Analog Devices Inc./Maxim Integrated DS1123LE-50+

Overview

DS1123LE-50+ from Maxim Integrated is an 8-bit programmable timing element operating at 3.3V, functioning as a precision delay line, monostable vibrator, or free-running oscillator. It delivers 0.5ns step resolution across 256 steps (0–127.5ns max delay), supports parallel and 3-wire serial programming, and enables full 0°–360° clock phase shifting in telecom and test equipment.

For engineers reviewing the DS1123LE-50+ datasheet, DS1123LE-50+ pinout, DS1123LE-50+ application, or DS1123LE-50+ equivalent, key selection considerations include step size accuracy, reference-delay-referenced delay tolerance (±0.75%), monotonicity guarantee, 16-pin TSSOP package compatibility, and dual-mode operation (MS = 0 for delay line, MS = 1 for PWM/oscillator).

Technical Context

The DS1123LE-50+ implements an 8-bit latch-driven 255-stage delay cell array with on-chip reference delay (tREF = 18–22ns) matched to step-zero delay (tD0 = 16.5–22ns), enabling sub-step-zero relative delays. Its architecture supports both absolute delay (IN→OUT) and differential delay (REF→OUT), with integral nonlinearity bounded at ±2ns over full scale.

It features dual programming interfaces: parallel (P0–P7, LE, P/S = GND) for microprocessor control and 3-wire serial (CLK/P1, D/P2, Q/P0) for cascaded multi-device systems. Mode selection via MS pin determines functional behavior-delay line (MS = 0), or monostable/PWM/oscillator (MS = 1) with OUT-to-IN feedback.

Key Specifications

Pinout & Package

DS1123LE-50+ is housed in a 16-pin TSSOP (150-mil width) package with exposed pad not electrically connected. Pin functions are validated per Maxim's official pin configuration diagram and functional description.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1023S-50+, DS1123LE-50+ reduces supply voltage and adds REF output for differential timing; compared with LMK03806RHAT, it offers lower latency, simpler interface options, and dedicated monostable functionality-making it optimal for deterministic, low-overhead delay tasks in test and telecom hardware.

Availability

DS1123LE-50+ is available at Aetrix Electronics and suitable for telecommunications infrastructure, digital test equipment, digital video projection, and signal generator applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for DS1123LE-50+ 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 and mixed-signal ICs for industrial, communications, and computing markets, with emphasis on high-reliability timing, power, and interface solutions.

The DS1123L family was developed to provide field-programmable, low-jitter delay elements for clock phase alignment, test signal conditioning, and programmable pulse generation-targeting applications where analog delay lines lack resolution and PLLs add complexity.

FAQ

What is the maximum delay achievable with DS1123LE-50+ in delay line mode?

The DS1123LE-50+ achieves a maximum delay of 127.5ns with respect to the REF output when programmed to step 255. This value is derived from its 0.5ns step size and 256-step range. The absolute delay from IN to OUT at step 255 is up to 144ns, but REF-referenced delay is the more stable and specified metric due to tighter voltage/temperature tracking between REF and OUT outputs.

How does DS1123LE-50+ support differential delay measurements?

DS1123LE-50+ supports differential delay measurements via its dedicated REF/PWM pin, which provides a fixed ~20ns delay closely matched to the step-zero delay (tD0). By measuring delay between REF and OUT instead of IN and OUT, designers achieve sub-step-zero resolution and reduced sensitivity to supply/temperature variation-enabling precise skew compensation in high-speed interfaces.

Can DS1123LE-50+ operate as a free-running oscillator, and what frequency range is supported?

Yes, DS1123LE-50+ can operate as a free-running oscillator by setting MS = 1 and connecting OUT to IN. In this configuration, oscillation period equals twice the programmed delay, yielding frequencies from 0.98MHz (max delay) to 22MHz (min delay). The actual range depends on the selected step value and is documented in Table 2 of the datasheet.

Is DS1123LE-50+ pin-compatible with other DS1123L speed grades?

Yes, DS1123LE-50+ is pin-compatible with DS1123LE-25+, DS1123LE-100+, and DS1123LE-200+. All share identical 16-pin TSSOP packaging, pinout, and interface logic. Only the delay step size and maximum delay differ-allowing drop-in replacement during design iteration or performance tuning without PCB changes.

What is the minimum pulse width DS1123LE-50+ can generate in monostable mode?

In monostable vibrator mode (MS = 1), DS1123LE-50+ guarantees a minimum usable output pulse width of 5ns. This is limited by the output driver's physical slew rate and is specified under standard test conditions (VCC = 3.3V, TA = +25°C). Narrower pulses may be observed but risk degraded logic levels or missing transitions.