Microchip Technology AT25020A-10TI-2.7

Overview

AT25020A-10TI-2.7 from Atmel (now Microchip) is a 2-kbit SPI serial EEPROM organized as 256 words × 8 bits, operating from 2.7V to 5.5V with 20 MHz max clock rate at 5V, 8-byte page write capability, and hardware/software write protection. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules requiring low-voltage operation and automotive-grade reliability.

For engineers reviewing the AT25020A-10TI-2.7 datasheet, AT25020A-10TI-2.7 pinout, AT25020A-10TI-2.7 application, or AT25020A-10TI-2.7 equivalent, key selection criteria include VCC range compatibility (2.7–5.5V), TSSOP-8 package footprint, SPI Mode 0/3 support, block write protection granularity, and 1 million endurance cycles for embedded firmware parameter retention.

Technical Context

The AT25020A-10TI-2.7 implements a synchronous SPI slave interface with dedicated SI/SO pins, CS-driven selection, and HOLD/ WP control lines. Its internal architecture includes an 8-bit instruction register, status register with BP1/BP0 protection bits, and automatic address incrementing during sequential reads.

It supports self-timed internal write cycles (≤5 ms), requires WREN before WRITE, and allows suspension of ongoing transfers via HOLD while maintaining sequence state. Block protection covers 1/4, 1/2, or full array based on nonvolatile BP bits programmed via WRSR.

Key Specifications

Pinout & Package

AT25020A-10TI-2.7 is supplied in an 8-lead TSSOP package (JEDEC MO-153, 3.0 mm × 4.4 mm body, 0.65 mm pitch), optimized for automated assembly and thermal performance in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95256-DWDW3TP/K and BR25L2000FJ-WE2, AT25020A-10TI-2.7 delivers optimal balance of 2.7V compatibility, 20 MHz speed, and industrial temperature range - making it preferred for mixed-voltage embedded systems where density and ECC are secondary to voltage flexibility and timing performance.

Availability

AT25020A-10TI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical device configuration storage, and smart meter firmware metadata requiring stable component supply across extended product lifecycles.

Supply support for AT25020A-10TI-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

Microchip Technology (formerly Atmel) is a global semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions for industrial, automotive, and consumer markets.

The AT25020A-10TI-2.7 belongs to the AT25xxx family of SPI EEPROMs designed for robust, low-voltage nonvolatile storage in resource-constrained embedded systems requiring guaranteed data integrity and long-term reliability.

FAQ

What is the maximum clock frequency supported by AT25020A-10TI-2.7?

The AT25020A-10TI-2.7 supports up to 20 MHz SCK frequency at VCC = 5.0V, 10 MHz at VCC = 2.7–3.6V, and 5 MHz at VCC = 1.8–2.7V. These values are specified in Table 4 of the datasheet and reflect guaranteed AC timing across the full industrial temperature range (−40°C to +85°C). The AT25020A-10TI-2.7 must operate within these limits to ensure reliable command execution and data validity.

Does AT25020A-10TI-2.7 require an external erase cycle before writing?

No, the AT25020A-10TI-2.7 performs automatic erase-before-write internally during each self-timed write cycle. No separate erase command or external timing is needed - the device handles cell conditioning transparently upon receipt of a valid WRITE instruction after WREN. This eliminates host software complexity and guarantees data consistency in the AT25020A-10TI-2.7's memory array.

How does the HOLD pin function during an active SPI transaction in AT25020A-10TI-2.7?

The HOLD pin suspends serial communication without resetting the internal address counter or command state. When asserted low while SCK is low, the AT25020A-10TI-2.7 places SO in high-impedance and ignores SI inputs until HOLD is deasserted (high) with SCK still low. This preserves the exact position in multi-byte reads/writes, enabling CPU interrupt servicing or bus arbitration in the AT25020A-10TI-2.7's interface.

What protection mechanisms prevent unintended writes to AT25020A-10TI-2.7?

The AT25020A-10TI-2.7 implements three independent protections: (1) WP pin hardware lock, (2) WREN instruction requirement before any WRITE/WRSR, and (3) status register BP0/BP1 bits enabling 1/4, 1/2, or full-array software-defined write blocking. All three must be satisfied for a write to succeed - if WP is low, no write occurs even if WREN is set and BP bits permit access. This layered defense ensures robust data integrity in the AT25020A-10TI-2.7.

Is AT25020A-10TI-2.7 compatible with SPI Mode 3 (CPOL=1, CPHA=1)?

Yes, the AT25020A-10TI-2.7 explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as stated in its Features section. In Mode 3, data is sampled on the falling edge of SCK and shifted out on the rising edge - the AT25020A-10TI-2.7's timing specifications accommodate this polarity/phase combination across its full voltage and temperature range, ensuring interoperability with diverse host controllers.