Microchip Technology AT93C57-10PC-2.7

Overview

AT93C57-10PC-2.7 from Microchip Technology (formerly Atmel) is a 2K-bit 3-wire serial EEPROM with user-selectable 256 × 8 or 128 × 16 organization, low-voltage operation (2.7V–5.5V), 10 ms max self-timed write cycle, and 1 million write endurance. It serves as nonvolatile configuration storage in embedded controllers, power management units, and industrial sensor modules requiring reliable data retention over 100 years.

For engineers reviewing the AT93C57-10PC-2.7 datasheet, AT93C57-10PC-2.7 pinout, AT93C57-10PC-2.7 application, or AT93C57-10PC-2.7 equivalent, key selection criteria include voltage compatibility (2.7V min), 3-wire interface timing at 1 MHz (VCC = 2.7V), ORG-pin configurable memory width, and PDIP-8 packaging for through-hole prototyping and legacy industrial PCBs.

Technical Context

The AT93C57-10PC-2.7 implements a synchronous 3-wire serial interface (CS/SK/DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, and EWDS. Its internal logic decodes 7-bit addresses (A7–A0) for x8 mode or 6-bit addresses (A6–A0) for x16 mode based on ORG pin state.

Write operations require explicit Erase/Write Enable (EWEN) before programming; status feedback is provided via DO pin during CS high after tCS ≥ 250 ns. The device supports READY/BUSY polling and does not require separate erase cycles prior to write.

Key Specifications

Pinout & Package

AT93C57-10PC-2.7 uses an 8-pin PDIP (0.300" wide, JEDEC MS-001 BA) package with through-hole mounting. Pin 1 is marked by notch or dot; pinout follows standard orientation with CS on pin 1, SK on pin 2, DI on pin 3, DO on pin 4, VCC on pin 8, GND on pin 5, ORG on pin 7, and DC (no connect) on pin 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95256-WMN6TP and STK12C68-55I, the AT93C57-10PC-2.7 offers proven 3-wire simplicity, PDIP-8 through-hole compatibility for maintenance, and guaranteed 2.7V operation - making it optimal for cost-sensitive, low-pin-count industrial upgrades where protocol and package stability are critical.

Availability

AT93C57-10PC-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and power management unit settings requiring stable component supply across extended product lifecycles.

Supply support for AT93C57-10PC-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 the legacy AT93C family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.

The AT93C57 belongs to Microchip's serial EEPROM product line, designed specifically for low-power, low-pin-count nonvolatile storage in resource-constrained embedded systems where reliability and long-term data integrity are essential.

FAQ

What is the memory organization of AT93C57-10PC-2.7?

The AT93C57-10PC-2.7 supports two configurations: 256 words × 8 bits or 128 words × 16 bits, selected by the logic level on the ORG pin. When ORG is tied to VCC, the 128 × 16 mode is active; when grounded, it operates in 256 × 8 mode. This flexibility allows the same AT93C57-10PC-2.7 device to adapt to varying data-width requirements without changing firmware or hardware design.

Does AT93C57-10PC-2.7 require a separate erase cycle before writing?

No, the AT93C57-10PC-2.7 performs automatic on-the-fly erase during the write cycle - no pre-erase step is needed. Each WRITE instruction internally erases and reprograms the target location. However, an Erase/Write Enable (EWEN) instruction must be issued first to unlock programming capability, and the part remains enabled until EWDS is sent or power is cycled.

Can AT93C57-10PC-2.7 operate reliably at 2.7V?

Yes, AT93C57-10PC-2.7 is explicitly rated for 2.7V to 5.5V operation. At VCC = 2.7V, its maximum clock frequency is 1 MHz, tCS minimum is 500 ns, and standby current is ≤10 µA. These parameters are fully characterized and guaranteed across the commercial temperature range (0°C to +70°C), ensuring robust functionality in low-voltage embedded systems.

What package type does AT93C57-10PC-2.7 use?

AT93C57-10PC-2.7 uses an 8-pin PDIP (Plastic Dual Inline Package) with 0.300" body width, compliant with JEDEC MS-001 BA standard. Pin 1 is identified by a notch or dot; the package is through-hole mountable and compatible with standard wave-soldering processes used in industrial PCB assembly.

How is write protection implemented in AT93C57-10PC-2.7?

Write protection in AT93C57-10PC-2.7 is enforced by default at power-up: the device enters Erase/Write Disable (EWDS) state, blocking all programming instructions. To enable writes, the host must issue an Erase/Write Enable (EWEN) command. Protection is reasserted by sending EWDS or removing VCC - preventing accidental overwrites during noise events or brown-out conditions.