23A1024T-E/ST

Memory IC Overview

The Microchip Technology 23A1024T-E/ST is a 1 Mbit 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 ranges or 16 MHz for automotive grades. The memory organization is 128K x 8 bits with a 32-byte page structure. It utilizes an 8-lead SOIC package (ST suffix) and functions across an ambient temperature range of -40°C to +125°C.

Memory IC Feature Summary

• Supports high-speed data transfer via Serial Quad Interface (SQI) mode allowing four bits per clock cycle.
• Provides unlimited read and write cycles with zero write time for immediate data availability.
• Includes a Hold function to suspend serial communication sequences without resetting the address pointer.
• Operates on low-power CMOS technology ensuring minimal standby current consumption.

Memory IC Applications

• Data logging systems requiring persistent temporary storage
• Embedded microcontroller applications needing fast non-volatile-like access
• Automotive electronic control units operating under extended temperature conditions

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range aligns with system power rails, as this variant is restricted to 1.7V–2.2V. Ensure compatibility with master devices supporting SDI/SQI protocols if higher throughput is intended. Check for RoHS compliance documentation during acquisition.

Memory IC Selection Notes

Select this component when an automotive-grade (-40°C to +125°C) Serial SRAM is required with a low-voltage supply constraint. It is suitable for designs prioritizing interface flexibility through SDI and SQI modes over standard SPI. Consider alternative packages like TSSOP or PDIP if board layout constraints differ from the SOIC form factor.

Memory IC Part Context

This part belongs to the 23A1024 series of 1 Mbit Serial SRAMs manufactured by Microchip Technology. It shares functional similarities with the 23LC1024 but differs primarily in its lower operating voltage range and specific temperature rating classifications defined by the manufacturer's product line segmentation.

Memory IC Replacement Considerations

Public confirmed substitute part numbers include 23A1024-I/SN and 23A1024-E/P. Verify pinout compatibility and voltage specifications before substitution.

Memory IC FAQ

How does the SQI mode improve performance compared to standard SPI?

In SQI mode, four bits of data are entered or exited per clock pulse using four bidirectional I/O pins, significantly increasing data throughput compared to the single-bit transfer of standard SPI mode.

What is the purpose of the HOLD pin in this device?

The HOLD pin allows the user to pause serial communication mid-sequence without losing the current address pointer or command state. It must be held high when not in use.