25AA080B-I/ST

Memory IC Overview

The Microchip Technology 25AA080B-I/ST is an 8 Kbit (1024 x 8-bit) Serial Electrically Erasable PROM featuring a 32-byte page size. It operates via a standard SPI-compatible serial bus with a maximum clock frequency of 10 MHz and supports a supply voltage range of 1.8V to 5.5V. The device provides high reliability, including 1,000,000 erase/write cycles and data retention exceeding 200 years. It incorporates built-in write protection mechanisms and ESD protection greater than 4000V. The component is housed in an 8-lead TSSOP package and is rated for industrial temperature ranges from -40°C to +85°C.

Memory IC Feature Summary

• Supports sequential read operations and self-timed erase/write cycles up to 10 MHz.
• Includes programmable block write protection allowing selective array segment locking.
• Features hardware write-protect pin functionality combined with status register control.
• Provides hold capability to pause serial communication without resetting the sequence.

Memory IC Applications

• Data storage for microcontroller system parameters
• Configuration memory for embedded devices
• Calibration data retention in industrial sensors

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm that the 'I' designation aligns with the intended industrial operating environment. Ensure compatibility with the host controller's SPI voltage levels and timing requirements before finalizing procurement specifications.

Memory IC Selection Notes

Select this component when a low-voltage operation down to 1.8V is required alongside standard SPI interface compatibility. The 32-byte page size offers efficient bulk writing compared to smaller page variants. Consider the TSSOP package dimensions if surface-mount space constraints are a primary design factor.

Memory IC Part Context

This part belongs to the 25XX080A/B family of 8 Kbit Serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25LC080 series but differs in minimum operating voltage specifications. The 'B' variant specifically denotes the expanded 32-byte page buffer capacity.

Memory IC Replacement Considerations

The datasheet lists 25AA080A-I/ST as a related variant within the same family, distinguished primarily by its 16-byte page size rather than direct functional equivalence.

Memory IC FAQ

How does the HOLD pin function during active communication?

The HOLD pin allows the user to pause serial communication mid-sequence. When pulled low while SCK is low, it places inputs in a high-impedance state. Communication resumes when the pin is brought high again while SCK is low.

What determines the write protection status of the memory array?

Write protection is determined by the Block Protection (BP1 and BP0) bits in the Status Register, which can lock none, one-quarter, one-half, or all of the memory array.