Microchip Technology AT24C64B-10TU-1.8

Overview

AT24C64B-10TU-1.8 from Microchip Technology is a 64-Kbit I²C-compatible serial EEPROM organized as 8,192 × 8 bits, operating from 1.8V to 5.5V with industrial temperature range (−40°C to +85°C), 400 kHz Fast-mode I²C interface, and hardware write-protection for the upper 16 Kb quadrant. It is used in embedded systems for firmware parameter storage, calibration data retention, and configuration backup.

For engineers reviewing the AT24C64B-10TU-1.8 datasheet, AT24C64B-10TU-1.8 pinout, AT24C64B-10TU-1.8 application, or AT24C64B-10TU-1.8 equivalent, key selection criteria include low-voltage operation down to 1.8 V, 32-byte page write capability with ≤5 ms self-timed write cycle, 1 M write-cycle endurance, 100-year data retention, and TSSOP-8 package compatibility with I²C bus noise immunity via Schmitt-trigger inputs.

Technical Context

The AT24C64B-10TU-1.8 implements a two-wire I²C slave interface with bidirectional SDA and unidirectional SCL, supporting Standard (100 kHz) and Fast (400 kHz) modes across 1.8–5.5 V. Its memory is partitioned into 256 pages of 32 bytes each, enabling partial page writes and sequential/random reads.

Hardware address inputs A0–A2 allow up to eight devices on one bus; WP pin enables hardware-level protection of addresses 0x1800–0x1FFF. Internal power-on reset (POR) and strong internal pull-downs on A0/A1/A2/WP ensure robust initialization and floating-pin tolerance, with recommended external biasing for noise immunity.

Key Specifications

Pinout & Package

AT24C64B-10TU-1.8 is housed in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64B-10TU-1.8, the M24C64-WMN6TP trades industrial temperature and hardware write protection for lower unit cost, while the CAT24C64WI-GT3 matches environmental specs but introduces address-map incompatibility requiring validation of all I²C transaction sequences.

Availability

AT24C64B-10TU-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, smart meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for AT24C64B-10TU-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24C64B-10TU-1.8 belongs to Microchip's AT24Cxx family of I²C EEPROMs, engineered for ultra-low-power, high-reliability nonvolatile storage in resource-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the maximum I²C clock frequency supported by the AT24C64B-10TU-1.8?

The AT24C64B-10TU-1.8 supports up to 400 kHz in Fast mode across its full 1.8 V to 5.5 V supply range. At 1.8 V, AC timing parameters including tLOW (1300 ns min) and tHIGH (600 ns min) are guaranteed per Microchip's 20006188A datasheet. This enables high-throughput parameter updates without compromising signal integrity in noise-prone environments.

Does the AT24C64B-10TU-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C64B-10TU-1.8 requires external pull-up resistors on both SDA and SCL. The SDA pin is open-drain and must be pulled high (≤10 kΩ recommended at 1.8 V); SCL may be driven or pulled up. Microchip specifies RPUP(max) = 0.8473 × CL for rise-time compliance, with typical values of 10 kΩ at 1.8 V and 1.3 kΩ at 2.5–5.5 V per the datasheet's AC characteristics table.

How does the Write-Protect (WP) pin function on the AT24C64B-10TU-1.8?

When the WP pin of the AT24C64B-10TU-1.8 is tied to VCC, writes to the upper 16 Kb quadrant (addresses 0x1800–0x1FFF) are permanently disabled - a hardware-level lock independent of software state. If left floating, WP is internally pulled down to GND, enabling full-memory writes. Microchip recommends hardwiring WP to avoid capacitive coupling risks in noisy systems.

What is the write endurance and data retention specification for the AT24C64B-10TU-1.8?

The AT24C64B-10TU-1.8 guarantees 1,000,000 write cycles and 100 years of data retention at 55°C, validated per JEDEC standards. These figures apply to the entire 64 Kbit array under specified conditions (TA = 25°C, VCC = 3.3 V for endurance; TA = 55°C for retention). Endurance is measured using page-write operations, and retention assumes no exposure to absolute maximum ratings.

Is the AT24C64B-10TU-1.8 compatible with standard I²C protocol implementations?

Yes, the AT24C64B-10TU-1.8 is fully compliant with the NXP I²C-bus specification v2.1, supporting Start/Stop conditions, 7-bit addressing (1010xxxR/W), ACK/NACK handshaking, and repeated Start. It implements standard byte and page write protocols, random/sequential read modes, and software reset via SCL clocking - all verified in Microchip's application note AN2245 and production-tested across millions of units.