23A640T-I/SN

Memory IC Overview

The Microchip Technology 23A640T-I/SN is a 64-Kbit (8192 x 8-bit) low-power CMOS Serial SRAM device. It interfaces via a standard SPI-compatible serial bus requiring SCK, SI, SO, and CS lines. The device supports a maximum clock frequency of 20 MHz depending on supply voltage conditions. It operates within a supply voltage range of 1.5 V to 1.95 V. The component features a 32-byte page size and includes a HOLD pin for pausing transmission. It is packaged in an 8-lead SOIC format and is rated for industrial temperature operation from -40°C to +85°C.

Memory IC Feature Summary

• Supports flexible operating modes including byte read/write, 32-byte page mode, and sequential mode.
• Includes a dedicated HOLD input pin that suspends serial communication without resetting the sequence.
• Features low-power CMOS technology with defined standby current limits at elevated temperatures.
• Provides access to a STATUS register for configuring device operating modes.

Memory IC Applications

• Interfacing directly with microcontroller families possessing built-in SPI ports.
• Data storage applications requiring non-volatile-like retention during power-down states.
• Systems utilizing discrete I/O lines programmed in firmware to emulate SPI protocols.
• Industrial control environments requiring operation across extended temperature ranges.

Memory IC Procurement Notes

Verify the specific ordering suffix 'T' corresponds to reel packaging requirements for your assembly line. Confirm the 'I' designation matches the required industrial temperature range specifications. Ensure the SN package variant aligns with your PCB footprint design. Cross-reference the voltage supply constraints with your system's power rails to ensure compatibility with the 1.5V to 1.95V operational window.

Memory IC Selection Notes

Select this component when a low-pin-count serial memory solution is required for small data buffers. Consider the 23K640 if a higher supply voltage range is necessary for your system architecture. Evaluate the HOLD pin functionality if bus arbitration with other SPI peripherals is critical. Verify that the 64-Kbit capacity meets your specific data storage needs without excessive overhead.

Memory IC Part Context

This part belongs to the 23X640 family of 64-Kbit Serial SRAM devices manufactured by Microchip Technology. The family shares identical functional architectures and pinouts but differs primarily in supply voltage specifications and temperature ratings. The 23A640 variant specifically targets low-voltage applications compared to the 23K640 counterpart.

Memory IC Replacement Considerations

The 23K640 series serves as a functional alternative if the system supports a 2.7V to 3.6V supply range. Other members of the 23X640 family may be considered provided they match the required voltage and temperature specifications.