23K640-I/SN

Memory IC Overview

The Microchip Technology 23K640-I/SN 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 signals. The component 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 features an industrial temperature rating from -40°C to +85°C. The device utilizes an 8-lead SOIC package with a width of 3.90 mm.

Memory IC Feature Summary

• Supports flexible operating modes including byte read/write, 32-byte page mode, and sequential mode for efficient data handling.
• Includes a dedicated HOLD pin that allows suspension of serial communication without resetting the internal address pointer or sequence state.
• Features low-power CMOS technology with minimal standby current consumption when deselected.

Memory IC Applications

• Data logging systems requiring non-volatile-like temporary storage with high-speed access.
• Microcontroller-based embedded systems needing additional buffer memory for SPI peripherals.
• Industrial control applications operating within extended temperature environments.

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C) and 'SN' denotes the 8-lead SOIC package. Confirm the '23K' prefix indicates the 2.7V–3.6V supply voltage variant, distinct from the '23A' series which requires lower voltages. Ensure compatibility with the host system's SPI voltage levels before integration.

Memory IC Selection Notes

Select this part when a volatile memory solution is required for fast, random-access data buffering in SPI-enabled designs. It is suitable for applications where data persistence is not critical but rapid read/write cycles are necessary. Consider the 32-byte page size for optimized write operations compared to byte-by-byte writing.

Memory IC Part Context

This component belongs to the 23X640 family of 64-Kbit Serial SRAMs manufactured by Microchip Technology. The family includes variants like the 23A640 for lower voltage applications. The 23K640 specifically targets industrial and automotive-grade environments requiring robust performance across wide temperature ranges while maintaining compatibility with standard microcontroller SPI interfaces.

Memory IC Replacement Considerations

Direct functional substitutes within the same voltage and package constraints include the 23K640-E/SN for automotive temperature ratings. Other members of the 23X640 family may be compatible if voltage and thermal specifications align with the design requirements.

Memory IC FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission to the device when pulled low while SCK is low. This pauses communication without resetting the internal address counter or sequence state. Transitions on SI, SCK, and SO are ignored during this period.

What is the difference between Page mode and Sequential mode?

In Page mode, read/write operations are limited to the addressed 32-byte page, with the internal address counter wrapping within that page. In Sequential mode, the address counter increments continuously across page boundaries, allowing indefinite reading or writing through the entire array.