Microchip Technology AT93C57W-10SI-2.7

Overview

AT93C57W-10SI-2.7 from Microchip Technology (formerly Atmel) is a 2K-bit serial EEPROM with 3-wire interface, supporting 256 × 8 or 128 × 16 organization selectable via ORG pin, 2.7V–5.5V supply range, 10 ms max self-timed write cycle, and industrial temperature operation (−40°C to +85°C). It is used in embedded system configuration storage, sensor calibration data retention, and power-management parameter backup.

For engineers reviewing the AT93C57W-10SI-2.7 datasheet, AT93C57W-10SI-2.7 pinout, AT93C57W-10SI-2.7 application, or AT93C57W-10SI-2.7 equivalent, key selection criteria include low-voltage operation down to 2.7V, SOIC-8 (EIAJ) package compatibility, 2 MHz clock support at 5V, 1 million write endurance, and READY/BUSY status reporting via DO pin during write cycles.

Technical Context

The AT93C57W-10SI-2.7 implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Memory organization is dynamically selected by ORG pin voltage: VCC selects 128 × 16 mode; GND selects 256 × 8 mode.

It features self-timed write/erase cycles with no external erase step required, READY/BUSY status feedback via DO pin when CS is asserted post-instruction, and internal pull-up on ORG pin (not active in 1.8V variants). The device operates across −40°C to +85°C and supports 1.8V–5.5V supply ranges depending on variant - this part is specifically rated for 2.7V–5.5V operation.

Key Specifications

Pinout & Package

AT93C57W-10SI-2.7 is housed in an 8-lead EIAJ SOIC (package code 8S2), 0.200" wide, with standard gull-wing lead form and 1.27 mm pitch. Pin 1 is marked by notch or bevel; device orientation follows JEDEC MO-041AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95256-WMN6TP and STK12C68-5LH1T, the AT93C57W-10SI-2.7 provides minimal-footprint, low-power, pin-compatible drop-in replacement within the AT93Cxx family - ideal for legacy 3-wire designs requiring industrial temp grade and proven 1M-cycle endurance without interface overhaul.

Availability

AT93C57W-10SI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power management unit settings requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for AT93C57W-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 continues to manufacture, qualify, and support the AT93Cxx EEPROM family under its broad serial memory portfolio.

The AT93C57 belongs to Microchip's legacy 3-wire serial EEPROM product line, designed for cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with minimal I/O count and low-voltage operation.

FAQ

What is the memory organization of the AT93C57W-10SI-2.7?

The AT93C57W-10SI-2.7 offers user-selectable organization: 256 × 8 bits when ORG is grounded, or 128 × 16 bits when ORG is tied to VCC. An internal ~1 MΩ pull-up selects x16 mode if ORG is left floating. This configuration is fixed at power-on and remains static during operation. The AT93C57W-10SI-2.7 does not support dynamic reconfiguration mid-operation.

Does the AT93C57W-10SI-2.7 support 1.8V operation?

No, the AT93C57W-10SI-2.7 is rated for 2.7V to 5.5V operation only. While the broader AT93Cxx family includes 1.8V variants (e.g., suffix -1.8), this specific part number uses the -2.7 option and is not characterized or guaranteed below 2.7V. Attempting 1.8V operation may result in unreliable reads, failed writes, or undefined behavior.

How is READY/BUSY status reported on the AT93C57W-10SI-2.7?

The AT93C57W-10SI-2.7 reports READY/BUSY status on the DO pin: after initiating a WRITE or ERASE command, assert CS high for ≥250 ns to sample DO - a logic '1' indicates completion, '0' indicates ongoing operation. This status is valid only while CS remains high post-command and before the next instruction begins. The AT93C57W-10SI-2.7 does not support interrupt-driven status signaling.

What package type does the AT93C57W-10SI-2.7 use?

The AT93C57W-10SI-2.7 uses an 8-lead EIAJ SOIC package (package code 8S2), 0.200" wide, with gull-wing leads and 1.27 mm pitch. It is distinct from JEDEC SOIC (8S1) due to wider body and different leadform - PCB footprints are not interchangeable. The 'W' in the part number explicitly denotes EIAJ SOIC packaging.

Can the AT93C57W-10SI-2.7 be used as a direct replacement for AT93C56W-10SI-2.7?

No - although both share identical package, voltage range, and pinout, the AT93C57W-10SI-2.7 provides 2K-bit capacity (256 × 8 / 128 × 16) versus 2K-bit for AT93C56W-10SI-2.7, but their instruction sets differ in address length: AT93C57 uses 8-bit addressing (A7–A0) while AT93C56 uses 9-bit (A8–A0). Firmware must be updated to match the correct address width; it is not a drop-in replacement.