Microchip Technology 24C65-I/P

Overview

24C65-I/P from Microchip Technology Inc. is a 64 Kbit (8K × 8) I²C-compatible serial EEPROM with programmable high-endurance memory blocks, 64-byte input cache, and dual-speed I²C interface (100 kHz at 1.8–4.5 V, 400 kHz at 4.5–6.0 V). It operates across industrial temperature range (–40°C to +85°C), supports up to eight devices on one bus, and features Schmitt-trigger inputs for noise immunity. Used in embedded systems requiring frequent parameter updates - e.g., calibration data storage in industrial sensors.

For engineers reviewing the 24C65-I/P datasheet, 24C65-I/P pinout, 24C65-I/P application, or 24C65-I/P equivalent, key selection criteria include its 4.5–6.0 V supply range, 400 kHz Fast Mode I²C timing compliance, 10 million-cycle high-endurance block, programmable security options, and PDIP-8 package compatibility with legacy through-hole designs.

Technical Context

The 24C65-I/P implements a two-wire I²C slave interface with hardware-addressable device select lines (A0–A2), enabling up to eight devices on a shared bus. Its internal architecture includes a 64-byte FIFO page cache, dual endurance memory mapping (10M cycles for one 4K block, 1M cycles for remaining 60K bits), and configurable write-protection for 0–15 contiguous 4K blocks.

It uses advanced CMOS process with on-chip voltage generator for EEPROM programming, self-timed erase/write cycles, power-on/off data protection, and V_CC monitor circuitry to prevent corruption during brown-out conditions. All I/O pins feature Schmitt-trigger inputs and output slope control to suppress ground bounce and EMI.

Key Specifications

Pinout & Package

24C65-I/P is housed in an 8-pin PDIP package (0.3" body width), suitable for prototyping and legacy PCB layouts requiring through-hole assembly. Pin spacing is 0.1" (2.54 mm), with standard DIP footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24C65-I/P, the 24LC65-I/P extends voltage flexibility at the cost of reduced noise immunity at low V_CC, while the AT24C64D-PU trades advanced programmability for lower unit cost and broader vendor availability - neither offers identical endurance segmentation or security granularity.

Availability

24C65-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration storage, legacy controller configuration, medical device usage logging, and automotive aftermarket tool settings requiring stable component supply, long-term obsolescence support, and RoHS-compliant through-hole packaging.

Supply support for 24C65-I/P 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 manufacturer specializing in microcontrollers, analog devices, and memory products, with emphasis on reliability, longevity, and industrial-grade qualification.

The 24C65-I/P belongs to Microchip's "Smart Serial EEPROM" product line, designed specifically for embedded systems needing robust, field-updatable nonvolatile storage with differentiated endurance and security - targeting industrial automation, medical instrumentation, and automotive diagnostics.

FAQ

What is the maximum I²C clock frequency supported by the 24C65-I/P?

The 24C65-I/P supports I²C Fast Mode at up to 400 kHz, but only when V_CC is maintained within 4.5 V to 6.0 V. It does not support Standard Mode (100 kHz) below 4.5 V - unlike the 24LC65 variant. This makes the 24C65-I/P strictly a 5 V system component, and timing parameters such as T_HIGH (600 ns min) and T_LOW (1300 ns min) must be met at the host controller level for reliable communication.

Does the 24C65-I/P have a high-endurance memory block, and how is it configured?

Yes, the 24C65-I/P includes a programmable 4K-bit high-endurance block rated for 10,000,000 erase/write cycles. Configuration is performed via a dedicated command sequence that sets bit 7 (S/HE) low in the configuration byte and loads the target block address. The default location is the highest memory block (0x1E00–0x1FFF). Once set, the high-endurance block remains active even if overlapping with a security-protected region - and cannot be relocated after security is enabled.

Can the 24C65-I/P be used interchangeably with the 24AA65 or 24LC65 in the same design?

No - the 24C65-I/P is not interchangeable with the 24AA65 or 24LC65 due to incompatible V_CC ranges. The 24C65-I/P requires 4.5–6.0 V, whereas the 24AA65 operates down to 1.8 V and the 24LC65 starts at 2.5 V. Substituting them risks functional failure or excessive current draw. Additionally, the 24C65-I/P lacks 100 kHz support below 4.5 V, limiting its use in mixed-voltage or battery-powered systems where the other variants excel.

What package type and pinout does the 24C65-I/P use?

The 24C65-I/P uses an 8-pin PDIP (Plastic Dual In-line Package) with 0.3" body width and 0.1" pin pitch. Its pinout is standardized: Pins 1–4 are A0, A1, A2, VSS; Pins 5–8 are VCC, NC, SCL, SDA. The NC (No Connect) pin is internally unconnected and must remain floating - no tie-high, tie-low, or bypass capacitor is permitted. This matches industry-standard 24Cxx EEPROM footprints.

How does the 64-byte page cache improve write performance in the 24C65-I/P?

The 64-byte input cache in the 24C65-I/P allows the host to stream up to 64 bytes of data over I²C before triggering the internal write cycle. This decouples bus transfer time from EEPROM programming latency - enabling full-speed I²C bursts (up to 400 kHz) followed by a single 5 ms/page write. For example, writing 64 bytes takes ~1.6 ms on the bus plus 5 ms of internal write time, versus 8 × (bus + 5 ms) without caching - reducing total write latency by >85%.