Microchip Technology AT24C64AN-10SU-1.8-T

Overview

AT24C64AN-10SU-1.8-T from Microchip Technology (formerly Atmel) is a 64 Kbit I²C-compatible serial EEPROM organized as 8192 × 8 bits, operating from 1.8 V to 5.5 V, featuring 32-byte page write mode, 400 kHz clock compatibility, and hardware write protection via the WP pin. It is used for nonvolatile parameter storage in embedded controllers, power management units, and sensor calibration modules.

For engineers reviewing the AT24C64AN-10SU-1.8-T datasheet, AT24C64AN-10SU-1.8-T pinout, AT24C64AN-10SU-1.8-T application, or AT24C64AN-10SU-1.8-T equivalent, key selection considerations include 1.8V minimum supply support, 32-byte page write capability, Schmitt-triggered noise-immune inputs, and TSSOP-8 packaging with industrial temperature range (–40°C to +85°C).

Technical Context

The AT24C64AN-10SU-1.8-T implements a two-wire I²C interface with open-drain SDA/SCL pins, internal address decoding using A0–A2 pins (supporting up to eight devices on one bus), and a proprietary input bias circuit that pulls floating address and WP pins low. It uses a cascaded memory architecture with 256 pages of 32 bytes each.

Write operations are self-timed with a maximum 5 ms cycle time; read operations support current-address, random-address, and sequential modes. Acknowledge polling enables host synchronization after writes, and built-in noise filtering on SDA/SCL ensures robust operation in electrically noisy environments.

Key Specifications

Pinout & Package

AT24C64AN-10SU-1.8-T is housed in an 8-lead TSSOP package (JEDEC MO-153, variation AA), 4.4 mm body width, lead-free/halogen-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64AN-10SU-1.8-T, AT24C64D-MAHM-T saves PCB area but removes hardware write protection, while CAT24C64WI-GT3 extends temperature range and cuts standby current by half - both require validation of WP handling and thermal derating in final design.

Availability

AT24C64AN-10SU-1.8-T is available at Aetrix Electronics and suitable for smart metering, industrial automation, medical diagnostics, and automotive body electronics requiring stable component supply and long-lifecycle support.

Supply support for AT24C64AN-10SU-1.8-T 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 AT24C64AN-10SU-1.8-T belongs to Microchip's legacy AT24Cxx serial EEPROM product line, designed for cost-sensitive, low-power, and space-constrained applications requiring reliable nonvolatile storage with simple two-wire interface.

FAQ

What is the maximum I²C clock frequency supported by the AT24C64AN-10SU-1.8-T?

The AT24C64AN-10SU-1.8-T supports up to 400 kHz I²C clock frequency across its full 1.8 V to 5.5 V supply range. This is verified in Table 4 of the datasheet under AC Characteristics and applies to all voltage options including the 1.8V variant. The device meets standard-mode I²C timing requirements with tLOW ≥ 1.2 µs and tHIGH ≥ 0.6 µs, ensuring interoperability with common microcontroller I²C peripherals without custom timing adjustments.

Does the AT24C64AN-10SU-1.8-T have built-in write protection, and how is it enabled?

Yes, the AT24C64AN-10SU-1.8-T includes a dedicated Write Protect (WP) pin. When WP is connected to VCC, all write operations-including byte, page, and erase-are inhibited. When WP is grounded, full read/write access is enabled. If left floating, the pin is internally pulled down to GND under low-capacitance conditions (<3 pF), defaulting to write-enabled mode. This hardware-level protection operates independently of firmware and remains active during power transitions.

What package type and dimensions does the AT24C64AN-10SU-1.8-T use?

The AT24C64AN-10SU-1.8-T uses an 8-lead TSSOP package (JEDEC MO-153, variation AA), with a 4.4 mm body width, 0.65 mm lead pitch, and overall footprint of approximately 3.0 mm × 4.4 mm. Pin 1 is marked by a notch or dot; the package is lead-free, halogen-free, and RoHS compliant, as indicated by the "U" suffix in the ordering code. Full mechanical drawings are provided in the datasheet revision 3054T–SEEPR–1/07, page 18.

How many devices can share the same I²C bus with the AT24C64AN-10SU-1.8-T?

Up to eight AT24C64AN-10SU-1.8-T devices can share a single I²C bus using the A0, A1, and A2 address input pins. Each pin can be hardwired to VCC or GND to set a unique 3-bit device address, yielding 2³ = 8 possible combinations. All devices respond only to their configured address, allowing mixed-density EEPROMs (e.g., AT24C32A and AT24C64A) on the same bus if address bits are coordinated to avoid collision.

What is the typical standby current consumption of the AT24C64AN-10SU-1.8-T at 1.8 V?

The typical standby current (ISB1) of the AT24C64AN-10SU-1.8-T is 1.0 µA at VCC = 1.8 V and TA = 25°C, as specified in Table 3 of the datasheet. This ultra-low quiescent draw enables use in energy-harvesting and battery-operated systems where multi-year operation is required. The value is characterized-not 100% tested-but validated across process corners and represents the expected performance for design margining.