No, DS1135U-30+ is a fully self-contained delay line requiring only a single 0.1µF ceramic decoupling capacitor placed as close as possible between VCC and GND pins. No external resistors, capacitors, or crystals are needed. The all-silicon architecture eliminates tuning components, reducing BOM count and layout sensitivity. Proper PCB grounding and short VCC/GND traces remain essential to preserve the DS1135U-30+'s specified delay stability and edge fidelity.