48L640T-I/SN

Overview

The Microchip Technology 48L640T-I/SN 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 8K x 8 bits. Electrical characteristics include a maximum active current of 5 mA and standby current of 200 μA at 85°C. The industrial temperature grade ensures functionality from -40°C to +85°C.

Feature Summary

• Combines high-speed serial SRAM with non-volatile EEPROM backup for data retention during power loss
• Supports symmetrical read and write operations without cell usage limits
• Includes automatic power-disruption detection and data transfer mechanisms
• Features a dedicated hold pin to pause serial communication sequences

Applications

• Data logging systems requiring persistent storage with high write endurance
• Industrial control applications needing fast access and non-volatile configuration retention
• Embedded systems utilizing SPI interfaces for memory expansion
• Battery-powered devices requiring low-power hibernation modes

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging if required by assembly equipment. Confirm the 'I' designation matches the intended industrial temperature range specifications. Ensure the system design accommodates the external VCAP capacitor requirements for proper auto-store functionality. Check for end-of-life status or obsolescence notices before finalizing procurement plans.

Selection Notes

Select this component when both high-speed volatile access and non-volatile data persistence are required in a single package. It is suitable for designs where traditional EEPROM write speeds are insufficient. Consider the 8-lead SOIC package constraints and the necessity of an external capacitor on the VCAP pin. Evaluate the 66 MHz SPI interface capability against the master controller's performance.

Part Context

This part belongs to the 48LXXX series of Serial EERAMs from Microchip Technology. It shares architectural similarities with other devices in the family but offers specific capacity and speed characteristics. The T/I/SN suffix combination defines the reel packaging, industrial temperature rating, and surface-mount SOIC package type respectively.

Replacement Considerations

Direct replacements may include other 48LXXX series variants with different capacities or packaging options. Verify compatibility regarding the SPI protocol, voltage levels, and physical footprint. Cross-reference with Microchip's official comparable part tools for validated alternatives.