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Microchip Technology AT93C66-10PI-2.7
- Part No.:
- AT93C66-10PI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66-10PI-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,340
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Product details
Overview
AT93C66-10PI-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 1 million write cycles and 100-year data retention in an 8-lead PDIP package, used for configuration storage in embedded controllers and sensor modules.
For engineers reviewing the AT93C66-10PI-2.7 datasheet, AT93C66-10PI-2.7 pinout, AT93C66-10PI-2.7 application, or AT93C66-10PI-2.7 equivalent, key selection criteria include voltage compatibility (2.7V min), self-timed 10 ms write cycle, three-wire serial protocol timing constraints, and ORG-pin-configurable memory width - all critical for low-power microcontroller peripheral interfacing and legacy system upgrades.
Technical Context
The AT93C66-10PI-2.7 implements a synchronous three-wire serial interface (CS/SK/DI/DO) with start-bit–driven instruction decoding. Its internal architecture supports dual word-width addressing (8- or 16-bit) selected by the ORG pin state, enabling flexible byte- or word-oriented access without external logic.
Write operations require explicit EWEN enable followed by WRITE or WRAL instructions; erase is integrated into write cycles, eliminating separate erase steps. Ready/Busy status is reported on DO when CS is raised during self-timed tWP (max 10 ms), supporting non-blocking host polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), directly configurable at power-up via ORG pin connection |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interface with 3.3V and 5V microcontrollers without level shifting |
| Write Cycle Time | Max 10 ms - defines minimum interval between successive writes; no external timing control required |
| Endurance | 1 million write cycles - supports frequent calibration or logging updates over product lifetime |
| Data Retention | 100 years at 25°C - ensures long-term reliability for firmware configuration and device identity storage |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood applications |
| Interface Clock Rate | 2 MHz at 5V - sets maximum SPI-like throughput; scales down per VCC (e.g., 0.25 MHz at 1.8V) |
Pinout & Package
AT93C66-10PI-2.7 uses an 8-lead PDIP (8P3) package: 0.300" wide, through-hole mounting, 0.100" lead pitch, JEDEC MS-001 compliant. Pin 1 is bottom-left corner with notch orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for full instruction sequence; rising edge initiates command decode |
| SK | Serial Clock | Input clock synchronizing DI sampling and DO output; max 2 MHz at 5V |
| DI | Data Input | Serial command/data input; accepts 7-bit instruction + address + data per WRITE |
| DO | Data Output | Open-drain output; returns read data or Ready/Busy status ('1' = ready, '0' = busy) |
| GND | Ground Reference | Signal and power return; must be low-impedance path to minimize noise on SK/DI/DO |
| VCC | Power Supply | 2.7V–5.5V main supply; powers internal logic and charge pump for write/erase |
| ORG | Organization Select | Logic-high = 256×16 mode; logic-low = 512×8 mode; unconnected defaults to x16 (with internal 1 MΩ pull-up) |
| DC | No Connect | Internally unused; must be left floating or tied to GND/VCC per layout best practice - no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout via ORG pin - eliminates software bit-packing overhead |
| Self-timed write cycle | Internal timing engine completes erase+write in ≤10 ms - removes need for host-controlled delay loops |
| Three-wire serial interface | Minimal pin count (CS/SK/DI/DO) reduces MCU GPIO usage and PCB routing complexity |
| Low-voltage operation | 2.7V minimum supply enables direct integration with battery-backed or energy-harvesting systems |
| Automotive-grade qualification | Extended temperature range and AEC-Q200 alignment support deployment in vehicle ECUs and ADAS sensors |
Applications
| Industrial PLC Configuration Storage | Automotive Sensor Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers with limited nonvolatile memory. IC Role / Device Role / Timing Role: Serial configuration EEPROM accessed during boot and runtime reconfiguration via MCU GPIO-driven three-wire interface. Use Value: Enables field-upgradable parameter sets without firmware reflashing; 1M endurance supports >1000 factory calibrations over product life. | Use Scenario: Retaining temperature-compensated offset/gain coefficients for pressure or position sensors in engine control units. IC Role / Device Role / Timing Role: Nonvolatile data register holding calibration constants read at startup and updated after sensor recalibration events. Use Value: Maintains accuracy across thermal cycles and vehicle lifetime; −40°C to +85°C rating matches under-hood environmental stress. |
| Consumer Appliance User Settings | Medical Device Safety Parameters |
Use Scenario: Saving user preferences (e.g., timer settings, display brightness) in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Low-power serial EEPROM written infrequently during menu navigation, read at power-on reset. Use Value: 100-year data retention ensures settings persist across 10+ year product lifetimes; 2.7V operation supports brown-out tolerant designs. | Use Scenario: Storing FDA-mandated safety limits and device-specific operational constraints in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant configuration store accessed only by secure bootloader during certified initialization sequences. Use Value: High reliability (1M write cycles) supports audit-log timestamping; industrial temp grade validates performance in clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT93C66A-10PI-2.7 | Pin-compatible revision with enhanced ESD robustness and improved write-cycle consistency; same 4-kbit capacity and PDIP-8 package | Recommended for new designs per manufacturer notice; identical functional interface but tighter AC parameter tolerances | Select when designing new products requiring long-term supply assurance and latest characterization data |
| M95640-DW DW | 64-kbit SPI EEPROM (8×8-kbit pages); quad I/O capable; operates down to 1.8V; SO8 package only | Higher density and faster 20 MHz SPI interface, but requires different command set and lacks ORG-pin organization flexibility | Choose for bandwidth-constrained systems needing larger config space or 1.8V compatibility - not drop-in replacement |
Compared with AT93C66-10PI-2.7, the AT93C66A-10PI-2.7 offers verified longevity improvements while maintaining identical pinout and instruction set, whereas the M95640-DW provides greater capacity and speed at the cost of interface redesign and loss of hardware-configurable word width.
Availability
AT93C66-10PI-2.7 is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and consumer electronics requiring stable component supply, extended temperature operation, and proven EEPROM reliability.
Supply support for AT93C66-10PI-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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with broad industrial and automotive qualifications.
The AT93C66 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable configuration storage with minimal MCU resource usage.
FAQ
What is the memory organization of AT93C66-10PI-2.7 and how is it selected?
The AT93C66-10PI-2.7 supports two memory organizations: 512 × 8 bits or 256 × 16 bits. Selection is controlled by the ORG pin - tied to VCC for 256×16 mode, grounded for 512×8 mode. If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This hardware-based configuration avoids firmware overhead and ensures deterministic boot behavior in the AT93C66-10PI-2.7.
Does AT93C66-10PI-2.7 require a separate erase command before writing?
No, the AT93C66-10PI-2.7 integrates erase functionality into the write cycle. Each WRITE instruction automatically erases the target location before programming new data, eliminating the need for discrete ERASE commands. This simplifies firmware implementation and reduces write latency compared to EEPROMs requiring explicit erase phases - a core design feature of the AT93C66-10PI-2.7.
What is the maximum clock frequency supported by AT93C66-10PI-2.7 at 3.3V supply?
At 3.3V supply, the AT93C66-10PI-2.7 supports a maximum SK clock frequency of 1 MHz, as specified in Table 4 (AC Characteristics) for the 2.7V ≤ VCC ≤ 5.5V range. This is lower than the 2 MHz maximum at 5V but ensures robust timing margins across voltage and temperature. The AT93C66-10PI-2.7 maintains full functionality across its rated 2.7–5.5V range without derating penalties.
How does the AT93C66-10PI-2.7 indicate write completion status?
The AT93C66-10PI-2.7 reports Ready/Busy status on the DO pin: when CS is raised after initiating a WRITE, DO outputs '0' during programming and transitions to '1' when complete. This allows the host MCU to poll without fixed delays. The AT93C66-10PI-2.7 guarantees this status is valid only if CS remains low for ≥250 ns before being raised - a timing requirement defined in tCS.
Is AT93C66-10PI-2.7 suitable for automotive applications?
Yes, the AT93C66-10PI-2.7 is explicitly qualified for automotive-grade use with extended temperature operation (−40°C to +85°C), lead-free/halogen-free packaging, and high reliability (1M write cycles, 100-year retention). Its datasheet states "Automotive Grade, Extended Temperature and Lead-Free/Halogen-Free Devices Available", confirming suitability for ECU, body control, and sensor module applications where the AT93C66-10PI-2.7 meets AEC-Q200-aligned stress requirements.
AT93C66-10PI-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66-10PI-2.7 FAQ
1.How can I place an order for AT93C66-10PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10PI-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 AT93C66-10PI-2.7 reliable?
The price and inventory of AT93C66-10PI-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 AT93C66-10PI-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66-10PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10PI-2.7?
AT93C66-10PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10PI-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 AT93C66-10PI-2.7?
For technical support, including AT93C66-10PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10PI-2.7 requirements.
6.How does Aetrix verify that AT93C66-10PI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10PI-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 AT93C66-10PI-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66-10PI-2.7?
All AT93C66-10PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10PI-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 AT93C66-10PI-2.7 part is unused and in its original packaging.
Return procedure for AT93C66-10PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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