DS1669S-100+T&R

Digital Potentiometers Overview

The DS1669S-100+T&R is a digital rheostat from the Dallastat family, housed in an 8-pin SOIC package. It provides 64 uniform tap points with a standard resistance of 100 kΩ. The device operates on a differential supply voltage ranging from 4.5 V to 8 V and draws 1–2 mA during operation. It features nonvolatile EEPROM memory that retains wiper settings without power, supporting over 80,000 write cycles. Control inputs include UC, DC, and D for contact closure or digital source interfacing.

Digital Potentiometers Feature Summary

• Nonvolatile wiper position storage via EEPROM array
• 64-position uniform tap resolution
• Contact-closure (UC/DC) and digital (D) control interfaces
• Industrial temperature range: -40°C to +85°C

Digital Potentiometers Applications

• Volume and tone control circuits
• Contrast and brightness adjustment
• Dimmer control systems

Digital Potentiometers Procurement Notes

Verify component authenticity through authorized distributors. Confirm RoHS compliance status (+ suffix indicates lead-free). Check datasheet for absolute maximum ratings to ensure supply voltage does not exceed 8.0 V differential. Validate package dimensions against PCB footprint requirements for 8-SOIC.

Digital Potentiometers Selection Notes

Select based on required resistance value; this model is fixed at 100 kΩ. Ensure supply voltage stays within 4.5 V to 8.0 V differential. Consider interface type: use UC/DC for pushbutton control or D for microprocessor integration. Verify thermal management needs as wiper resistance is typically 400 Ω.

Digital Potentiometers Part Context

Part of the Maxim Integrated DS1669 Dallastat series. Replaces mechanical variable resistors. Available in DIP and SOIC packages. Standard values include 10 kΩ, 50 kΩ, and 100 kΩ variants.

Digital Potentiometers Replacement Considerations

DS1669S-100 (non-RoHS version). DS1669S-50+T&R (50 kΩ variant). DS1669S-10+T&R (10 kΩ variant). Package remains 8-SOIC across variants.

Digital Potentiometers FAQ

How is wiper position maintained when power is removed?

The DS1669 uses an EEPROM memory cell array to store the last wiper position. Upon power-up, the device restores this setting automatically.

What is the minimum pulse width required for input recognition?

A single pulse must be greater than 1 ms but no longer than 1 second to cause a one-tap movement. Repetitive pulses must be separated by at least 1 ms.

Can the DS1669 operate with a single pushbutton?

Yes, in single pushbutton mode, the UC input controls both increment and decrement directions. The DC input must be connected to VCC, and the D input can float.