Analog Devices Inc./Maxim Integrated DS1867E-100

Overview

DS1867E-100 from Maxim Integrated (now Analog Devices) is a dual-channel, nonvolatile digital potentiometer with EEPROM wiper storage, 100 kΩ end-to-end resistance per channel, 256-position resolution, and 3-wire serial interface. It operates from a single 5V supply and maintains wiper settings across power cycles for precision analog tuning in industrial sensor calibration and programmable gain amplifiers.

For engineers reviewing the DS1867E-100 datasheet, DS1867E-100 pinout, DS1867E-100 application, or DS1867E-100 equivalent, key selection considerations include EEPROM endurance (25,000 writes), ±0.75 LSB absolute linearity, stacked configuration support via SOUT/COUT, and compatibility with single-processor daisy-chained control of multiple units.

Technical Context

The DS1867E-100 implements two independent 256-tap resistive dividers controlled by an internal 17-bit I/O shift register, where bits 1–8 set potentiometer-1 wiper position and bits 9–16 set potentiometer-0. Wiper values are retained in EEPROM shadow memory during power-down sequences triggered at VCC ≤ 4.5 V, requiring ≥4 ms to complete storage.

Its 3-wire serial interface (RST, CLK, DQ) supports both write and read operations; cascading uses COUT-to-DQ daisy chaining with 70 ns propagation delay per device. Stacked mode enables 512-step combined resolution using SOUT output and stack-select bit (bit 0), while resistor terminals tolerate VB = GND to –5.5 V for bipolar operation.

Key Specifications

Pinout & Package

DS1867E-100 is packaged in a 20-pin TSSOP (173-mil body width) with exposed pad for thermal management. Pin assignments follow the official Maxim pinout diagram for the 20-pin variant, including dedicated NC and DNC pins as specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5232BRUZ100 and MCP42100-E/SL, the DS1867E-100 uniquely combines 3-wire simplicity, automatic EEPROM save on brownout, and bipolar resistor biasing - making it optimal for industrial systems where reliability across uncontrolled power events is critical.

Availability

DS1867E-100 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable gain amplifiers, laser diode bias control, and audio level management requiring stable component supply across long-lifecycle deployments.

Supply support for DS1867E-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

Analog Devices (formerly Maxim Integrated) designs high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement, power management, and connectivity applications.

The DS1867E-100 belongs to Maxim's legacy digital potentiometer family, engineered specifically for systems demanding nonvolatile analog tuning without microcontroller dependency or external memory.

FAQ

What is the resistance tolerance of the DS1867E-100?

The DS1867E-100 has a ±20% end-to-end resistance tolerance at 25°C, as specified in the Analog Devices datasheet. This tolerance applies to the nominal 100 kΩ value per potentiometer channel and affects absolute gain/attenuation accuracy but not relative step linearity, which remains ±0.75 LSB. Designers should account for this variance in precision calibration loops.

Does the DS1867E-100 require external pull-up resistors on its serial interface lines?

No, the DS1867E-100 does not require external pull-up resistors on RST, CLK, or DQ. Its 3-wire serial interface uses active-drive logic with defined VIH/VIL thresholds (2.0 V min / 0.8 V max), and internal circuitry handles signal integrity without external biasing. Pull-ups may cause timing violations or excessive current if added.

Can the DS1867E-100 operate with a negative substrate bias (VB) while powered from a single +5V supply?

Yes, the DS1867E-100 supports VB = –5.5 V while VCC = +5 V, enabling resistor terminals (H/L/W) to swing below ground. This allows AC-coupled signal paths and bipolar operation in amplifier configurations. The datasheet specifies that resistor pin voltages must stay within VB to VCC+0.5 V, so proper level-shifting of control signals is required when VB ≠ GND.

How many times can the EEPROM in the DS1867E-100 be written before failure?

The EEPROM in the DS1867E-100 is rated for 25,000 write cycles under normal operating conditions (–40°C to +85°C). Each write corresponds to a controlled power-down event that stores the current wiper state. Writes performed outside specification (e.g., insufficient power-down time) may reduce endurance. The DS1867E-100 continues functional operation even after EEPROM wear-out, though wiper settings will no longer persist across power cycles.

Is the DS1867E-100 pin-compatible with the DS1867-100 or DS1867Z-100 variants?

Yes, the DS1867E-100 shares identical pinout, electrical specifications, and functionality with DS1867-100 and DS1867Z-100 across all packages (SOIC, TSSOP, DIP). The "E" suffix denotes the 20-pin TSSOP package per Maxim's naming convention, and all variants use the same die and EEPROM architecture. No PCB layout changes are needed when substituting between these part numbers in the same package form factor.