23A256-I/P

Memory IC Overview

The Microchip Technology 23A256-I/P is a 256 Kbit Serial SRAM device organized as 32,768 x 8 bits. It interfaces via a standard SPI-compatible serial bus requiring SCK, SI, SO, and CS signals. The component 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. It utilizes low-power CMOS technology with a maximum clock frequency of 20 MHz. The device is housed in an 8-lead PDIP package.

Memory IC Feature Summary

• Supports flexible operating modes including byte read/write, page mode for 32-byte pages, and sequential mode for continuous array access.
• Includes a HOLD pin that suspends communication during active sequences without resetting the internal address pointer, allowing host interruption handling.
• Features high reliability with ESD protection on all pins and compliance with Pb-Free and RoHS standards.

Memory IC Applications

• Direct interface with microcontrollers possessing built-in SPI ports, such as PIC families.
• Systems requiring discrete I/O line programming to emulate SPI protocol for memory expansion.
• Embedded designs needing volatile data storage with low power consumption profiles.

Memory IC Procurement Notes

Verify the specific ordering suffix 'I' confirms the industrial temperature grade (-40°C to +85°C) and 'P' denotes the PDIP package style. Confirm the voltage range matches the 1.5V to 1.95V specification required for the 23A256 variant, distinct from the 23K256 series. Ensure compatibility with the target system's SPI clock polarity and phase settings before finalizing procurement.

Memory IC Selection Notes

Select this component when a low-voltage (1.5V–1.95V) serial SRAM solution is required for industrial environments. The PDIP package is suitable for through-hole prototyping or applications where surface-mount options are not feasible. Consider the 23K256 variant if the system operates at higher voltages (2.7V–3.6V), while retaining the same functional interface and memory organization.

Memory IC Part Context

This part belongs to the 23X256 family of 256-Kbit Serial SRAM devices manufactured by Microchip Technology. The family shares identical functional architectures and instruction sets, differing primarily in supply voltage requirements and temperature ratings. The 23A256 specifically targets ultra-low voltage applications compared to the broader 23K256 series.

Memory IC Replacement Considerations

The 23K256-I/P serves as a functional substitute within the same family, provided the application voltage supports the 2.7V–3.6V range. Verify that the replacement part's voltage tolerance aligns with the system design, as the 23A256 is restricted to 1.5V–1.95V.

Memory IC FAQ

How does the HOLD pin function during a serial sequence?

The HOLD pin allows the host to pause communication without resetting the internal address counter. When pulled low while SCK is low, it places inputs/outputs in a high-impedance state. Communication resumes when held high again while SCK is low.

What are the available operating modes for data transfer?

The device supports Byte mode (single byte access), Page mode (access limited to a 32-byte page with automatic wrapping), and Sequential mode (continuous access across page boundaries with address rollover).