48L640T-I/MNY

Overview

The Microchip Technology 48L640T-I/MNY is a 64-Kbit Serial EERAM featuring an SRAM core with hidden EEPROM backup. It operates within a voltage range of 2.7V to 3.6V and supports SPI clock frequencies up to 66 MHz. The device provides unlimited read/write cycles for the SRAM array, which is organized as 8,192 x 8 bits. It includes a VCAP pin requiring an external capacitor for power-fail data preservation. The industrial temperature grade (-40°C to +85°C) ensures reliable operation in demanding environments.

Feature Summary

• Combines high-speed serial SRAM with non-volatile EEPROM backup for seamless data retention during power disruptions.
• Supports standard SPI interface with symmetrical read and write timing for efficient data transfer.
• Includes a dedicated HOLD pin to pause serial communication without resetting the current sequence.
• Features internal circuitry that automatically saves and restores data based on monitored supply voltage levels.

Applications

• Data logging systems requiring persistent storage without complex wear-leveling algorithms.
• Industrial control units needing fast access memory with automatic power-loss protection.
• Embedded devices utilizing SPI buses where limited pin count and low standby current are critical.

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging if required by your assembly process. Confirm the 'I' designation matches your operational temperature requirements. Check current availability status as manufacturing lifecycles may change. Ensure your design accommodates the necessary VCAP capacitor value for proper AutoStore functionality.

Selection Notes

Select this component when a solution combining SRAM speed with EEPROM non-volatility is needed without user-managed backup routines. Consider the 8-lead TDFN package for space-constrained surface-mount designs. Evaluate the 66 MHz SPI capability against your master controller's maximum clock speed. Ensure the 2.7V minimum operating voltage aligns with your system's power rail stability.

Part Context

This part belongs to the 48L series of Serial EERAMs from Microchip Technology. These devices are designed to simplify non-volatile memory implementation by handling backup operations internally. The 48L640 specifically offers 64 Kbit capacity, making it suitable for moderate data storage needs in compact embedded applications.

Replacement Considerations

Consult official Microchip documentation for verified cross-reference part numbers. Ensure any substitute maintains compatible SPI command sets and voltage ranges. Verify package pinout compatibility if replacing directly on existing PCB layouts.