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Microchip Technology AT93C66-10SI
- Part No.:
- AT93C66-10SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66-10SI.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,753
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Product details
Overview
AT93C66-10SI from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, supporting user-selectable 512 × 8 or 256 × 16 organization via the ORG pin, operating from 2.7V to 5.5V, and rated for industrial temperature range (−40°C to +85°C). It delivers 2 MHz clock compatibility at 5V, self-timed write cycles ≤10 ms, and is used in embedded system configuration storage where low-voltage operation and long-term data retention are critical.
For engineers reviewing the AT93C66-10SI datasheet, AT93C66-10SI pinout, AT93C66-10SI application, or AT93C66-10SI equivalent, key selection considerations include voltage range compatibility (2.7–5.5V), industrial-grade temperature rating, 4-kbit density with x8/x16 configurability, SOIC-8 package footprint, and 3-wire serial interface timing compliance.
Technical Context
The AT93C66-10SI implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its internal organization is dynamically selected by the ORG pin state-logic high enables 256 × 16 mode; logic low enables 512 × 8 mode.
Write operations require explicit Erase/Write Enable (EWEN) prior to programming, and status feedback is provided via DO pin during CS high after tCS ≥250 ns. The device supports READY/BUSY polling and features on-chip charge pump for reliable 5V-compatible programming across its full 2.7–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4096 bits (512 × 8 or 256 × 16 configurable) |
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration into 3.3V and 5V systems without level-shifting |
| Max Clock Frequency | 2 MHz at VCC = 5V - supports fast read/write cycles in time-critical host interfaces |
| Write Cycle Time | ≤10 ms - deterministic self-timed erase-and-write eliminates external timing control overhead |
| Data Retention | 100 years - ensures long-term reliability in unattended or maintenance-free deployments |
| Endurance | 1 million write cycles - supports frequent reconfiguration in field-upgradable devices |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including motor controls and PLCs |
Pinout & Package
AT93C66-10SI is supplied in an 8-lead JEDEC-standard SOIC package (8S1), 0.150" wide, with standard pinout: Pin 1 = CS, Pin 2 = SK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VCC, Pin 6 = DC (no connect), Pin 7 = ORG, Pin 8 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for serial communication; must be held low for entire instruction cycle |
| SK | Serial Clock | Synchronizes all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Receives instruction opcodes, addresses, and write data; latched on SK rising edge |
| DO | Data Output | Serially outputs read data or READY/BUSY status; high-impedance when CS high |
| VCC | Power Supply | Primary power rail (2.7–5.5V); powers internal logic and charge pump for write operations |
| DC | Don't Connect | No internal connection; must remain unconnected or tied to GND/VCC only if required by board layout |
| ORG | Organization Select | Logic high → 256 × 16 mode; logic low → 512 × 8 mode; internal pull-up defaults to x16 if floating |
| GND | Ground Reference | Return path for all I/O and supply currents; requires low-impedance PCB connection |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout via ORG pin - eliminates firmware dependency for data-width adaptation |
| Low-voltage operation | Full functionality from 2.7V - enables direct use in battery-powered or 3.3V-only systems without regulators |
| Self-timed write cycle | No external wait-state logic required - simplifies host MCU firmware and reduces BOM count |
| Industrial temperature rating | −40°C to +85°C operation - validated for deployment in factory automation, automotive body controllers, and outdoor equipment |
| ESD protection | ≥4000V HBM - enhances robustness during handling and in electrically noisy industrial environments |
Applications
| Industrial Sensor Calibration Storage | Printer Cartridge Identification |
|---|---|
Use Scenario: Storing sensor-specific calibration coefficients, offset/gain values, and linearization tables in factory-calibrated pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding factory-programmed parameters accessed at power-up by host ADC/microcontroller. Use Value: Enables plug-and-play sensor replacement with zero recalibration; leverages 100-year data retention and 1M endurance for field updates. |
Use Scenario: Authenticating OEM ink/toner cartridges and storing usage counters, remaining page counts, and model-specific feature flags. IC Role / Device Role / Timing Role: Secure, tamper-resistant identity and lifecycle tracking element interfaced via low-pin-count 3-wire bus on cartridge PCB. Use Value: Supports anti-counterfeiting via encrypted reads/writes; 2.7–5.5V operation accommodates diverse cartridge power architectures. |
| Motor Drive Parameter Backup | Network Equipment Configuration |
Use Scenario: Preserving motor tuning parameters (PID gains, current limits, commutation offsets) across power cycles in BLDC or stepper drive modules. IC Role / Device Role / Timing Role: Persistent settings store accessed during boot sequence to restore operational state without host intervention. Use Value: Eliminates need for external backup capacitors or supercapacitors; 10 ms max write time allows rapid parameter save during fault shutdown. |
Use Scenario: Holding MAC address, firmware version, port mapping, and security keys in managed Ethernet switches and PoE injectors. IC Role / Device Role / Timing Role: System-level configuration vault accessed by baseboard management controller (BMC) or switch ASIC during initialization. Use Value: JEDEC SOIC-8 footprint enables compact placement near controller; industrial temp rating ensures reliability in enclosed telecom cabinets. |
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, 1.8–5.5V, 20 MHz max clock, WLCSP-8 package | Higher density, faster interface, but requires SPI-capable host and different protocol stack | Select when migrating to SPI infrastructure or requiring >4 kbit capacity; not pin-compatible |
| STK12C68-5LH1T | 8-kbit NVSRAM with parallel interface, 4.5–5.5V only, 70 ns access, SOIC-28 | Byte-level random access and SRAM-like speed, but larger footprint and narrower voltage range | Choose for applications needing frequent, low-latency writes without wear leveling; incompatible interface and package |
Compared with M95M04-DRMN6TP/K and STK12C68-5LH1T, the AT93C66-10SI offers optimal balance of 3-wire simplicity, industrial temperature support, and 2.7–5.5V flexibility in a compact SOIC-8 - making it ideal for cost-sensitive, space-constrained designs where SPI migration or parallel bus overhead is impractical.
Availability
AT93C66-10SI is available at Aetrix Electronics and suitable for industrial motor drives, printer consumables, sensor calibration modules, and network equipment requiring stable component supply across extended product lifecycles.
Supply support for AT93C66-10SI 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 support for the legacy AT93C family of serial EEPROMs, delivering high-reliability nonvolatile memory solutions for industrial and automotive markets.
The AT93C66 is part of Atmel's 3-wire serial EEPROM product line, designed specifically for embedded systems requiring simple, low-pin-count, low-power configuration storage with guaranteed data integrity over decades.
FAQ
What is the maximum clock frequency supported by the AT93C66-10SI at 3.3V operation?
The AT93C66-10SI supports up to 1 MHz maximum clock frequency when operated at 2.7V–5.5V, per AC characteristics table - at 3.3V, this corresponds to tSKH/tSKL ≥500 ns, enabling reliable communication with most 3.3V microcontrollers without additional timing constraints. The AT93C66-10SI maintains full functionality across its specified voltage range without derating.
Does the AT93C66-10SI require an external pull-up resistor on the DO pin?
No, the AT93C66-10SI features an internally weak pull-up on the DO pin during active output, and high-impedance state when CS is high or during standby. External pull-ups are unnecessary and may interfere with READY/BUSY status polling. The AT93C66-10SI is designed for direct connection to CMOS inputs without additional biasing components.
Can the ORG pin of the AT93C66-10SI be left floating, and what organization results?
Yes, the ORG pin of the AT93C66-10SI has an internal ~1 MΩ pull-up, so leaving it unconnected selects the 256 × 16 organization. This behavior is explicitly documented and tested - no external resistor is needed unless the 512 × 8 mode is required, in which case ORG must be actively driven low. The AT93C66-10SI defaults to x16 mode for simplified layout.
Is the AT93C66-10SI compatible with the AT93C46 or AT93C56 pinout and software interface?
Yes - the AT93C66-10SI shares identical pinout, instruction set, timing parameters, and 3-wire protocol with AT93C46 and AT93C56. Software written for those parts will operate unchanged on the AT93C66-10SI, though address width increases to 9 bits (A8–A0) to accommodate its 4-kbit capacity. The AT93C66-10SI is a drop-in upgrade for higher-density requirements.
What is the minimum pulse width requirement for CS low time during a WRITE instruction on the AT93C66-10SI?
The AT93C66-10SI requires a minimum CS low time (tCS) of 250 ns when VCC = 2.7–5.5V, as specified in the AC Characteristics table. This ensures proper instruction latching and internal state machine synchronization. Violating this spec may cause incomplete command execution or status reporting errors. The AT93C66-10SI enforces this timing rigorously across its full operating range.
AT93C66-10SI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66-10SI FAQ
1.How can I place an order for AT93C66-10SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10SI 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 AT93C66-10SI reliable?
The price and inventory of AT93C66-10SI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66-10SI is usually 5 days.
3.What payment methods are accepted for AT93C66-10SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10SI?
AT93C66-10SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10SI 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 AT93C66-10SI?
For technical support, including AT93C66-10SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10SI requirements.
6.How does Aetrix verify that AT93C66-10SI is sourced from the original manufacturer or authorized distributors?
All AT93C66-10SI 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 AT93C66-10SI meets industry standards.
7.What is the process for return or replacement of AT93C66-10SI?
All AT93C66-10SI units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10SI, 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 AT93C66-10SI part is unused and in its original packaging.
Return procedure for AT93C66-10SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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