Microchip Technology 23LCV1024T-I/SN

Overview

23LCV1024T-I/SN from Microchip Technology is a 1 Mbit (128K × 8) industrial-grade SPI Serial SRAM with battery backup support, SDI dual-interface capability, 20 MHz clock rate, and zero write time. It operates across 2.5–5.5 V, draws only 3 mA during active read at 5.5 V/20 MHz, and maintains data via external VBAT supply down to 1.0 V. It serves as nonvolatile buffer memory in power-fail-safe embedded controllers and real-time data loggers.

For engineers reviewing the 23LCV1024T-I/SN datasheet, 23LCV1024T-I/SN pinout, 23LCV1024T-I/SN application, or 23LCV1024T-I/SN equivalent, this page delivers verified package mapping (8-lead SOIC), validated SPI/SDI timing parameters, confirmed VBAT retention behavior (1.0 V min), exact mode register configuration (Byte/Page/Sequential), and real-world use cases requiring unlimited write endurance and fast serial access without refresh overhead.

Technical Context

The 23LCV1024T-I/SN implements a true asynchronous SRAM core accessed via a hardware-managed SPI interface with dedicated CS, SCK, SI, and SO pins - plus shared SIO0/SIO1 for SDI mode. Its internal 24-bit address counter supports automatic rollover and page boundary handling in Page (32-byte) and Sequential modes.

It features an integrated VBAT switchover circuit with 1.6–2.0 V trip point (typ. 1.8 V), enabling seamless transition to external coin-cell backup when VCC drops below VTRIP. The MODE register (bits 7–6) selects operation mode, and instruction decoding (e.g., 0x02 WRITE, 0x03 READ, 0x3B EDIO) is fully synchronous to SCK rising edges.

Key Specifications

Pinout & Package

23LCV1024T-I/SN is housed in an 8-lead SOIC (3.90 mm body, SN suffix) with standard JEDEC MS-012AC footprint. Pin 3 is NC; all other pins are functionally assigned per Microchip DS25156A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LC1024-I/SN, the 23LCV1024T-I/SN adds guaranteed data retention via VBAT and SDI mode for higher throughput; compared with FM25V10-G, it offers wider VCC range, integrated backup switchover, and dual-I/O capability at the cost of higher active current.

Availability

23LCV1024T-I/SN is available at Aetrix Electronics and suitable for industrial data loggers, PLC I/O modules, medical event recorders, and smart meter firmware state backup requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 23LCV1024T-I/SN 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 for embedded control applications.

The 23LCV1024T-I/SN belongs to Microchip's serial SRAM product line, designed specifically for systems needing fast, reliable, battery-backed memory with SPI simplicity and zero write latency.

FAQ

What is the VBAT switchover threshold for the 23LCV1024T-I/SN?

The 23LCV1024T-I/SN switches from VCC to VBAT when VCC falls below the VTRIP voltage, specified as 1.6–2.0 V (typ. 1.8 V) at 25°C. This ensures continuous data retention during brownouts. The device maintains RAM contents down to 1.0 V on VBAT, supporting long-term backup from standard coin cells. This behavior is fully characterized in DS25156A Table 1-1 (D012).

Does the 23LCV1024T-I/SN support true dual-I/O (SDI) mode, and how is it enabled?

Yes, the 23LCV1024T-I/SN supports Serial Dual Interface (SDI) mode using pins SIO0 (Pin 5) and SIO1 (Pin 2). SDI mode is entered by issuing the EDIO command (0x3B) via SPI; it is exited using RSTIO (0xFF). In SDI mode, two bits are transferred per clock cycle, doubling effective throughput. Pin functions are shared between SPI and SDI modes as documented in DS25156A Section 3.7.

What are the valid operating modes of the 23LCV1024T-I/SN, and how are they selected?

The 23LCV1024T-I/SN supports Byte, Page, and Sequential modes, controlled by bits 7 and 6 of the MODE register. Byte mode (00) accesses one byte per transaction; Page mode (10) allows up to 32-byte bursts within a page; Sequential mode (01, default) enables wraparound reads/writes across the full 128K address space. Mode is set via WRMR (0x01) instruction.

Is the 23LCV1024T-I/SN pin-compatible with the standard 23LC1024 series?

Yes, the 23LCV1024T-I/SN shares identical 8-lead SOIC (SN) pinout and electrical signaling with the 23LC1024 series. Pin assignments (CS, SO/SIO1, NC, VSS, SI/SIO0, SCK, VBAT, VCC) match exactly. However, the 23LCV1024T-I/SN adds VBAT functionality and SDI support - unused pins (e.g., VBAT) must be properly terminated in legacy designs.

What is the maximum clock frequency and corresponding timing constraint for the 23LCV1024T-I/SN?

The 23LCV1024T-I/SN supports up to 20 MHz SCK frequency. Key AC constraints include: CS setup time (25 ns), data setup/hold (10 ns each), CLK rise/fall time (≤20 ns), and output valid delay (≤25 ns from clock low). These values are guaranteed across –40°C to +85°C and define the minimum timing margins for reliable SPI master design.