Microchip Technology 23LCV512-I/P

Overview

23LCV512-I/P from Microchip Technology is an industrial-grade 512 Kbit (64K × 8) SPI Serial SRAM with external battery backup support via VBAT pin, 20 MHz max clock rate, 2.5–5.5 V supply range, and SDI dual-interface capability. It delivers zero write time, unlimited read/write cycles, and operates across –40°C to +85°C in 8-lead PDIP packaging - ideal for embedded data logging and power-fail-safe memory buffering.

For engineers reviewing the 23LCV512-I/P datasheet, 23LCV512-I/P pinout, 23LCV512-I/P application, or 23LCV512-I/P equivalent, key selection criteria include VBAT retention voltage (1.0 V), standby current (4 µA at +85°C), SPI/SDI mode flexibility, page/sequential access modes, and PDIP package compatibility with legacy through-hole designs.

Technical Context

The 23LCV512-I/P implements a true serial SRAM architecture with an 8-bit instruction register and MSb-first SPI protocol compliance. It supports three configurable access modes - Byte (single-byte), Page (32-byte auto-increment within page), and Sequential (full-array wraparound) - all selectable via the MODE register (default: Sequential).

Its dual-interface capability enables SDI mode using SIO0/SIO1 pins after issuing the EDIO command, doubling effective throughput versus standard SPI. Internal VBAT switchover occurs at 1.6–2.0 V (typ. 1.8 V), maintaining data integrity when VCC drops below VTRIP while disabling read/write access until VCC recovers above threshold.

Key Specifications

Pinout & Package

23LCV512-I/P is packaged in an 8-lead Plastic Dual In-Line Package (PDIP), 300 mil body width, with through-hole mounting and industry-standard pin spacing (0.100" pitch). Pin 1 is marked by notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LC1024-I/P, the 23LCV512-I/P provides optimal cost-per-bit for mid-size buffers; versus FM25V05-G, it trades F-RAM's intrinsic nonvolatility for broader voltage operation and explicit battery-backed retention - critical for brown-out resilience in mixed-voltage industrial systems.

Availability

23LCV512-I/P is available at Aetrix Electronics and suitable for industrial data loggers, medical device memory buffers, automotive body control modules, and POS terminal transaction caches requiring stable component supply across extended production lifecycles.

Supply support for 23LCV512-I/P 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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 23LCV512-I/P belongs to Microchip's serial SRAM product line, engineered specifically for robust, low-power, battery-backed data buffering in resource-constrained embedded systems operating across harsh industrial and automotive environments.

FAQ

What is the maximum clock frequency supported by the 23LCV512-I/P?

The 23LCV512-I/P supports a maximum clock frequency of 20 MHz in both SPI and SDI modes. This specification is guaranteed across the full industrial temperature range (–40°C to +85°C) and 2.5–5.5 V supply range. Timing parameters including setup/hold times and output valid delays are defined in the AC Characteristics table (DS20005157B-page 3) and validated under CL = 30 pF loading conditions.

Does the 23LCV512-I/P require external pull-up resistors on its SPI lines?

The 23LCV512-I/P does not require external pull-up resistors on SI, SO, or SCK for basic SPI operation, as these pins are CMOS-compatible with standard microcontroller GPIOs. However, CS must be actively driven low during transactions; if shared among multiple devices, a pull-up resistor (typically 4.7 kΩ to VCC) is recommended to ensure reliable deselection. VBAT should be pulled to VSS if unused.

How does the VBAT function work on the 23LCV512-I/P?

The 23LCV512-I/P uses an internal analog switch to automatically transition from VCC to VBAT when the main supply falls below the VTRIP threshold (1.6–2.0 V, typ. 1.8 V). During VBAT operation, read/write access is disabled - only data retention is maintained at ≤1.0 V. The device resumes full functionality once VCC rises above VTRIP, with no initialization sequence required.

Can the 23LCV512-I/P be used in SDI (dual I/O) mode with any microcontroller?

The 23LCV512-I/P supports SDI mode only when paired with a host capable of generating dual-bit clocked waveforms on SIO0/SIO1 and interpreting the EDIO/RSTIO commands. Standard SPI peripherals cannot natively drive SDI; dedicated hardware support or firmware bit-banging with precise timing control is required. Refer to Figures 4-1 through 4-4 in DS20005157B for SDI timing constraints.

What package type does the 23LCV512-I/P use, and is it RoHS compliant?

The 23LCV512-I/P uses an 8-lead Plastic Dual In-Line Package (PDIP) with 300 mil body width and 0.100" lead pitch. It is Pb-free and RoHS compliant, halogen free, and marked "I/P" per Microchip's product identification system (DS20005157B-page 27). The package meets JEDEC MS-001 standards and supports through-hole reflow or wave soldering.