Analog Devices Inc./Maxim Integrated DS1867S-100

Overview

DS1867S-100 from Maxim Integrated (now Analog Devices) is a dual-channel, nonvolatile digital potentiometer with 256-position resolution per channel, 100 kΩ end-to-end resistance, EEPROM wiper storage, and 3-wire serial interface. It replaces mechanical trimmers in precision gain/attenuation circuits requiring power-loss immunity, such as programmable amplifier feedback networks and sensor calibration loops.

For engineers reviewing the DS1867S-100 datasheet, DS1867S-100 pinout, DS1867S-100 application, or DS1867S-100 equivalent, key selection considerations include its ±0.75 LSB absolute linearity, 100 kHz -3 dB bandwidth at 100 kΩ, industrial temperature range (-40°C to +85°C), and cascading capability for multi-device control over a single bus.

Technical Context

The DS1867S-100 implements two independent 8-bit-controlled resistive dividers with EEPROM-backed wiper positions stored during power-down via automatic 4 ms VCC trip-point detection (3.9–4.5 V). Its 3-wire serial port (RST/CLK/DQ) drives a 17-bit shift register containing wiper-0, wiper-1, and stack-select bits - enabling stacked or cascaded configurations without external logic.

Stacked mode connects H0–L1 internally to double total resistance to 200 kΩ while preserving 256-step resolution per pot; cascade mode uses COUT-to-DQ daisy-chaining with ≤70 ns propagation delay, supporting up to 17 × N-bit transfers across multiple devices on one bus.

Key Specifications

Pinout & Package

DS1867S-100 is packaged in 16-pin SOIC (300-mil), with pin 1 = VB, pin 16 = VCC. Pin functions are electrically validated per Maxim's DS1867 datasheet Rev 102199.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual digital potentiometer applications.

Compared with DS1867S-100, AD5232BRUZ100 offers finer resolution but lacks stacking and cascading; MCP42100-E/SL reduces cost and complexity but forfeits nonvolatility - making DS1867S-100 uniquely suited for unattended, field-calibrated analog systems requiring guaranteed post-power-up state.

Availability

DS1867S-100 is available at Aetrix Electronics and suitable for industrial instrumentation, sensor calibration modules, programmable gain amplifiers, and embedded test equipment requiring stable component supply and long-term parametric consistency.

Supply support for DS1867S-100 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 and mixed-signal ICs for industrial, automotive, and communications markets.

The DS1867S-100 belongs to Maxim's digital potentiometer family targeting replacement of electromechanical trimmers in calibration-critical systems where power-loss resilience and serial configurability are mandatory.

FAQ

What is the supply voltage range for the DS1867S-100?

The DS1867S-100 operates from a single 4.5 V to 5.5 V supply. It also supports ±5 V operation when substrate bias (VB) is set to –5 V. The device includes an internal power-trip circuit that triggers EEPROM wiper storage when VCC falls below 4.5 V, ensuring reliable nonvolatile retention across brownout conditions.

Does the DS1867S-100 require an external clock source or charge pump?

No, the DS1867S-100 uses a pumpless architecture and requires only the externally provided CLK signal from the host controller. Its 3-wire serial interface (RST/CLK/DQ) operates without internal clock generation or charge pumps, eliminating switching noise and simplifying layout in noise-sensitive analog signal chains.

How does the DS1867S-100 retain wiper settings during power loss?

The DS1867S-100 retains wiper positions using on-chip EEPROM memory. When VCC drops below 4.5 V, the device automatically initiates a 4 ms wiper storage sequence, writing the current 17-bit I/O register contents to EEPROM. This occurs transparently without host intervention and supports ≥25,000 write cycles.

Can multiple DS1867S-100 devices share one serial bus?

Yes, DS1867S-100 devices support daisy-chain cascading via the COUT-to-DQ connection. Each device passes shifted data downstream with ≤70 ns propagation delay, allowing a single microcontroller to configure dozens of units using only three GPIOs (RST/CLK/DQ) and minimal additional wiring.

What is the function of the SOUT pin on the DS1867S-100?

The SOUT pin on the DS1867S-100 delivers the multiplexed wiper output of either potentiometer-0 (W0) or potentiometer-1 (W1), selected by bit-0 (stack select) of the 17-bit I/O shift register. It is used exclusively in stacked configuration where H0 and L1 are connected to form a 200 kΩ ladder, enabling single-point access to the combined wiper.