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Microchip Technology 93C66CT-I/MNY
- Part No.:
- 93C66CT-I/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93C66CT-I/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,258
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Product details
Overview
93C66CT-I/MNY from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, 8-bit organization (no ORG pin), and industrial temperature grade (–40°C to +85°C). It delivers 1 million erase/write cycles, >200 years data retention, and integrated power-on/off data protection - used in embedded system configuration storage and calibration memory.
For engineers reviewing the 93C66CT-I/MNY datasheet, 93C66CT-I/MNY pinout, 93C66CT-I/MNY application, or 93C66CT-I/MNY equivalent, key selection criteria include its fixed 8-bit word size, absence of ORG pin, 2 ms write cycle time, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers requiring minimal firmware changes.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins operating at up to 3 MHz (VCC ≥ 4.5 V), supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal logic enforces automatic erase-before-write and includes dedicated hardware for power-loss protection during programming.
The 93C66CT-I/MNY uses self-timed erase/write cycles with no external timing components required; DO pin provides real-time Ready/Busy feedback during all non-read operations, and the device powers up in EWDS mode to prevent accidental writes - requiring explicit EWEN before any programming sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit organization) |
| VCC range | 4.5 V to 5.5 V - requires stable regulated supply; below 3.8 V disables all programming functions |
| Write cycle time | 2 ms - enables fast field updates without software timeout overhead |
| Endurance | 1,000,000 erase/write cycles - supports long-life industrial logging and calibration |
| Data retention | >200 years at 25°C - ensures firmware parameter integrity over product lifetime |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware |
| Temp range | –40°C to +85°C (Industrial grade) - validated for operation in uncontrolled ambient environments |
Pinout & Package
8-lead MSOP package (MS) with exposed pad; Pb-free Matte Tin finish. Pin 1 marked by laser dot; pin 1 ID corner indicated on top marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands; deselects device into standby but allows ongoing write to complete |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; clock may be paused mid-transfer |
| DI | Data Input | Accepts Start bit, instruction opcodes, address bits, and write data; shares signal path with DO in bidirectional configurations |
| DO | Data Output / Status | Outputs read data and Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read operations |
| VSS | Ground | Reference for all I/O and internal logic; must be connected before VCC during power-up |
| NC | No Connection | Pin 7 is unconnected internally - must be left floating or tied to VSS per layout best practice |
| VCC | Power Supply | 4.5–5.5 V supply; voltage detect threshold at 3.8 V prevents write access during brown-out conditions |
| ORG | Organization Select | Not present on 93C66A/B variants - this part has fixed 8-bit organization; pin 6 is NC |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delay loops - reduces firmware complexity and improves reliability |
| Automatic ERAL before WRAL | Ensures full array readiness before bulk write - prevents partial writes and guarantees atomic configuration updates |
| Power-on/off data protection | Hardware-level lockout below 3.8 V VCC - prevents corruption during power ramp-up/down or supply glitches |
| Ready/Busy status on DO | Enables polling-based synchronization without interrupt lines - simplifies integration with resource-constrained MCUs |
| EWEN/EWDS security protocol | Requires explicit enable before each write session - mitigates risk of spurious writes due to noise or firmware errors |
Applications
| Industrial Sensor Calibration | Legacy MCU Configuration Storage |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in programmable logic controllers and analog front-end modules. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed infrequently during commissioning or recalibration; operates at ≤1 MHz clock rate. Use Value: 1M endurance and >200-year retention ensure calibration data survives decades of field deployment without degradation. | Use Scenario: Holding boot parameters, communication settings, and user preferences in 8-bit microcontroller-based HVAC controllers and motor drives. IC Role / Device Role / Timing Role: Serial configuration store interfaced via GPIO-banged Microwire; accessed during startup and occasional field updates. Use Value: Fixed 8-bit organization eliminates ORG pin routing complexity and reduces PCB footprint versus x16 alternatives. |
| Automotive Body Control Module | Medical Device Setup Memory |
Use Scenario: Retaining seat/mirror position presets and lighting profiles in automotive body control units operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM providing robust nonvolatile storage with hardware write protection against EMI-induced corruption. Use Value: Power-loss protection circuitry prevents data loss during battery disconnect events common in vehicle service scenarios. | Use Scenario: Storing FDA-mandated device initialization parameters and usage logs in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory with EWEN/EWDS command enforcement to meet regulatory traceability requirements. Use Value: 4.5–5.5 V operating range aligns with medical-grade DC-DC outputs, avoiding level-shifting circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66AT-I/MNY | 2.5–5.5 V VCC range; same 8-bit organization and pinout; lower minimum voltage enables wider supply flexibility | Supports battery-powered or mixed-voltage systems where 4.5 V rail is unavailable | Select when system VCC may dip below 4.5 V; verify timing margins at 2.5 V |
| 93AA66AT-I/MNY | 1.8–5.5 V VCC range; identical 8-bit organization; adds deeper low-power standby current (1 µA vs 5 µA) | Optimized for ultra-low-power applications such as energy-harvesting sensors | Choose for battery-operated devices requiring extended shelf life or intermittent wake-up operation |
Compared with 93LC66AT-I/MNY and 93AA66AT-I/MNY, the 93C66CT-I/MNY offers higher noise immunity and tighter VCC regulation tolerance due to its narrower 4.5–5.5 V window - making it preferred in noisy industrial 5 V bus environments where supply stability is assured.
Availability
93C66CT-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, legacy MCU configuration storage, and automotive body control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93C66CT-I/MNY 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, manufacturing, and sales operations.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count serial EEPROM applications in industrial and automotive systems where Microwire compatibility, high endurance, and hardware write protection are essential.
FAQ
What is the memory organization of the 93C66CT-I/MNY?
The 93C66CT-I/MNY is an 8-bit organization device (512 × 8-bit), with no ORG pin - meaning word size is fixed and cannot be configured for 16-bit operation. This differs from 'C' variants like 93C66CT-I/MNY which include the ORG pin; the 'A' suffix confirms fixed x8 architecture per Microchip's device selection table.
Does the 93C66CT-I/MNY require an external pull-up resistor on the DO pin?
No external pull-up is required on the DO pin of the 93C66CT-I/MNY because it actively drives high/low during read and Ready/Busy status reporting. However, if DI and DO are shorted in a bidirectional bus configuration, a series resistor (typically 100–470 Ω) is recommended to prevent bus conflict during the dummy zero phase of read operations.
What is the minimum VCC voltage that permits write operations on the 93C66CT-I/MNY?
The 93C66CT-I/MNY requires VCC ≥ 4.5 V to enable write operations; its internal voltage detector blocks all programming functions below 3.8 V. This ensures reliable erase/write execution and prevents data corruption during brown-out conditions - a hardware-enforced safety feature unique to the 'C' family.
Can the 93C66CT-I/MNY be used with SPI interfaces?
The 93C66CT-I/MNY is Microwire-compatible, not SPI-compatible. While both use 3-wire serial protocols, Microwire requires strict start-bit detection and different opcode framing. Direct connection to standard SPI peripherals will fail unless firmware emulates Microwire timing and instruction format - no hardware SPI mode is supported.
How does the 93C66CT-I/MNY handle power loss during a write cycle?
The 93C66CT-I/MNY incorporates power-on/off data protection circuitry that disables all programming functions when VCC drops below 3.8 V. If power fails mid-write, the internal state machine aborts the operation and retains pre-write data - no partial writes or corruption occurs, ensuring data integrity without external supervision.
93C66CT-I/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
93C66CT-I/MNY FAQ
1.How can I place an order for 93C66CT-I/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66CT-I/MNY 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 93C66CT-I/MNY reliable?
The price and inventory of 93C66CT-I/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C66CT-I/MNY is usually 5 days.
3.What payment methods are accepted for 93C66CT-I/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66CT-I/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66CT-I/MNY?
93C66CT-I/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66CT-I/MNY 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 93C66CT-I/MNY?
For technical support, including 93C66CT-I/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66CT-I/MNY requirements.
6.How does Aetrix verify that 93C66CT-I/MNY is sourced from the original manufacturer or authorized distributors?
All 93C66CT-I/MNY 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 93C66CT-I/MNY meets industry standards.
7.What is the process for return or replacement of 93C66CT-I/MNY?
All 93C66CT-I/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93C66CT-I/MNY, 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 93C66CT-I/MNY part is unused and in its original packaging.
Return procedure for 93C66CT-I/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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