Microchip Technology AT93C66-10TI-2.7

Overview

AT93C66-10TI-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, 2.7V–5.5V supply range, and automotive-grade industrial temperature operation (−40°C to +85°C). It delivers high reliability with 1 million write cycles and 100-year data retention in an 8-lead TSSOP package.

For engineers reviewing the AT93C66-10TI-2.7 datasheet, AT93C66-10TI-2.7 pinout, AT93C66-10TI-2.7 application, or AT93C66-10TI-2.7 equivalent, key selection considerations include voltage compatibility (2.7V min), self-timed 10 ms write cycle, standby current as low as 6 µA at 2.7V, and support for both x8/x16 memory mapping in space-constrained embedded systems.

Technical Context

The AT93C66-10TI-2.7 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its internal architecture supports dual memory organizations selected by the ORG pin state-ground for x8, VCC for x16-and includes on-chip logic to manage erase/write enable states and Ready/Busy status reporting via DO during programming.

It operates across two voltage families: 2.7V–5.5V (this part) and 1.8V–5.5V (not applicable here). The device uses no external erase cycle; all writes are self-timed with t_WP ≤ 10 ms at 4.5V–5.5V and ≤ 3 ms at 2.7V–5.5V. AC timing parameters-including t_SKH/t_SKL ≥ 250 ns and f_SK up to 2 MHz at 5V-are fully specified over its industrial temperature range.

Key Specifications

Pinout & Package

AT93C66-10TI-2.7 is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 3.0 mm × 4.4 mm body, 0.65 mm pitch, with gull-wing leads. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT93C66-10TI-2.7, the AT93C66A-10TI-2.7 offers identical functionality with improved manufacturability and lifecycle support, while the M95M04-DRMN6TP/K trades pin compatibility for higher density and speed-requiring interface and layout changes.

Availability

AT93C66-10TI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, consumer remote control ID storage, and medical diagnostic device setup requiring stable component supply and long-term obsolescence management.

Supply support for AT93C66-10TI-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 is a global leader in microcontrollers, analog components, and memory solutions, delivering scalable, reliable semiconductor products for industrial, automotive, and consumer markets.

The AT93C66-10TI-2.7 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and cost-sensitive embedded systems requiring persistent configuration storage with proven long-term reliability.

FAQ

What is the maximum clock frequency supported by the AT93C66-10TI-2.7?

The AT93C66-10TI-2.7 supports a maximum SK clock frequency of 2 MHz at VCC = 5.0V. At lower supply voltages (2.7V–5.5V), the maximum clock rate reduces to 1 MHz; at 1.8V–2.7V (not applicable to this variant), it is 0.25 MHz. These values are specified in Table 4 of the datasheet and define the upper limit for reliable serial communication timing.

How does the ORG pin affect memory organization in the AT93C66-10TI-2.7?

The ORG pin on the AT93C66-10TI-2.7 selects between two memory maps: when tied to GND, the device operates as 512 × 8 (512 words × 8 bits); when tied to VCC, it operates as 256 × 16 (256 words × 16 bits). This hardware-selectable configuration eliminates software overhead and allows flexible data structure alignment without changing the AT93C66-10TI-2.7 part number.

Is the AT93C66-10TI-2.7 suitable for automotive applications?

Yes - the AT93C66-10TI-2.7 is explicitly qualified for automotive-grade extended temperature operation (−40°C to +85°C) and offered in lead-free/halogen-free packaging. Its 1 million write cycles and 100-year data retention meet stringent reliability requirements for body electronics, infotainment, and ADAS subsystems where long-term data integrity is critical.

What is the write endurance and data retention specification for the AT93C66-10TI-2.7?

The AT93C66-10TI-2.7 guarantees 1 million write/erase cycles and 100 years of data retention at 25°C. These specifications are validated per JEDEC standards and apply across its full operating temperature range (−40°C to +85°C), making it suitable for applications requiring frequent updates and decades-long deployment without maintenance.

Does the AT93C66-10TI-2.7 require an external erase cycle before writing?

No - the AT93C66-10TI-2.7 performs all erase operations automatically during the WRITE or ERASE instruction execution. There is no separate erase command required prior to writing; the self-timed write cycle (≤10 ms) includes any necessary erase phase internally, simplifying firmware implementation and reducing host-side timing dependencies.