Analog Devices Inc./Maxim Integrated DS28E07Q+T

Overview

DS28E07Q+T from Analog Devices is a 1024-bit, 1-Wire® EEPROM organized as four 256-bit user memory pages with individual write protection and EPROM-emulation mode (1→0 only), factory-programmed 64-bit ROM ID for node addressing, and operation from 3.0V to 5.25V across –40°C to +85°C - used in ink cartridge identification, medical sensor calibration storage, and IEEE P1451.4 smart sensor systems.

For engineers reviewing the DS28E07Q+T datasheet, DS28E07Q+T pinout, DS28E07Q+T application, or DS28E07Q+T equivalent, key selection criteria include 1-Wire single-pin interface timing (15.4kbps/125kbps), per-page write protection control, scratchpad-based write verification, ±8kV HBM ESD rating on IO, and compatibility with parasitic power or V_CC-powered 1-Wire networks.

Technical Context

The DS28E07Q+T implements a true 1-Wire interface with open-drain IO requiring external pullup, supporting both standard-speed (65µs time slot) and overdrive-speed (9µs time slot) communication. Its memory architecture separates four 256-bit user pages from 64-bit scratchpad, 64-bit administrative data (including four page-protection bytes), and immutable 64-bit ROM ID.

Write operations require two-phase execution: first writing to the 8-byte scratchpad with address-aligned 8-byte boundaries, then verifying via CRC-16 or read-back before issuing Copy Scratchpad; protection modes (write-protect or EPROM-emulation) are enforced at the page level by administrative byte settings and affect scratchpad loading behavior during Write Scratchpad commands.

Key Specifications

Pinout & Package

DS28E07Q+T is supplied in TSOC (Thin Small Outline Package) with 3 pins: IO (1-Wire bidirectional open-drain interface), GND (ground reference), and N.C. (no connection). The package supports surface-mount assembly and is qualified for industrial environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-Wire EEPROM applications.

Compared with DS28E07Q+T, DS28EC20 offers double memory and enhanced endurance for scalable calibration storage, while DS2431 provides minimal 1-Wire identity at lower cost but sacrifices protection features essential for anti-counterfeiting and secure configuration.

Availability

DS28E07Q+T is available at Aetrix Electronics and suitable for ink cartridge identification, medical sensor calibration storage, and after-market consumables management requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.

Supply support for DS28E07Q+T 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial, and healthcare applications.

The DS28E07Q+T belongs to Analog Devices' 1-Wire EEPROM product line, designed specifically for secure, low-pin-count identification and calibration data storage in consumables, sensors, and accessories where tamper resistance and factory-unique identity are critical.

FAQ

What is the function of the N.C. pin on the DS28E07Q+T?

The N.C. (No Connection) pin on the DS28E07Q+T is an unconnected, unbonded terminal with no internal circuitry. It must remain floating and unconnected on the PCB to avoid unintended electrical coupling or mechanical stress. This pin is present due to package constraints in the TSOC outline but carries zero functional role in DS28E07Q+T operation or 1-Wire communication.

Does the DS28E07Q+T support parasitic power mode?

Yes, the DS28E07Q+T fully supports parasitic power operation using only the IO and GND pins - no V_CC connection required. During 1-Wire communication, it harvests energy from the IO line via internal charge pump circuitry. For reliable parasitic operation, the external pullup resistor must be sized per datasheet guidelines (300Ω–2200Ω), and strong-pullup activation is mandatory during EEPROM programming (tPROG = 12ms).

How does EPROM-emulation mode work in the DS28E07Q+T?

In EPROM-emulation mode, each of the four user memory pages can be configured to allow only 1→0 bit transitions - new data is logically ANDed with existing memory contents. To enable this, the corresponding protection byte (0080h–0083h) must be set to 0xAA. The page must first be erased to 0xFF before use. This mode supports nonvolatile counters and irreversible configuration flags, and is enforced at the hardware level during Write Scratchpad execution.

What is the purpose of the scratchpad in the DS28E07Q+T?

The 8-byte scratchpad in the DS28E07Q+T serves as a volatile staging buffer for EEPROM writes. Data is first written to the scratchpad, verified via CRC-16 or read-back, and only then copied to main memory using the Copy Scratchpad command. This two-step process prevents partial or corrupted writes and enables host-side validation before committing to nonvolatile storage - a critical safeguard for calibration or security-critical data.

Can the DS28E07Q+T be used in multidrop 1-Wire networks?

Yes, the DS28E07Q+T is explicitly designed for multidrop 1-Wire networks. Its factory-programmed 64-bit ROM ID acts as a unique node address, enabling the bus master to select individual devices using Match ROM or Search ROM commands. Up to hundreds of DS28E07Q+T devices can coexist on a single 1-Wire bus, each independently accessible without address conflicts or external multiplexing.