23A256-I/SN

Memory IC Overview

The Microchip Technology 23A256-I/SN is a 256 Kbit Serial SRAM device organized as 32,768 x 8 bits. 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 component utilizes a Serial Peripheral Interface (SPI) compatible bus for data access, featuring a maximum clock frequency of 20 MHz at 1.8 V. Key electrical characteristics include a read current of 3 mA at 1 MHz and a standby current of 4 µA maximum at +85°C. It is housed in an 8-lead SOIC package.

Memory IC Feature Summary

• Supports flexible operating modes including byte, page, and sequential operations via the STATUS register.
• Includes a HOLD pin that suspends serial communication without resetting the sequence, allowing host interruption handling.
• Utilizes low-power CMOS technology with high reliability and ESD protection on all pins.

Memory IC Applications

• Direct interface with microcontrollers lacking built-in SPI ports using discrete I/O lines.
• Data storage in systems requiring fast random access memory with non-volatile-like retention during power.
• Embedded applications utilizing Microchip PIC microcontroller families.

Memory IC Procurement Notes

Verify the specific ordering suffix matches the required voltage and temperature specifications. Confirm the package type corresponds to the design requirements. Ensure compliance with RoHS and lead-free standards if applicable. Check for automotive qualification if operating in extended temperature environments. Validate the manufacturer source against official Microchip documentation.

Memory IC Selection Notes

Select this component for applications requiring low-voltage operation between 1.5 V and 1.95 V. Choose the Industrial temperature grade for environments ranging from -40°C to +85°C. Consider the 23K256 variant if a higher supply voltage of 2.7 V to 3.6 V is necessary. Evaluate the need for the HOLD pin functionality for interrupt management. Assess the SPI bus compatibility with the host controller.

Memory IC Part Context

This part belongs to the 23X256 family of 256 Kbit Serial SRAM devices. It shares functional similarities with the 23K256 but differs in supply voltage requirements. The series is designed for simple serial bus access and is compatible with standard SPI protocols. It serves as a drop-in replacement for other 256 Kbit serial SRAMs with matching voltage and interface specifications.

Memory IC Replacement Considerations

The 23K256 is a related device within the same family but requires a different supply voltage range. Verify voltage compatibility before substitution. No other direct public substitute part numbers are confirmed in the provided documentation.

Memory IC FAQ

How does the HOLD pin function affect serial communication?

The HOLD pin allows the user to pause serial communication without resetting the sequence. Transitions on SI, SCK, and SO are ignored while held low, and communication resumes when the pin is brought high while SCK is low.

What are the available operating modes for the 23A256?

The device supports Byte mode, Page mode, and Sequential mode. These are selected by setting bits 7 and 6 in the STATUS register.