Analog Devices Inc./Maxim Integrated DS2430A+T&R

Overview

DS2430A+T&R from Analog Devices is a 256-bit 1-Wire EEPROM with integrated 64-bit unique ROM (family code 14h), 64-bit one-time programmable application register, and parasitic power operation. It operates from 2.8V to 5.25V across –40°C to +85°C in TO-92 package and interfaces via single-wire bidirectional bus at up to 14.3 kbps for board identification and calibration storage.

For engineers reviewing the DS2430A+T&R datasheet, DS2430A+T&R pinout, DS2430A+T&R application, or DS2430A+T&R equivalent, key selection criteria include 1-Wire protocol compliance, TO-92 mechanical compatibility, 256-bit EEPROM page structure, application register one-time programming behavior, and parasitic power timing requirements (tPROG, tREC).

Technical Context

The DS2430A+T&R implements a hierarchical 1-Wire protocol requiring ROM function commands (e.g., Skip ROM CCh, Match ROM 55h) before memory access. Its memory architecture includes three distinct sections: 256-bit EEPROM (organized as one 32-byte page), 64-bit one-time programmable application register, and 1-byte status register - each with dedicated scratchpad buffers for write verification.

Communication relies on open-drain signaling with strict timing: Write-0 low time ≥ 60 µs, Read-data sampling window tMSRMIN–tMSRMAX defined relative to tRL, and recovery time tREC ≥ 1 µs after each slot. The device uses improved noise suppression with VTH hysteresis (VHY) and rising-edge hold-off time (tREH) to maintain robustness in multidrop networks.

Key Specifications

Pinout & Package

DS2430A+T&R is supplied in lead(Pb)-free TO-92 package (3-pin, 2.54 mm lead spacing on tape-and-reel). Package dimensions: 3.7 mm × 4.0 mm × 1.5 mm. Pin 1 = Ground, Pin 2 = Data (open-drain 1-Wire I/O), Pin 3 = NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS2430A+T&R, DS2431+T&R provides scalable nonvolatile storage while maintaining full pin and protocol compatibility, whereas DS2432+T&R introduces mandatory security processing overhead and firmware dependencies - making DS2430A+T&R optimal for cost-sensitive, non-secure identity and calibration use cases.

Availability

DS2430A+T&R is available at Aetrix Electronics and suitable for industrial sensor calibration, PCB-level identification, and product revision tagging requiring stable component supply and RoHS-compliant packaging.

Supply support for DS2430A+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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The DS2430A+T&R belongs to Analog Devices' 1-Wire EEPROM product line, designed specifically for low-pin-count, parasitically powered identification and configuration storage in space-constrained embedded systems.

FAQ

What is the function of Pin 3 on the DS2430A+T&R?

Pin 3 on the DS2430A+T&R is a No Connect (NC) terminal - it is internally unconnected and must remain electrically floating on the PCB. This pin has no role in power delivery, communication, or functionality. Connecting Pin 3 to ground, VDD, or any other net may cause undefined behavior or damage. The DS2430A+T&R operates solely using Pin 1 (Ground) and Pin 2 (Data) in its TO-92 package.

Can the DS2430A+T&R be used with a 3.3V microcontroller?

Yes, the DS2430A+T&R supports operation from 2.8V to 5.25V, making it fully compatible with 3.3V microcontrollers. Its parasitic power architecture draws energy directly from the DATA line during communication, eliminating the need for a separate VDD supply. When interfacing with a 3.3V MCU, ensure the external pullup resistor is sized appropriately (typically 1.5–2.2 kΩ) to meet VIH/VIL thresholds and maintain reliable 1-Wire timing margins for the DS2430A+T&R.

How does the DS2430A+T&R handle multiple devices on the same 1-Wire bus?

The DS2430A+T&R supports multidrop operation via standardized 1-Wire ROM commands: Search ROM (F0h) discovers all device IDs, Match ROM (55h) selects a specific DS2430A+T&R by its 64-bit ROM, and Skip ROM (CCh) addresses all devices simultaneously. Its built-in multidrop controller ensures deterministic arbitration and collision resolution. However, simultaneous EEPROM writes require careful timing coordination - the DS2430A+T&R does not support broadcast write-protect or atomic group operations.

Is the application register on the DS2430A+T&R truly one-time programmable?

Yes - the 64-bit application register on the DS2430A+T&R is physically one-time programmable. Once data is copied from the register scratchpad to the application register using the Copy & Lock command (5Ah), the internal lock mechanism permanently disables further writes. Subsequent attempts to write result in no change to stored data, and the status register reflects this by clearing its two LSBs (from FFh to FCh). This behavior is irreversible and guaranteed by the silicon design of the DS2430A+T&R.

What is the minimum pullup resistor value recommended for reliable DS2430A+T&R operation?

The recommended pullup resistor range for the DS2430A+T&R is 0.3 kΩ to 2.2 kΩ, depending on bus capacitance and speed requirements. For single-device operation at standard speed (14.3 kbps), a 1.5–2.2 kΩ resistor with VPUP ≥ 4.0V ensures sufficient current for parasitic power during EEPROM write cycles (tPROG). Lower values (e.g., 0.3–0.5 kΩ) are advised for multidrop buses or low-voltage conditions but require active pullup circuitry to avoid excessive static current - verified in DS2430A+T&R characterization data.