23K640T-I/ST

Memory IC Overview

The Microchip Technology 23K640T-I/ST 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 component supports a maximum clock frequency of 20 MHz at VCC = 3.0V. Operating voltage ranges from 2.7V to 3.6V. It features a 32-byte page size and includes a HOLD pin for pausing communication. The Industrial temperature grade (-I) covers -40°C to +85°C. The device is housed in an 8-lead TSSOP package.

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 to suspend serial transmission without resetting the sequence.
• Provides high reliability with data retention down to 1.2V.
• Compatible with standard SPI protocols for direct interfacing with microcontrollers.

Memory IC Applications

• Data logging systems requiring non-volatile-like temporary storage
• Embedded sensor data buffering
• Microcontroller peripheral memory expansion

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C). Confirm 'ST' indicates the 8-lead TSSOP package type. Ensure the part number matches the 23K640 series for the 2.7V-3.6V supply voltage range, distinct from the 23A640 series which operates at lower voltages.

Memory IC Selection Notes

Select this component when an SPI interface is required for small-scale volatile memory. It is suitable for applications needing fast random access with low power consumption. Consider the 32-byte page boundary limitations if large contiguous writes are frequent. Verify system voltage compatibility within the 2.7V to 3.6V range before integration.

Memory IC Part Context

This device belongs to the 23X640 family of 64-Kbit Serial SRAMs from Microchip Technology. It shares functional similarities with the 23A640 but differs in supply voltage requirements and automotive qualification options. The family is designed for low-pin-count memory solutions in space-constrained embedded designs.

Memory IC Replacement Considerations

Direct substitutes include other 64-Kbit SPI SRAMs from Microchip such as the 23K640-E/SN for automotive grades or different packages. Cross-brand replacements require verification of SPI timing parameters and voltage levels.