Microchip Technology AT25080B-SSHL-B

Overview

AT25080B-SSHL-B from Microchip Technology is an 8-Kbit SPI Serial EEPROM organized as 1,024 × 8 bits, operating from 1.8V to 5.5V with industrial temperature range (−40°C to +85°C), 20 MHz max clock rate at 5V, and 32-byte page write capability. It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, reliable data retention.

For engineers reviewing the AT25080B-SSHL-B datasheet, AT25080B-SSHL-B pinout, AT25080B-SSHL-B application, or AT25080B-SSHL-B equivalent, key selection factors include its SPI Mode 0/3 compatibility, hardware/software write protection (WP pin + STATUS register), 1M write endurance, 100-year data retention, and SOIC-8 packaging with RoHS-compliant green finish.

Technical Context

The AT25080B-SSHL-B implements a synchronous SPI slave interface with fixed MSB-first serial protocol, supporting both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Its internal architecture includes a high-voltage generation circuit for EEPROM programming, address register and counter, and dedicated write protection control logic tied to the STATUS register's WPEN, BP1, and BP0 bits.

It features dual-layer data protection: hardware-level via the dedicated WP pin (active-low, configurable per STATUS register), and software-level via WREN/WRDI commands and block protection (1/4, 1/2, or full array). The HOLD pin enables pause/resume of ongoing SPI transfers without resetting the sequence, while CS-driven power-up reset ensures robust initialization.

Key Specifications

Pinout & Package

AT25080B-SSHL-B is housed in an 8-lead Small Outline Integrated Circuit (SOIC) package with standard JEDEC MS-012AC dimensions (3.9 mm × 4.9 mm × 1.75 mm), RoHS-compliant lead-free finish, and matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95080-DRMN3TP/K and BR24G08FJ-WE2, the AT25080B-SSHL-B delivers superior timing performance (20 MHz vs. 10 MHz/400 kHz), dedicated HOLD functionality for real-time bus arbitration, and broader SPI mode support - making it optimal for high-throughput, multi-slave industrial control designs where deterministic latency and protocol flexibility are critical.

Availability

AT25080B-SSHL-B is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT25080B-SSHL-B 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 leading provider of microcontrollers, analog components, and memory solutions, serving industrial, automotive, and consumer markets with vertically integrated silicon and development tools.

The AT25080B-SSHL-B belongs to Microchip's AT25xxx SPI EEPROM family, designed specifically for robust, low-power nonvolatile storage in resource-constrained embedded systems where reliability, small footprint, and wide voltage operation are mandatory.

FAQ

What is the maximum clock frequency supported by the AT25080B-SSHL-B at 3.3V operation?

The AT25080B-SSHL-B supports up to 10 MHz SCK frequency when operated at 2.5V to 5.5V supply, which includes 3.3V systems. This is specified in Table 4-3 of the datasheet under AC Characteristics. At 1.8V, the maximum clock rate drops to 5 MHz. The device automatically adapts timing margins based on VCC, ensuring reliable communication across its full voltage range without external configuration.

Does the AT25080B-SSHL-B require external pull-up resistors on its SPI lines?

Yes - the AT25080B-SSHL-B requires a pull-up resistor (≤10 kΩ) on the CS pin to ensure proper power-up behavior and prevent spurious writes. While SO is internally tri-stated and SI/SCK are CMOS inputs with negligible leakage, best practice recommends weak pull-ups (e.g., 100 kΩ) on SI and SCK in noisy environments to prevent floating states. The WP and HOLD pins may also benefit from pull-ups depending on system-level protection strategy.

How does the HOLD function interact with an ongoing write cycle in the AT25080B-SSHL-B?

The HOLD function in the AT25080B-SSHL-B suspends serial communication but does not interrupt an active internal write cycle. If a WRITE or WRSR command has already initiated the self-timed 5 ms programming sequence, asserting HOLD will pause subsequent SPI traffic but allow the write to complete autonomously. Once HOLD is deasserted and CS remains low, the device resumes normal SPI operation - however, no new command can be accepted until the BUSY bit clears, confirming write completion.

Can the AT25080B-SSHL-B be used in SPI Mode 3, and what design considerations apply?

Yes, the AT25080B-SSHL-B fully supports SPI Mode 3 (CPOL=1, CPHA=1), where SCK idles high. To use Mode 3, the host MCU must configure its SPI peripheral accordingly, and the SCK idle state must match before and after each CS assertion. The device latches SI on rising SCK edges and outputs SO on falling edges in both Mode 0 and Mode 3 - only the idle polarity differs. No hardware changes are needed; timing parameters remain identical per Table 4-3.

What is the default state of the STATUS register after power-up for the AT25080B-SSHL-B?

At power-up, the AT25080B-SSHL-B enters Standby mode with WEL=0 (write disabled), RDY=0 (ready), and nonvolatile bits (WPEN, BP1, BP0) retaining their last written values. The EEPROM array is shipped with all locations set to 0xFFh. This ensures no unintended writes occur on power application, and the device is immediately ready for a RDSR command to verify protection status before enabling writes via WREN.