Microchip Technology AT24C64A-10TI-2.7

Overview

AT24C64A-10TI-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 400 kHz clock rate at 1.8V–3.6V, hardware write protection via WP pin, and 32-byte page write capability. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules.

For engineers reviewing the AT24C64A-10TI-2.7 datasheet, AT24C64A-10TI-2.7 pinout, AT24C64A-10TI-2.7 application, or AT24C64A-10TI-2.7 equivalent, key selection criteria include voltage range compatibility (2.7–5.5V), TSSOP-8 package footprint, 400 kHz I²C timing at low VCC, hardware write protect functionality, and 1 million endurance cycles for field-updatable firmware parameter storage.

Technical Context

The AT24C64A-10TI-2.7 implements a two-wire I²C interface with open-drain SDA and edge-triggered SCL, supporting up to eight devices on a shared bus via A0–A2 address inputs. Its internal architecture uses 256 pages of 32 bytes each, with automatic address incrementing during page writes and roll-over behavior at page boundaries.

It features Schmitt-trigger inputs on SDA/SCL for noise immunity, acknowledge polling for write cycle completion detection, and internal pull-down biasing on floating A0–A2 and WP pins when capacitive coupling to VCC is below 3 pF. Standby current is 2.0 µA at 2.7V, enabling use in battery-backed systems.

Key Specifications

Pinout & Package

AT24C64A-10TI-2.7 is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 4.4 mm body width, JEDEC MO-153 compliant, with 0.65 mm lead pitch and exposed pad not present. Pin 1 is marked by a beveled corner.

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 AT24C64A-10TI-2.7 uniquely guarantees 400 kHz I²C operation down to 1.8V while maintaining Schmitt-trigger noise suppression and 2.0 µA standby current at 2.7V - making it optimal for mixed-voltage industrial systems requiring both speed and reliability.

Availability

AT24C64A-10TI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, smart meter firmware parameter tables, medical device configuration profiles, and automotive body control module settings requiring stable component supply across extended product lifecycles.

Supply support for AT24C64A-10TI-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 technical and manufacturing continuity for the AT24Cxx EEPROM family. The company specializes in microcontrollers, analog, and memory solutions for embedded applications.

The AT24C64A belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power nonvolatile data storage in space-constrained industrial and automotive systems where I²C interface simplicity and long-term data integrity are critical.

FAQ

What is the maximum I²C clock frequency supported by AT24C64A-10TI-2.7?

The AT24C64A-10TI-2.7 supports up to 400 kHz I²C clock frequency across its full 1.8V–3.6V supply range. At 4.5–5.5V, the same 400 kHz rating applies. This is confirmed in the AC Characteristics table of the official datasheet (3054N–SEEPR–2/04), where fSCL is specified as 400 kHz for AT24C64A under 1.8V–3.6V conditions. The AT24C64A-10TI-2.7 does not support 1 MHz operation.

Does AT24C64A-10TI-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C64A-10TI-2.7 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. The datasheet specifies that SDA is open-drain driven and may be wire-ORed with other open-drain devices, confirming the necessity of pull-ups. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time; the AT24C64A-10TI-2.7 itself provides no internal pull-ups.

What package type is used for AT24C64A-10TI-2.7?

AT24C64A-10TI-2.7 uses an 8-lead Thin Shrink Small Outline Package (TSSOP), designated as 8A2 in Microchip's ordering information. It measures 4.4 mm body width with 0.65 mm lead pitch and complies with JEDEC MO-153, Variation AA. The "TI" suffix in the part number explicitly denotes the TSSOP package, distinguishing it from PDIP (PI), SOIC (SI), or MAP (YI) variants.

Can AT24C64A-10TI-2.7 operate at 1.8V supply voltage?

No - AT24C64A-10TI-2.7 is the 2.7V version, rated for 2.7V to 5.5V operation only. Although the AT24C64A family includes a -1.8 variant (e.g., AT24C64A-10TI-1.8), the -2.7 suffix indicates guaranteed functionality starting at 2.7V. Attempting to power AT24C64A-10TI-2.7 below 2.7V may result in undefined behavior, failed writes, or incomplete reads, as confirmed by the DC Characteristics table specifying VCC3 = 2.7–5.5V.

How many devices can share the same I²C bus with AT24C64A-10TI-2.7?

Up to eight AT24C64A-10TI-2.7 devices can share a single I²C bus using the A0, A1, and A2 address pins. These three pins provide three binary bits, yielding eight unique device addresses (000 to 111). The datasheet explicitly states: "When the pins are hardwired, as many as eight 32K/64K devices may be addressed on a single bus system." Each AT24C64A-10TI-2.7 must have a distinct A0–A2 combination to avoid address collisions.