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Microchip Technology AT93C66-10PI-1.8
- Part No.:
- AT93C66-10PI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66-10PI-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,193
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Product details
Overview
AT93C66-10PI-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, supporting 1.8V to 5.5V operation, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, and automotive-grade reliability. It delivers 1 million write cycles and 100-year data retention in an 8-lead PDIP package, used for configuration storage in industrial controllers and embedded power management systems.
For engineers reviewing the AT93C66-10PI-1.8 datasheet, AT93C66-10PI-1.8 pinout, AT93C66-10PI-1.8 application, or AT93C66-10PI-1.8 equivalent, key selection criteria include low-voltage compatibility (1.8V min), self-timed 10 ms write cycle, standby current ≤0.1 µA at 1.8V, and support for READ/ERASE/WRITE/ERAL/WRAL instruction set with Ready/Busy status reporting.
Technical Context
The AT93C66-10PI-1.8 implements a synchronous three-wire serial interface (CS/SK/DI/DO) with start-bit–driven command protocol and internal address decoding. Its dual-word-width architecture (8-bit or 16-bit mode) is selected by ORG pin voltage level - tied to VCC for x16, ground for x8 - and is fully functional across its 1.8V–5.5V supply range.
Write operations require explicit EWEN enable followed by WRITE or WRAL; ERAL and WRAL are restricted to VCC ≥4.5V. The DO pin provides real-time Ready/Busy status during active programming when CS is asserted high after tCS ≥250 ns, enabling host synchronization without polling overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact nonvolatile storage for calibration tables or device IDs |
| Supply Voltage | 1.8V to 5.5V - supports direct interfacing with 1.8V logic and mixed-voltage systems without level shifters |
| Write Cycle Time | Max 10 ms - self-timed; eliminates need for external timing control or erase-before-write sequences |
| Endurance | 1 million write cycles - suitable for field-updatable firmware parameters or counters with frequent updates |
| Data Retention | 100 years at TA ≤85°C - ensures long-term integrity of stored configuration data in unpowered equipment |
| Standby Current | ≤0.1 µA at VCC = 1.8V - critical for battery-backed or energy-harvesting applications requiring ultra-low quiescent power |
| Interface Clock Rate | 0.25 MHz at 1.8V - defines maximum serial throughput (≈200 kbps raw) under lowest-voltage operation |
Pinout & Package
AT93C66-10PI-1.8 uses an 8-lead PDIP (8P3) package: 0.300" wide, through-hole mounting, RoHS-compliant lead finish. Pin 1 is bottom-left corner with notch orientation per JEDEC MS-001 BA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; initiates command decode on rising edge |
| SK | Serial Clock | Synchronous input clock; rising edge samples DI and shifts DO; frequency up to 2 MHz at 5V, 0.25 MHz at 1.8V |
| DI | Data Input | Serial command/data input; accepts start bit + opcode + address + data; latched on SK rising edge |
| DO | Data Output | Serial read data or Ready/Busy status; outputs dummy "0" before data; tri-states when CS high |
| GND | Ground Reference | Primary return path for VCC and I/O; requires low-impedance connection to minimize noise coupling into serial interface |
| VCC | Power Supply | 1.8V–5.5V single supply; powers internal logic, memory array, and I/O buffers; decoupling capacitor required |
| ORG | Organization Select | Logic-high = 256×16 mode; logic-low = 512×8 mode; floating defaults to x16 (internal 1 MΩ pull-up) |
| DC | No Connect | Internally unused; must be left unconnected or tied to GND/VCC - no electrical function or loading impact |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Runtime-configurable 512 × 8 or 256 × 16 word width via ORG pin, optimizing bus efficiency for 8-bit or 16-bit microcontrollers |
| Self-timed write cycle | Fixed 10 ms max duration with automatic internal timing - removes host software timing dependencies and simplifies firmware |
| Ready/Busy status reporting | DO pin outputs logic "1" (ready) or "0" (busy) when CS is raised post-command, enabling efficient polling-free host synchronization |
| Low-voltage operation down to 1.8V | Full functionality including 0.25 MHz clock rate and ≤0.1 µA standby current - enables direct integration into 1.8V SoC subsystems |
| Automotive-grade reliability | Rated for −40°C to +85°C operation, 1M write cycles, and 100-year data retention - validated for industrial control and automotive body electronics |
Applications
| Industrial Sensor Calibration | Embedded Power Management |
|---|---|
Use Scenario: Storing temperature-compensated sensor offset/gain coefficients in factory-calibrated pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization; no timing-critical access during runtime. Use Value: Enables one-time factory calibration with guaranteed 100-year retention, eliminating need for external calibration hardware or reprogramming in field. |
Use Scenario: Holding overvoltage/undervoltage trip thresholds and fault log history in DC-DC controller modules. IC Role / Device Role / Timing Role: Configuration and event logging storage; accessed asynchronously via SPI-compatible three-wire interface. Use Value: Supports robust fault recovery using 1M endurance writes and 1.8V operation compatible with low-power supervisor ICs. |
| Consumer Audio Device Settings | Automotive Body Control Unit |
Use Scenario: Preserving user EQ presets, volume levels, and input source selections across power cycles in portable Bluetooth speakers. IC Role / Device Role / Timing Role: Low-power parameter store; written infrequently during UI interaction, read at boot. Use Value: Ultra-low 0.1 µA standby current extends battery life; 1.8V compatibility allows direct connection to audio SoC I/O rails. |
Use Scenario: Storing door lock configuration, mirror position memory, and lighting profiles in vehicle BCMs. IC Role / Device Role / Timing Role: Automotive-qualified nonvolatile memory for safety-critical configuration; accessed during CAN-initiated setup routines. Use Value: AEC-Q100–compatible operation and 100-year retention ensure reliable personalization data persistence over full vehicle lifetime. |
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-1.8 | Successor with enhanced ESD rating (4 kV HBM), improved AC timing margins, and updated qualification per AEC-Q100 Rev G. | Preferred for new automotive designs requiring latest qualification; identical pinout and instruction set. | Select AT93C66A-10PI-1.8 for new designs where long-term supply assurance and latest automotive compliance are required. |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM (vs. 4-kbit); quad I/O capable; 1.7V–5.5V; 5 ms write cycle; different command set and pinout (8-lead SO8). | Higher density and faster write for firmware patch storage; not pin-compatible or instruction-compatible. | Choose M95M04-DRMN6TP/K only when migrating to SPI interface and requiring >4-kbit capacity - redesign required. |
Compared with AT93C66-10PI-1.8, the AT93C66A-10PI-1.8 offers drop-in qualification upgrades without layout change, while M95M04-DRMN6TP/K demands interface redesign but delivers 1000× more capacity and faster writes - trade-offs center on legacy compatibility versus future scalability.
Availability
AT93C66-10PI-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, consumer audio settings, and automotive body control unit applications requiring stable component supply and long-term lifecycle support.
Supply support for AT93C66-10PI-1.8 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 legacy Atmel memory products, delivering high-reliability, low-power semiconductor solutions for industrial, automotive, and consumer markets.
The AT93C66-10PI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, space-constrained applications needing robust nonvolatile storage with minimal external components and ultra-low power consumption.
FAQ
What is the minimum operating voltage for AT93C66-10PI-1.8?
The AT93C66-10PI-1.8 operates down to 1.8V, as confirmed in the Absolute Maximum Ratings and DC Characteristics tables. At this voltage, it supports full functionality including READ, WRITE, and EWEN instructions, with AC timing adjusted to 0.25 MHz maximum SK frequency and standby current specified at ≤0.1 µA.
Does AT93C66-10PI-1.8 support both 8-bit and 16-bit memory organization?
Yes, AT93C66-10PI-1.8 supports user-selectable organization: 512 × 8 bits when ORG is grounded, or 256 × 16 bits when ORG is tied to VCC (or left floating, due to internal 1 MΩ pull-up). This dual-mode capability is explicitly documented in the Features and Functional Description sections.
Is AT93C66-10PI-1.8 pin-compatible with AT93C66A-10PI-1.8?
Yes, AT93C66-10PI-1.8 and AT93C66A-10PI-1.8 share identical 8-lead PDIP (8P3) mechanical footprint, pin assignment, and electrical interface. The AT93C66A variant is a direct replacement with enhanced ESD and qualification - no PCB changes are required for migration.
What is the maximum clock frequency supported by AT93C66-10PI-1.8 at 1.8V?
At VCC = 1.8V, the AT93C66-10PI-1.8 supports a maximum SK clock frequency of 0.25 MHz, as specified in Table 4 (AC Characteristics). This limit ensures reliable setup/hold timing for DI and DO signals under low-voltage conditions.
How does the Ready/Busy status work on AT93C66-10PI-1.8 during a write cycle?
During a WRITE or ERASE cycle, asserting CS high after tCS ≥250 ns causes the DO pin to output Ready/Busy status: logic "1" indicates completion and readiness for next command; logic "0" indicates ongoing operation. This feature is confirmed in the Functional Description and Timing Diagrams (Figures 6 and 8).
AT93C66-10PI-1.8 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66-10PI-1.8 FAQ
1.How can I place an order for AT93C66-10PI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10PI-1.8 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-1.8 reliable?
The price and inventory of AT93C66-10PI-1.8 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-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66-10PI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10PI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10PI-1.8?
AT93C66-10PI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10PI-1.8 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-1.8?
For technical support, including AT93C66-10PI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10PI-1.8 requirements.
6.How does Aetrix verify that AT93C66-10PI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10PI-1.8 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-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66-10PI-1.8?
All AT93C66-10PI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10PI-1.8, 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-1.8 part is unused and in its original packaging.
Return procedure for AT93C66-10PI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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