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Microchip Technology 93C66C-I/P
- Part No.:
- 93C66C-I/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
93C66C-I/P.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:831
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Product details
Overview
93C66C-I/P from Microchip Technology Inc. is a 4 Kbit serial EEPROM with Microwire-compatible 3-wire interface, ORG-pin-selectable 8-/16-bit word organization, and industrial temperature range (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles. Used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93C66C-I/P datasheet, 93C66C-I/P pinout, 93C66C-I/P application, or 93C66C-I/P equivalent, key selection considerations include VCC range (4.5–5.5 V), ORG-driven word-size flexibility, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers requiring minimal I/O overhead.
Technical Context
The 93C66C-I/P implements a synchronous serial interface using CS, CLK, and DI/DO lines with start-bit detection and opcode-based command execution. Its memory array supports both x8 (ORG = VSS) and x16 (ORG = VCC) configurations, with instruction sets differing by organization mode - 20 clock cycles for READ/WRITE in x8 mode, 27 in x16 mode.
Internal logic includes auto-erase-before-write, EWEN/EWDS write-protection state machine, and voltage-detect circuitry that inhibits operation below 3.8 V. Timing-critical operations (ERASE, ERAL, WRITE, WRAL) are self-timed, with TWC = 2 ms for 93C-series write cycles and TEC = 6 ms for ERAL at 4.5–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16, selectable via ORG pin) |
| VCC range | 4.5 V to 5.5 V - ensures compatibility with 5 V systems and rejects brown-out below 3.8 V |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - requires no additional protocol translation |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in industrial control firmware |
| Data retention | >200 years at 25°C - guarantees long-term calibration data integrity without refresh |
| Operating temp | –40°C to +85°C (Industrial grade) - validated for use in uncontrolled ambient environments |
| Write cycle time | 2 ms (TWC) - enables fast parameter saves without blocking host MCU execution |
Pinout & Package
Package: 8-lead PDIP (P), lead-free Matte Tin finish, through-hole mounting compatible with standard wave-solder processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal logic |
| CLK | Serial Clock | Positive-edge synchronized timing for opcode/address/data; stoppable mid-transfer |
| DI | Data Input | Accepts start bit, opcode, address, and write data; shares net with DO only with series resistor |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference return path for all signals; must be low-impedance for noise immunity |
| ORG | Organization select | Logic high → 256×16 mode; logic low → 512×8 mode; must be statically tied, not floated |
| NC | No internal connection | Pin 7 in PDIP/SOIC - no bond wire; may be left unconnected or grounded per layout needs |
| VCC | Power supply | 4.5–5.5 V input; internal POR triggers at 3.8 V to prevent partial writes during power ramp |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single BOM part to support both 8-bit microcontrollers (ORG = VSS) and 16-bit DSPs (ORG = VCC) |
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond DO status check |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data remnants in unused locations |
| Power-on/off data protection | Hardware-level inhibition below 3.8 V prevents corruption during power-up/down transients |
| Ready/Busy status on DO | Allows non-blocking host polling instead of fixed delay loops, optimizing MCU resource usage |
Applications
| Industrial Sensor Calibration Storage | Legacy Industrial Controller Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during commissioning or recalibration. Use Value: 200-year data retention ensures calibration remains valid across equipment lifetime without battery backup. | Use Scenario: Holding user-defined I/O mapping, PID loop parameters, and alarm thresholds in DIN-rail-mounted automation controllers. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to 8-bit MCUs with limited GPIO, using Microwire-compatible timing. Use Value: ORG pin allows same footprint to serve both legacy 8-bit designs (x8) and newer 16-bit upgrades (x16) without PCB change. |
| Automotive Body Control Module Settings | Medical Device Usage Logs |
Use Scenario: Recording seat position presets, mirror angles, and lighting profiles in automotive BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed during vehicle power-up sequence. Use Value: 1M endurance supports daily reprogramming over 10+ years of vehicle service life. | Use Scenario: Logging device activation count, sterilization cycles, and operator IDs in portable diagnostic instruments. IC Role / Device Role / Timing Role: Tamper-resistant audit trail storage with hardware write protection (EWEN/EWDS). Use Value: Power-on data protection prevents log corruption during unexpected AC loss or battery swap. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66C-I/P | VCC range 2.5–5.5 V; supports wider supply tolerance and lower-voltage operation | Suitable for mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals) where 93C66C-I/P's 4.5–5.5 V range is too narrow | Select 93LC66C-I/P when system VCC may dip below 4.5 V or operate at 3.3 V; verify ORG and timing compatibility |
| 93AA66C-I/P | VCC range 1.8–5.5 V; ultra-low-voltage capable with identical pinout and instruction set | Enables direct replacement in battery-powered or energy-harvesting devices requiring sub-2.5 V operation | Choose 93AA66C-I/P for portable or low-power designs; note reduced max clock frequency at 1.8 V (1 MHz) |
Compared with 93LC66C-I/P and 93AA66C-I/P, the 93C66C-I/P offers highest noise immunity and robustness in stable 5 V industrial rails but lacks low-voltage flexibility - making it optimal for cost-sensitive, fixed 5 V applications where supply regulation is assured.
Availability
93C66C-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration storage, legacy controller configuration, and automotive body control module settings requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93C66C-I/P 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 Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93C66C-I/P belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for reliable, low-pin-count nonvolatile storage in cost-sensitive industrial and automotive applications where Microwire compatibility and hardware write protection are essential.
FAQ
What is the function of the ORG pin on the 93C66C-I/P?
The ORG pin on the 93C66C-I/P selects memory organization: tied to VCC for 256 × 16-bit mode, or to VSS for 512 × 8-bit mode. It must be statically biased - floating is undefined. This dual-mode capability allows one 93C66C-I/P footprint to serve both 8-bit and 16-bit host interfaces without redesign.
Does the 93C66C-I/P require an external pull-up resistor on the DO pin?
No, the 93C66C-I/P does not require an external pull-up on DO. The DO pin actively drives high/low during Read or Ready/Busy status reporting and enters High-Z when inactive. Pull-ups may cause bus contention if DI and DO are shorted; a series resistor is recommended only in shared-bus configurations.
What is the minimum VCC required for the 93C66C-I/P to operate reliably?
While the 93C66C-I/P is rated for 4.5–5.5 V operation, its internal voltage detector inhibits all functions below 3.8 V (VPOR). Therefore, 3.8 V is the functional lower limit - operation between 3.8 V and 4.5 V is not guaranteed per datasheet, and write cycles may fail or corrupt data.
How does the 93C66C-I/P handle power loss during a write cycle?
The 93C66C-I/P incorporates power-on/off data protection: if VCC drops below 3.8 V during erase/write, the internal logic halts the cycle and preserves existing data. No partial writes occur. After power restoration, the device resumes normal operation with original contents intact - no recovery sequence needed.
Can the 93C66C-I/P be used with modern SPI controllers?
Yes, the 93C66C-I/P is Microwire-compatible and can interface with SPI controllers configured for CPOL = 0, CPHA = 0, and MSB-first transmission. However, it requires manual bit-banging of the start bit and opcode/address fields - true hardware SPI mode (with automatic frame handling) is not supported due to non-standard instruction framing.
93C66C-I/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 2ms
- 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
93C66C-I/P FAQ
1.How can I place an order for 93C66C-I/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66C-I/P 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 93C66C-I/P reliable?
The price and inventory of 93C66C-I/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C66C-I/P is usually 5 days.
3.What payment methods are accepted for 93C66C-I/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66C-I/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66C-I/P?
93C66C-I/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66C-I/P 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 93C66C-I/P?
For technical support, including 93C66C-I/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66C-I/P requirements.
6.How does Aetrix verify that 93C66C-I/P is sourced from the original manufacturer or authorized distributors?
All 93C66C-I/P 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 93C66C-I/P meets industry standards.
7.What is the process for return or replacement of 93C66C-I/P?
All 93C66C-I/P units undergo pre-shipment inspection (PSI). If there is an issue with 93C66C-I/P, 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 93C66C-I/P part is unused and in its original packaging.
Return procedure for 93C66C-I/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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