Microchip Technology AT24C64-10PI-2.7

Overview

AT24C64-10PI-2.7 from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) I²C-compatible serial EEPROM with low-voltage operation (2.7V to 5.5V), 32-byte page write capability, hardware write protection via WP pin, and industrial temperature range (–40°C to +85°C). It uses an 8-pin PDIP package and supports up to 100 kHz clock rate at 2.7V for embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the AT24C64-10PI-2.7 datasheet, AT24C64-10PI-2.7 pinout, AT24C64-10PI-2.7 application, or AT24C64-10PI-2.7 equivalent, key selection considerations include VCC operating range compatibility, WP pin functionality for quadrant-level write protection, 32-byte page write timing (max 10 ms), Schmitt-triggered noise-immune SDA/SCL inputs, and cascading support for up to eight devices on one I²C bus.

Technical Context

The AT24C64-10PI-2.7 implements a two-wire (I²C) serial interface with open-drain SDA and edge-triggered SCL, supporting standard-mode (100 kHz) operation at 2.7V. Its internal architecture organizes memory as 256 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data.

Device addressing uses three hardware-configurable pins (A0–A2) to allow up to eight AT24C64-10PI-2.7 units on a shared bus. The WP pin provides hardware-level inhibition of writes to the upper 16K bits (quadrant protection), while Schmitt-trigger inputs and internal noise filtering ensure robust operation in electrically noisy environments.

Key Specifications

Pinout & Package

AT24C64-10PI-2.7 is housed in an 8-pin JEDEC-standard PDIP (8P3) package, 0.300" wide, suitable for through-hole prototyping and industrial PCBs requiring mechanical robustness and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64-10PI-2.7, the AT24C64D-SSHM-T offers higher I²C speed and smaller footprint but requires PCB redesign, while the CAT24C64WI-GT3 extends temperature capability without layout changes - both retain identical memory architecture and WP functionality.

Availability

AT24C64-10PI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and medical device data logging requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.

Supply support for AT24C64-10PI-2.7 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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on reliability, longevity, and industrial-grade performance.

The AT24C64-10PI-2.7 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for low-power, noise-immune, and cascaded I²C memory expansion in resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C64-10PI-2.7?

The AT24C64-10PI-2.7 supports up to 100 kHz I²C clock frequency when operated within its specified 2.7V to 5.5V supply range. This limitation applies across the full industrial temperature range (–40°C to +85°C) and is characterized per AC specifications in the official datasheet. Higher frequencies (e.g., 400 kHz) require 5V operation and are not guaranteed for the AT24C64-10PI-2.7 variant.

Does the AT24C64-10PI-2.7 support page write operations, and what is the page size?

Yes, the AT24C64-10PI-2.7 supports 32-byte page write operations, allowing up to 32 bytes to be written in a single self-timed cycle. The internal memory is organized into 256 pages of 32 bytes each, and partial page writes are permitted - meaning fewer than 32 bytes can be written without affecting adjacent locations in the same page.

How does the Write Protect (WP) pin function on the AT24C64-10PI-2.7?

On the AT24C64-10PI-2.7, the WP pin provides hardware-level write protection for the upper 16K bits (quadrant) of memory. When WP is tied to VCC, writes to addresses 0x2000–0x3FFF are inhibited; when grounded, full memory access is enabled. If left unconnected, an internal pull-down ensures normal write capability by default.

What package type is used for the AT24C64-10PI-2.7, and is it RoHS compliant?

The AT24C64-10PI-2.7 uses an 8-pin PDIP (Plastic Dual Inline Package), designated as 8P3 per Microchip's ordering information. It is RoHS compliant and lead-free, consistent with Microchip's standard industrial-grade packaging for through-hole assembly. Full compliance documentation is available in Microchip's official product change notices.

Can multiple AT24C64-10PI-2.7 devices share the same I²C bus, and how is addressing managed?

Yes, up to eight AT24C64-10PI-2.7 devices can share a single I²C bus using hardware-addressable pins A0, A1, and A2. Each pin can be hardwired to VCC or GND (or left floating, defaulting to low) to generate a unique 3-bit device address. This enables deterministic addressing without software configuration or external address translation logic.