Microchip Technology AT93C56W-10SI-2.7

Overview

AT93C56W-10SI-2.7 from Microchip Technology (formerly Atmel) is a 2-kbit serial EEPROM with three-wire interface, user-selectable 256 × 8 or 128 × 16 organization, 2.7V to 5.5V supply range, and automotive-grade temperature support (−40°C to +85°C). It delivers 1 million write cycles and 100-year data retention in an 8-lead EIAJ SOIC package, used for configuration storage in industrial control modules.

For engineers reviewing the AT93C56W-10SI-2.7 datasheet, AT93C56W-10SI-2.7 pinout, AT93C56W-10SI-2.7 application, or AT93C56W-10SI-2.7 equivalent, this page provides verified electrical specs, functional timing behavior, package dimensions, real-world use cases, and validated alternative parts for design-in and sourcing decisions.

Technical Context

The AT93C56W-10SI-2.7 implements a synchronous three-wire serial protocol with Chip Select (CS), Serial Clock (SK), and bidirectional Data I/O (DI/DO), supporting READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL instructions. Its ORG pin selects between x8 and x16 memory mapping, and internal logic enforces Erase/Write Enable state before programming.

It features self-timed write cycles (max 10 ms at 5V), Ready/Busy status reporting via DO during CS high, and no separate erase step required before write. DC and AC characteristics are fully specified across 1.8V–5.5V operation, with distinct timing limits for 2.7V and 1.8V versions - the -2.7 suffix confirms 2.7V–5.5V operation.

Key Specifications

Pinout & Package

AT93C56W-10SI-2.7 uses an 8-lead EIAJ SOIC package (8S2), 0.209" body width, with gull-wing leads and standard JEDEC-compatible footprint. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT93C56W-10SI-2.7, M95256-WDW6TP offers 100× more capacity and SPI speed but demands layout changes and driver updates, while AT25256A-SSHL-T matches SOIC-8 mechanical fit but requires firmware adaptation for SPI protocol and leverages hardware write protection for safety-critical updates.

Availability

AT93C56W-10SI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical calibration modules, and smart metering applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AT93C56W-10SI-2.7 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 acquired Atmel in 2016 and maintains full support for legacy Atmel EEPROMs, including documentation, quality assurance, and long-term manufacturing commitments.

The AT93C56W-10SI-2.7 belongs to Microchip's legacy serial EEPROM family designed for cost-sensitive, low-pin-count applications where three-wire simplicity, wide voltage operation, and automotive reliability are prioritized over high-speed or high-density requirements.

FAQ

What is the maximum clock frequency supported by AT93C56W-10SI-2.7?

The AT93C56W-10SI-2.7 supports up to 2 MHz SK clock frequency at VCC = 4.5V–5.5V, 1 MHz at 2.7V–5.5V, and 0.25 MHz at 1.8V–5.5V. These values are specified in Table 4 of the datasheet and reflect guaranteed timing margins across temperature and voltage - the -2.7 suffix confirms the 2.7V–5.5V operating range applies to this specific AT93C56W-10SI-2.7 unit.

How does the ORG pin affect memory organization in AT93C56W-10SI-2.7?

In AT93C56W-10SI-2.7, the ORG pin selects between 256 × 8-bit (ORG = GND) and 128 × 16-bit (ORG = VCC) configurations. When left floating, the internal 1 MΩ pull-up sets x16 mode - but this behavior is not guaranteed on 1.8V variants. The AT93C56W-10SI-2.7 datasheet explicitly confirms ORG functionality for its 2.7V version, making it a reliable hardware-configurable feature.

Is AT93C56W-10SI-2.7 pin-compatible with AT93C56A series devices?

No - AT93C56W-10SI-2.7 is not pin-compatible with AT93C56A. The AT93C56A is a revised version with improved reliability and updated AC timing, but uses identical pinout and package. However, the "W" suffix denotes EIAJ SOIC (8S2), while many AT93C56A variants use JEDEC SOIC (8S1); mechanical compatibility requires verifying land pattern dimensions per drawing 8S1 vs. 8S2 before substitution.

What is the write endurance and data retention specification for AT93C56W-10SI-2.7?

AT93C56W-10SI-2.7 is rated for 1 million write/erase cycles and 100 years of data retention at 25°C, per Table 4 and Features section. These values are measured under standard conditions (5.0V, 25°C) and represent minimum guaranteed performance - actual field lifetime may exceed specifications depending on operating voltage, temperature, and usage profile.

Does AT93C56W-10SI-2.7 require a separate erase command before writing?

No - AT93C56W-10SI-2.7 does not require a prior erase command before writing. Each WRITE instruction automatically erases and programs the target location in a single self-timed operation. The ERASE instruction is optional and only used when selective location erasure is needed without immediate write, such as preparing for future updates. This simplifies firmware implementation for the AT93C56W-10SI-2.7.