Microchip Technology AT24C64-10PI-1.8

Overview

AT24C64-10PI-1.8 from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) I²C-compatible serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 5.5 V, supports 100 kHz clock rate at 1.8 V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention. It is commonly used in industrial sensor calibration storage and power-management configuration memory.

For engineers reviewing the AT24C64-10PI-1.8 datasheet, AT24C64-10PI-1.8 pinout, AT24C64-10PI-1.8 application, or AT24C64-10PI-1.8 equivalent, key selection considerations include its 1.8 V minimum supply, 32-byte page write capability, Schmitt-triggered SDA/SCL inputs for noise immunity, and PDIP-8 packaging suitable for prototyping and legacy board designs.

Technical Context

The AT24C64-10PI-1.8 implements a standard two-wire I²C interface with bidirectional open-drain SDA and edge-triggered SCL, supporting device addressing via A0–A2 pins to enable up to eight devices on one bus. Its internal architecture organizes memory as 256 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data.

It uses a proprietary internal bias circuit on A0–A2 to default to logic low when unconnected, and integrates a low-VCC detector to prevent data corruption during brown-out conditions. The WP pin provides hardware-level protection for the upper quadrant (16 Kbits) of memory when driven high.

Key Specifications

Pinout & Package

AT24C64-10PI-1.8 is supplied in an 8-pin JEDEC-standard Plastic Dual Inline Package (PDIP), 0.300" wide body (package code 8P3), suitable for through-hole prototyping and industrial control boards requiring mechanical robustness and thermal cycling resilience.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64-10PI-1.8, the AT24C64D-SSHM-T trades PDIP mechanical accessibility for SOIC space savings, while the CAT24C64WI-GT3 adds ESD robustness in TSSOP but requires layout adaptation - all three share identical memory organization and 1.8 V I²C timing, making them functionally aligned for calibration and configuration storage.

Availability

AT24C64-10PI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and embedded power management unit design requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.

Supply support for AT24C64-10PI-1.8 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 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring trusted, long-retention configuration storage in extended temperature environments.

FAQ

What is the maximum clock frequency supported by AT24C64-10PI-1.8 at 1.8 V?

The AT24C64-10PI-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This is explicitly specified in the AC Characteristics table under "1.8-volt" column for fSCL. At higher supply voltages (e.g., 5.0 V), it supports up to 400 kHz, but that rating does not apply to the 1.8 V operation mode of AT24C64-10PI-1.8.

Does AT24C64-10PI-1.8 support page write operations, and what is the page size?

Yes, AT24C64-10PI-1.8 supports 32-byte page write operations. The memory is internally organized as 256 pages of 32 bytes each, and partial page writes are permitted. This allows efficient sequential writes within a page boundary without requiring full-page erasure, reducing total write time compared to byte-by-byte programming.

How does the Write Protect (WP) pin function on AT24C64-10PI-1.8?

On AT24C64-10PI-1.8, the WP pin is active-high: when tied to VCC, it inhibits write operations to the upper quadrant (16 Kbits) of memory; when tied to GND or left unconnected (internally pulled down), full memory access is enabled. This hardware-level protection prevents accidental overwrites of critical calibration or security data without software involvement.

What is the endurance and data retention specification for AT24C64-10PI-1.8?

AT24C64-10PI-1.8 is rated for 1 million write cycles and 100 years of data retention at +25°C. These values are characterized and documented in the Absolute Maximum Ratings and DC Characteristics sections of the official datasheet (Rev. 0336K–SEEPR–7/03), and apply across its full operating voltage and temperature range.

Which package type is used for AT24C64-10PI-1.8, and what are its key mechanical features?

AT24C64-10PI-1.8 uses an 8-lead, 0.300" wide Plastic Dual Inline Package (PDIP), designated as package code 8P3. It features through-hole mounting, 0.100" lead pitch, and JEDEC MS-001 compliant dimensions - making it ideal for breadboarding, legacy board upgrades, and applications requiring mechanical durability and thermal cycling resilience.