Microchip Technology 93C76C-E/MS

Overview

93C76C-E/MS from Microchip Technology Inc. is an 8Kbit, 4.5–5.5V serial EEPROM with configurable 8-/16-bit word organization via the ORG pin and hardware write-protection via the PE pin. It features self-timed erase/write cycles (2 ms), 1M endurance, >200-year data retention, and industrial/automotive temperature support (–40°C to +125°C). Used in embedded systems for parameter storage, calibration data, and firmware configuration.

For engineers reviewing the 93C76C-E/MS datasheet, 93C76C-E/MS pinout, 93C76C-E/MS application, or 93C76C-E/MS equivalent, key selection considerations include VCC range compatibility (4.5–5.5V only), ORG/PE pin dependency for memory configuration and write-enable control, Ready/Busy status polling via DO, and MSOP-8 package footprint constraints.

Technical Context

The 93C76C-E/MS implements a Microwire-compatible 3-wire serial interface (CS, CLK, DI/DO) with synchronous read/write operations clocked on CLK rising edges. Its dual-word-size capability is determined solely by the logic level applied to the ORG pin-high for 512×16-bit, low for 1024×8-bit-and requires external pull-up/down for stable configuration.

Write protection is enforced at the hardware level: programming is only enabled when PE = VCC; tying PE to VSS permanently inhibits all erase/write functions. The device enters EWDS mode at power-up and requires explicit EWEN before any programming command, with automatic ERAL preceding WRAL.

Key Specifications

Pinout & Package

8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (not electrically connected per datasheet Note 1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 93LC76C-E/MS, the 93C76C-E/MS trades wider voltage flexibility for stricter 4.5–5.5 V operation - ideal for legacy 5 V systems needing enhanced noise immunity. Versus SPI flash alternatives, it delivers guaranteed 1M-cycle endurance and deterministic 2 ms writes essential for parameter logging, not code storage.

Availability

93C76C-E/MS is available at Aetrix Electronics and suitable for automotive ECU calibration, industrial PLC configuration, and medical device parameter storage requiring stable component supply, long-lifecycle support, and AEC-Q200-aligned reliability.

Supply support for 93C76C-E/MS 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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 93Cxx family was designed specifically for cost-sensitive, low-power embedded systems requiring reliable, pin-configurable serial EEPROM with hardware-level data protection - targeting automotive, industrial, and medical applications demanding extended temperature operation and long-term data integrity.

FAQ

What is the minimum VCC voltage required for reliable operation of the 93C76C-E/MS?

The 93C76C-E/MS requires a minimum VCC of 4.5 V for all operations. Below 4.5 V, internal power-on reset (POR) circuitry disables all functions - including read - to prevent data corruption. The datasheet specifies VPOR at 3.8 V, but functional operation is only guaranteed within the 4.5–5.5 V range. Operating the 93C76C-E/MS outside this window risks undefined behavior or complete non-functionality.

Can the 93C76C-E/MS be used in a 3.3 V system?

No, the 93C76C-E/MS is not compatible with 3.3 V systems. Its absolute VCC specification is 4.5–5.5 V only. Attempting to power the 93C76C-E/MS from 3.3 V will result in failure to initialize, inability to execute commands, and potential communication errors. For 3.3 V designs, consider the functionally identical 93LC76C-E/MS (2.5–5.5 V range) or 93AA76C-E/MS (1.8–5.5 V range), both offered in the same MSOP-8 package.

How does the ORG pin affect memory addressing in the 93C76C-E/MS?

The ORG pin directly determines the memory map: when pulled high (VCC), the 93C76C-E/MS configures as 512 words × 16 bits (x16), using 9-bit addresses; when pulled low (VSS), it configures as 1024 words × 8 bits (x8), using 10-bit addresses. This changes instruction timing (e.g., READ requires 22 vs. 29 clock cycles) and data width - the host MCU must match its data bus width and address generation to the ORG state. The pin must be statically tied; floating causes undefined behavior.

What happens if the PE pin is left unconnected on the 93C76C-E/MS?

The PE pin must never be left floating. Per the datasheet, it must be tied to either VCC (to enable programming) or VSS (to permanently disable all erase/write functions). An unconnected PE pin results in indeterminate logic level, which may intermittently allow or block writes - creating a serious reliability and data integrity risk. Always use a pull-up or pull-down resistor (e.g., 10 kΩ) to ensure a defined state at power-up and during operation.

Is the 93C76C-E/MS pin-compatible with other members of the 93XX76 family in MSOP-8 packaging?

Yes, the 93C76C-E/MS is fully pin-compatible with all 93XX76A/B/C variants offered in the MSOP-8 (MS) package - including 93AA76C-E/MS and 93LC76C-E/MS - sharing identical pin assignments for CS, CLK, DI, DO, VSS, ORG, PE, and VCC. However, functional differences exist: 'A' and 'B' versions lack ORG and PE pins (tied internally), and 'C' versions require those pins for configuration. Swapping requires verifying VCC range, temperature grade, and feature support in the target application.