Microchip Technology 25LC080B-E/P

Overview

25LC080B-E/P from Microchip Technology Inc. is an 8 Kbit SPI Serial EEPROM with 1024 × 8-bit organization, 32-byte page write capability, 10 MHz max clock frequency, and industrial/automotive temperature support (–40°C to +125°C). It operates from 2.5V to 5.5V and delivers 1,000,000 erase/write cycles with >200 years data retention - used for firmware storage, calibration data logging, and configuration parameter retention in automotive control modules.

For engineers reviewing the 25LC080B-E/P datasheet, 25LC080B-E/P pinout, 25LC080B-E/P application, or 25LC080B-E/P equivalent, key selection criteria include page size (32 bytes), HOLD/CS/SO/SI/SCK/WP/VSS/VCC interface compatibility, write-protection granularity (none/¼/½/all), and automotive-grade reliability under extended temperature stress.

Technical Context

The 25LC080B-E/P implements a standard SPI Mode 0,0 or 1,1 interface with separate SI (data in) and SO (data out) lines, requiring CS assertion and SCK synchronization for all operations. Its internal architecture includes a write-enable latch, status register (WIP/WEL/BP0/BP1/WPEN), and page latches enabling burst writes within 32-byte boundaries.

Hardware write protection is controlled jointly by the WP pin and WPEN bit: only when WP = low AND WPEN = 1 are nonvolatile status bits protected. The HOLD pin suspends ongoing serial transfers without resetting the sequence, allowing host interrupt servicing while preserving state across CS deassertion.

Key Specifications

Pinout & Package

25LC080B-E/P is packaged in an 8-lead PDIP (Plastic Dual In-Line Package) with 0.300-inch body width, RoHS-compliant matte tin lead finish, and industry-standard pin layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 25LC080B-E/P, the 25LC080B-I/P offers identical performance at lower cost for non-automotive environments, while the AT25080B-SSHL-T trades HOLD support and automotive qualification for broader voltage operation - making 25LC080B-E/P the sole choice for AEC-Q100-compliant, interrupt-resilient, high-temp applications.

Availability

25LC080B-E/P is available at Aetrix Electronics and suitable for automotive control units, infotainment systems, and ADAS camera modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 25LC080B-E/P 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 25LC080B-E/P belongs to Microchip's 25XX080A/B family of SPI Serial EEPROMs, engineered specifically for reliable, low-power, high-endurance nonvolatile storage in automotive, industrial, and consumer systems demanding extended temperature operation and robust data integrity.

FAQ

What is the maximum clock frequency supported by the 25LC080B-E/P?

The 25LC080B-E/P supports up to 10 MHz clock frequency when VCC is 4.5V to 5.5V. At 2.5V ≤ VCC < 4.5V, the maximum clock drops to 5 MHz, and at 1.8V ≤ VCC < 2.5V it is 3 MHz. These limits are defined in Table 1-2 AC Characteristics and ensure reliable setup/hold timing across voltage and temperature ranges. The 25LC080B-E/P must be operated within these constraints to guarantee correct SPI communication and data integrity.

Does the 25LC080B-E/P require external pull-up resistors on its SPI lines?

The 25LC080B-E/P does not require external pull-ups on SO, SI, or SCK - these pins are actively driven or tri-stated as needed. However, CS and WP are active-low inputs with internal weak pull-ups disabled by default; external pull-ups (typically 4.7 kΩ to VCC) are recommended on CS to prevent spurious selection during power-up and on WP to ensure predictable write-protection behavior unless intentionally grounded. The 25LC080B-E/P datasheet specifies no internal pull-ups exist on these pins.

How does page write operation work in the 25LC080B-E/P?

In the 25LC080B-E/P, a page write transfers up to 32 bytes starting from any address within a 32-byte boundary (e.g., 0000h–001Fh). All bytes must reside in the same page; crossing a boundary wraps data to the start of the current page, overwriting prior content. The CS pin must go high after the last data bit to initiate the internal 5 ms write cycle. The WIP bit in the status register indicates completion. This mechanism enables faster bulk writes than byte-wise programming while enforcing physical page alignment - a key constraint verified in the 25LC080B-E/P functional description.

Can the 25LC080B-E/P be used in a 1.8V system?

No, the 25LC080B-E/P is not rated for 1.8V operation. Its specified VCC range is 2.5V to 5.5V, as confirmed in the Device Selection Table and DC Characteristics section. For 1.8V systems, Microchip offers the 25AA080B variant (1.8–5.5V), which shares the same 32-byte page size and pinout but differs in voltage tolerance and temperature grade. Using 25LC080B-E/P below 2.5V risks unreliable read/write behavior and violates absolute maximum ratings.

What is the function of the HOLD pin on the 25LC080B-E/P?

The HOLD pin on the 25LC080B-E/P pauses an ongoing SPI transaction (read or write) without resetting the internal address counter or instruction state. When pulled low while SCK is low, the device tri-states SO, SI, and SCK inputs are ignored except CS, allowing the host microcontroller to service urgent interrupts. Resuming requires bringing HOLD high while SCK remains low. This feature is explicitly documented in Section 3.6 and Figure 1-1 of the 25LC080B-E/P datasheet and is essential for deterministic real-time system response.