Microchip Technology AT25080A-10PI-2.7

Overview

AT25080A-10PI-2.7 from Microchip Technology (formerly Atmel) is a serial SPI EEPROM IC providing 8 Kbit (1024 × 8) nonvolatile memory with hardware/software write protection, 20 MHz max clock rate at 5V, and operation from 2.7V to 5.5V. It serves as system configuration storage in industrial controllers requiring reliable data retention over 100 years and 1 million write cycles.

For engineers reviewing the AT25080A-10PI-2.7 datasheet, AT25080A-10PI-2.7 pinout, AT25080A-10PI-2.7 application, or AT25080A-10PI-2.7 equivalent, key selection criteria include SPI Mode 0/3 compatibility, 32-byte page write capability, block-level write protection (1/4, 1/2, full array), HOLD/CS suspend functionality, and PDIP-8 packaging for through-hole prototyping and legacy industrial PCBs.

Technical Context

The AT25080A-10PI-2.7 implements a synchronous slave SPI interface with separate SI/SO lines, MSB-first data transfer, and op-code–driven command execution (WREN, WRITE, RDSR, WRSR). Its internal architecture includes an 8-bit instruction register and nonvolatile status register with BP0/BP1/ WPEN bits controlling memory segmentation and hardware write enable.

It supports dual-voltage operation (2.7–5.5 V), features self-timed 5 ms max write cycles, and integrates dedicated HOLD and WP pins for real-time communication suspension and hardware-based data lockout-enabling robust operation in noisy industrial environments without external timing circuitry.

Key Specifications

Pinout & Package

AT25080A-10PI-2.7 uses an 8-lead PDIP (Plastic Dual Inline Package), 0.300" wide body, suitable for through-hole mounting and manual rework. Pin 1 is marked by a notch or dot on the package top edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95080-DRMN3TP/K and BR24G08FJ-WE2, the AT25080A-10PI-2.7 uniquely combines HOLD support, 20 MHz performance at 5 V, and PDIP-8 packaging-making it optimal for industrial prototyping, legacy board upgrades, and designs requiring deterministic SPI pause capability.

Availability

AT25080A-10PI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, smart energy meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.

Supply support for AT25080A-10PI-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on reliability, longevity, and embedded system integration.

The AT25080A-10PI-2.7 belongs to Microchip's legacy serial EEPROM product line, designed specifically for industrial and automotive applications demanding robust nonvolatile storage with hardware-assisted data integrity and flexible voltage operation.

FAQ

What is the maximum SPI clock frequency supported by the AT25080A-10PI-2.7?

The AT25080A-10PI-2.7 supports up to 20 MHz SCK frequency when operated at VCC = 5.0 V. At lower supply voltages (e.g., 2.7 V), the maximum clock rate drops to 10 MHz per AC characteristics tables. This ensures timing compliance across its full 2.7–5.5 V operating range while maintaining signal integrity in noise-sensitive environments.

Does the AT25080A-10PI-2.7 require an external erase cycle before writing?

No, the AT25080A-10PI-2.7 does not require a separate erase cycle. All programming operations-including byte and page writes-are fully self-timed and automatically erase and rewrite targeted memory locations. The internal write cycle completes within 5 ms maximum, after which the RDY bit in the status register clears to indicate readiness for the next command.

How is write protection implemented on the AT25080A-10PI-2.7?

The AT25080A-10PI-2.7 implements dual-layer write protection: software-controlled via the status register (BP0/BP1 bits) to lock 1/4, 1/2, or the full memory array, and hardware-enforced via the WP pin when the WPEN bit is set. When WP is low and WPEN = 1, writes to the status register-and thus changes to protection levels-are blocked, preventing accidental reconfiguration.

Can the AT25080A-10PI-2.7 operate reliably at 1.8 V?

No-the AT25080A-10PI-2.7 is specified for 2.7 V to 5.5 V operation only, as indicated by the "−2.7" suffix in its ordering code. For 1.8 V operation, Microchip offers the AT25080A-10PI-1.8 variant, which shares identical functionality but is characterized and guaranteed down to 1.8 V. Using the -2.7 version below 2.7 V may result in undefined behavior or failure to meet timing specifications.

What is the function of the HOLD pin on the AT25080A-10PI-2.7?

The HOLD pin on the AT25080A-10PI-2.7 suspends ongoing SPI communication without resetting the internal address counter or command state. 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. Communication resumes upon deassertion (HOLD high) while SCK remains low, preserving transaction continuity.