Microchip Technology 24LCS52T-I/MNY

Overview

24LCS52T-I/MNY from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with hardware and software write protection, organized as 256 × 8-bit memory, operating from 2.2V to 5.5V, supporting up to 400 kHz clock frequency at V_CC ≥ 2.2V, and rated for industrial temperature range (–40°C to +85°C). It is used in embedded systems for nonvolatile storage of calibration data, configuration settings, and device identifiers.

For engineers reviewing the 24LCS52T-I/MNY datasheet, 24LCS52T-I/MNY pinout, 24LCS52T-I/MNY application, or 24LCS52T-I/MNY equivalent, key selection criteria include its dual write-protection scheme (WP pin + software fuse), 16-byte page write buffer, Schmitt-trigger I²C inputs for noise immunity, and 1 µA standby current enabling low-power battery-backed operation.

Technical Context

The 24LCS52T-I/MNY implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A2–A0), allowing up to eight devices on one bus. Its internal architecture includes an address pointer, page write buffer, HV generator for EEPROM programming, and independent write-protect logic that enforces hardware-level blocking when WP = V_CC, regardless of software fuse state.

It features built-in V_CC threshold detection disabling write operations below 1.5V, Schmitt-trigger inputs with 0.05×V_CC hysteresis, and slope-controlled outputs to suppress ground bounce. Write cycles are self-timed (max 5 ms), and acknowledge polling is supported to detect completion without fixed delays.

Key Specifications

Pinout & Package

24LCS52T-I/MNY is supplied in an 8-lead TDFN (2 mm × 3 mm) package with exposed pad, optimized for space-constrained PCB layouts in portable and industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA52T-I/MNY and AT24C02D-SSHM-T, the 24LCS52T-I/MNY uniquely combines guaranteed 400 kHz operation above 2.2V with irreversible software-based lower-half array protection-critical for applications where calibration data must survive both firmware errors and physical WP line faults.

Availability

24LCS52T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for 24LCS52T-I/MNY 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 design and manufacturing infrastructure.

The 24LCS52T-I/MNY belongs to Microchip's legacy 24XXX serial EEPROM family, designed specifically for reliable, low-power nonvolatile data storage in cost-sensitive industrial, automotive, and consumer applications where robustness and long-term data integrity are essential.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LCS52T-I/MNY?

The 24LCS52T-I/MNY requires a minimum V_CC of 2.2V for guaranteed operation, including full 400 kHz I²C communication and write functionality. Below 2.2V, the device may not respond correctly or complete writes; its internal V_CC detector disables erase/write logic below 1.5V to prevent corruption. This distinguishes it from the 24AA52T-I/MNY, which operates down to 1.8V.

How does the software write-protect feature work in the 24LCS52T-I/MNY?

The 24LCS52T-I/MNY software write-protect is a one-time-programmable fuse that permanently locks addresses 00h–7Fh (lower 128 bytes) by writing a '0110' control byte. Once set, the device no longer acknowledges this command, and those locations become read-only-even if the WP pin is later grounded. The 24LCS52T-I/MNY supports reset of this fuse using a special RWPF command with V_HH applied to WP.

Can the 24LCS52T-I/MNY be used interchangeably with the 24AA52T-I/MNY on the same PCB layout?

Yes-the 24LCS52T-I/MNY and 24AA52T-I/MNY share identical pinout, package dimensions, memory organization, and I²C protocol. However, they differ in minimum supply voltage (2.2V vs. 1.8V) and clock behavior below 2.2V (400 kHz vs. 100 kHz). Interchange is safe if the system operates ≥2.2V and does not rely on sub-2.2V functionality.

What is the maximum number of bytes that can be written in a single page write operation for the 24LCS52T-I/MNY?

The 24LCS52T-I/MNY supports up to 16 bytes per page write operation. The internal page buffer accepts these bytes sequentially after the initial word address, and the full 16-byte block is committed to memory upon receipt of the Stop condition. Crossing physical page boundaries (every 16 bytes) causes wraparound within the same page, so software must align writes to avoid unintended overwrites.

Does the 24LCS52T-I/MNY require external pull-up resistors on the SDA and SCL lines?

Yes-the 24LCS52T-I/MNY has open-drain SDA and SCL pins, mandating external pull-up resistors to V_CC. Recommended values are 2 kΩ for 400 kHz operation and 10 kΩ for 100 kHz. Proper pull-up strength ensures valid logic levels, meets rise-time specs (<1000 ns), and maintains noise margin on shared I²C buses with multiple devices.