48L512-I/SN

Overview

The Microchip Technology 48L512-I/SN is a 512-Kbit Serial EERAM featuring an SRAM core with hidden EEPROM backup. It provides unlimited read/write cycles for the SRAM array while ensuring nonvolatile data retention through automatic cell-for-cell transfers during power disruptions. The device operates within a voltage range of 2.7V to 3.6V and supports SPI interfaces up to 66 MHz. It includes a 16-byte nonvolatile user space, block write protection, and hibernate mode for low-power applications.

Feature Summary

• Combines high-speed SRAM performance with nonvolatile EEPROM backup for seamless data preservation.
• Supports symmetrical read and write operations without usage limits on the SRAM array.
• Features automatic data transfer to EEPROM upon power loss using external capacitor energy.
• Includes a dedicated 16-byte nonvolatile user space independent of the main memory array.

Applications

• Data logging systems requiring frequent updates with nonvolatile retention
• Configuration storage in industrial controllers
• Real-time clock backup memory
• Embedded systems needing fast access with power-loss safety

Procurement Notes

Verify the specific suffix 'I' indicates the Industrial temperature range (-40°C to +85°C) and 'SN' denotes the 8-lead SOIC package. Confirm that the system design accommodates the required VCAP capacitor (typically 47μF to 100 μF) between pin 3 and ground for proper auto-store functionality. Ensure the host controller supports the required SPI modes and voltage levels.

Selection Notes

Select this component when both high-speed random access and nonvolatile data retention are critical. It is suitable for applications where standard EEPROM write endurance is insufficient or where page-write delays are unacceptable. Consider the 48LM01 variant if 1-Mbit capacity is needed instead of 512-Kbit. Verify that the operating voltage aligns with the 2.7V–3.6V specification.

Part Context

The 48L512 belongs to Microchip's Serial EERAM family, which integrates SRAM and EEPROM technologies. Unlike traditional EEPROMs, it offers unlimited write endurance for the volatile portion while maintaining data integrity across power cycles. This hybrid architecture bridges the gap between fast volatile memory and slow nonvolatile storage.

Replacement Considerations

Public confirmed substitute part numbers: 48LM01-I/SN.

FAQ

How does the device handle data during a power failure?

The device monitors VCC and automatically transfers all SRAM data to the hidden EEPROM backup using energy stored in an external capacitor connected to the VCAP pin when power drops below a threshold.

Is the EEPROM backup accessible to the user?

No, the EEPROM backup is invisible to the user and cannot be accessed independently; it mirrors the SRAM array cell-for-cell and is managed internally by the device.

What is the purpose of the HOLD pin?

The HOLD pin allows the user to pause serial communication mid-sequence without resetting the clock or address counter, resuming operation when the pin is deasserted.