23A640-I/SN

Memory IC Overview

The Microchip Technology 23A640-I/SN is a 64 Kbit Serial SRAM device featuring an SPI-compatible serial bus interface. It utilizes low-power CMOS technology with an 8192 x 8-bit organization and a 32-byte page size. The component operates within a supply voltage range of 1.5 V to 1.95 V and supports industrial temperature ranges from -40°C to +85°C. It offers flexible operating modes including byte, page, and sequential read/write operations, along with a HOLD pin for pausing transmission.

Memory IC Feature Summary

• Supports flexible operating modes including byte, page, and sequential access via SPI interface
• Features a HOLD pin to suspend transmission without resetting the serial sequence
• Utilizes low-power CMOS technology for reduced current consumption
• Provides high reliability with data retention capabilities

Memory IC Applications

• Microcontroller system memory expansion
• Data logging applications requiring fast random access
• Embedded systems needing non-volatile-like temporary storage
• Industrial control interfaces

Memory IC Procurement Notes

Verify the specific suffix 'I' indicates the Industrial temperature grade (-40°C to +85°C) and 'SN' denotes the SOIC-8 package. Confirm the supply voltage requirements align with the 1.5 V to 1.95 V range specified for the 23A640 variant. Ensure compatibility with the host microcontroller's SPI protocol and voltage levels before integration.

Memory IC Selection Notes

Select this component when a low-voltage (1.7V nominal) serial SRAM is required for high-speed data buffering in industrial environments. Compare against the 23K640 if a higher supply voltage (2.7V-3.6V) is available. Consider the 32-byte page size for write efficiency and the HOLD functionality for interrupt handling during SPI communication.

Memory IC Part Context

This part belongs to the 23X640 family of 64 Kbit Serial SRAMs from Microchip Technology. It shares functional similarities with the 23K640 but differs primarily in its lower operating voltage range. The family is designed for direct interfacing with popular microcontroller families, including PIC® microcontrollers, offering a compact solution for serial memory needs.

Memory IC Replacement Considerations

The 23K640 is a functional substitute within the same family, differing only in the supported supply voltage range (2.7V-3.6V vs. 1.5V-1.95V). Verify that the target application can provide the appropriate voltage level for the replacement part.