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Microchip Technology AT93C66-10PC-2.7
- Part No.:
- AT93C66-10PC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66-10PC-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,926
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Product details
Overview
AT93C66-10PC-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, supporting 512 × 8 or 256 × 16 organization selectable via ORG pin, operating at 2.7V–5.5V supply, and featuring 10 ms max self-timed write cycle - used for configuration storage in industrial controllers, embedded BIOS, and sensor calibration data retention.
For engineers reviewing the AT93C66-10PC-2.7 datasheet, AT93C66-10PC-2.7 pinout, AT93C66-10PC-2.7 application, or AT93C66-10PC-2.7 equivalent, this page delivers verified electrical specs, package mapping, functional timing behavior, and real-world use context for low-voltage serial memory selection.
Technical Context
The AT93C66-10PC-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. It uses an internal ORG pin to configure memory as either 512 words × 8 bits or 256 words × 16 bits - no external address lines required.
Write operations are self-timed (tWP ≤ 10 ms), require prior EWEN enable, and support READY/BUSY status polling via DO pin when CS is asserted post-command. It guarantees 1 million write cycles and 100-year data retention under specified voltage and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 organization) |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level shifting |
| Max Clock Frequency | 1 MHz at 2.7V - sets maximum serial data throughput for configuration reads/writes |
| Write Cycle Time | ≤10 ms - defines minimum time between successive write commands; blocks further access until complete |
| Endurance | 1,000,000 write cycles - supports frequent field updates in calibration or logging applications |
| Data Retention | 100 years at 25°C - ensures long-term reliability of stored settings across product lifecycle |
| ESD Protection | >4000V HBM - provides robust handling margin during board assembly and field service |
Pinout & Package
AT93C66-10PC-2.7 is housed in an 8-pin PDIP (0.300" wide, JEDEC MS-001 BA compliant) with standard through-hole mounting. Pin 1 is marked by notch or dot; package height ≤ 5.33 mm, body width 7.62 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be low for SK/DI sampling and DO output; high disables interface and places DO in high-impedance state |
| SK | Serial Clock | Synchronous edge-triggered input: rising edge latches DI; falling edge clocks DO - determines bit rate and timing alignment |
| DI | Data Input | Serial command/data input: accepts start bit, op-code, address, and write data; sampled on SK rising edge |
| DO | Data Output | Serial data output: returns read data or READY/BUSY status (logic '1' = ready, '0' = busy) - tri-stated when CS high |
| VCC | Power Supply | Primary supply rail: powers internal logic and memory array; decoupling capacitor required per layout guidelines |
| GND | Ground | Reference return path for all signals and internal circuitry - must be low-impedance connection |
| ORG | Organization Select | Configures memory map: tied to VCC → 256 × 16; tied to GND → 512 × 8; unconnected → defaults to x16 via internal ~1 MΩ pull-up |
| DC | Don't Connect | No internal connection - must remain floating or grounded per design; not usable as I/O or bias node |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout via ORG pin - eliminates need for software address remapping |
| Low-voltage operation | Functional down to 2.7V - supports battery-backed or energy-harvesting systems without voltage boosters |
| Self-timed write cycle | No external timing control needed; tWP ≤ 10 ms guarantees completion before next command - simplifies host firmware |
| Write protection architecture | EWEN/EWDS instruction gating prevents accidental writes - critical for field-deployed device configuration integrity |
| Industrial temperature range | -40°C to +85°C operation - validated for use in motor drives, PLCs, and outdoor instrumentation |
Applications
| Industrial PLC Configuration Storage | Embedded System Bootloader Parameters |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning constants, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during power-up and runtime reconfiguration via SPI-compatible 3-wire bus. Use Value: Enables field-upgradable control logic without firmware reflashing; retains settings across brownouts and maintenance cycles. |
Use Scenario: Holding boot mode flags, UART baud rate presets, and hardware revision identifiers in medical diagnostic equipment. IC Role / Device Role / Timing Role: Early-boot configuration source read by MCU before initializing peripherals or loading application code. Use Value: Reduces boot latency versus flash-based alternatives; supports secure parameter lockdown via EWDS after initialization. |
| Sensor Calibration Data Retention | Consumer Appliance User Settings |
Use Scenario: Saving factory-calibrated offset/gain coefficients for temperature, pressure, and current sensors in HVAC control units. IC Role / Device Role / Timing Role: Persistent calibration store updated only during manufacturing test or field recalibration events. Use Value: Maintains measurement accuracy over 10+ year product life; withstands 1M write cycles required for periodic recalibration. |
Use Scenario: Preserving user-selected display brightness, language preference, and timer defaults in smart kitchen appliances. IC Role / Device Role / Timing Role: Low-power configuration memory accessed infrequently but requiring instant recall on wake-up from standby. Use Value: Achieves sub-1 µA standby current at 2.7V - extends battery life in cordless or backup-powered devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M02-DRMN6TP/K | 2-Mbit SPI interface (4-wire), 1.8V–5.5V, 5ms write cycle, built-in write protection registers | Higher density and faster interface but requires additional CS/SO/SI pins - unsuitable for strict 3-wire pin count constraints | Select when migrating to SPI-based platforms or needing >4 kbit capacity; verify PCB routing for extra signal lines |
| STK12C68-55I | NVSRAM with 8K × 8 organization, parallel interface, 55 ns access, battery-backed operation | Byte-level random access and nanosecond read timing - targets high-speed data logging, not serial configuration storage | Choose only if system demands zero-write-delay reads or concurrent read/write capability; incompatible pinout and protocol |
Compared with M95M02-DRMN6TP/K and STK12C68-55I, the AT93C66-10PC-2.7 offers minimal pin count (3-wire), deterministic 10 ms write latency, and proven compatibility with legacy microcontroller GPIO bit-banged interfaces - making it optimal for cost-sensitive, space-constrained embedded designs.
Availability
AT93C66-10PC-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, embedded bootloader systems, sensor calibration modules, and consumer appliance control boards requiring stable component supply across extended production lifecycles.
Supply support for AT93C66-10PC-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 technical and manufacturing continuity for the AT93C family of serial EEPROMs.
The AT93C66 belongs to Microchip's legacy serial EEPROM product line designed specifically for low-pin-count, low-power configuration storage in resource-constrained embedded systems.
FAQ
What is the memory organization of AT93C66-10PC-2.7 and how is it selected?
The AT93C66-10PC-2.7 provides 4096 bits organized as either 512 × 8 or 256 × 16, selected by the ORG pin: connect ORG to VCC for 256 × 16 mode, to GND for 512 × 8 mode. If left unconnected, an internal ~1 MΩ pull-up selects x16 mode. This hardware-selectable configuration avoids firmware overhead and ensures deterministic addressing at power-on.
Does AT93C66-10PC-2.7 support true 3-wire SPI communication?
The AT93C66-10PC-2.7 uses a proprietary 3-wire serial interface (CS/SK/DI/DO) that is functionally compatible with SPI bit-banging but not electrically SPI-standard: DO is not shared with DI (no bidirectional data line), and clock polarity/phase is fixed. It does not support standard SPI modes (CPOL/CPHA), requiring dedicated GPIO-driven software control rather than hardware SPI peripheral use.
What is the guaranteed write endurance and data retention for AT93C66-10PC-2.7?
The AT93C66-10PC-2.7 is rated for 1,000,000 write cycles and 100 years of data retention at 25°C. These values are production-tested specifications - not typical or estimated figures - and apply across the full 2.7V–5.5V supply range and -40°C to +85°C operating temperature range per datasheet characterization.
Can AT93C66-10PC-2.7 operate reliably at 2.7V supply?
Yes, AT93C66-10PC-2.7 is explicitly characterized and qualified for 2.7V–5.5V operation. At 2.7V, it supports up to 1 MHz clock frequency, maintains full read/write functionality, and meets all AC/DC specifications including tWP ≤ 10 ms and ISB ≤ 10 µA. The "-2.7" suffix in the part number denotes this low-voltage qualification.
How is write protection implemented in AT93C66-10PC-2.7?
AT93C66-10PC-2.7 uses instruction-based write protection: programming instructions (WRITE, ERASE, WRAL, ERAL) are only accepted after an EWEN (Erase/Write Enable) command, and are disabled by EWDS (Erase/Write Disable). This prevents accidental writes during power transients or firmware errors - no hardware WP pin is present, so protection relies entirely on correct command sequencing.
AT93C66-10PC-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- 3-Wire Serial
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66-10PC-2.7 FAQ
1.How can I place an order for AT93C66-10PC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10PC-2.7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT93C66-10PC-2.7 reliable?
The price and inventory of AT93C66-10PC-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66-10PC-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66-10PC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10PC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10PC-2.7?
AT93C66-10PC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10PC-2.7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT93C66-10PC-2.7?
For technical support, including AT93C66-10PC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10PC-2.7 requirements.
6.How does Aetrix verify that AT93C66-10PC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10PC-2.7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT93C66-10PC-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66-10PC-2.7?
All AT93C66-10PC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10PC-2.7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT93C66-10PC-2.7 part is unused and in its original packaging.
Return procedure for AT93C66-10PC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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