Microchip Technology 25LC080AT-I/SN

Overview

25LC080AT-I/SN from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, and 2.5–5.5 V supply range. It supports Industrial temperature (−40°C to +85°C), features hardware write protection via WP pin and status register, and delivers 1,000,000 erase/write cycles for embedded firmware storage in microcontroller-based systems.

For engineers reviewing the 25LC080AT-I/SN datasheet, 25LC080AT-I/SN pinout, 25LC080AT-I/SN application, or 25LC080AT-I/SN equivalent, key selection criteria include SPI clock compatibility up to 10 MHz, page-write capability within 16-byte boundaries, low-power standby current (≤1 μA), and integrated block protection for secure configuration data retention.

Technical Context

The 25LC080AT-I/SN implements a standard SPI Mode 0,0 interface with separate SI and SO lines, requiring CS, SCK, SI, SO, WP, HOLD, VCC, and VSS. Its internal architecture includes a write-enable latch, status register with WIP/WEL/BP bits, and high-voltage generator for EEPROM programming.

It supports sequential read across address boundaries with automatic rollover at 03FFh, and enforces strict page-write alignment-crossing a 16-byte boundary wraps data to the start of the same page. HOLD pin suspension preserves serial state without reinitialization, enabling interrupt servicing during ongoing transfers.

Key Specifications

Pinout & Package

25LC080AT-I/SN is packaged in an 8-lead SOIC (SN) with 1.27 mm pitch, 4.90 mm × 6.00 mm body, and Pb-free RoHS-compliant construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 25LC080AT-I/SN, the PDIP variant offers identical electrical behavior but different mechanical integration, while the AT25080B provides higher speed and broader VCC range at the cost of altered page alignment constraints and vendor-specific command set.

Availability

25LC080AT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control, and IoT edge node identity storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 25LC080AT-I/SN 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

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC080A/B family was designed specifically for reliable, low-power, SPI-compatible nonvolatile storage in resource-constrained embedded systems requiring long-term data integrity and industrial-grade robustness.

FAQ

What is the maximum SPI clock frequency supported by the 25LC080AT-I/SN?

The 25LC080AT-I/SN supports up to 10 MHz SPI clock frequency when VCC is 4.5–5.5 V. At lower supply voltages (2.5–4.5 V), the maximum clock rate decreases to 5 MHz, and at 1.8–2.5 V it drops to 3 MHz. These limits ensure reliable setup/hold timing across operating conditions and are defined in Table 1-2 of the DS21808D datasheet.

Does the 25LC080AT-I/SN require external pull-up resistors on its SPI lines?

The 25LC080AT-I/SN does not require external pull-ups on SI, SCK, or CS lines as these inputs have internal weak pull-downs. However, SO and HOLD are open-drain capable and may need external pull-ups depending on host interface requirements-especially when shared with other devices on the same SPI bus or when using HOLD for precise timing control.

How does the page write limitation affect firmware update routines for the 25LC080AT-I/SN?

The 25LC080AT-I/SN has a fixed 16-byte page size, meaning any page write operation must stay within a single 16-byte boundary (e.g., addresses 0x000–0x00F). Crossing that boundary wraps data to the start of the same page. Firmware update code must therefore align writes to page boundaries and split multi-page updates across discrete write commands to prevent unintended overwrites.

Can the 25LC080AT-I/SN retain data during power loss or brown-out events?

Yes-the 25LC080AT-I/SN includes built-in power-on/off data protection circuitry and a write-enable latch that resets automatically during power transitions. Combined with its >200-year data retention specification and self-timed write cycles, this ensures valid data persistence even during abrupt power loss, provided the host MCU asserts CS high before VCC falls below the minimum operating threshold.

What is the function of the HOLD pin on the 25LC080AT-I/SN, and how should it be used in real-time systems?

The HOLD pin on the 25LC080AT-I/SN pauses ongoing SPI communication without resetting the internal state, allowing the host MCU to service higher-priority interrupts. To use it correctly, HOLD must be asserted while SCK is low; otherwise, the pause takes effect only after the next SCK falling edge. Resuming requires bringing HOLD high while SCK remains low-ensuring deterministic timing control in time-critical applications.