Microchip Technology AT25F1024N-10SI-2.7

Overview

AT25F1024N-10SI-2.7 from Atmel (now Microchip) is a 1-Mbit (131,072 × 8) serial Flash memory IC optimized for low-voltage embedded systems. It supports SPI Modes 0 and 3, operates at up to 20 MHz, features hardware write protection via WP pin, and delivers 10,000 program/erase cycles with sector-level erase (1 second/sector) and byte/page programming (60 µs/byte typical). It is used in firmware storage for industrial microcontroller-based systems requiring reliable nonvolatile code/data retention.

For engineers reviewing the AT25F1024N-10SI-2.7 datasheet, AT25F1024N-10SI-2.7 pinout, AT25F1024N-10SI-2.7 application, or AT25F1024N-10SI-2.7 equivalent, key selection criteria include its 2.7–3.6 V supply range, JEDEC SOIC-8 package, 85°C industrial temperature rating, self-timed sector erase, and SPI-compatible interface with HOLD/CS/WP control logic.

Technical Context

The AT25F1024N-10SI-2.7 implements a synchronous SPI slave interface with separate SI/SO pins, MSB-first data transfer, and fixed 8-bit instruction register. It uses an internal status register (RDY/WEN/BP0/BP1/WPEN bits) to manage readiness, write enable state, and four-level block write protection (top 1/4, top 1/2, or full array).

All write operations - PROGRAM, SECTOR ERASE, CHIP ERASE, and WRSR - require prior WREN instruction and are self-timed; only RDSR remains functional during internal cycles. The device supports continuous READ with address rollover and suspends communication via HOLD pin without resetting the sequence.

Key Specifications

Pinout & Package

AT25F1024N-10SI-2.7 is housed in an 8-lead JEDEC SOIC package (8S1, 0.150" wide body, gull-wing leads), compliant with industrial thermal and mechanical requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L1006EZN-12G and SST25VF010A-20-4I-SAE, AT25F1024N-10SI-2.7 uniquely combines HOLD pin support, 1-second sector erase predictability, and Atmel's documented BP0/BP1 sector-lock mapping - making it optimal for interrupt-safe, safety-aware firmware storage in industrial controllers.

Availability

AT25F1024N-10SI-2.7 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, smart energy meter bootloaders, automotive body control module log memory, and embedded system parameter retention requiring stable component supply and long-term lifecycle assurance.

Supply support for AT25F1024N-10SI-2.7 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

Atmel Corporation, now part of Microchip Technology, is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and security ICs for industrial, automotive, and consumer applications.

The AT25F1024N-10SI-2.7 belongs to Atmel's AT25F serial Flash product line, designed specifically for low-voltage, SPI-based firmware and configuration storage in resource-constrained embedded systems demanding reliability and industrial temperature operation.

FAQ

What is the memory organization of the AT25F1024N-10SI-2.7?

The AT25F1024N-10SI-2.7 contains 1,048,576 bits organized as 131,072 words of 8 bits each (131,072 × 8). It is divided into four 32 KB sectors (totaling 128 KB), with 128 pages per sector. This structure supports efficient sector-level erase and page-mode programming, essential for firmware update partitioning in the AT25F1024N-10SI-2.7.

Does the AT25F1024N-10SI-2.7 support both SPI Mode 0 and Mode 3?

Yes, the AT25F1024N-10SI-2.7 explicitly supports SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in its official datasheet. This dual-mode compatibility allows seamless integration with diverse microcontrollers - including legacy 6800-series derivatives and modern ARM Cortex-M devices - without requiring protocol translation hardware in the AT25F1024N-10SI-2.7 interface.

What is the function of the HOLD pin on the AT25F1024N-10SI-2.7?

The HOLD pin on the AT25F1024N-10SI-2.7 suspends ongoing SPI communication without resetting the internal state or command sequence. When asserted low while SCK is low, it places SO in high-impedance and ignores SI inputs, allowing the host MCU to service interrupts or perform other tasks. Resuming requires bringing HOLD high while SCK remains low - a feature critical for deterministic timing in real-time systems using the AT25F1024N-10SI-2.7.

How does write protection work on the AT25F1024N-10SI-2.7?

Write protection on the AT25F1024N-10SI-2.7 operates through two independent mechanisms: software-controlled Block Protect (BP0/BP1) bits in the status register, which lock top 1/4, top 1/2, or full memory array; and hardware protection via the WP pin, enabled only when WPEN = 1. When WP is low and WPEN = 1, status register writes (including BP bits) are blocked - a dual-layer safeguard implemented directly in the AT25F1024N-10SI-2.7 silicon.

What is the typical sector erase time for the AT25F1024N-10SI-2.7?

The typical sector erase time for the AT25F1024N-10SI-2.7 is 1.1 seconds per 32 KB sector, as specified in the AC Characteristics table of its datasheet. This value is characterized across the full operating voltage (2.7–3.6 V) and temperature (−40°C to +85°C) range. Because erase is self-timed and internally managed, no external timing circuitry is required - a key design simplification inherent to the AT25F1024N-10SI-2.7 architecture.