23K640-E/SN

Memory IC Overview

The Microchip Technology 23K640-E/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. Operating voltage ranges from 2.7V to 3.6V. It features a 32-byte page size and includes a HOLD pin for pausing communication. The device 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 read/write, 32-byte page mode, and sequential mode.
• Includes a dedicated HOLD input pin that suspends serial communication without resetting the sequence.
• Features low-power CMOS technology with defined standby current limits.
• Complies with RoHS standards and is halogen-free.

Memory IC Applications

• Data logging systems requiring non-volatile-like temporary storage
• Microcontroller peripheral memory expansion
• Automotive electronic control units (ECUs)
• Industrial sensor data buffering

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and 'SN' indicates the SOIC-8 package. Confirm the datasheet revision matches the required electrical characteristics. Ensure the source document explicitly lists this part number as available from authorized distributors. Check for any recent Product Change Notifications (PCN) affecting packaging or materials.

Memory IC Selection Notes

Select this component when an SPI interface is preferred over parallel buses to save microcontroller pins. The 23K640-E variant is necessary for environments exceeding industrial temperature limits. Compare power consumption requirements against the specified standby and active currents. Consider the 32-byte page size for write efficiency compared to byte-only operations.

Memory IC Part Context

This device belongs to the 23X640 family of Serial SRAMs manufactured by Microchip Technology. It shares architectural similarities with the 23A640 but differs in supply voltage requirements. The family utilizes a common instruction set and pinout across PDIP, SOIC, and TSSOP packages, facilitating design flexibility.

Memory IC Replacement Considerations

The 23K640-I/SN serves as a functional substitute if the application does not require operation above +85°C. Both parts share identical pinouts, instructions, and electrical timing characteristics within their respective temperature ranges.

Memory IC FAQ

How does the HOLD pin function during a serial transaction?

The HOLD pin allows the host to pause transmission mid-sequence. When pulled low while SCK is low, it tri-states the SO line and ignores transitions on SI and SCK until pulled high again.

What happens to the internal address counter in Page Mode?

In Page Mode, the internal address pointer automatically increments after each byte transfer. If the page boundary is reached, the counter wraps back to the start of the same page.