Microchip Technology AT24C1024-10PI-2.7

Overview

AT24C1024-10PI-2.7 from Microchip Technology (formerly Atmel) is a 1 Mbit (131,072 × 8) two-wire serial EEPROM with 2.7–5.5 V operation, 400 kHz clock rate at 2.7 V, hardware write protection via WP pin, and 256-byte page write capability. It serves as nonvolatile configuration storage in embedded controllers, power management units, and industrial sensor nodes requiring long-term data retention.

For engineers reviewing the AT24C1024-10PI-2.7 datasheet, AT24C1024-10PI-2.7 pinout, AT24C1024-10PI-2.7 application, or AT24C1024-10PI-2.7 equivalent, key selection criteria include I²C timing compliance at 2.7 V, WP pin behavior under floating conditions, 17-bit addressing support, and compatibility with cascaded bus topologies up to two devices.

Technical Context

The AT24C1024-10PI-2.7 implements a standard I²C-compatible two-wire interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. Its internal architecture supports 512 pages of 256 bytes each, requiring a 17-bit word address where the P0 bit is sourced from the A1 pin and the device address byte.

Write operations use either byte-write (single 8-bit word) or page-write (up to 256 bytes) modes, with self-timed internal write cycles averaging 5 ms. The WP pin enables hardware-level write inhibition when tied to VCC, while an internal pull-down ensures safe default operation when left unconnected.

Key Specifications

Pinout & Package

AT24C1024-10PI-2.7 uses an 8-lead PDIP (package code 8P3) with 0.300" body width, suitable for through-hole prototyping and legacy industrial PCBs. Pin 1 is marked at top-left corner; package dimensions comply with JEDEC MS-001, Variation BA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C1024-10PI-2.7, the AT24C1024-10PU-2.7 requires PCB layout change but guarantees identical functionality, while the CAT24C1024WI-GT3 introduces design complexity via external WP biasing and offers no real benefit unless fast-mode I²C is fully utilized.

Availability

AT24C1024-10PI-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply across extended product lifecycles.

Supply support for AT24C1024-10PI-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 devices, and nonvolatile memory solutions, with a focus on reliability and long-term product support.

The AT24C1024 belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, I²C-based configuration and data logging in harsh industrial and automotive environments.

FAQ

What is the maximum I²C clock frequency supported by AT24C1024-10PI-2.7 at 2.7 V?

The AT24C1024-10PI-2.7 supports a maximum clock frequency of 400 kHz when operated at 2.7 V, as specified in its AC characteristics table. This aligns with standard-mode I²C timing requirements and ensures reliable communication in low-voltage systems without signal integrity compromises. The device does not support fast-mode (1 MHz) operation at 2.7 V - that rating applies only at VCC ≥ 4.5 V. AT24C1024-10PI-2.7 maintains full functionality across its 2.7–5.5 V range, but timing margins tighten below 4.5 V.

How does the WP pin behave when left unconnected on AT24C1024-10PI-2.7?

When the WP pin is left unconnected on AT24C1024-10PI-2.7, it is internally pulled down to GND, enabling normal write operations. This default behavior eliminates the need for an external pull-down resistor in most designs and enhances system robustness against accidental write protection. The internal pull-down ensures AT24C1024-10PI-2.7 remains writable during initial power-up and debug phases unless explicitly disabled via external VCC tie. This feature is documented in the Pin Description section of the datasheet.

Can multiple AT24C1024-10PI-2.7 devices share the same I²C bus?

Yes, up to two AT24C1024-10PI-2.7 devices can share a single I²C bus using the A1 pin for hardware device addressing. The A1 pin serves as the least-significant bit of the 7-bit I²C slave address, allowing differentiation between two units. When A1 is grounded, the device responds to address 0x50; when tied high, it responds to 0x51. Both devices retain identical functionality and timing - no software arbitration or protocol changes are needed beyond address selection. AT24C1024-10PI-2.7 supports this cascading natively without external logic.

What is the typical duration of a write cycle for AT24C1024-10PI-2.7?

The typical write cycle time for AT24C1024-10PI-2.7 is 5 ms, as confirmed in the DC Characteristics table. This self-timed internal operation covers both byte and page writes, during which all inputs are disabled and the device does not acknowledge I²C commands. Host systems must either wait the full tWR (max 10 ms) or use acknowledge polling - sending repeated start + device address sequences until the EEPROM responds with ACK - to detect completion. AT24C1024-10PI-2.7 guarantees this timing across its full operating voltage and temperature range.

Does AT24C1024-10PI-2.7 support partial page writes?

Yes, AT24C1024-10PI-2.7 supports partial page writes: the device accepts any number of bytes (1–256) within a single 256-byte page boundary during one write transaction. The internal address counter increments automatically after each byte, wrapping to the start of the same page upon reaching the boundary. This allows efficient updates of non-contiguous configuration fields without erasing unused portions of the page. AT24C1024-10PI-2.7 enforces no minimum byte count, making it suitable for infrequent single-parameter saves as well as bulk logging.