Microchip Technology 23LCV1024-I/P

Overview

23LCV1024-I/P from Microchip Technology is a 1 Mbit (128K × 8) industrial-grade SPI Serial SRAM with battery backup support, SDI dual-interface capability, and 2.5–5.5 V operation. It delivers 20 MHz clock rate, 3 mA read current at 5.5 V/20 MHz, and 4 µA standby current at +85°C, enabling nonvolatile data retention in power-loss scenarios for embedded control logging and configuration storage.

For engineers reviewing the 23LCV1024-I/P datasheet, 23LCV1024-I/P pinout, 23LCV1024-I/P application, or 23LCV1024-I/P equivalent, this page provides verified electrical specs, package mapping to 8-lead PDIP, confirmed SDI/SPI mode behavior, VBAT switchover threshold (1.6–2.0 V), and real-world timing parameters including 25 ns CS setup and 25 ns output valid delay.

Technical Context

The 23LCV1024-I/P implements a true serial SRAM architecture with dedicated SI/SO pins for standard SPI mode and shared SIO0/SIO1 pins for SDI mode-enabling 2-bit-per-clock transfers when configured via EDIO/RSTIO commands. Its internal 24-bit address counter supports byte, page (32-byte), and sequential access modes, with automatic rollover at 1FFFFh.

It integrates an internal voltage-switching circuit that transitions from VCC to VBAT (pin 7) when supply drops below VTRIP (1.6–2.0 V), preserving RAM contents down to 1.0 V VDR. The device powers on in standby mode and requires CS low-to-high transition to initiate active operation.

Key Specifications

Pinout & Package

23LCV1024-I/P is packaged in an 8-lead PDIP (Plastic Dual In-line Package) with 300 mil body width, lead pitch of 0.100", and RoHS-compliant matte tin plating. Pin 3 is NC (No Connect); all other pins match SOIC/TSSOP functional assignments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 23LCV1024-I/P, the 23LC1024-I/P saves cost but forfeits autonomous VBAT retention, while the FM24CL16B-G offers infinite endurance at lower density and without SDI acceleration - making 23LCV1024-I/P the sole choice for high-speed, high-capacity, self-contained battery-backed serial SRAM.

Availability

23LCV1024-I/P is available at Aetrix Electronics and suitable for industrial data loggers, medical device configuration stores, and smart energy meter firmware caches requiring stable component supply across extended production lifecycles.

Supply support for 23LCV1024-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 components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The 23LCV1024 belongs to Microchip's serial SRAM product line, designed specifically for applications demanding fast, reliable, battery-backed volatile memory with SPI compatibility and industrial temperature resilience.

FAQ

What is the VTRIP voltage range for 23LCV1024-I/P, and how does it affect backup switching?

The VTRIP specification for 23LCV1024-I/P is 1.6 V (min) to 2.0 V (max) at 25°C. When VCC falls below this threshold, the internal switch automatically transfers power sourcing from VCC to VBAT (pin 7), preserving SRAM contents without software intervention. This hysteresis prevents oscillation near the trip point and ensures clean, glitch-free retention activation - a key differentiator from discrete supervisor-based solutions.

Does 23LCV1024-I/P support true dual-I/O (SDI) mode, and how is it enabled?

Yes, 23LCV1024-I/P supports SDI mode using pins SIO0 (SI) and SIO1 (SO) to transfer two bits per clock cycle. It is enabled by issuing the EDIO instruction (0x3B) after CS assertion. Once entered, all subsequent operations use dual-I/O until RSTIO (0xFF) resets the interface. SDI mode doubles effective throughput versus standard SPI but requires master-side protocol alignment - confirmed in DS25156A Figures 4-1 through 4-4.

What is the maximum clock frequency supported by 23LCV1024-I/P, and under what conditions is it guaranteed?

The 23LCV1024-I/P guarantees 20 MHz maximum clock frequency across the full industrial temperature range (-40°C to +85°C) and VCC range (2.5 V to 5.5 V). This is validated per AC Characteristic Table 1-2 (Param No. 1, FCLK), with timing margins maintained for all setup/hold requirements including TCSS (25 ns CS setup) and TV (25 ns output valid).

How does the 23LCV1024-I/P handle page boundaries during Page Write mode?

In Page Write mode (MODE[7:6] = 10), the 23LCV1024-I/P auto-increments its internal address pointer for each byte written, but wraps to the start of the same 32-byte page upon reaching the page boundary - not to the next page. This prevents unintended cross-page overwrites and enforces strict 32-byte alignment, simplifying firmware buffer management for fixed-size logging buffers.

Is pin 3 (NC) on the 23LCV1024-I/P PDIP package required to be left floating, or can it be grounded?

Pin 3 on the 23LCV1024-I/P PDIP package is designated NC (No Connect) and must remain unconnected - neither tied to VSS nor pulled high. Microchip's DS25156A-page 12 explicitly states "NC" in the Pin Function Table and cautions against routing or biasing this pin, as it is internally unconnected and grounding it may introduce parasitic coupling or violate package test protocols.