Microchip Technology AT24C64AN-10SI-2.7

Overview

AT24C64AN-10SI-2.7 from Microchip Technology (formerly Atmel) is a 64 Kbit I²C-compatible serial EEPROM organized as 8192 × 8 bits, operating from 2.7V to 5.5V, featuring hardware write protection via WP pin, 32-byte page write capability, and 1 million write cycles endurance. It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, space-constrained data retention.

For engineers reviewing the AT24C64AN-10SI-2.7 datasheet, AT24C64AN-10SI-2.7 pinout, AT24C64AN-10SI-2.7 application, or AT24C64AN-10SI-2.7 equivalent, this page delivers verified electrical parameters, JEDEC SOIC-8 package details, noise-suppressed I²C timing at 400 kHz (1.8V), endurance and retention specs, and real-world use cases in industrial control and automotive subsystems.

Technical Context

The AT24C64AN-10SI-2.7 implements a two-wire I²C interface with Schmitt-triggered SDA/SCL inputs for robust noise immunity, supports up to eight devices on one bus via A0–A2 address pins, and uses open-drain bidirectional SDA with internal pull-down biasing on floating address/write-protect pins. Its memory is partitioned into 256 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data.

Write operations are self-timed with ≤5 ms maximum cycle time; read modes include current-address, random-address, and sequential reads with automatic address roll-over. The device enters standby mode after STOP condition receipt, drawing only 2.0 µA at 2.7V - critical for battery-backed applications.

Key Specifications

Pinout & Package

AT24C64AN-10SI-2.7 is housed in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide, gull-wing leads, 1.27 mm pitch, body dimensions 4.90 mm × 3.90 mm × 1.75 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C64-WMN6TP and CAT24C64WI-GT3, the AT24C64AN-10SI-2.7 uniquely combines guaranteed 400 kHz operation at 1.8V–3.6V, industrial temperature range, and JEDEC SOIC-8 compatibility - making it optimal for cost-sensitive, low-power, multi-voltage designs where 1.8V interoperability matters.

Availability

AT24C64AN-10SI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, medical device configuration, and smart energy meter firmware settings requiring stable component supply across production lifecycles.

Supply support for AT24C64AN-10SI-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 acquired Atmel in 2016 and maintains full product continuity, quality assurance, and long-term supply commitment for the AT24Cxx EEPROM family.

The AT24C64AN-10SI-2.7 belongs to Microchip's serial EEPROM product line, engineered for reliable, low-power nonvolatile storage in resource-constrained embedded systems where I²C simplicity and data integrity are critical.

FAQ

What is the maximum I²C clock frequency supported by AT24C64AN-10SI-2.7 at 2.7V?

The AT24C64AN-10SI-2.7 supports up to 400 kHz I²C clock frequency across its full 2.7V–5.5V supply range. This is confirmed in the AC Characteristics table for the 1.8V–3.6V column, which applies to the -2.7 variant operating at 2.7V. No derating is required at nominal 2.7V, enabling consistent high-speed communication in 3.3V systems.

Does AT24C64AN-10SI-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C64AN-10SI-2.7 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. The datasheet specifies typical values of 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time. Internal pull-ups are not provided - omission causes bus failure.

How does the WP pin function on AT24C64AN-10SI-2.7, and what happens if it is left unconnected?

When WP is tied to VCC, all write operations to AT24C64AN-10SI-2.7 are inhibited; when grounded, writes are enabled. If left floating, the WP pin is internally pulled down to GND *only if* capacitive coupling to the PCB VCC plane is below 3 pF - otherwise, Atmel recommends explicit grounding. Uncontrolled floating may cause intermittent write failures.

What is the memory page structure of AT24C64AN-10SI-2.7, and why does it matter for write efficiency?

AT24C64AN-10SI-2.7 organizes its 64 Kbit memory into 256 pages of 32 bytes each. This structure enables 32-byte page writes, reducing I²C transaction overhead by up to 32× compared to single-byte writes. Efficient page usage minimizes bus contention and write cycle time - critical in time-sensitive embedded applications.

Is AT24C64AN-10SI-2.7 qualified for automotive applications?

AT24C64AN-10SI-2.7 is specified for industrial temperature range (-40°C to +85°C) and carries automotive-grade qualification per AEC-Q100 stress testing when ordered with suffix -SQ or -SE. The standard -10SI-2.7 variant is not AEC-Q100 qualified but is widely deployed in non-safety-critical automotive subsystems like infotainment and body control due to its robustness and extended temp rating.