Microchip Technology 24LC64F-I/SN

Overview

24LC64F-I/SN from Microchip Technology Inc. is a 64 Kbit I²C-compatible serial EEPROM organized as 8K × 8-bit memory, operating from 2.5V to 5.5V with industrial temperature range (–40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for upper 1/4 array (1800h–1FFFh). It serves as nonvolatile configuration storage in embedded controllers, sensor nodes, and power management systems.

For engineers reviewing the 24LC64F-I/SN datasheet, 24LC64F-I/SN pinout, 24LC64F-I/SN application, or 24LC64F-I/SN equivalent, key selection factors include VCC min (2.5V), I²C clock compatibility (100/400 kHz), page write buffer size (32 bytes), write-protect granularity (quarter-array), and SOIC-8 package footprint.

Technical Context

The 24LC64F-I/SN implements a two-wire I²C slave interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, slope-controlled outputs to suppress ground bounce, and internal address pointer auto-increment for sequential reads. Its control logic supports byte and page write modes, acknowledge polling during write cycles, and hardware-based write protection activated by the WP pin.

It uses CMOS EEPROM technology with self-timed erase/write cycles, requiring no external programming voltage. The device supports cascading up to eight units via A0–A2 address pins and features 1 μA max standby current (I-temp) and 400 μA max read current - optimized for low-power battery-backed applications.

Key Specifications

Pinout & Package

24LC64F-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 1.27 mm pitch, compliant with JEDEC MS-012, and marked "24LC64F I/SN" per Microchip's packaging specification DS22154B-page 13.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC64F-I/SN, the 24AA64F-I/SN enables lower-voltage operation but sacrifices no functionality at 2.5V+, while the AT24C64D-SSHM-T adds 1 MHz capability and extended voltage range - both retain identical SOIC-8 footprint and quarter-array write-protect logic.

Availability

24LC64F-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and embedded controller boot settings requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 24LC64F-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 manufacturing and support infrastructure.

The 24LC64F belongs to Microchip's 24XX64F family of I²C serial EEPROMs designed for low-power, space-constrained embedded systems requiring robust nonvolatile storage with hardware-level data protection.

FAQ

What is the minimum supply voltage for reliable operation of the 24LC64F-I/SN?

The 24LC64F-I/SN requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Unlike the 24AA64F variant, it does not support operation below 2.5V - attempting to power it at 1.8V will result in undefined behavior or failure to respond on the I²C bus. Always verify regulator tolerance and load transient margins to maintain VCC ≥2.5V under all operating conditions.

Does the 24LC64F-I/SN support page write operations, and what is the maximum number of bytes per page?

Yes, the 24LC64F-I/SN supports page write operations with a 32-byte page buffer. This allows up to 32 bytes to be loaded into the internal buffer and written to memory with a single Stop condition. Page boundaries align to 32-byte intervals (e.g., 0000h–001Fh, 0020h–003Fh), and crossing a boundary causes wraparound - software must enforce alignment to avoid unintended overwrites.

How does the write-protect (WP) pin function on the 24LC64F-I/SN?

The WP pin on the 24LC64F-I/SN enables hardware write-protection for the upper 1/4 memory array (addresses 1800h–1FFFh) when pulled high to VCC. When WP = VSS, full array write access is permitted. Protection is sampled at the Stop bit of each write command - toggling WP during an active write cycle has no effect. This feature safeguards critical configuration data without firmware involvement.

Is the 24LC64F-I/SN pin-compatible with other members of the 24XX64F family?

Yes, the 24LC64F-I/SN shares identical SOIC-8 pinout, signal definitions, and memory organization with 24AA64F-I/SN and 24FC64F-I/SN. All three support A0–A2 addressing, SDA/SCL/I²C protocol, and WP functionality. However, voltage range and clock speed differ: 24LC64F-I/SN is limited to 2.5–5.5V and 400 kHz, whereas 24AA64F supports 1.7V and 24FC64F supports 1 MHz.

What is the endurance rating and data retention specification for the 24LC64F-I/SN?

The 24LC64F-I/SN is rated for more than 1,000,000 erase/write cycles and guarantees data retention exceeding 200 years at +85°C ambient temperature. These specifications are validated per Microchip's characterization methodology and apply to standard operating conditions (VCC = 2.5–5.5V, TA = –40°C to +85°C). Endurance may vary slightly with voltage/temperature extremes but remains well above typical embedded application requirements.