23A640T-I/ST

Memory IC Overview

The Microchip Technology 23A640T-I/ST is a 64 Kbit (8192 x 8-bit) Serial Static Random Access Memory device. It 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. The device interfaces via a standard SPI-compatible serial bus with a maximum clock frequency of 20 MHz. It features low-power CMOS technology, offering standby current as low as 4 µA at +85°C. The memory organization includes 32-byte pages for efficient data handling.

Memory IC Feature Summary

• Supports flexible operating modes including byte read/write, page mode with automatic address incrementation, and sequential mode for continuous array access.

Memory IC Applications

• Microcontroller system data storage
• SPI bus peripheral memory expansion
• Industrial embedded applications

Memory IC Procurement Notes

Verify the specific suffix 'I/ST' corresponds to the Industrial temperature grade (-40°C to +85°C) and TSSOP-8 surface mount package. Confirm the voltage range matches the 1.5V–1.95V specification for the 23A series, distinct from the 23K series. Ensure compatibility with the required SPI protocol and HOLD pin functionality for your design.

Memory IC Selection Notes

Select this component when a low-voltage (1.7V nominal) serial SRAM solution is required for industrial environments. It is suitable for designs needing non-volatile-like speed without the complexity of flash programming, particularly where power consumption in standby is critical. Verify that the host microcontroller supports the necessary SPI clock speeds up to 20 MHz.

Memory IC Part Context

This part belongs to the 23X640 family of 64 Kbit Serial SRAM devices manufactured by Microchip Technology. It shares functional similarities with the 23K640 but differs primarily in its lower operating voltage range. The family is designed for direct interface with popular microcontroller families, including PIC® microcontrollers, providing simple serial access to static RAM.

Memory IC Replacement Considerations

The 23K640T-I/ST is a compatible alternative within the same family, differing only in its higher operating voltage range (2.7V–3.6V). Ensure the system power supply aligns with the selected variant's voltage requirements before substitution.