23K640-E/ST

Memory IC Overview

The Microchip Technology 23K640-E/ST is a 64 Kbit (8192 x 8-bit) Serial SRAM device utilizing low-power CMOS technology. It interfaces via a standard SPI-compatible serial bus with a maximum clock frequency of 20 MHz. The supply voltage range is 2.7 V to 3.6 V, supporting read currents up to 10 mA at 20 MHz and standby current as low as 4 µA at +85°C. The component operates within an extended temperature range of -40°C to +125°C and is housed in an 8-lead SOIC package.

Memory IC Feature Summary

• Supports flexible operating modes including byte, page, and sequential access for efficient data handling.
• Includes a dedicated HOLD pin to suspend serial communication without resetting the sequence or address pointer.
• Features high reliability with ESD protection on all pins and data retention capabilities down to 1.2 V.

Memory IC Applications

• Data logging systems requiring non-volatile-like temporary storage with fast access.
• Microcontroller-based embedded designs needing additional RAM via SPI interface.
• Automotive electronics operating within extended temperature environments.

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and 'ST' denotes the 8-lead SOIC package. Confirm RoHS compliance and lead-free status through official manufacturer documentation prior to integration. Ensure voltage levels match the 2.7V to 3.6V operational range for reliable performance.

Memory IC Selection Notes

Select this component when an SPI interface is preferred over parallel buses to save I/O pins. The 23K640-E/ST is suitable for applications requiring moderate capacity with low standby power. Consider the 32-byte page size for write operations and the availability of sequential mode for continuous data streams. Verify that the host microcontroller supports the required SPI clock speeds and protocol timing.

Memory IC Part Context

This device belongs to the 23X640 family of Serial SRAMs from Microchip Technology. It shares functional similarities with the 23A640 but differs in supply voltage requirements, with the 23K640 supporting higher voltages (2.7V–3.6V) compared to the 23A640 (1.5V–1.95V). Both variants offer identical memory organization and interface protocols.

Memory IC Replacement Considerations

The 23K640-I/ST serves as a direct replacement for industrial temperature range applications (-40°C to +85°C). Other packages such as PDIP (P) or TSSOP (ST) are available within the same electrical specification family.