Microchip Technology 24FC64F-I/ST

Overview

24FC64F-I/ST from Microchip Technology is a 64 Kbit I²C-compatible serial EEPROM organized as 8K × 8-bit memory, operating from 1.7V to 5.5V with 1 MHz max clock frequency (at V_CC ≥ 2.5V), 32-byte page write buffer, and hardware write-protect for upper 1/4 array (1800h–1FFFh). It supports industrial temperature range (−40°C to +85°C) and is used in low-power embedded systems for parameter storage, calibration data retention, and firmware configuration.

For engineers reviewing the 24FC64F-I/ST datasheet, 24FC64F-I/ST pinout, 24FC64F-I/ST application, or 24FC64F-I/ST equivalent, key selection criteria include its 1 MHz I²C speed at 1.7V+, 1 μA standby current, Schmitt-trigger noise immunity on SDA/SCL, cascading support via A0–A2 address pins, and TSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The 24FC64F-I/ST implements a standard I²C slave interface with fixed 7-bit device address prefix '1010' and three programmable chip-select bits (A2/A1/A0), enabling up to eight devices on one bus. Its internal address pointer auto-increments during sequential reads and wraps from 1FFFh to 0000h.

Write operations are self-timed: byte writes complete in ≤5 ms; page writes (up to 32 bytes within same physical page) also require ≤5 ms. The WP pin enables hardware-level protection of the upper 16 Kbits (1800h–1FFFh); read access remains fully functional regardless of WP state.

Key Specifications

Pinout & Package

24FC64F-I/ST is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA64F-I/ST and AT24C64D-SSHM-T, the 24FC64F-I/ST uniquely delivers 1 MHz I²C performance at 1.7V while maintaining industrial temperature rating and dedicated hardware write-protect - making it optimal for time-critical, ruggedized embedded systems.

Availability

24FC64F-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic devices, automotive body control modules, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for 24FC64F-I/ST 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24FC64F belongs to Microchip's 24XX64F family of serial EEPROMs engineered for ultra-low-power, high-reliability nonvolatile storage in space- and energy-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24FC64F-I/ST?

The 24FC64F-I/ST supports up to 1 MHz I²C clock frequency when V_CC is ≥2.5V. At 1.7V ≤ V_CC < 2.5V, maximum clock is 400 kHz. This dual-speed capability allows seamless integration across both legacy and high-performance I²C systems. The 24FC64F-I/ST datasheet specifies timing parameters (e.g., THIGH, TLOW) separately for each voltage band to ensure reliable operation.

Does the 24FC64F-I/ST have hardware write-protection, and how is it implemented?

Yes, the 24FC64F-I/ST features a dedicated Write-Protect (WP) pin that, when tied to V_CC, disables write operations to the upper 1/4 memory array (addresses 1800h–1FFFh). Read access remains fully enabled. The WP state is sampled at the Stop bit of each write command, ensuring deterministic protection behavior. This hardware lock eliminates reliance on software flags vulnerable to corruption.

What package type is used for the 24FC64F-I/ST, and what are its key mechanical dimensions?

The 24FC64F-I/ST uses an 8-lead TSSOP package (3.0 mm × 4.4 mm body, 0.65 mm lead pitch). It complies with JEDEC MO-153 standards and features gull-wing leads for automated optical inspection. The package marking includes "4FBF" as the top-side code, "I" for industrial temperature grade, and date code per Microchip's DS22154B specification.

How many devices can be connected on the same I²C bus using the 24FC64F-I/ST?

Up to eight 24FC64F-I/ST devices can share a single I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit slave addresses. Each pin must be hardwired to VSS or VCC; floating connections are not permitted. This enables scalable memory expansion up to 512 Kbits without additional address decoding logic.

What is the endurance and data retention specification for the 24FC64F-I/ST?

The 24FC64F-I/ST guarantees 1,000,000 erase/write cycles per memory location and data retention exceeding 200 years at +85°C ambient. These specifications are validated per Microchip's characterization methodology and apply across the full industrial temperature range (−40°C to +85°C), ensuring long-term reliability in demanding embedded applications.