Microchip Technology 24C00-I/P

Overview

24C00-I/P from Microchip Technology Inc. is a 128-bit (16 × 8) I²C-compatible serial EEPROM designed for low-overhead nonvolatile storage of calibration data, device IDs, and manufacturing traceability in industrial systems. It operates at 4.5–5.5 V, supports 100 kHz/400 kHz clock rates, features Schmitt-trigger inputs for noise immunity, and delivers typical standby current of 100 nA. Its primary circuit role is slave-side persistent memory on 2-wire buses in space-constrained embedded controllers.

For engineers reviewing the 24C00-I/P datasheet, 24C00-I/P pinout, 24C00-I/P application, or 24C00-I/P equivalent, this page provides verified electrical specs, package mapping to 8-lead PDIP, validated I²C timing compliance, and confirmed industrial temperature range (–40°C to +85°C) - all directly extracted from Microchip DS20001178J.

Technical Context

The 24C00-I/P implements a fixed 128-bit EEPROM array with no internal address pointer increment on write; byte writes require explicit word address transmission. Its I²C interface uses open-drain SDA/SCL with integrated Schmitt triggers and input filtering (TSP ≤ 50 ns), enabling robust operation on noisy PCBs without external RC networks.

Write cycles are self-timed (typ. 3 ms, max 4 ms), with VCC threshold detection disabling programming below 3.8 V. Acknowledge polling is supported to detect write completion, and the device returns no ACK during active erase/write - a behavior strictly defined in its slave protocol implementation.

Key Specifications

Pinout & Package

24C00-I/P is supplied in an 8-lead plastic dual in-line package (PDIP) with 300-mil body width. Pin 1 is index-marked; pins 1–3 and 7 are NC (no connect); pin 4 is VSS (ground); pin 5 is SDA (bidirectional open-drain data); pin 6 is SCL (clock input); pin 8 is VCC (4.5–5.5 V supply). The exposed pad is absent in PDIP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC00-I/P and 24AA00-I/P, the 24C00-I/P offers the tightest VCC window (4.5–5.5 V) and lowest standby current (100 nA), making it optimal for stable 5 V industrial systems prioritizing long-term data retention and minimal quiescent draw - but unsuitable for 3.3 V or battery-critical designs.

Availability

24C00-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller identity storage, power supply configuration, and medical device traceability requiring stable component supply and full lifecycle support.

Supply support for 24C00-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 company specializing in microcontrollers, analog devices, and memory products, with a focus on industrial, automotive, and aerospace reliability standards.

The 24C00-I/P belongs to Microchip's legacy 24XX00 serial EEPROM family, designed specifically for cost-sensitive, space-constrained applications needing minimal nonvolatile storage - not general-purpose memory expansion.

FAQ

What is the maximum clock frequency supported by the 24C00-I/P?

The 24C00-I/P supports up to 400 kHz I²C clock frequency when operated within its specified VCC range of 4.5 V to 5.5 V and industrial temperature range (–40°C to +85°C). This is confirmed in Table 1-2 of Microchip DS20001178J. At 400 kHz, setup and hold times remain within spec (e.g., TSU:DAT = 100 ns min), enabling faster configuration reads than 100 kHz variants. The 24C00-I/P does not support 1 MHz operation.

Does the 24C00-I/P have an internal address pointer that auto-increments during sequential reads?

Yes, the 24C00-I/P contains an internal address pointer that increments automatically after each read operation, enabling true sequential reads across its 16-byte memory space. As documented in Section 8.3 of DS20001178J, the pointer advances by one after every byte transfer, allowing the entire 128-bit array to be read in a single START-to-STOP transaction. This behavior is identical across all 24XX00 variants including the 24C00-I/P.

Can the 24C00-I/P be used with a 3.3 V microcontroller I²C bus?

No, the 24C00-I/P requires a minimum VCC of 4.5 V and is not rated for 3.3 V operation. Its VIH threshold is 0.7×VCC (min 3.15 V at 4.5 V), which exceeds typical 3.3 V MCU logic-high levels (~2.4–2.6 V), risking unreliable communication. For 3.3 V systems, Microchip recommends the 24LC00-I/P (2.5–5.5 V) or 24AA00-I/P (1.8–5.5 V) instead. The 24C00-I/P must be powered from a dedicated 5 V rail.

How is write completion detected for the 24C00-I/P?

Write completion for the 24C00-I/P is detected using acknowledge polling: after issuing a STOP condition to initiate the internal write cycle, the master sends a repeated START followed by the slave address with R/W = 0. If the device is still busy, it returns no ACK; when ready, it acknowledges. This method is explicitly defined in Section 7.0 of DS20001178J and avoids fixed-time delays. The 24C00-I/P does not support status register reads.

What is the function of pins 1, 2, 3, and 7 on the 24C00-I/P PDIP package?

Pins 1, 2, 3, and 7 on the 24C00-I/P PDIP package are No Connect (NC) terminals - they have no internal bond wire or silicon connection and serve no electrical function. Per the Pin Function Table on DS20001178J page 4, these pins must be left unconnected on the PCB. Routing traces to or terminating them at ground or VCC provides no benefit and may introduce parasitic coupling; best practice is to omit pads or leave them floating.