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Microchip Technology AT93C66-10PI-2.5
- Part No.:
- AT93C66-10PI-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66-10PI-2.5.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,316
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Product details
Overview
AT93C66-10PI-2.5 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, user-selectable 512 × 8 or 256 × 16 organization, 2.5V–5.5V supply range, and industrial temperature rating (−40°C to +85°C). It delivers self-timed write cycles ≤10 ms, 1 million write endurance, and 100-year data retention for configuration storage in embedded controllers and power management systems.
For engineers reviewing the AT93C66-10PI-2.5 datasheet, AT93C66-10PI-2.5 pinout, AT93C66-10PI-2.5 application, or AT93C66-10PI-2.5 equivalent, key selection criteria include low-voltage operation down to 2.5V, industrial-grade reliability, 8-pin PDIP/SOIC/TSSOP package compatibility, and support for READ/ERASE/WRITE instructions via CS/SK/DI/DO interface.
Technical Context
The AT93C66-10PI-2.5 implements a synchronous 3-wire serial interface with Chip Select (CS), Serial Clock (SK), and bidirectional Data I/O (DI/DO). Its ORG pin selects internal memory organization (x8 or x16), enabling flexible byte- or word-oriented access without external logic.
Operation requires an Erase/Write Enable (EWEN) instruction before programming; subsequent WRITE and ERASE commands are self-timed with READY/BUSY status reported on DO. The device supports full-array ERAL and WRAL instructions at 5.0V ±10%, and maintains data integrity through ESD protection >4000V and robust standby current (≤10 µA at 2.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16) |
| Supply Voltage Range | 2.5V to 5.5V - enables direct interfacing with 2.5V/3.3V/5V microcontrollers without level shifters |
| Write Cycle Time | ≤10 ms - deterministic timing simplifies host firmware wait-state handling |
| Endurance | 1 million write cycles - supports frequent calibration or logging updates in field-deployed equipment |
| Data Retention | 100 years at 25°C - ensures long-term configuration persistence across product lifecycles |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor IoT nodes |
| Interface Speed | 500 kHz max at 2.5V - balances noise immunity and throughput for cost-sensitive PCB layouts |
Pinout & Package
AT93C66-10PI-2.5 is supplied in 8-pin PDIP (8P3), JEDEC SOIC (8S1), EIAJ SOIC (8S2), and TSSOP (8T) packages. All variants share identical pin functions and numbering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence including address and data transfer |
| SK | Serial Clock | Input clock synchronizing all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Serial instruction, address, and write data input; high-impedance when not selected |
| DO | Data Output | Serial read data output; reports READY/BUSY status during write cycles when CS is pulsed high |
| GND | Ground | Reference return path for VCC and all I/O signals; requires low-impedance PCB connection |
| VCC | Power Supply | 2.5V–5.5V supply; bypass capacitor (0.1 µF) required near pin for stable operation |
| ORG | Organization Select | Logic-high = 256 × 16 mode; logic-low = 512 × 8 mode; internal pull-up defaults to x16 if unconnected |
| DC | Don't Connect | No internal connection; must remain floating or tied to GND/VCC per layout constraints - no electrical loading |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout eliminates need for software bit manipulation in host firmware |
| Low-voltage operation (2.5V–5.5V) | Direct compatibility with 2.5V FPGA I/O banks and 3.3V microcontroller GPIOs without voltage translation |
| Self-timed write cycle | No external timing control needed; host reads DO pin status to detect completion, reducing CPU overhead |
| Industrial temperature grade | Guaranteed functionality across −40°C to +85°C ambient, supporting deployment in harsh environments |
| High ESD immunity (>4000V HBM) | Robust handling during board assembly and field service, minimizing latent failures in production lines |
Applications
| Industrial Sensor Calibration | Embedded Power Management |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during system boot and runtime recalibration. Use Value: Enables field-upgradable calibration without firmware changes; 100-year retention ensures accuracy over equipment lifetime. |
Use Scenario: Holding power sequencing parameters, fault log history, and voltage rail thresholds in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Persistent parameter store interfaced by PMBus-compatible microcontrollers via 3-wire protocol. Use Value: Low 2.5V operation allows direct connection to auxiliary 3.3V rails; 1M endurance supports daily log writes for 27 years. |
| Automotive Body Control Module | Consumer Appliance Configuration |
Use Scenario: Saving user preferences (window position, mirror angle) and diagnostic trouble codes in vehicle door modules. IC Role / Device Role / Timing Role: Serial configuration memory accessed by 8-bit MCU over minimal GPIO resources. Use Value: Industrial temperature rating meets AEC-Q100 Grade 3 requirements; 8-pin SOIC fits space-constrained PCBs. |
Use Scenario: Storing language settings, cooking profiles, and safety lock states in smart ovens and washing machines. IC Role / Device Role / Timing Role: Cost-optimized nonvolatile memory for consumer-grade microcontrollers with limited peripheral count. Use Value: 2.5V–5.5V range accommodates both 3.3V and 5V appliance mainboards; PDIP variant simplifies prototyping and repair. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M04-DRMN6TP/K | 4-Mbit SPI interface, 1.8V–5.5V, 5ms write cycle, WLCSP package option | Higher density and faster interface but requires SPI-capable host; no ORG pin flexibility | Select when migrating to SPI-based platforms or requiring >4kbit capacity |
| 25AA040A-I/P | 4-kbit SPI EEPROM, 1.8V–5.5V, 5ms write, 8-pin PDIP/SOIC, no ORG pin | Same density and package footprint but fixed 512 × 8 organization; lacks x16 mode | Choose for drop-in replacement where x16 mode is unused and SPI is preferred over 3-wire |
Compared with M95M04-DRMN6TP/K and 25AA040A-I/P, the AT93C66-10PI-2.5 uniquely supports hardware-selectable memory organization and operates reliably at 2.5V with proven industrial temperature performance, making it optimal for legacy 3-wire designs requiring configurability and long-term stability.
Availability
AT93C66-10PI-2.5 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, automotive body control modules, and consumer appliance configuration requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AT93C66-10PI-2.5 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 continues to manufacture and support the AT93C family of serial EEPROMs with full backward compatibility and long-term product commitment.
The AT93C66 belongs to Atmel's legacy 3-wire serial EEPROM product line, designed specifically for cost-sensitive, resource-constrained embedded systems requiring simple, reliable nonvolatile storage with minimal pin count and flexible voltage operation.
FAQ
What is the maximum clock frequency supported by AT93C66-10PI-2.5 at 2.5V?
The AT93C66-10PI-2.5 supports a maximum SK clock frequency of 500 kHz when operating at 2.5V. This value is specified in the AC Characteristics table under fSK for 2.5V ≤ VCC ≤ 5.5V, ensuring reliable timing margins for noise-prone industrial environments. Higher frequencies require ≥2.7V supply per datasheet limits.
How does the ORG pin affect memory addressing in AT93C66-10PI-2.5?
When ORG is tied to VCC, AT93C66-10PI-2.5 uses 256 × 16 organization with 7-bit addresses (A6–A0); when grounded, it uses 512 × 8 organization with 9-bit addresses (A8–A0). The internal pull-up defaults to x16 mode if ORG is left unconnected, enabling immediate operation without external biasing.
Can AT93C66-10PI-2.5 perform a full-memory erase or write?
Yes - AT93C66-10PI-2.5 supports ERAL (Erase All) and WRAL (Write All) instructions, but only when VCC is within 4.5V–5.5V. These commands are invalid at 2.5V operation; the AT93C66-10PI-2.5 datasheet explicitly restricts them to standard-voltage mode, requiring temporary VCC boost or alternative sector-by-sector handling at low voltage.
What is the standby current consumption of AT93C66-10PI-2.5 at 2.5V?
At 2.5V and TA = −40°C to +85°C, the AT93C66-10PI-2.5 exhibits a maximum standby current (ISB2) of 10.0 µA when CS = 0V. This ultra-low quiescent draw enables battery-backed operation in energy-sensitive applications such as remote sensors and portable diagnostics tools.
Is AT93C66-10PI-2.5 pin-compatible with other AT93Cxx variants in the same package?
Yes - AT93C66-10PI-2.5 shares identical pinout and electrical characteristics with AT93C46-10PI-2.5, AT93C56-10PI-2.5, and AT93C57-10PI-2.5 in 8-pin PDIP, SOIC, and TSSOP packages. However, memory size and address depth differ: AT93C66-10PI-2.5 uses 9-bit addressing (A8–A0) versus 7-bit (A6–A0) for AT93C46, requiring host firmware adaptation.
AT93C66-10PI-2.5 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66-10PI-2.5 FAQ
1.How can I place an order for AT93C66-10PI-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10PI-2.5 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-2.5 reliable?
The price and inventory of AT93C66-10PI-2.5 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-2.5 is usually 5 days.
3.What payment methods are accepted for AT93C66-10PI-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10PI-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10PI-2.5?
AT93C66-10PI-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10PI-2.5 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-2.5?
For technical support, including AT93C66-10PI-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10PI-2.5 requirements.
6.How does Aetrix verify that AT93C66-10PI-2.5 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10PI-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of AT93C66-10PI-2.5?
All AT93C66-10PI-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10PI-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for AT93C66-10PI-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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