Microchip Technology AT93C86-10PI-2.7

Overview

AT93C86-10PI-2.7 from Atmel is a 16-kbit serial EEPROM organized as either 2048 × 8 or 1024 × 16 bits, selectable via the ORG pin, operating from 2.7V to 5.5V with a 3-wire SPI-compatible interface (CS/SK/DI/DO), Schmitt-trigger inputs for noise immunity, and self-timed write cycles up to 10 ms - used in automotive instrument clusters for calibration data storage.

For engineers reviewing the AT93C86-10PI-2.7 datasheet, AT93C86-10PI-2.7 pinout, AT93C86-10PI-2.7 application, or AT93C86-10PI-2.7 equivalent, key selection factors include voltage range compatibility (2.7–5.5 V), organization flexibility (x8/x16), industrial temperature support (−40°C to +85°C), PDIP package footprint, and READY/BUSY status reporting via DO pin during write/erase operations.

Technical Context

The AT93C86-10PI-2.7 implements a synchronous 3-wire serial interface with chip-select–gated access, supporting seven instruction types (READ, WRITE, ERASE, EWEN, EWDS, ERAL, WRAL) decoded from start bit + opcode + address/data. Memory organization is dynamically selected by ORG pin logic level at power-up.

It features internal clock generation synchronized to SK, status feedback via DO pin (READY/BUSY) when CS is raised mid-cycle, and no external erase step required before write - all operations are self-timed with tWP ≤ 10 ms at 4.5–5.5 V and ≤ 4 ms at 2.7–5.5 V.

Key Specifications

Pinout & Package

AT93C86-10PI-2.7 is supplied in an 8-lead PDIP (0.300" wide, JEDEC MS-001 BA) package with 0.100" lead pitch. Pin 1 is marked by notch or dot; pin numbering follows standard counter-clockwise convention from top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M95128-WMN6TP and STK13C68-J10F, the AT93C86-10PI-2.7 uniquely combines dual organization (x8/x16), 2.7 V operation, READY/BUSY signaling, and 1M endurance - making it optimal for resource-constrained industrial and automotive systems needing flexible, robust, low-voltage configuration storage.

Availability

AT93C86-10PI-2.7 is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole packaging.

Supply support for AT93C86-10PI-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

Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs for embedded systems.

The AT93Cxx series was designed specifically for cost-sensitive, low-power serial EEPROM applications in automotive, industrial, and consumer electronics - emphasizing voltage flexibility, noise immunity, and long-term data integrity.

FAQ

What is the operating voltage range of the AT93C86-10PI-2.7?

The AT93C86-10PI-2.7 operates from 2.7 V to 5.5 V, enabling direct use in both 3.3 V and 5 V systems without level translation. This dual-voltage capability is confirmed in the DC Characteristics table (VCC1 min = 2.7 V, max = 5.5 V) and explicitly stated in the Features section as "Low-voltage and Standard-voltage Operation – 2.7 (VCC = 2.7V to 5.5V)." The AT93C86-10PI-2.7 maintains full functionality-including 2 MHz clock rate at 5 V and 1 MHz at 2.7 V-across this entire range.

How does the ORG pin affect memory organization in the AT93C86-10PI-2.7?

The ORG pin on the AT93C86-10PI-2.7 selects between two memory configurations: logic high (VCC) enables 1024 × 16-bit organization, while logic low (GND) enables 2048 × 8-bit organization. If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This hardware-selectable structure eliminates software overhead for data-width adaptation and is documented in the Description, Pin Configurations, and Functional Description sections of the datasheet.

Does the AT93C86-10PI-2.7 support READY/BUSY status reporting during write operations?

Yes, the AT93C86-10PI-2.7 provides READY/BUSY status via the DO pin: when CS is brought high after initiating a WRITE or ERASE cycle (and held low for ≥250 ns), DO outputs logic '0' during programming/erasing and logic '1' upon completion. This feature is explicitly described in the Functional Description and illustrated in the WRITE and ERASE Timing diagrams - enabling efficient host polling without fixed delays.

What is the maximum clock frequency supported by the AT93C86-10PI-2.7 at 3.3 V?

At 3.3 V, the AT93C86-10PI-2.7 supports a maximum SK clock frequency of 1 MHz, as specified in the AC Characteristics table under "fSK" for the 2.7V ≤ VCC ≤ 5.5V condition. This is lower than its 2 MHz rating at 4.5–5.5 V but ensures robust timing margins and noise immunity in typical 3.3 V embedded systems. The AT93C86-10PI-2.7 maintains full instruction set compatibility and timing compliance across this range.

Is the AT93C86-10PI-2.7 qualified for automotive applications?

Yes, the AT93C86-10PI-2.7 is explicitly designated as "Automotive Grade" in the Features section and supports extended temperature operation from −40°C to +85°C (industrial grade), matching AEC-Q100 stress test requirements for non-processor automotive components. Its PDIP package (8P3), Schmitt-trigger inputs, and 100-year data retention further validate suitability for instrument clusters, body control modules, and other under-dash applications.