Analog Devices Inc./Maxim Integrated DS1867S-050+T&R

Overview

DS1867S-050+T&R from Maxim Integrated (now Analog Devices) is a dual nonvolatile digital potentiometer with EEPROM, featuring two 256-position wiper settings, 50 kΩ end-to-end resistance per pot, ±0.75 LSB absolute linearity, and operation from single 5V supply. It serves as a precision programmable resistor in analog gain/attenuation circuits for industrial instrumentation and optical module control.

For engineers reviewing the DS1867S-050+T&R datasheet, DS1867S-050+T&R pinout, DS1867S-050+T&R application, or DS1867S-050+T&R equivalent, key selection considerations include EEPROM write endurance (25,000 cycles), stacked/cascaded configuration support, 100 kHz –3 dB bandwidth (at 50 kΩ), and SOIC-16 surface-mount packaging with verified wiper nonvolatility across –40°C to +85°C.

Technical Context

The DS1867S-050+T&R implements a 3-wire serial interface (RST, CLK, DQ) for bidirectional wiper position control and readback, with an internal 17-bit I/O shift register storing two 8-bit wiper values plus a stack-select bit. Its EEPROM shadow memory automatically stores wiper positions during power-down when VCC drops below 4.5 V, requiring ≥4 ms between 4.5 V and 3.0 V for guaranteed retention.

It supports stacked configuration (series connection of both pots) for 100 kΩ total resistance and 512-step resolution, with SOUT providing multiplexed wiper output selected by the stack bit. Cascading is enabled via COUT-to-DQ daisy-chaining, supporting multi-device control on one bus with 70 ns propagation delay per stage.

Key Specifications

Pinout & Package

DS1867S-050+T&R is packaged in a 16-pin SOIC (300-mil) surface-mount outline with exposed pad not present. Pin functions are electrically validated per Maxim's DS1867 datasheet Rev 0, with all pins assigned per manufacturer-specified terminal roles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5232BRUZ10 and MCP42050-I/SL, DS1867S-050+T&R uniquely combines 50 kΩ resistance, true 3-wire simplicity, EEPROM retention, and hardware-supported stacking-making it optimal for space-constrained optical module designs requiring zero-power-loss calibration persistence.

Availability

DS1867S-050+T&R is available at Aetrix Electronics and suitable for industrial instrumentation, optical transceiver calibration, and factory-trimmed analog signal chains requiring stable component supply and guaranteed long-term parametric consistency.

Supply support for DS1867S-050+T&R 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 applications.

The DS1867S-050+T&R belongs to Maxim's digital potentiometer product line, engineered specifically for nonvolatile, low-noise analog trimming in optical modules and sensor interfaces where calibration persistence is mandatory.

FAQ

What is the resistance tolerance of the DS1867S-050+T&R?

The DS1867S-050+T&R has a ±20% end-to-end resistance tolerance at 25°C, meaning its actual resistance falls between 40 kΩ and 60 kΩ. This tolerance applies to the 50 kΩ nominal value per potentiometer and affects absolute gain/attenuation accuracy but not relative step resolution, which remains fixed at 256 positions.

Does the DS1867S-050+T&R require external components for EEPROM write operation?

No, the DS1867S-050+T&R performs automatic EEPROM writes during power-down without external circuitry. When VCC drops below 4.5 V, the device detects the transition and initiates internal storage of the current wiper positions into EEPROM, provided the power-down time from 4.5 V to 3.0 V exceeds 4 ms.

Can the DS1867S-050+T&R operate with a ±5 V supply?

Yes, the DS1867S-050+T&R supports both single 5 V and dual ±5 V supplies. When using ±5 V, VB must be connected to –5 V to bias the substrate correctly, enabling full-range analog signal handling across –5 V to +5 V at resistor terminals H0/H1, L0/L1, and W0/W1.

What is the maximum clock frequency supported by the DS1867S-050+T&R serial interface?

The DS1867S-050+T&R supports a maximum CLK frequency of 10 MHz, as specified in its AC Electrical Characteristics table. At this rate, a full 17-bit transaction completes in under 1.7 µs, enabling rapid wiper updates in closed-loop control systems without interrupting real-time operation.

How does the stacked configuration affect resolution and total resistance in the DS1867S-050+T&R?

In stacked configuration, the DS1867S-050+T&R connects both 50 kΩ pots in series, yielding 100 kΩ total resistance while retaining 256-step resolution per segment. The effective wiper resolution becomes 512 positions, but the step size remains RTOT/256 = 100 kΩ/256 ≈ 391 Ω per step, not 100 kΩ/512.