23K640-E/SNVAO

Memory IC Overview

The Microchip Technology 23K640-E/SNVAO is a 64-Kbit (8192 x 8-bit) low-power CMOS Serial SRAM device. 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. It features a 32-byte page size, HOLD pin functionality for pausing communication, and flexible operating modes including Byte, Page, and Sequential access. The component is qualified to AEC-Q100 standards for automotive applications and operates within an extended temperature range of -40°C to +125°C.

Memory IC Feature Summary

• Supports flexible memory access through Byte, Page, and Sequential operating modes selectable via the STATUS register.
• Includes a dedicated HOLD input pin that suspends serial communication without resetting the internal address pointer or requiring sequence retransmission.
• Complies with AEC-Q100 automotive qualification standards for high reliability in demanding environments.
• Operates on a simple three-wire SPI interface (SCK, SI, SO) controlled by Chip Select, minimizing microcontroller pin usage.

Memory IC Applications

• Embedded systems requiring external data buffering where MCU internal RAM is insufficient.
• Automotive electronic control units (ECUs) needing reliable volatile storage under extended temperature conditions.
• Industrial data logging devices caching sensor readings prior to transmission.
• Portable medical instruments utilizing low-power static random access memory for temporary data retention.

Memory IC Procurement Notes

Verify the specific suffix 'VAO' against official Microchip documentation to confirm it denotes a valid automotive-grade variant or specific packaging configuration. Ensure the ordering part number matches the required temperature grade and package type. Cross-reference the datasheet revision history for any recent changes to electrical characteristics or pin definitions before finalizing procurement specifications.

Memory IC Selection Notes

Select this component when an SPI interface is preferred over parallel buses to save PCB space and I/O pins. Choose the 23K640-E variant specifically for applications requiring operation up to +125°C ambient temperature. Consider the 32-byte page mode for efficient sequential writes. Verify that the host microcontroller supports the required SPI clock speeds and voltage levels compatible with the 2.7V to 3.6V supply range.

Memory IC Part Context

This device belongs to the 23X640 family of Serial SRAMs from Microchip Technology. The family includes variants like the 23A640 which operates at lower voltages (1.5V-1.95V). The 23K640 series is designed to replace parallel SRAMs in space-constrained designs while offering faster access than EEPROMs. It serves as a drop-in software compatible solution for applications previously using larger parallel memory chips.

Memory IC Replacement Considerations

Direct replacements include other 23K640 variants with different packages such as PDIP or TSSOP. Check if the application requires the lower voltage 23A640 instead. Ensure any substitute maintains the same 8-pin SOIC footprint and SPI compatibility. Verify that the replacement meets the same AEC-Q100 automotive qualification if used in vehicle electronics.