Microchip Technology AT24C64-10TI-1.8

Overview

AT24C64-10TI-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 1.8V to 5.5V, supports 100 kHz clock rate at 1.8V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention. It is used in industrial sensor calibration storage and firmware parameter backup.

For engineers reviewing the AT24C64-10TI-1.8 datasheet, AT24C64-10TI-1.8 pinout, AT24C64-10TI-1.8 application, or AT24C64-10TI-1.8 equivalent, key selection criteria include 1.8V minimum supply compatibility, TSSOP-8 package footprint, 32-byte page write capability, Schmitt-trigger noise immunity on SDA/SCL, and quadrant-level hardware write protection.

Technical Context

The AT24C64-10TI-1.8 implements a standard two-wire I²C interface with open-drain SDA and input-clocked SCL, supporting bidirectional data transfer under strict timing constraints (tLOW = 4.7 µs, tHIGH = 4.0 µs at 1.8V). Its internal address decoder uses A0–A2 pins to support up to eight devices on one bus.

Memory is organized as 256 pages of 32 bytes each, enabling partial-page writes without erasing adjacent data. The device enters self-timed write cycle (max 10 ms) after STOP, during which all inputs are disabled and acknowledge polling is required to confirm completion.

Key Specifications

Pinout & Package

AT24C64-10TI-1.8 is housed in an 8-pin Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, with 0.65 mm lead pitch and 4.4 mm body width - suitable for high-density PCB layouts requiring compact nonvolatile memory.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95640-DRMN6TP/K, AT24C64-10TI-1.8 provides native I²C compatibility and 1.8V operation essential for modern ultra-low-power systems; compared with BR24G64FJ-WE2, it offers lower cost and proven qualification history in industrial control, though with reduced endurance and narrower temperature rating.

Availability

AT24C64-10TI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control applications requiring stable component supply and long-term obsolescence management.

Supply support for AT24C64-10TI-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 embedded control and connectivity.

The AT24C64-10TI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power nonvolatile data storage in space-constrained industrial and automotive systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C64-10TI-1.8 at 1.8V?

The AT24C64-10TI-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8V. This is specified in the AC Characteristics table under "1.8-volt" column for fSCL. Higher frequencies (up to 400 kHz) are only guaranteed at 5.0V supply - using faster clocks at 1.8V may result in timing violations and communication failures. Always verify timing margins with actual bus capacitance and pull-up strength in your design.

Does AT24C64-10TI-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C64-10TI-1.8 requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. The datasheet specifies typical values of 2.2 kΩ to 10 kΩ depending on bus speed and capacitance. For 100 kHz operation at 1.8V, a 4.7 kΩ pull-up is commonly used to ensure proper rise time (tR ≤ 1.0 µs) while minimizing power consumption - critical for battery-powered applications using AT24C64-10TI-1.8.

How does the WP pin function on AT24C64-10TI-1.8, and what memory region does it protect?

The WP (Write Protect) pin on AT24C64-10TI-1.8 is active-high: when tied to VCC, it inhibits write operations to the upper quadrant (16K bits, addresses 0x2000–0x3FFF) of the 64Kbit memory array. When grounded or left floating (internally pulled down), full memory access is enabled. This allows safe storage of immutable calibration data or firmware signatures in the protected region while permitting runtime updates to user-configurable parameters elsewhere - a key feature implemented in AT24C64-10TI-1.8 for functional safety compliance.

What is the write cycle time for AT24C64-10TI-1.8, and how should firmware handle it?

The maximum write cycle time for AT24C64-10TI-1.8 is 10 ms, as specified in the AC Characteristics table under tWR. During this period, the device ignores all I²C commands. Firmware must either wait the full 10 ms after each write command or use acknowledge polling - sending repeated START + device address until the EEPROM responds with ACK. Polling is preferred for efficiency, especially in time-critical applications, and is fully supported by AT24C64-10TI-1.8's internal state machine.

Is AT24C64-10TI-1.8 pin-compatible with other packages in the AT24C64 family, such as SOIC or PDIP variants?

Yes, AT24C64-10TI-1.8 is functionally and electrically pin-compatible with other AT24C64 variants including AT24C64N-10SI-1.8 (SOIC) and AT24C64-10PI-1.8 (PDIP), sharing identical pin functions (A0–A2, SDA, SCL, WP, GND, VCC) and electrical specifications. However, the TSSOP-8 package has different mechanical dimensions and soldering requirements - PCB layout and reflow profile must be adjusted accordingly. No changes to firmware or schematic logic are needed when substituting AT24C64-10TI-1.8 for these variants.