23A512-I/ST

Memory IC Overview

The Microchip Technology 23A512-I/ST is a 512-Kbit Serial SRAM device featuring SPI, SDI, and SQI interfaces. It operates within a supply voltage range of 1.7V to 2.2V and supports clock frequencies up to 20 MHz in Industrial temperature conditions (-40°C to +85°C). The memory is organized as 64K x 8 bits with 32-byte pages. Key electrical characteristics include a read current of 3 mA at 5.5V (typical for the family) and standby current of 4 µA at +85°C.

Memory IC Feature Summary

• Supports SPI, Serial Dual Interface (SDI), and Serial Quad Interface (SQI) modes for flexible data transfer rates.
• Provides unlimited read and write cycles with zero write time, eliminating wear-out limitations associated with non-volatile memory.
• Includes a Hold function to suspend serial communication sequences without resetting the internal address pointer.
• Operates across Industrial and Extended temperature ranges with high reliability standards.

Memory IC Applications

• Data logging applications requiring frequent updates without endurance limits.
• Configuration storage in microcontroller systems needing fast access times.
• Buffering operations in embedded systems utilizing SPI-compatible buses.
• Industrial control systems operating within specified temperature ranges.

Memory IC Procurement Notes

Verify that the application voltage does not exceed the 2.2V maximum limit for the 23A512 variant, as it differs from the 23LC512. Confirm the -I suffix corresponds to the Industrial temperature range (-40°C to +85°C). Ensure the ST package designation matches the required TSSOP-8 footprint for PCB layout compatibility.

Memory IC Selection Notes

Select this component when low-voltage operation (1.7V-2.2V) is required, distinguishing it from the 2.5V-5.5V 23LC512. Choose based on the need for high-speed sequential or page-based access via SDI/SQI modes. Consider the TSSOP-8 package for surface-mount assembly constraints.

Memory IC Part Context

The 23A512 belongs to the 23A512/23LC512 family of 512-Kbit Serial SRAMs. It shares functional similarities with the 23LC512 but is optimized for lower voltage applications. Both variants support identical interface protocols and pinouts, differing primarily in supply voltage specifications and temperature grade availability.

Memory IC Replacement Considerations

The 23LC512-I/ST is a functional substitute if the system voltage supports 2.5V-5.5V operation. Verify voltage tolerance before substitution. Other 512-Kbit SPI SRAMs may require firmware changes due to different command sets or timing parameters.

Memory IC FAQ

Does the HOLD function work in SQI mode?

No, the HOLD functionality is not available when operating in Serial Quad Interface (SQI) mode because the SIO3 pin is repurposed for data transmission.

What is the default mode of operation upon power-up?

The device powers on in Standby mode. After selection, the default operational mode is Sequential mode unless the Mode Register is explicitly configured otherwise.