23K640T-E/ST

Memory IC Overview

The Microchip Technology 23K640T-E/ST is a 64-Kbit (8192 x 8-bit) low-power CMOS Serial SRAM device. It interfaces via a standard SPI-compatible serial bus requiring SCK, SI, SO, and CS lines. The device supports a maximum clock frequency of 20 MHz at VCC = 3.0V. It operates within a supply voltage range of 2.7V to 3.6V and supports Industrial (-40°C to +85°C) and Automotive (-40°C to +125°C) temperature ranges. The part is housed in an 8-lead TSSOP package.

Memory IC Feature Summary

• Supports flexible operating modes including Byte, Page (32-byte page), and Sequential read/write operations.
• Includes a HOLD pin that allows suspension of serial communication without resetting the sequence or retransmitting data.
• Features low-power CMOS technology with standby current as low as 4 µA maximum at +85°C.

Memory IC Applications

• Data logging applications requiring non-volatile-like storage characteristics with high endurance.
• Embedded systems utilizing microcontrollers with limited I/O pins for peripheral expansion.
• Automotive electronic control units requiring components compliant with extended temperature ranges.

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms Automotive qualification and '+125°C' rating. Confirm 'ST' indicates the 8-lead TSSOP package type. Ensure the order matches the required voltage range of 2.7V to 3.6V. Check RoHS compliance status if required by your manufacturing standards. Validate lead-free marking on the component body.

Memory IC Selection Notes

Select this component when a small footprint serial memory is needed for temporary data storage. The TSSOP package suits surface-mount designs with space constraints. The Automotive grade ensures reliability in harsh thermal environments. Consider the 32-byte page size for efficient block writes. Verify SPI compatibility with the host controller's interface capabilities.

Memory IC Part Context

This device belongs to the 23X640 family of 64-Kbit Serial SRAMs from Microchip Technology. It shares functional similarities with the 23A640 but differs in supply voltage requirements and temperature ratings. The family is designed for simple integration into SPI-based architectures, offering a cost-effective alternative to parallel SRAMs for low-density storage needs.

Memory IC Replacement Considerations

The 23K640I/ST serves as the Industrial temperature variant of this component. Cross-referencing with other 64-Kbit SPI SRAMs requires verifying voltage compatibility and package dimensions. Ensure any substitute maintains the same pinout and SPI command set for direct replacement.