Microchip Technology 24LC64FT-I/OT

Overview

24LC64FT-I/OT from Microchip Technology 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-protect for the upper 1/4 array (1800h–1FFFh), 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity. Used in embedded systems for parameter storage, calibration data retention, and configuration backup.

For engineers reviewing the 24LC64FT-I/OT datasheet, 24LC64FT-I/OT pinout, 24LC64FT-I/OT application, or 24LC64FT-I/OT equivalent, key selection considerations include VCC min (2.5V), I²C bus compatibility (100/400 kHz), WP-enabled quarter-array protection, standby current (1 µA max), and TSSOP-8 package footprint constraints.

Technical Context

The 24LC64FT-I/OT implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A2–A0), enabling up to eight devices on one bus. Its internal address pointer supports current-address, random, and sequential read modes, with automatic rollover at 1FFFh.

Write operations use self-timed erase/write cycles with 5 ms typical page write time. Acknowledge polling is supported to detect write completion without fixed delay timing. The WP pin is sampled at the Stop bit of each write command to enforce hardware-level protection of addresses 1800h–1FFFh.

Key Specifications

Pinout & Package

24LC64FT-I/OT is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm body, 0.65 mm pitch), RoHS-compliant and Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC64FT-I/OT, the 24AA64FT-I/OT extends low-voltage operation but sacrifices high-speed I²C capability below 2.5V, while the AT24C64D replaces hardware WP with flexible software lock and higher endurance-making it preferable for applications needing dynamic protection control or extended field life.

Availability

24LC64FT-I/OT is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, smart meter firmware settings, and automotive body control modules requiring stable component supply, long-term data retention, and automotive-grade temperature performance.

Supply support for 24LC64FT-I/OT 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 operations.

The 24LC64F series belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power nonvolatile data storage in resource-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the minimum VCC voltage required for reliable operation of the 24LC64FT-I/OT?

The 24LC64FT-I/OT requires a minimum VCC of 2.5V for full functionality, including 400 kHz I²C operation and guaranteed read/write timing. Operation below 2.5V is not specified and may result in undefined behavior, unlike the 24AA64F variant which supports down to 1.7V. Always maintain VCC within 2.5V–5.5V per the datasheet limits.

How does the WP pin protect memory in the 24LC64FT-I/OT?

The WP pin on the 24LC64FT-I/OT enables hardware write-protection for the upper 1/4 of the memory array (addresses 1800h–1FFFh) when held high (VCC). It is sampled at the STOP bit of each write command; if asserted, write attempts to that region are ignored while reads remain fully functional. This provides immutable storage for critical firmware parameters without software overhead.

Can multiple 24LC64FT-I/OT devices share the same I²C bus?

Yes, up to eight 24LC64FT-I/OT devices can operate on a single I²C bus using the A0, A1, and A2 address pins to configure unique 7-bit slave addresses (1010xxx0/1). Each device must have a distinct combination of A0–A2 tied to VSS or VCC; floating address pins are not permitted and will cause bus contention or unpredictable addressing.

What is the maximum write speed achievable with the 24LC64FT-I/OT?

The 24LC64FT-I/OT supports a maximum I²C clock frequency of 400 kHz, enabling theoretical peak write throughput of ~40 KB/s for page writes. However, the internal write cycle time is 5 ms typical per page (32 bytes), limiting sustained write bandwidth to ~6.4 KB/s. For optimal performance, use page writes aligned to 32-byte boundaries and implement acknowledge polling to minimize idle bus time.

Is the 24LC64FT-I/OT compatible with standard I²C protocol implementations?

Yes, the 24LC64FT-I/OT is fully compliant with the standard Philips I²C protocol specification, supporting START/STOP conditions, 7-bit addressing, ACK/NACK handshaking, and repeated START. It uses the fixed control code '1010' followed by three chip-select bits and R/W bit, ensuring interoperability with all standard I²C masters including microcontrollers, FPGAs, and SoCs without custom driver modifications.