Microchip Technology AT24C64N-10SC-1.8

Overview

AT24C64N-10SC-1.8 from Microchip Technology (formerly Atmel) is a 64 Kbit (8192 × 8) I²C-compatible serial EEPROM optimized for ultra-low-voltage operation down to 1.8 V, featuring 32-byte page write capability, hardware write protection via WP pin, and 100 kHz I²C bus speed at 1.8 V. It serves as nonvolatile configuration storage in battery-powered IoT sensors and portable medical devices requiring extended data retention.

For engineers reviewing the AT24C64N-10SC-1.8 datasheet, AT24C64N-10SC-1.8 pinout, AT24C64N-10SC-1.8 application, or AT24C64N-10SC-1.8 equivalent, key selection criteria include 1.8 V minimum supply compatibility, 10 ms max write cycle time, 0.1 µA standby current at 1.8 V, and 8-pin SOIC (8S1) package footprint with A0–A2 address pins for multi-device bus addressing.

Technical Context

The AT24C64N-10SC-1.8 implements a standard two-wire I²C interface with open-drain SDA/SCL pins, Schmitt-trigger inputs for noise immunity, and bidirectional data transfer protocol compliant with I²C specification timing requirements. Its internal architecture organizes memory as 256 pages of 32 bytes each, supporting both byte and page write modes with automatic address incrementing within pages.

Hardware write protection is implemented via the WP pin: tied to VCC, it inhibits writes to the upper quadrant (16 Kbits); left unconnected or grounded, full memory access is enabled. The device uses an internal low-VCC detector to prevent data corruption during brown-out conditions and supports acknowledge polling to monitor write completion without fixed delay timing.

Key Specifications

Pinout & Package

AT24C64N-10SC-1.8 is housed in an 8-pin JEDEC SOIC package (package code 8S1), 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by a beveled corner or notch on the package top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C64-WMN6TP and BR24G64FJ-3GE2, the AT24C64N-10SC-1.8 offers the lowest standby current at 1.8 V and deterministic hardware write protection, making it optimal for energy-constrained, safety-critical configurations where pin-level control and minimal leakage are mandatory.

Availability

AT24C64N-10SC-1.8 is available at Aetrix Electronics and suitable for smart metering modules, wearable health monitors, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended product lifecycles.

Supply support for AT24C64N-10SC-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 memory solutions, with a focus on reliability, longevity, and embedded system integration.

The AT24C64N-10SC-1.8 belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for low-voltage, low-power nonvolatile data storage in space-constrained industrial and consumer electronics.

FAQ

What is the maximum I²C clock frequency supported by AT24C64N-10SC-1.8 at 1.8 V?

The AT24C64N-10SC-1.8 supports a maximum I²C clock frequency of 100 kHz when operated at 1.8 V. This is specified in the AC Characteristics table under "1.8-volt" column for parameter fSCL. Higher frequencies (up to 400 kHz) are only guaranteed at VCC ≥ 2.5 V. Designers must configure their I²C master accordingly to ensure timing compliance and reliable communication with the AT24C64N-10SC-1.8.

Does AT24C64N-10SC-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C64N-10SC-1.8 requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time. The device's Schmitt-trigger inputs tolerate slow edges, but proper pull-ups are essential for valid logic levels and noise immunity. No internal pull-ups are provided in the AT24C64N-10SC-1.8.

How does the WP pin function on AT24C64N-10SC-1.8?

On AT24C64N-10SC-1.8, the WP (Write Protect) pin is active-high: when tied to VCC, it disables write operations to the upper quadrant (16 Kbits) of memory; when grounded or left unconnected (internally pulled down), full memory write access is enabled. This provides hardware-level protection against accidental overwrites of critical configuration data without requiring firmware intervention.

What is the endurance rating of AT24C64N-10SC-1.8, and how is it tested?

The AT24C64N-10SC-1.8 is rated for 1 million write cycles per memory location, verified under 5.0 V, 25°C, and page-mode operation per the manufacturer's endurance test methodology. This specification reflects guaranteed minimum performance across the full operating temperature range and applies to both byte and page write operations. Endurance is not degraded by partial-page writes or mixed read/write workloads.

Is AT24C64N-10SC-1.8 compatible with standard I²C protocol implementations?

Yes, AT24C64N-10SC-1.8 fully complies with the standard I²C bus protocol, including START/STOP condition generation, 7-bit slave addressing with R/W bit, ACK/NACK handshaking, and sequential read/write behavior. It supports standard I²C timing parameters (e.g., tLOW, tHIGH, tSU.STA) at 100 kHz for 1.8 V operation, ensuring interoperability with any I²C master - including microcontrollers, FPGAs, and SoCs - without custom driver modifications.