Microchip Technology AT24C1024C1-10CI-2.7

Overview

AT24C1024C1-10CI-2.7 from Microchip Technology (formerly Atmel) is a 1 Mbit (131,072 × 8) two-wire serial EEPROM with hardware write protection, 256-byte page write capability, and operation from 2.7V to 5.5V. It supports up to 400 kHz clock rate at 2.7V, features Schmitt-trigger inputs for noise immunity, and delivers 100,000 write cycles per page with 40-year data retention. It is used in industrial sensor calibration storage and embedded system configuration memory.

For engineers reviewing the AT24C1024C1-10CI-2.7 datasheet, AT24C1024C1-10CI-2.7 pinout, AT24C1024C1-10CI-2.7 application, or AT24C1024C1-10CI-2.7 equivalent, key selection criteria include 2.7V–5.5V supply compatibility, 256-byte page write timing, WP pin hardware protection behavior, and 8-lead LAP (8CN1) package footprint alignment with space-constrained PCB layouts.

Technical Context

The AT24C1024C1-10CI-2.7 implements a standard I²C-compatible two-wire interface with open-drain SDA and edge-triggered SCL, supporting both byte and page write modes. Its internal 17-bit address counter enables random and sequential read operations across 512 pages of 256 bytes each.

Device addressing uses A1 as a single hardware-selectable bit, allowing up to two AT24C1024 devices on one bus. The WP pin provides hardware-level write inhibition when tied to VCC, while floating defaults to GND enabling writes - a design choice critical for field-upgrade safety in deployed systems.

Key Specifications

Pinout & Package

AT24C1024C1-10CI-2.7 is packaged in an 8-lead Leadless Array Package (LAP), type 8CN1 (8 × 5 × 1.04 mm body, 1.27 mm pitch), with exposed pad not electrically connected. This RoHS-compliant surface-mount package supports automated assembly and thermal performance suitable for industrial temperature range (-40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C1024C1-10CI-2.7, the AT24C1024-10PI-2.7 offers identical electrical behavior in a through-hole package for lab validation, while CAT24C1024WI-GT3 trades guaranteed 400 kHz low-voltage operation for doubled endurance - making it preferable for high-cycle manufacturing test fixtures but less ideal for field-deployed 2.7V systems requiring responsive configuration writes.

Availability

AT24C1024C1-10CI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, and smart meter firmware parameter tables requiring stable component supply across extended product lifecycles.

Supply support for AT24C1024C1-10CI-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 is a global semiconductor company specializing in microcontrollers, analog components, and nonvolatile memory solutions, with a focus on industrial, automotive, and communications markets.

The AT24C1024 series belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, and pin-efficient nonvolatile data storage in resource-constrained embedded systems operating across wide temperature ranges.

FAQ

What is the maximum clock frequency supported by AT24C1024C1-10CI-2.7 at 2.7V?

The AT24C1024C1-10CI-2.7 supports a maximum clock frequency of 400 kHz when operated at 2.7V. This value is specified in the AC Characteristics table of the official datasheet (Rev. 1471I–SEEPR–7/03) and reflects the guaranteed timing margin for reliable communication under worst-case low-voltage conditions. Exceeding this rate may result in SDA setup/hold violations or failed acknowledge cycles.

Does AT24C1024C1-10CI-2.7 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C1024C1-10CI-2.7 requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input without internal pull-ups. The datasheet specifies RL = 1.3 kΩ for 2.7V and 5V operation. Proper pull-up sizing ensures rise times ≤300 ns and meets I²C bus timing requirements across temperature and capacitive loading.

How does the WP pin function on AT24C1024C1-10CI-2.7 when left unconnected?

When the WP pin of AT24C1024C1-10CI-2.7 is left unconnected, it is internally pulled down to GND, enabling normal write operations. This default behavior simplifies design for applications where write protection is not required. To inhibit writes, WP must be actively driven high to VCC; floating or high-impedance states do not activate protection.

What package type is used for AT24C1024C1-10CI-2.7, and what are its key mechanical dimensions?

AT24C1024C1-10CI-2.7 uses the 8-lead Leadless Array Package (LAP), type 8CN1. Its body measures 8.00 mm × 5.00 mm × 1.04 mm nominal, with 1.27 mm lead pitch and exposed pad (non-functional). Pin 1 is marked at the top-left corner in bottom view, and the package complies with JEDEC MO-220 standards for surface-mount reliability and thermal performance.

Can AT24C1024C1-10CI-2.7 be used alongside other I²C devices on the same bus without address conflict?

Yes, AT24C1024C1-10CI-2.7 supports multi-device I²C bus sharing via its A1 pin, which provides one hardware-selectable address bit. When combined with the fixed 5-bit prefix of the device address, this allows up to two AT24C1024C1-10CI-2.7 units (or one AT24C1024C1-10CI-2.7 and one AT24C512) to coexist on the same bus without address collision, provided A1 is hardwired to opposite logic levels.