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Microchip Technology 93C66C-I/MS
- Part No.:
- 93C66C-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C66C-I/MS.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,105
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Product details
Overview
93C66C-I/MS from Microchip Technology Inc. is a 4 Kbit serial EEPROM with Microwire-compatible 3-wire interface, ORG pin for dynamic 8-/16-bit word size selection, and industrial temperature range (–40°C to +85°C). It delivers 1 million erase/write cycles, >200-year data retention, and operates within 4.5–5.5 V supply. Used in embedded systems for configuration storage, calibration data, and firmware parameter backup.
For engineers reviewing the 93C66C-I/MS datasheet, 93C66C-I/MS pinout, 93C66C-I/MS application, or 93C66C-I/MS equivalent, key selection criteria include VCC range (4.5–5.5 V), ORG-configurable organization, self-timed write/erase timing (2 ms typical), Ready/Busy status via DO pin, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The 93C66C-I/MS implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, plus dedicated ORG pin for runtime memory width selection (8-bit when ORG = VSS, 16-bit when ORG = VCC). Its internal logic includes auto-erase-before-write, ERAL (Erase All), WRAL (Write All), and EWEN/EWDS protection commands.
It supports sequential read, dummy-zero preface on READ, and status polling via DO during programming. Write initiation differs from AA/LC variants: for 93C66C, the rising edge of CLK on the final data bit triggers the self-timed 2 ms erase/write cycle-not the falling edge of CS.
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 logic systems and rejects brown-out below 3.8 V |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no SPI mode bits required |
| Write Cycle Time | 2 ms typical - enables fast field updates without blocking host MCU for extended periods |
| Data Retention | >200 years at 85°C - suitable for long-life industrial equipment with infrequent reprogramming |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration or logging in test instrumentation |
| Temp Range | –40°C to +85°C (Industrial grade) - validated for operation across full commercial/industrial ambient range |
Pinout & Package
8-pin MSOP (Micro Small Outline Package), 3.0 mm × 4.9 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates standby when low during idle |
| CLK | Serial Clock | Rising-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL defined per VCC |
| DI | Data Input | Accepts Start bit, opcode, address, and data; requires pull-down if unused to prevent spurious start detection |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status valid after TSV delay |
| VSS | Ground | Reference for all I/O and internal logic; connects to exposed pad in DFN/TDFN (not applicable to MSOP) |
| ORG | Organization Control | Logic-high → 256×16 mode; logic-low → 512×8 mode; must be externally biased-no internal pull-up/down |
| NC | No Connect | Pin 7 in MSOP is unconnected internally; must be left floating or tied to VSS per layout best practice |
| VCC | Power Supply | 4.5–5.5 V only; POR threshold at 3.8 V prevents corruption during power ramp-up/down |
Key Features
| Feature | Design Value |
|---|---|
| ORG-selectable word size | Enables single BOM for 8-bit microcontrollers (ORG = VSS) and 16-bit controllers (ORG = VCC), reducing inventory complexity |
| Self-timed erase/write | Eliminates need for external timing control or watchdog timeout-host polls DO pin for completion |
| Auto-erase before write | Guarantees bit-level reliability without requiring explicit ERASE command prior to WRITE |
| EWEN/EWDS security | Prevents accidental writes: device powers up in EWDS state; requires explicit EWEN before any programming |
| Ready/Busy status on DO | Allows non-blocking host operation-MCU continues other tasks while waiting for write completion |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and sensor linearization tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at boot and during field recalibration; ORG pin set to match host MCU data bus width. Use Value: Enables one-time calibration at manufacturing and field updates without firmware change-leverages 1M endurance and 200-year retention. | Use Scenario: Holding user-defined settings (display brightness, network IP, alarm thresholds) in medical diagnostic devices. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to an 8-bit MCU via Microwire; CS toggled per command; DO used for status polling. Use Value: Reduces BOM count vs parallel EEPROM; MSOP-8 footprint saves board area in compact enclosures. |
| Automotive Subsystem Logging | Consumer Appliance State Memory |
Use Scenario: Recording fault codes and runtime counters in HVAC control modules operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM with POR lockout at 3.8 V-prevents writes during cold cranking voltage sag. Use Value: Meets automotive environmental requirements without derating; WRAL command allows full memory reset in <15 ms. | Use Scenario: Saving last-used cooking mode, timer values, and child-lock status in microwave ovens after power loss. IC Role / Device Role / Timing Role: Low-power serial memory powered from 5 V rail; standby current ≤5 µA minimizes energy drain in standby mode. Use Value: Eliminates supercapacitor or battery backup; leverages 4.5–5.5 V VCC range matching standard appliance SMPS output. |
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/MS | VCC range 2.5–5.5 V; lower voltage operation enables direct interface with 3.3 V MCUs without level shifters | Better suited for mixed-voltage systems where main logic runs at 3.3 V but legacy peripherals require 5 V | Select 93LC66C-I/MS if system VCC varies below 4.5 V; otherwise 93C66C-I/MS provides tighter 5 V noise margin |
| 93AA66C-I/MS | VCC range 1.8–5.5 V; supports ultra-low-power sleep modes with ICCS ≤1 µA at 1.8 V | Ideal for battery-powered IoT nodes needing EEPROM access during wake cycles without compromising battery life | Choose 93AA66C-I/MS only if sub-2.5 V operation or µA-level standby is mandatory; 93C66C-I/MS offers higher noise immunity at 5 V |
Compared with 93LC66C-I/MS and 93AA66C-I/MS, the 93C66C-I/MS trades wider voltage flexibility for superior 5 V system robustness-its 3.8 V POR threshold and 4.5–5.5 V range make it optimal for legacy 5 V industrial designs where voltage stability is prioritized over low-VDD versatility.
Availability
93C66C-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive subsystem logging requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93C66C-I/MS 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 93Cxx series targets cost-sensitive, low-pin-count nonvolatile memory applications where Microwire simplicity, industrial reliability, and ORG-based flexibility outweigh SPI bandwidth demands.
FAQ
What is the function of the ORG pin on the 93C66C-I/MS?
The ORG pin on the 93C66C-I/MS selects memory organization: tied to VCC for 256 × 16-bit mode, or to VSS for 512 × 8-bit mode. It is not internally pulled and must be externally biased. This pin enables a single 93C66C-I/MS part to serve both 8-bit and 16-bit host interfaces without hardware redesign-critical for flexible BOM management in multi-platform designs.
How does the 93C66C-I/MS handle power-on data protection?
The 93C66C-I/MS incorporates a power-on reset circuit that inhibits all operations when VCC falls below 3.8 V. This prevents partial writes or corrupted reads during power ramp-up or brown-out conditions. The device remains in EWDS (Erase/Write Disable) state until a valid EWEN command is issued, ensuring data integrity even during unstable supply transitions.
What is the maximum clock frequency supported by the 93C66C-I/MS?
The 93C66C-I/MS supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. AC timing parameters-including TCKH (200 ns min), TCKL (100 ns min), and TDIS (50 ns min)-are specified for this voltage range. Operation above 3 MHz is not guaranteed and may result in setup/hold violations or command misinterpretation.
Can the 93C66C-I/MS be used in automotive applications?
The 93C66C-I/MS is rated for Industrial temperature (–40°C to +85°C), not Automotive (–40°C to +125°C). While it may function in some under-hood environments, Microchip specifies the 93C66C-E/MS variant for automotive use. Using 93C66C-I/MS in automotive contexts risks parametric drift or premature failure outside its qualified temperature envelope.
Does the 93C66C-I/MS require external pull-up resistors on its I/O pins?
The 93C66C-I/MS does not require external pull-ups on CS, CLK, or DI for basic operation-but DI must be pulled low when unused to prevent false Start-bit detection. DO is actively driven during READ or status polling and floats to High-Z otherwise; a weak pull-up (~10 kΩ) on DO is recommended only if bus-sharing with other open-drain devices. NC pin (Pin 7) must remain unconnected.
93C66C-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
93C66C-I/MS FAQ
1.How can I place an order for 93C66C-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66C-I/MS 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/MS reliable?
The price and inventory of 93C66C-I/MS 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/MS is usually 5 days.
3.What payment methods are accepted for 93C66C-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66C-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66C-I/MS?
93C66C-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66C-I/MS 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/MS?
For technical support, including 93C66C-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66C-I/MS requirements.
6.How does Aetrix verify that 93C66C-I/MS is sourced from the original manufacturer or authorized distributors?
All 93C66C-I/MS 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/MS meets industry standards.
7.What is the process for return or replacement of 93C66C-I/MS?
All 93C66C-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C66C-I/MS, 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/MS part is unused and in its original packaging.
Return procedure for 93C66C-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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