AT25128-10PC

Memory IC Overview

The AT25128-10PC is a serial electrically-erasable programmable read-only memory (EEPROM) with a storage capacity of 131,072 bits organized as 16,384 words of 8 bits each. It operates via a 3-wire Serial Peripheral Interface (SPI) compatible with modes 0 and 3. The device supports a maximum clock frequency of 3 MHz and functions within a supply voltage range of 4.5V to 5.5V. It features self-timed write cycles with a typical duration of 5 ms and includes block write protection capabilities.

Memory IC Feature Summary

• Supports SPI Modes 0 (0,0) and 3 (1,1) for synchronous data transfer
• Provides hardware and software data protection via Write Protect (WP) pin and status register instructions
• Enables selective array protection allowing the top quarter, top half, or entire memory to be locked against writes
• Includes a HOLD pin to suspend serial communication without resetting the internal sequence

Memory IC Applications

• Industrial control systems requiring low-power non-volatile data storage
• Commercial applications utilizing 6800-type microcontrollers with SPI interfaces
• Systems needing secure configuration parameter retention with block-level write protection

Memory IC Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature range. Confirm that the standard 5.0V operation variant aligns with the system power supply constraints. Ensure compatibility with existing SPI controller configurations regarding clock polarity and phase settings before finalizing procurement.

Memory IC Selection Notes

Select this component when a 128K-bit serial EEPROM is required with robust hardware write protection features. It is suitable for designs operating strictly at 5V logic levels where industrial or commercial temperature ranges are sufficient. Consider alternative voltage variants if the system requires lower supply voltages such as 2.7V or 1.8V operation.

Memory IC Part Context

This part belongs to the AT25128/256 family of serial EEPROMs manufactured originally by Atmel Corporation, now under Microchip Technology. The family offers various package options including PDIP, SOIC, TSSOP, and Leadless Array packages. The -10PC suffix specifically denotes the Industrial temperature range (-40°C to +85°C) and the 8-pin Plastic Dual In-line Package (PDIP).

Memory IC Replacement Considerations

AT25128-10CI

Memory IC FAQ

How does the WP pin function in conjunction with the WPEN bit?

Hardware write protection is enabled when the WP pin is held low and the WPEN bit in the status register is set to '1'. If the WPEN bit is '0', the WP pin function is disabled regardless of its state.

What happens if an invalid op-code is received during serial communication?

If an invalid op-code is received, no data is shifted into the device, and the serial output pin remains in a high impedance state until the falling edge of the Chip Select (CS) pin is detected again.