25AA080/SN

Memory IC Overview

The Microchip Technology 25AA080/SN is an 8 Kbit (1024 x 8-bit) Serial Electrically Erasable PROM. It features a low-power CMOS technology with a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 1 MHz in the Industrial temperature range (-40°C to +85°C). The device utilizes a standard SPI-compatible serial bus interface requiring SCK, SI, SO, CS, HOLD, and WP pins. Key electrical characteristics include a typical standby current of 500 nA, a maximum write current of 3 mA, and a self-timed write cycle time of 5 ms max.

Memory IC Feature Summary

• Supports block-level write protection allowing configuration to protect none, one-quarter, one-half, or all memory array segments via status register bits.
• Includes built-in power-on/off data protection circuitry and a write enable latch mechanism to prevent inadvertent writes during operation.
• Provides a Hold pin function that suspends serial communication without resetting the sequence, enabling host servicing of higher priority interrupts.

Memory IC Applications

• Data storage for microcontroller systems requiring non-volatile parameter retention
• Configuration memory for embedded devices utilizing SPI interfaces
• Industrial control applications operating within specified temperature ranges

Memory IC Procurement Notes

Verify component authenticity through authorized Microchip distributors or direct factory channels. Confirm package marking matches the specific ordering suffix SN for the 8-lead SOIC variant. Review the latest datasheet revision for any errata or operational updates prior to finalizing procurement specifications.

Memory IC Selection Notes

Select this component for designs requiring 8 Kbit capacity with SPI compatibility. Ensure the system operates within the 1.8V to 5.5V supply range. Note that this specific part number is not recommended for new designs; consider upgrading to the 25AA080A/B or 25LC080A/B series for enhanced performance and availability.

Memory IC Part Context

This device belongs to the 25XX080 family of 8 Kbit Serial EEPROMs from Microchip Technology. It shares architectural similarities with the 25LC080 and 25C080 variants, differing primarily in minimum supply voltage requirements and supported clock frequencies across various temperature grades.

Memory IC Replacement Considerations

Microchip recommends using the 25AA080A/B or 25LC080A/B series as replacements. These updated parts offer improved electrical specifications while maintaining functional compatibility with the original architecture.

Memory IC FAQ

How does the Write Protect (WP) pin interact with the Status Register?

The WP pin functionality is controlled by the WPEN bit in the Status Register. When WPEN is high, a low level on the WP pin disables writes to the memory array. If WPEN is low, the WP pin function is blocked, allowing writes to the Status Register even if the pin is grounded.

What is the purpose of the HOLD pin during serial communication?

The HOLD pin allows the host to pause transmission to the device mid-sequence without resetting the serial pointer. This enables the host to service higher priority interrupts. Communication resumes when the HOLD pin is brought high while the SCK pin is low.