Microchip Technology 25LC080CT-I/SN

Overview

25LC080CT-I/SN from Microchip Technology is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 16-byte page size, and industrial temperature range (−40°C to +85°C). It operates from 2.5V to 5.5V, supports up to 10 MHz clock frequency, and features hardware write protection via WP pin and STATUS register control. It is used in microcontroller-based systems for nonvolatile parameter storage, calibration data retention, and firmware configuration.

For engineers reviewing the 25LC080CT-I/SN datasheet, 25LC080CT-I/SN pinout, 25LC080CT-I/SN application, or 25LC080CT-I/SN equivalent, key selection criteria include SPI interface timing compliance at 10 MHz, 16-byte page write capability, −40°C to +85°C industrial operation, and hardware/software write protection granularity (none/¼/½/all array).

Technical Context

The 25LC080CT-I/SN implements a standard SPI Mode 0,0 (CPOL = 0, CPHA = 0) interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, SI, SO, WP, HOLD, and VCC/VSS. Its internal architecture includes a 1024-byte EEPROM array, page latches, HV generator for write/erase, and a status register with WIP, WEL, BP0/BP1, and WPEN bits.

Write operations require explicit WREN instruction followed by WRITE command; page writes are limited to 16 bytes within a single physical page (000h–00Fh, 010h–01Fh, etc.). The HOLD pin suspends ongoing SPI transfers without resetting the sequence, enabling interrupt servicing while preserving communication state.

Key Specifications

Pinout & Package

25LC080CT-I/SN is packaged in an 8-lead SOIC (SN) with 150-mil body width, RoHS-compliant matte tin finish, and standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25AA080CT-I/SN and 25LC080DT-I/SN, the 25LC080CT-I/SN provides optimal balance of 2.5V minimum supply robustness and 16-byte page simplicity for cost-sensitive industrial controllers where 1.8V operation is unnecessary and page-crossing logic is undesirable.

Availability

25LC080CT-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 25LC080CT-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC080C/D family was designed specifically for reliable, low-power SPI EEPROM storage in resource-constrained embedded systems - emphasizing ease of integration, data integrity, and extended temperature operation.

FAQ

What is the maximum SPI clock frequency supported by the 25LC080CT-I/SN?

The 25LC080CT-I/SN supports up to 10 MHz clock frequency when VCC is 4.5V to 5.5V, 5 MHz at 2.5V to <4.5V, and 3 MHz at 1.8V to <2.5V (though 1.8V operation is outside its specified VCC range). This allows high-speed configuration reads in time-critical boot sequences. The 25LC080CT-I/SN meets all AC timing requirements including setup/hold times and clock edge alignment at these rates.

Does the 25LC080CT-I/SN require external pull-up resistors on its SPI lines?

The 25LC080CT-I/SN does not require external pull-ups on SI, SO, or SCK - these pins are actively driven. However, CS, WP, and HOLD are CMOS inputs with no internal pull-ups; external pull-ups (typically 4.7kΩ to VCC) are recommended for robust noise immunity in noisy industrial environments. The 25LC080CT-I/SN datasheet specifies VIH/VIL thresholds that assume clean signal transitions.

How does page write operation work in the 25LC080CT-I/SN?

The 25LC080CT-I/SN has a 16-byte page buffer. A page write sends up to 16 bytes starting at an address aligned to a 16-byte boundary (e.g., 0x000, 0x010). If the address or byte count crosses the boundary (e.g., writing 16 bytes starting at 0x00F), data wraps to the start of the same page. The 25LC080CT-I/SN completes the internal write only after CS goes high following the last data bit.

Can the 25LC080CT-I/SN be used in automotive applications?

The 25LC080CT-I/SN is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). For under-hood or dashboard applications requiring E-grade qualification, Microchip's 25LC080CT-E/SN or 25LC080DT-E/SN variants are specified. Using the 25LC080CT-I/SN in automotive contexts may violate thermal derating requirements and void warranty.

What happens to the 25LC080CT-I/SN during power-up?

At power-up, the 25LC080CT-I/SN enters Standby mode (SO high-Z, CS ignored until first low transition), resets the write enable latch (disabling writes), and initializes internal logic. No data corruption occurs because the write enable latch is cleared and the STATUS register defaults to unprotected state. This behavior ensures safe initialization without external reset sequencing - a key reliability feature of the 25LC080CT-I/SN.