Microchip Technology 24AA512T-I/CS17K

Overview

24AA512T-I/CS17K from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 400 µA max read current, and hardware write-protection via WP pin. It supports cascaded bus configurations up to eight devices and is used in embedded systems for firmware storage, calibration data retention, and configuration parameter backup.

For engineers reviewing the 24AA512T-I/CS17K datasheet, 24AA512T-I/CS17K pinout, 24AA512T-I/CS17K application, or 24AA512T-I/CS17K equivalent, key selection criteria include VCC min (1.7V), page write buffer size (128 bytes), clock frequency support (up to 400 kHz), endurance (1 million cycles), and package-specific pin compatibility with SOIC-8 or TSSOP-8 footprints.

Technical Context

The 24AA512T-I/CS17K implements a two-wire I²C interface with Schmitt-trigger inputs on SDA/SCL for noise immunity and slope-controlled outputs to suppress ground bounce. Its internal address counter enables sequential reads across the full 512 Kbit memory space without wraparound limitation within a single device.

Write operations use a self-timed erase/write cycle with 5 ms maximum page write time and automatic address incrementing. The WP pin provides hardware-level write protection for the entire memory array when tied to VCC, and the device supports acknowledge polling to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

24AA512T-I/CS17K is supplied in an 8-lead SOIC package (3.9 mm width), with lead finish matte tin and JEDEC-standard pinout. Pin 1 is A0 (chip address), pin 4 is VSS (ground), pin 5 is SDA (bidirectional open-drain I/O), pin 6 is SCL (clock input), pin 7 is WP (write-protect), and pin 8 is VCC (power supply).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-I/P and AT24C512BN-SH-T, the 24AA512T-I/CS17K uniquely supports 1.7V operation while maintaining identical industrial temperature rating and SOIC-8 footprint - making it the only drop-in solution for ultra-low-voltage embedded systems requiring guaranteed 512 Kbit nonvolatile storage.

Availability

24AA512T-I/CS17K is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and automotive body control module applications requiring stable component supply across extended production lifecycles.

Supply support for 24AA512T-I/CS17K 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 leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA512T-I/CS17K belongs to Microchip's 24XX512 family of I²C serial EEPROMs, engineered for robust nonvolatile data storage in industrial, automotive, and consumer applications where low-power operation and high reliability are mandatory.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA512T-I/CS17K?

The 24AA512T-I/CS17K supports operation down to 1.7V VCC across its full industrial temperature range (–40°C to +85°C). Below 2.5V, maximum I²C clock frequency is limited to 100 kHz per datasheet DS20001754Q, ensuring compatibility with ultra-low-power microcontrollers and energy-harvesting systems. This 1.7V threshold is verified across production lots and is not a typical-only specification.

How does the WP pin function on the 24AA512T-I/CS17K, and what happens if it is left floating?

The WP pin on the 24AA512T-I/CS17K must be actively driven to either VSS (enable writes) or VCC (disable writes); it is not internally biased. If left floating, the device enters an undefined state where write operations may intermittently succeed or fail due to noise coupling, violating data integrity requirements. Microchip specifies hard-wiring WP to VSS or VCC in all production designs to ensure deterministic behavior.

Can the 24AA512T-I/CS17K perform sequential reads across the entire 64K address space without interruption?

Yes, the 24AA512T-I/CS17K supports uninterrupted sequential reads across the full 64K × 8-bit memory space. Its internal address counter automatically increments after each byte and rolls over from address FFFFh to 0000h upon reaching the end, enabling continuous streaming of configuration data or firmware segments without host-side address management.

What is the maximum number of 24AA512T-I/CS17K devices that can share a single I²C bus, and how is addressing managed?

Up to eight 24AA512T-I/CS17K devices can share one I²C bus using the A0, A1, and A2 address pins. Each pin is hardwired to VSS or VCC to configure a unique 3-bit chip address, combining with the fixed 4-bit control code (1010b) to form a 7-bit client address. This allows contiguous 4 Mbit expansion when multiple devices are cascaded in system-level memory maps.

Does the 24AA512T-I/CS17K require external components for I²C bus termination, and what are the recommended pull-up values?

Yes, the 24AA512T-I/CS17K requires external pull-up resistors on both SDA and SCL lines due to its open-drain outputs. Microchip recommends 10 kΩ for 100 kHz operation, 2 kΩ for 400 kHz, and 1 kΩ for 1 MHz (though 24AA512T-I/CS17K is rated for 400 kHz max). These values ensure rise times meet AC specifications while minimizing power consumption in standby mode.