Microchip Technology AT24C01C-PUM

Overview

AT24C01C-PUM from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM organized as 128 × 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 featuring hardware write-protection via WP pin - used for configuration storage in embedded microcontrollers, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the AT24C01C-PUM datasheet, AT24C01C-PUM pinout, AT24C01C-PUM application, or AT24C01C-PUM equivalent, key selection criteria include low-voltage operation down to 1.7V, 8-byte page write capability with ≤5 ms self-timed write cycle, ultra-low standby current (≤6 μA), Schmitt-triggered noise-immune inputs, and support for up to eight devices on one I²C bus via A0–A2 address pins.

Technical Context

The AT24C01C-PUM implements a two-wire I²C slave interface with bidirectional SDA and unidirectional SCL, using internal Schmitt triggers and input filtering for robust noise immunity. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing across its full 1.7V–5.5V VCC range, with automatic pull-down on floating A0/A1/A2/WP pins.

Memory is organized into 16 pages of 8 bytes each, enabling partial-page writes and sequential/random reads. Write protection is implemented via dedicated WP pin tied to VCC (full-array lock) or GND (normal operation), and device reset is managed by an internal Power-on Reset (POR) circuit with 100 µs tPUP delay after stable VCC.

Key Specifications

Pinout & Package

AT24C01C-PUM is supplied in 8-lead PDIP package (0.300" wide), with lead-free, RoHS-compliant finish. Pin 1 is A0 (device address), Pin 4 is GND, Pin 5 is SDA (open-drain bidirectional), Pin 6 is SCL (input clock), Pin 7 is WP (write-protect), and Pin 8 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-PUM, AT24C01C-PUM provides proven industrial reliability with identical pinout and feature set but slightly higher minimum VCC and active current; versus M24C01-RMN6TP, it delivers faster I²C performance, better ESD rating, and lower standby consumption - making it optimal for demanding embedded and industrial applications.

Availability

AT24C01C-PUM is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter firmware configuration, and medical diagnostic device calibration storage requiring stable component supply across multi-year production lifecycles.

Supply support for AT24C01C-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 is a leading provider of microcontroller, analog, FPGA, and memory solutions, with headquarters in Chandler, Arizona and global design/support infrastructure.

The AT24Cxx series is Microchip's industry-standard serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in space-constrained and thermally demanding embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01C-PUM?

The AT24C01C-PUM supports three I²C speed modes: Standard mode up to 100 kHz (1.7–5.5V), Fast mode up to 400 kHz (1.7–5.5V), and Fast Mode Plus up to 1 MHz (2.5–5.5V). The 1 MHz capability requires VCC ≥2.5V and is validated per AC Characteristics in DS20006111A. This makes AT24C01C-PUM suitable for high-throughput firmware update scenarios where legacy 100 kHz EEPROMs would bottleneck system responsiveness.

Does the AT24C01C-PUM require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C01C-PUM requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is an input that must be held high when idle. 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 typical values selected based on bus capacitance and rise-time requirements. Failure to install appropriate pull-ups will result in communication failure or intermittent bus lockup.

How does the Write-Protect (WP) pin function on the AT24C01C-PUM?

The WP pin on AT24C01C-PUM is an active-high hardware lock: when tied to VCC, it inhibits all write operations to the entire memory array; when tied to GND, normal read/write access is enabled. If left floating, the internal strong pull-down defaults WP to GND - but Microchip recommends hard-wiring WP to avoid noise-induced glitches. This feature provides deterministic, hardware-enforced protection against firmware corruption during power transients or software faults.

What is the memory organization of the AT24C01C-PUM and how does it affect write operations?

The AT24C01C-PUM organizes its 1-Kbit memory as 128 words of 8 bits each, grouped into 16 pages of 8 bytes. This structure enables 8-byte page writes - allowing up to 8 sequential bytes to be written in a single I²C transaction with ≤5 ms self-timed completion. Partial-page writes are permitted, but crossing page boundaries requires separate write cycles. This architecture balances speed, flexibility, and endurance, making AT24C01C-PUM ideal for storing compact configuration structures without wasting write cycles on padding.

Is the AT24C01C-PUM compatible with standard I²C protocol and what are its address options?

Yes, AT24C01C-PUM is fully compliant with standard I²C protocol (UM10204), supporting START/STOP conditions, ACK/NACK handshaking, and 7-bit addressing. Its base device address is 0b1010xxx, where the three LSBs (xxx) are configured by A0, A1, and A2 pins - enabling up to eight devices on one bus. In PDIP-8 packaging, all three address pins are accessible and must be hard-wired to GND or VCC; floating pins default to logic 0 via internal pull-down, ensuring predictable default addressing.