23K640-E/P

Memory IC Overview

The Microchip Technology 23K640-E/P is a 64 Kbit Serial SRAM device organized as 8192 x 8 bits. It operates within a supply voltage range of 2.7 V to 3.6 V and supports a maximum clock frequency of 20 MHz via a SPI-compatible serial bus. The component utilizes an 8-lead PDIP package for through-hole mounting. It functions across an extended temperature range from -40°C to +125°C, featuring low-power CMOS technology with standby current maximized at 4 µA at +85°C.

Memory IC Feature Summary

• Supports flexible operating modes including byte read/write, 32-byte page mode, and sequential access.
• Includes a HOLD pin to suspend transmission during serial sequences without resetting the sequence.
• Features high reliability with ESD protection on all pins.

Memory IC Applications

• Data logging in embedded systems
• Configuration storage for microcontrollers
• Non-volatile data backup applications

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature rating (-40°C to +125°C) and the 'P' indicates the PDIP package type. Ensure the design requires the 2.7V to 3.6V supply range rather than the lower voltage options available in the 23A640 variant. Confirm that the 8-lead through-hole form factor aligns with the target PCB layout requirements.

Memory IC Selection Notes

Select this component when an SPI interface is required for fast random access memory operations in environments requiring extended temperature stability. The 23K640-E/P is suitable for designs needing 64 Kbit of volatile storage with low standby power consumption. Consider the PDIP package constraints if surface mount alternatives like SOIC or TSSOP are not feasible for the assembly process.

Memory IC Part Context

The 23K640 belongs to the 23X640 family of low-power Serial SRAM devices manufactured by Microchip Technology. This series provides a simple interface to popular microcontroller families, including PIC® microcontrollers, allowing direct connection via standard SPI ports. The device serves as a versatile memory solution for applications requiring rapid data access and flexible configuration storage capabilities.

Memory IC Replacement Considerations

The 23K640-I/P is available as an industrial temperature variant (-40°C to +85°C). Other packages such as SOIC (SN) and TSSOP (ST) exist within the same electrical specification.

Memory IC FAQ

How does the HOLD pin function affect serial communication?

The HOLD pin allows the host to pause serial communication without resetting the sequence. Transitions on SI, SCK, and SO are ignored while held low, and operation resumes when the pin is brought high while SCK is low.

What is the default operating mode upon power-up?

The device powers on in low-power Standby mode with CS high. A high-to-low transition on CS is required to enter the active state, and the default mode bits in the STATUS register are set to Byte mode.