Microchip Technology 24LC64F-I/P

Overview

24LC64F-I/P 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 400 kHz max clock frequency and industrial temperature range (–40°C to +85°C). It features hardware write-protection for the upper 1/4 array (1800h–1FFFh), 32-byte page write buffer, and low-power operation (400 µA read current, 1 µA standby).

For engineers reviewing the 24LC64F-I/P datasheet, 24LC64F-I/P pinout, 24LC64F-I/P application, or 24LC64F-I/P equivalent, this device supports reliable nonvolatile data storage in space-constrained embedded systems requiring I²C bus compatibility, robust noise immunity via Schmitt-trigger inputs, and cascaded multi-device addressing up to eight units on one bus.

Technical Context

The 24LC64F-I/P implements a standard two-wire I²C interface with slave-only operation, supporting both byte and page write modes (up to 32 bytes per page), self-timed erase/write cycles, and acknowledge polling for write completion detection. Its internal address pointer enables current-address, random, and sequential read operations across the full 8K-word memory space.

Hardware write protection is controlled by the WP pin: tied to VSS enables full-array writes; tied to VCC disables writes only to addresses 1800h–1FFFh (2 KB), while reads remain unrestricted. Addressing uses three chip-select pins (A0–A2) for up to eight devices on a shared bus - though these pins are absent in SOT-23 variants, the 24LC64F-I/P uses PDIP packaging and includes all three.

Key Specifications

Pinout & Package

24LC64F-I/P is supplied in an 8-lead plastic dual in-line package (PDIP) with 0.300-inch body width, RoHS-compliant matte tin lead finish, and standard through-hole mounting. Pin 1 is marked with a notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA64F-I/P and AT24C64D-SSHM-T, the 24LC64F-I/P uniquely combines guaranteed 2.5V minimum operation, hardware-based quarter-array write protection, and full industrial temperature qualification - making it optimal for cost-sensitive, reliability-critical 3.3V embedded systems where physical pin-level security is preferred over software-managed locks.

Availability

24LC64F-I/P is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, automotive body control modules, and smart home gateways requiring stable component supply and long-term manufacturability.

Supply support for 24LC64F-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24LC64F belongs to Microchip's 24XX64F family of I²C serial EEPROMs, designed specifically for low-power, space-constrained embedded systems needing reliable nonvolatile storage with minimal external components and robust bus noise immunity.

FAQ

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

The 24LC64F-I/P requires a minimum V_CC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Below 2.5V, functionality is not specified - unlike the 24AA64F variant which supports down to 1.7V. This makes the 24LC64F-I/P ideal for stable 3.3V or 5V systems where voltage margin is sufficient.

Does the 24LC64F-I/P support multi-device addressing on a single I²C bus?

Yes, the 24LC64F-I/P supports multi-device addressing via three hardware chip-select pins (A0, A1, A2), allowing up to eight identical devices on one I²C bus. Each device is assigned a unique 3-bit address, enabling contiguous 512 Kbit expansion. The 24LC64F-I/P's PDIP package includes all three pins, unlike SOT-23 variants which omit them.

How does the hardware write-protection feature work on the 24LC64F-I/P?

The 24LC64F-I/P's WP pin enables hardware write-protection for the upper 1/4 memory array (addresses 1800h–1FFFh). When WP is tied to VCC, writes to that region are blocked while reads remain fully functional. When WP is tied to VSS, full-array write access is enabled. The pin is sampled at each Stop condition, providing deterministic, pin-level security independent of firmware state.

What is the maximum I²C clock frequency supported by the 24LC64F-I/P?

The 24LC64F-I/P supports a maximum I²C clock frequency of 400 kHz when V_CC is 2.5V or higher. At lower voltages (not applicable per spec), timing margins would degrade - however, since the 24LC64F-I/P is not rated below 2.5V, 400 kHz is its guaranteed maximum operational speed, aligning with I²C fast-mode standards.

Can the 24LC64F-I/P be used in automotive applications?

The 24LC64F-I/P is qualified for industrial temperature range (–40°C to +85°C), not automotive (–40°C to +125°C). For automotive use, Microchip offers the 24LC64F-E/P variant - identical functionality but with extended temperature qualification and automotive-grade screening. Using the 24LC64F-I/P in under-hood or other high-temp automotive zones is not recommended or guaranteed.