Microchip Technology 23LCV1024-E/ST

Overview

23LCV1024-E/ST from Microchip Technology Inc. is a 1 Mbit (128K × 8) SPI-compatible serial SRAM with battery backup support, SDI dual-I/O interface, and industrial temperature range (−40°C to +85°C). It operates from 2.5–5.5 V, supports 20 MHz clock rate, delivers 3 mA read current at 5.5 V/20 MHz, and features zero write time with unlimited read/write cycles. It is used in embedded systems requiring nonvolatile data retention during main power loss, such as industrial controllers and metering devices.

For engineers reviewing the 23LCV1024-E/ST datasheet, 23LCV1024-E/ST pinout, 23LCV1024-E/ST application, or 23LCV1024-E/ST equivalent, this page provides verified technical context, real-world timing and power parameters, validated pin functions for SOIC/TSSOP/PDIP packages, and confirmed alternative parts for memory expansion or backup-critical designs.

Technical Context

The 23LCV1024-E/ST implements a true serial SRAM architecture with SPI- and SDI-mode operation, using separate SI/SO pins in SPI mode and shared SIO0/SIO1 pins in SDI mode. Its internal 24-bit address counter supports byte, page (32-byte), and sequential access modes, with automatic rollover at 0x1FFFF.

It integrates an internal voltage-switching circuit that transitions between VCC and VBAT (pin 7) when VCC drops below the 1.6–2.0 V trip point (typ. 1.8 V), preserving RAM data without external supervision. The device powers up in standby mode and requires CS low to initiate any operation.

Key Specifications

Pinout & Package

23LCV1024-E/ST is supplied in an 8-lead TSSOP package (4.4 mm body width), RoHS-compliant and halogen-free. Pin numbering follows standard JEDEC outline MS-012, with pin 1 marked by a dot or bevelled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial SRAM applications.

Compared with 23LCV1024-E/ST, 23LC1024-I/ST removes backup capability while retaining full SPI compatibility, whereas FM25V10-G replaces volatile SRAM with nonvolatile F-RAM-offering inherent data retention but sacrificing SDI mode and peak speed.

Availability

23LCV1024-E/ST is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, PLC I/O modules, and medical diagnostic buffers requiring stable component supply, guaranteed long-term availability, and traceable sourcing.

Supply support for 23LCV1024-E/ST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with global manufacturing and quality certifications including ISO/TS-16949.

The 23LCV1024-E/ST belongs to Microchip's serial SRAM product line, designed specifically for embedded systems needing fast, reliable, battery-backed memory with minimal footprint and SPI-native integration.

FAQ

What is the primary function of the VBAT pin on the 23LCV1024-E/ST?

The VBAT pin on the 23LCV1024-E/ST serves as the external backup supply input, enabling data retention when main VCC drops below the 1.6–2.0 V trip threshold. An internal analog switch automatically transfers power source from VCC to VBAT, preserving SRAM contents without software or external circuitry. This makes the 23LCV1024-E/ST uniquely suited for applications where uninterrupted memory operation is essential during power failures.

Does the 23LCV1024-E/ST support both SPI and SDI communication modes?

Yes, the 23LCV1024-E/ST supports both standard SPI (using SI, SO, SCK, and CS) and Serial Dual Interface (SDI) mode using SIO0 and SIO1 pins. SDI mode is entered via the EDIO command (0x3B) and exited with RSTIO (0xFF). In SDI mode, two bits are transferred per clock cycle, effectively doubling throughput compared to standard SPI at the same clock frequency - a key advantage of the 23LCV1024-E/ST in bandwidth-constrained designs.

What are the valid operating voltage ranges for VCC and VBAT on the 23LCV1024-E/ST?

The 23LCV1024-E/ST accepts VCC from 2.5 V to 5.5 V and VBAT from 1.4 V to 3.6 V. The internal switchover occurs when VCC falls within the 1.6–2.0 V range (typ. 1.8 V), ensuring seamless transition to backup power. Both supplies must be independently decoupled, and VBAT should be connected to a stable coin cell or supercapacitor - critical for reliable operation of the 23LCV1024-E/ST in mission-critical backup scenarios.

How does the 23LCV1024-E/ST handle memory addressing in sequential mode?

In sequential mode (MODE register bits 7:6 = 01), the 23LCV1024-E/ST automatically increments its internal 24-bit address counter after each byte transfer, wrapping from 0x1FFFF back to 0x00000. This allows continuous read/write across the entire 128K × 8 array without reissuing addresses - ideal for streaming applications like waveform capture or firmware patching. The 23LCV1024-E/ST maintains this behavior regardless of page boundaries, unlike page mode which resets at 32-byte intervals.

Is the 23LCV1024-E/ST pin-compatible with other members of the 23LCx024 family?

Yes, the 23LCV1024-E/ST shares identical pinout, package dimensions, and electrical interface with other 8-pin variants in the 23LCx024 family, including 23LC1024-I/ST and 23LCV512-E/ST. All use the same SOIC/TSSOP/PDIP footprints and support identical SPI command sets. However, VBAT functionality and SDI support are exclusive to the "V"-suffix parts - so while physical replacement is possible, functional equivalence requires verifying backup and dual-I/O requirements for the specific 23LCV1024-E/ST implementation.