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Microchip Technology AT93C66-10PI
- Part No.:
- AT93C66-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66-10PI.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,982
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Product details
Overview
AT93C66-10PI 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, rated for industrial temperature (−40°C to +85°C), and operating from 2.7V to 5.5V supply. It delivers self-timed write cycles ≤10 ms, 1 million write endurance, and 100-year data retention - used in embedded system configuration storage, calibration data retention, and boot parameter storage.
For engineers reviewing the AT93C66-10PI datasheet, AT93C66-10PI pinout, AT93C66-10PI application, or AT93C66-10PI equivalent, key selection factors include voltage range compatibility (2.7–5.5V), industrial-grade temperature rating, 3-wire serial interface timing at up to 1 MHz (VCC = 2.7V), ORG-pin-configurable memory width, and PDIP/SOIC/TSSOP package options.
Technical Context
The AT93C66-10PI 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. Memory organization is dynamically selected by the ORG pin: tied to VCC enables 256 × 16 mode; grounded enables 512 × 8 mode.
It features hardware-controlled write enable sequence (EWEN required before programming), READY/BUSY status reporting via DO pin during write/erase, and no separate erase cycle needed prior to write. All operations are self-timed, with tWP ≤10 ms at 4.5–5.5V and ≤1 ms at 2.7–5.5V per datasheet AC characteristics table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16, user-selectable via ORG pin) |
| Supply Voltage Range | 2.7V to 5.5V - supports mixed-voltage system integration without level shifters |
| Write Cycle Time | ≤10 ms max (at 4.5–5.5V); ≤1 ms max (at 2.7–5.5V) - enables deterministic firmware update latency |
| Endurance | 1 million write/erase cycles - suitable for frequent recalibration or logging applications |
| Data Retention | 100 years at 25°C - ensures long-term reliability in unattended equipment |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor IoT nodes |
| Interface Speed | Up to 1 MHz clock rate at 2.7V (tSKH/tSKL ≥500 ns) - compatible with low-power microcontrollers |
Pinout & Package
AT93C66-10PI is supplied in an 8-pin PDIP (package code 8P3) with 0.300" width, RoHS-compliant lead finish, and through-hole mounting. Pin 1 is marked with notch or dot; pinout matches JEDEC-standard SOIC and TSSOP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; high state enables READY/BUSY status read on DO |
| SK | Serial Clock | Synchronous edge-triggered input; rising edge latches DI, falling edge clocks DO; min pulse width 500 ns at 2.7V |
| DI | Data Input | Serial instruction/address/data input; accepts 7-bit start bit + op-code + address + data per instruction set |
| DO | Data Output | Tri-state serial output; drives data during READ; reports READY ('1') or BUSY ('0') after CS high during write/erase |
| GND | Ground Reference | 0V return path for all I/O and power; requires low-impedance PCB connection to minimize noise coupling |
| VCC | Power Supply | 2.7–5.5V main supply; decoupling capacitor (0.1 µF ceramic) recommended within 10 mm of VCC/GND pins |
| ORG | Organization Select | Logic-high → 256 × 16 mode; logic-low → 512 × 8 mode; internal ~1 MΩ pull-up defaults to x16 if floating (not on 1.8V variants) |
| DC | No Connect | Internally unused; must be left open 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 need for software remapping or external logic |
| Multi-voltage operation | Single device supports 2.7–5.5V range - reduces BOM count across 3.3V and 5V system variants |
| Self-timed write/erase | No external timing control required; DO pin provides real-time BUSY/READY feedback - simplifies host firmware polling logic |
| High-reliability nonvolatile storage | 1M write cycles and 100-year retention - meets industrial lifecycle requirements without wear-leveling firmware |
| Industrial temperature qualification | Rated −40°C to +85°C with full DC/AC specs guaranteed - validated for factory automation and energy metering |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) Parameter Retention |
|---|---|
Use Scenario: Storing I/O mapping, calibration offsets, and fault history in programmable logic controllers deployed in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed infrequently during startup or maintenance mode via 3-wire SPI-like interface. Use Value: Eliminates battery-backed SRAM; withstands wide temperature swings and vibration; retains settings through 10+ year deployments without refresh. |
Use Scenario: Holding seat position memory, mirror angle presets, and lighting profiles in 12V automotive BCMs. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to 8-bit MCU over dedicated GPIO lines; powered directly from vehicle's 5V rail. Use Value: Operates reliably at 2.7V during cold-crank conditions; 1M endurance supports daily user adjustments over 15-year vehicle life. |
| Medical Infusion Pump Calibration Data | Smart Meter Firmware Boot Parameters |
Use Scenario: Storing flow-rate calibration coefficients, sensor offset corrections, and usage logs in Class II medical devices requiring traceable data integrity. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store accessed only during service mode; write-protected via EWDS after initial setup. Use Value: 100-year retention ensures calibration validity across device lifetime; ESD >4 kV protects against handling damage during field servicing. |
Use Scenario: Holding secure boot keys, meter ID, tariff tables, and firmware update flags in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Primary nonvolatile parameter store initialized at factory and updated only during certified firmware upgrades. Use Value: Industrial temp rating ensures operation inside sealed outdoor enclosures; 2.7–5.5V range accommodates aging power supplies over 20-year deployment. |
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 (4-wire), 1.8–5.5V, 5 ms write time, WLCSP package option | Higher density, faster interface, but requires additional chip select line and SPI controller support | Select when migrating to SPI-based platforms or needing >4 kbit capacity; not pin-compatible |
| STK12C68-55I | 8-kbit NVSRAM with automatic store-on-power-loss, 5V-only, 55 ns access, SOIC-28 | Byte-level random access, instant-write capability, but larger footprint and higher cost | Choose for applications requiring zero-latency writes or frequent byte updates without wear concerns |
Compared with M95M04-DRMN6TP/K and STK12C68-55I, the AT93C66-10PI offers optimal balance of industrial temperature support, ultra-low standby current (<10 µA at 2.7V), minimal pin count (3-wire), and proven field reliability in cost-sensitive embedded systems - making it preferred for legacy designs and resource-constrained MCUs.
Availability
AT93C66-10PI is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical device calibration storage, and smart utility metering requiring stable component supply across extended product lifecycles.
Supply support for AT93C66-10PI 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 AT93C66-10PI belongs to Microchip's legacy serial EEPROM product line designed for robust, low-pin-count nonvolatile storage in space- and power-constrained industrial and automotive applications.
FAQ
What is the maximum clock frequency supported by AT93C66-10PI at 2.7V?
The AT93C66-10PI supports a maximum SK clock frequency of 1 MHz at VCC = 2.7V to 5.5V, with minimum SK high/low times of 500 ns each. This is confirmed in the AC Characteristics table (page 4) under "fSK" and "tSKH/tSKL" rows for the 2.7V ≤ VCC ≤ 5.5V condition. The AT93C66-10PI maintains reliable communication at this rate across its full industrial temperature range.
Does AT93C66-10PI require an external pull-up on the ORG pin?
No - the AT93C66-10PI includes an internal ~1 MΩ pull-up on the ORG pin, defaulting to 256 × 16 organization when left unconnected. This behavior is explicitly documented in the "Absolute Maximum Ratings" note on page 2. The AT93C66-10PI does not require external biasing unless 512 × 8 mode is desired (then ORG must be tied to GND).
Can AT93C66-10PI be used in 1.8V systems?
No - the AT93C66-10PI is specified for 2.7V to 5.5V operation only. The 1.8V variant is designated separately (e.g., AT93C66-10PI-1.8). Using AT93C66-10PI below 2.7V violates absolute maximum ratings and risks unreliable read/write behavior or data corruption. Always verify VCC compliance per ordering code suffix.
How is write protection implemented on AT93C66-10PI?
Write protection on AT93C66-10PI is enforced via the Erase/Write Disable (EWDS) instruction, which disables all programming modes (WRITE, ERASE, ERAL, WRAL) until EWEN is reissued or power is cycled. The AT93C66-10PI powers up in EWDS state by default, preventing accidental writes. No hardware write-protect pin exists - protection is purely instruction-based and software-controlled.
What package types are available for AT93C66-10PI?
The AT93C66-10PI is offered in four package types: 8-pin PDIP (8P3), 8-lead JEDEC SOIC (8S1), 8-lead EIAJ SOIC (8S2), and 8-lead TSSOP (8T). All share identical pinout and electrical specifications. The "PI" suffix denotes industrial temperature grade (−40°C to +85°C) and applies uniformly across these packages per the AT93C66 Ordering Information table (page 14).
AT93C66-10PI 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66-10PI FAQ
1.How can I place an order for AT93C66-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10PI 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 reliable?
The price and inventory of AT93C66-10PI 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 is usually 5 days.
3.What payment methods are accepted for AT93C66-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10PI?
AT93C66-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10PI 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?
For technical support, including AT93C66-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10PI requirements.
6.How does Aetrix verify that AT93C66-10PI is sourced from the original manufacturer or authorized distributors?
All AT93C66-10PI 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 meets industry standards.
7.What is the process for return or replacement of AT93C66-10PI?
All AT93C66-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10PI, 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 part is unused and in its original packaging.
Return procedure for AT93C66-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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