23K256-E/SN

Memory IC Overview

The Microchip Technology 23K256-E/SN is a 256 Kbit Serial SRAM device organized as 32,768 x 8 bits. It interfaces via an SPI-compatible serial bus with a maximum clock frequency of 20 MHz. The supply voltage range is 2.7 V to 3.6 V. Operating temperature spans from -40°C to +125°C. It utilizes low-power CMOS technology with standby current up to 10 µA at 125°C. The package is an 8-lead SOIC (3.90 mm width).

Memory IC Feature Summary

• Supports byte, page, and sequential read/write operations.
• Includes a HOLD pin to suspend communication without resetting the sequence.
• Compatible with standard SPI protocols for direct microcontroller interfacing.

Memory IC Applications

• Data logging in industrial environments
• Configuration storage for embedded systems
• Buffer memory for high-speed data acquisition

Memory IC Procurement Notes

Verify the specific suffix 'E' indicates extended temperature range (-40°C to +125°C) and 'SN' denotes the SOIC-8 package. Confirm RoHS compliance and lead-free status against the latest manufacturer documentation before finalizing procurement specifications.

Memory IC Selection Notes

Select this component when an SPI interface is required for non-volatile-like temporary storage in harsh thermal conditions. Ensure the system voltage remains within the 2.7 V to 3.6 V window. Consider the 32-byte page size for efficient bulk data transfers compared to byte-only access modes.

Memory IC Part Context

This part belongs to the 23X256 family of 256-Kbit Serial SRAMs. It shares functional similarities with the 23A256 but differs in operating voltage and temperature ratings. The family supports various packages including PDIP, SOIC, and TSSOP, providing flexibility for different PCB layout requirements.

Memory IC Replacement Considerations

Direct substitutes include other 23K256 variants with different packages (e.g., 23K256-I/ST) or temperatures (e.g., 23K256-I/SN). Verify voltage and temperature specs match application needs before substitution.

Memory IC FAQ

How does the HOLD pin function during operation?

The HOLD pin allows suspension of serial communication while maintaining the internal address pointer. Transitions on SI, SCK, and SO are ignored during hold, allowing the host to service higher priority interrupts.

What is the difference between Page mode and Sequential mode?

Page mode limits read/write operations within a single 32-byte page, wrapping the address counter at the page boundary. Sequential mode ignores page boundaries, automatically incrementing the address across the entire array until it rolls over to zero.