Analog Devices Inc./Maxim Integrated DS28E10R+T

Overview

DS28E10R+T from Maxim Integrated is a 1-Wire SHA-1 authenticator IC integrating a hardware-accelerated 512-bit SHA-1 engine, 224-bit one-time programmable (OTP) EPROM, and a factory-programmed unique 64-bit ROM ID in a 3-lead SOT23 package. It operates from 2.8V to 3.6V across –40°C to +85°C and delivers secure challenge-and-response authentication for sensor calibration, accessory verification, and IP license enforcement.

For engineers reviewing the DS28E10R+T datasheet, DS28E10R+T pinout, DS28E10R+T application, or DS28E10R+T equivalent, key selection considerations include its 1-Wire interface timing (15.4kbps standard / 125kbps overdrive), irreversible OTP write protection, ±6kV HBM ESD rating on IO/VCC, guaranteed 10-year data retention at +85°C, and compatibility with standard 1-Wire bus masters including microcontrollers and DS2482-x00 line drivers.

Technical Context

The DS28E10R+T implements a dedicated hardware SHA-1 engine compliant with FIPS 180-3, performing full 160-bit MAC generation without host CPU involvement. Its 28-byte OTP memory is organized in 7 blocks of 4 bytes each, with automatic write protection triggered after any block programming.

Communication follows the 1-Wire protocol with strict timing: reset pulse ≥480μs (standard) or ≥48μs (overdrive), presence detect sampling window tMSP = 60–75μs, and read sample time tMSR ≤15μs. The open-drain IO pin requires an external pullup resistor (≤2.2kΩ) and supports both standard and overdrive speed modes via Overdrive-Skip ROM or Overdrive-Match ROM commands.

Key Specifications

Pinout & Package

DS28E10R+T is housed in a RoHS-compliant 3-lead SOT23 package (3.0mm × 1.7mm × 1.3mm height), optimized for space-constrained accessories and sensors. Pin 1 = IO (1-Wire bus interface, open-drain), Pin 2 = VCC (2.8V–3.6V supply), Pin 3 = GND. No internal connections to NC pins - consistent with TSOC variant pin 4–6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2432+T, DS28E10R+T adds hardware SHA-1 and irreversible OTP for true cryptographic binding; compared with MAX32664AETB+, it offers lower BOM cost, smaller size, and simpler integration where fixed-function authentication suffices without MCU overhead.

Availability

DS28E10R+T is available at Aetrix Electronics and suitable for medical sensor authentication, industrial calibration certificate storage, printer cartridge licensing, IoT edge device onboarding, and accessory anti-counterfeiting requiring stable component supply and long-term lifecycle support.

Supply support for DS28E10R+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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and secure ICs for industrial, medical, and communications applications - emphasizing reliability, low power, and security.

The DS28E10R+T belongs to Maxim's 1-Wire secure authenticator product line, engineered specifically for tamper-resistant device identification and cryptographic validation in resource-constrained peripherals and consumables.

FAQ

What is the primary security function of the DS28E10R+T?

The DS28E10R+T performs hardware-accelerated SHA-1 challenge-and-response authentication using FIPS 180-3-compliant cryptography. It generates a 160-bit message authentication code (MAC) based on a secret key, challenge data, and its unique 64-bit ROM ID - enabling secure device identification without exposing secrets on the 1-Wire bus.

Can the DS28E10R+T be reprogrammed after initial OTP write?

No. Each 4-byte block in the DS28E10R+T's 28-byte OTP EPROM becomes permanently write-protected immediately after programming. Once written, data cannot be erased or modified - ensuring calibration values, keys, or usage counters remain immutable throughout the device's lifetime.

What 1-Wire communication speeds does the DS28E10R+T support?

The DS28E10R+T supports two speeds: standard mode at up to 15.4kbps and overdrive mode at up to 125kbps. Overdrive is enabled via Overdrive-Skip ROM or Overdrive-Match ROM commands; recovery requires a reset pulse ≥480μs to return to standard speed.

Is external circuitry required for DS28E10R+T operation?

Yes. The DS28E10R+T's open-drain IO pin requires an external pullup resistor (≤2.2kΩ) to VPUP (2.8V–3.6V). For multidevice or long-cable 1-Wire networks, an active pullup driver like the DS2482-x00 is recommended to meet recovery time (tREC) requirements.

How is the unique 64-bit ROM ID structured in the DS28E10R+T?

The DS28E10R+T's 64-bit ROM ID consists of three fields: an 8-bit family code (0x14 for DS28E10), a 48-bit factory-assigned unique serial number, and an 8-bit CRC-8 calculated over the first 56 bits using polynomial X⁸ + X⁵ + X⁴ + 1 - ensuring error detection during 1-Wire enumeration.