Microchip Technology 24FC64F-I/P

Overview

24FC64F-I/P from Microchip Technology Inc. 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), 5 ms typical page write time, 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 requiring nonvolatile parameter storage.

For engineers reviewing the 24FC64F-I/P datasheet, 24FC64F-I/P pinout, 24FC64F-I/P application, or 24FC64F-I/P equivalent, key selection considerations include its 1 MHz I²C speed at 1.7V+, 32-byte page buffer, Schmitt-trigger inputs for noise immunity, and PDIP-8 package compatibility with legacy through-hole designs.

Technical Context

The 24FC64F-I/P implements a two-wire I²C interface with master-controlled bus arbitration, supporting standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes depending on V_CC. Its internal address counter enables current-address, random, and sequential read operations, while acknowledge polling allows host firmware to detect write completion without fixed delays.

It uses CMOS EEPROM technology with self-timed erase/write cycles, 1 μA max standby current (I-temp), and 400 μA max read current. The device features three hardware address pins (A0–A2), write-protect (WP) input, and open-drain SDA/SCL with built-in slope control and Schmitt-trigger inputs for robust noise suppression.

Key Specifications

Pinout & Package

24FC64F-I/P is supplied in an 8-lead plastic dual in-line package (PDIP) with 0.300-inch body width, compatible with through-hole PCB assembly and legacy socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24FC64F-I/P, the 24AA64F-I/P trades 1 MHz speed for broader legacy compatibility, while the AT24C64D-SSHM-T sacrifices hardware write-protection for smaller footprint-making 24FC64F-I/P optimal for speed-critical, safety-sensitive designs needing physical WP assurance.

Availability

24FC64F-I/P is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.

Supply support for 24FC64F-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 components, 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 battery-operated and harsh-environment applications.

FAQ

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

The 24FC64F-I/P supports up to 1 MHz I²C clock frequency when V_CC is 2.5V or higher. At V_CC between 1.7V and 2.5V, the maximum clock is 400 kHz. This dual-speed capability allows the 24FC64F-I/P to maintain high throughput in modern 3.3V/5V systems while remaining functional in low-voltage battery-backed applications.

Does the 24FC64F-I/P require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC64F-I/P has open-drain SDA and SCL outputs and requires external pull-up resistors. Typical values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz or 1 MHz modes. Proper resistor selection ensures signal rise times meet AC specifications and avoids bus contention in multi-master systems.

How does the hardware write-protect feature work on the 24FC64F-I/P?

The WP pin on the 24FC64F-I/P enables hardware write-protection for the upper 1/4 memory array (addresses 1800h–1FFFh). When WP is tied to VCC, writes to this 2K-byte region are blocked while reads remain fully functional. This protects critical firmware parameters or security keys without requiring software intervention.

What package type is used for the 24FC64F-I/P part number?

The "-I/P" suffix in 24FC64F-I/P denotes the 8-lead plastic dual in-line package (PDIP) with 0.300-inch body width. This through-hole package supports manual prototyping, legacy reflow processes, and socket-based test fixtures-distinct from surface-mount variants like SOIC or TSSOP.

Can multiple 24FC64F-I/P devices share the same I²C bus?

Yes, up to eight 24FC64F-I/P devices can operate on a single I²C bus using the A0, A1, and A2 address pins to configure unique 3-bit slave addresses. Each device must have a distinct combination of these pins tied to VSS or VCC; the PDIP package includes all three pins, enabling full multi-device addressing capability.