Microchip Technology AT24C02C-PUM

Overview

AT24C02C-PUM from Microchip Technology is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), supporting 100 kHz/400 kHz/1 MHz I²C modes and hardware write protection via WP pin - used for configuration storage in embedded controllers, sensor nodes, and power management systems.

For engineers reviewing the AT24C02C-PUM datasheet, AT24C02C-PUM pinout, AT24C02C-PUM application, or AT24C02C-PUM equivalent, key selection criteria include voltage range compatibility (1.7–5.5V), I²C timing mode support (FM+/Fast/Standard), page write capability (8-byte), endurance (1M cycles), and package-specific pin mapping (8-lead PDIP).

Technical Context

The AT24C02C-PUM implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A0/A1/A2/WP pins. It uses an on-chip high-voltage generation circuit for EEPROM programming and features automatic address decoding for up to eight devices on one bus via hardware address pins.

Memory is organized into 32 pages of 8 bytes each, supporting byte-write, page-write (with partial-page capability), random read, and sequential read. Write operations are self-timed with ≤5 ms maximum cycle time and include hardware write protection that disables all writes when WP = V_CC.

Key Specifications

Pinout & Package

AT24C02C-PUM is supplied in an 8-lead PDIP package with through-hole mounting and 0.3-inch body width. Pin functions are standardized across Microchip's AT24Cxx family and validated per DS20006111A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02C-PUM, AT24C02D-PUM offers measurable improvements in ESD tolerance and write speed but shares identical pinout and software interface; M24C02-RMN6TP trades performance and package for lower unit cost and broader distributor availability in SOIC form.

Availability

AT24C02C-PUM is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and embedded controller boot parameter retention requiring stable component supply across extended product lifecycles.

Supply support for AT24C02C-PUM 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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24Cxx series was designed specifically for low-voltage, low-power I²C-based configuration and calibration storage in space-constrained industrial and automotive applications, emphasizing reliability, wide V_CC range, and hardware write protection.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02C-PUM?

The AT24C02C-PUM supports three I²C speed modes: Standard mode (100 kHz), Fast mode (400 kHz), and Fast Mode Plus (1 MHz). The 1 MHz mode requires V_CC ≥ 2.5V. All modes operate across the full 1.7–5.5V supply range where specified, with AC timing parameters validated per DS20006111A Table 4-3.

Does the AT24C02C-PUM require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C02C-PUM requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is an input. Microchip specifies maximum pull-up values of 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation, with recommended values dependent on bus capacitance and rise-time requirements.

How does the write-protect (WP) pin function on the AT24C02C-PUM?

When the WP pin of the AT24C02C-PUM is driven to V_CC, it disables all write operations to the entire memory array. When WP is at GND, normal write operations are permitted. If left floating, WP is internally pulled down to GND - however, Microchip recommends hard-wiring WP to a defined state to prevent noise-induced misoperation in real-world layouts.

What is the memory organization of the AT24C02C-PUM?

The AT24C02C-PUM organizes its 2-Kbit capacity as 256 words of 8 bits each, grouped into 32 pages of 8 bytes. This structure enables efficient page-write operations within each 8-byte boundary and supports both random and sequential read access patterns as defined in Section 6 and 7 of DS20006111A.

Is the AT24C02C-PUM compatible with 1.8V microcontroller I/O interfaces?

Yes, the AT24C02C-PUM operates down to 1.7V and supports I²C Standard and Fast modes at 1.7–2.5V, making it fully compatible with 1.8V logic systems. Its input thresholds (V_IL ≤ 0.3×V_CC, V_IH ≥ 0.7×V_CC) and 6 μA standby current ensure reliable interoperability without level-shifting circuitry in 1.8V domains.