23LCV04M-I/ST

Memory IC Overview

The Microchip Technology 23LCV04M-I/ST is a 4-Mbit (512-Kbyte) low-power serial SRAM device housed in a 14-lead TSSOP package. It operates within a voltage range of 2.2V to 3.6V and supports an industrial temperature range from -40°C to +85°C. The memory array is organized as 256K x 8 bits and accessed via a Serial Peripheral Interface (SPI) compatible bus, with support for Serial Dual Interface (SDI) and Serial Quad Interface (SQI) modes to achieve clock frequencies up to 143 MHz. Key electrical characteristics include a maximum active read current of 6 mA at 40 MHz and a typical standby current of 140 µA.

Memory IC Feature Summary

• Supports external battery backup via the VBAT pin to maintain data retention when VCC drops below the trip point.
• Includes built-in Error Correction Code (ECC) logic to ensure superior data reliability during read operations.
• Offers flexible page size configuration allowing selection between 32-byte or 256-byte pages for write operations.
• Provides unlimited read and write cycles with zero write time, eliminating the need for erase cycles.

Memory IC Applications

• Data logging systems requiring non-volatile storage capabilities through external battery integration.
• Embedded control applications needing high-speed data buffering with SPI, SDI, or SQI interfaces.
• Industrial monitoring devices operating within strict industrial temperature ranges (-40°C to +85°C).

Memory IC Procurement Notes

Verify that the specific part number suffix corresponds to the 14-lead TSSOP package, as the 23LCV04M family is exclusively available in 14-lead configurations unlike the 8-lead 23AA04M. Confirm the 'I' suffix indicates the industrial temperature grade suitable for environments ranging from -40°C to +85°C. Ensure the design accounts for the VBAT pin requirements if battery backup functionality is intended for the application.

Memory IC Selection Notes

Select this component over the 23AA04M variant specifically when external battery backup support is required, as the AA series lacks the VBAT pin. Consider the 14-lead package constraint compared to smaller 8-lead options available in other density levels. Evaluate the need for SQI or SDI modes if higher throughput than standard SPI is necessary, keeping in mind the increased pin count usage for multiplexed I/O lines.

Memory IC Part Context

This device belongs to the 23XX04M family of 4-Mbit serial SRAMs manufactured by Microchip Technology. It shares architectural similarities with the 23AA04M but differs in power supply specifications and the inclusion of battery backup features. The family supports multiple interface protocols including SPI, SDI, and SQI, providing versatility for various host controller requirements while maintaining low power consumption profiles.

Memory IC Replacement Considerations

• 23AA04M-I/ST

Memory IC FAQ

How does the device handle data retention when the main power supply fails?

The 23LCV04M automatically switches to an external backup supply connected to the VBAT pin when VCC falls below the VTRIP level, ensuring no data loss. Upon restoration of VCC, normal operation resumes automatically.

What is the function of the HOLD/SIO3 pin?

In SPI and SDI modes, the HOLD/SIO3 pin pauses serial communication sequences without resetting the clocking sequence, allowing the host to service higher priority interrupts. In SQI mode, it functions as a fourth bidirectional I/O pin.