Microchip Technology 24LCS52T-I/SN

Overview

24LCS52T-I/SN 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 delivers 1 mA typical active current and 1 µA typical standby current, enabling low-power embedded data logging in space-constrained systems.

For engineers reviewing the 24LCS52T-I/SN datasheet, 24LCS52T-I/SN pinout, 24LCS52T-I/SN application, or 24LCS52T-I/SN equivalent, key selection criteria include its dual write-protection scheme (WP pin + software fuse), page-write buffer (16-byte), Schmitt-trigger inputs for noise immunity, and compatibility with standard I²C bus timing across 2.2–5.5V supply.

Technical Context

The 24LCS52T-I/SN implements a true 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 buffer, HV generator for EEPROM programming, and separate write-protect logic that enforces hardware-level blocking when WP = V_CC, independent of software state.

It supports byte and page write operations with self-timed internal erase/write cycles (max 5 ms), acknowledge polling for bus efficiency, and robust noise suppression via Schmitt-trigger inputs and input filter spike suppression (50 ns). The device incorporates V_CC threshold detection to disable writes below 1.5V, preventing corruption during brown-out conditions.

Key Specifications

Pinout & Package

24LCS52T-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil body width, RoHS-compliant matte tin (Sn) finish, and JEDEC-standard footprint compatible with automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA52-I/SN and AT24C02C-SSHM-T, the 24LCS52T-I/SN provides the best balance of industrial temperature assurance, dual write-protection granularity, and 400 kHz performance within its 2.2–5.5V window - making it ideal for fixed-supply embedded systems where robustness outweighs ultra-low-voltage or ultra-high-speed needs.

Availability

24LCS52T-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration memory, and smart meter firmware parameter tables requiring stable component supply across extended lifecycle commitments.

Supply support for 24LCS52T-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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24LCS52T-I/SN belongs to Microchip's 24XXX52 family of I²C EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in industrial, automotive, and medical applications demanding extended temperature operation and robust write protection.

FAQ

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

The 24LCS52T-I/SN requires a minimum supply voltage of 2.2V for full specification compliance, including 400 kHz I²C operation and guaranteed write functionality. Operation below 2.2V is not supported - unlike the 24AA52 variant, which specifies 1.8V minimum. Attempting to power the 24LCS52T-I/SN below 2.2V may result in unpredictable behavior or failure to acknowledge I²C commands.

How does the hardware write-protect (WP) pin interact with the software write-protect feature in the 24LCS52T-I/SN?

When the WP pin of the 24LCS52T-I/SN is tied to VCC, hardware write protection is enabled and overrides all software settings - locking the entire 256-byte array regardless of whether the software fuse has been programmed. If WP is tied to VSS, software write protection applies only to addresses 00h–7Fh, while 80h–FFh remain writable. The WP pin thus provides a physical, irreversible lock layer above the software fuse.

Can the 24LCS52T-I/SN be used in a system with multiple I²C EEPROMs on the same bus?

Yes - the 24LCS52T-I/SN supports up to eight devices on a single I²C bus using its three hardware address pins (A0, A1, A2). Each device must have a unique combination of these pins tied to VSS or VCC. The 7-bit slave address is formed as '1010' + A2A1A0, enabling individual addressing without software arbitration or bus contention.

What is the maximum page write size supported by the 24LCS52T-I/SN, and what happens if more than that is sent?

The 24LCS52T-I/SN supports a maximum page write size of 16 bytes. If the master transmits more than 16 bytes before issuing a STOP condition, the internal address counter wraps around within the current page boundary (00h–0Fh, 10h–1Fh, etc.), causing earlier bytes to be overwritten. This behavior is defined by the physical page structure and requires application-layer enforcement to avoid unintended data loss.

Does the 24LCS52T-I/SN require an external high-voltage programming supply (VPP) for write operations?

No - the 24LCS52T-I/SN integrates a charge pump circuit that generates the necessary high voltage internally from the standard VCC supply (2.2–5.5V). No external VPP pin or auxiliary supply is required, simplifying board design and eliminating the need for dedicated programming circuitry during normal operation or field updates.