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Microchip Technology 93LC66C-I/SN
- Part No.:
- 93LC66C-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66C-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,195
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Product details
Overview
93LC66C-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with configurable 8-/16-bit word organization via the ORG pin, 2.5–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and Microwire-compatible 3-wire serial interface. It delivers 1 million erase/write cycles and >200 years data retention for nonvolatile storage in microcontroller peripherals and embedded configuration memory.
For engineers reviewing the 93LC66C-I/SN datasheet, 93LC66C-I/SN pinout, 93LC66C-I/SN application, or 93LC66C-I/SN equivalent, key selection considerations include ORG-pin-controlled word size, self-timed erase/write with ERAL/WRAL support, Ready/Busy status signaling on DO, power-on data protection, and compatibility with SOIC-8 (SN) packaging for legacy board designs.
Technical Context
The 93LC66C-I/SN implements a synchronous Microwire-compatible serial interface with CS, CLK, DI, and DO signals plus dedicated ORG input for runtime memory width selection. Its internal architecture includes an address decoder, mode decode logic, and output buffer enabling sequential read, individual erase/write, and full-array operations (ERAL, WRAL).
Operation requires a Start bit (CS high + DI high on first CLK rising edge), followed by opcode, address, and data bits clocked on CLK rising edges. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during programming - low = busy, high = ready - provided CS is reasserted after ≥250 ns low time (TCSL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8 or 256 × 16, selected by ORG pin) |
| VCC Range | 2.5 V to 5.5 V - supports mixed-voltage systems and battery-backed operation |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware or calibration updates |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unpowered storage |
| Write Cycle Time | 6 ms (TWC) - defines minimum interval between write commands |
| Max Clock Frequency | 3 MHz at VCC ≥4.5 V - sets maximum serial throughput for configuration reads/writes |
| Temperature Range | –40°C to +85°C (Industrial grade) - validated for extended ambient operation |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI/DO) - minimal GPIO usage on host MCU |
Pinout & Package
93LC66C-I/SN is packaged in 8-lead SOIC (SN), with lead finish Pb-free (Matte Tin). Pin 1 is CS; pin 2 is CLK; pin 3 is DI; pin 4 is DO; pin 5 is VSS; pin 6 is ORG; pin 7 is NC; pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: asserts device for instruction execution; falling edge initiates self-timed write cycle |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data and clocks out DO data/status |
| DI | Data Input | Receives Start bit, instruction opcodes, addresses, and write data; must be stable before CS activation |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or not reading |
| VSS | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance |
| ORG | Organization Control | Logic high → 256 × 16-bit mode; logic low → 512 × 8-bit mode; must be externally biased |
| NC | No Internal Connection | Unbonded pin; must be left floating or tied to VSS/VCC per layout best practice |
| VCC | Power Supply | 2.5–5.5 V supply; powers internal logic and memory array; includes POR detection at ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Word Size | Runtime-selectable 8-bit or 16-bit organization via external ORG pin biasing - eliminates need for separate part numbers |
| Auto-Erase Before Write | Self-timed erase integrated into each WRITE/WRAL cycle - removes requirement for manual ERASE pre-step |
| Full-Array Erase/Write | ERAL (Erase All) and WRAL (Write All) instructions - enable bulk initialization without host-side address looping |
| Power-On Data Protection | Internal voltage detector disables writes below ~1.5 V - prevents corruption during brown-out or power ramp |
| Ready/Busy Polling | DO pin reflects real-time programming status - allows host to avoid fixed delays and optimize command timing |
| Write Enable/Disable Security | EWEN/EWDS commands require explicit enable before any erase/write - prevents accidental overwrites during noise events |
Applications
| Microcontroller Configuration Storage | Industrial Sensor Calibration Data |
|---|---|
Use Scenario: Storing boot parameters, peripheral settings, and user preferences in PIC® or AVR-based control units. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at startup and during field updates via SPI-like Microwire interface. Use Value: Enables field-upgradable firmware behavior without requiring flash reprogramming or external memory controllers. | Use Scenario: Retaining factory-trimmed offset/gain coefficients and linearization tables for analog sensor modules. IC Role / Device Role / Timing Role: Persistent calibration memory accessed during sensor initialization and periodic recalibration routines. Use Value: Maintains measurement accuracy across power cycles and product lifetime without battery backup. |
| Consumer Electronics Settings Memory | Automotive Subsystem Parameter Storage |
Use Scenario: Saving volume levels, channel presets, and display brightness in audio/video receivers and smart displays. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to application MCU for infrequent but persistent state storage. Use Value: Delivers >200-year data retention and 1M-cycle endurance to support decade-long consumer product lifetimes. | Use Scenario: Holding adaptive learning values (e.g., throttle position offsets, HVAC actuator limits) in body control modules. IC Role / Device Role / Timing Role: Industrial-grade nonvolatile memory operating across –40°C to +85°C ambient with robust ESD immunity. Use Value: Meets AEC-Q100 stress requirements via qualified packaging (SOIC-8) and automotive-temp capable design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-I/SN | Dedicated 256 × 16-bit organization; no ORG pin - fixed word size | Lacks runtime word-size flexibility; simpler biasing but less versatile in mixed-interface systems | Select when 16-bit-only communication is guaranteed and board space permits same SOIC-8 footprint |
| AT25040B-MAHL-T | 4 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock - faster but requires extra CS line | Requires SPI-capable host; incompatible instruction set and timing; no ERAL/WRAL support | Choose for higher throughput needs where SPI is already implemented and Microwire legacy is not required |
Compared with 93LC66B-I/SN, the 93LC66C-I/SN adds ORG-pin configurability at identical package and voltage specs; versus AT25040B-MAHL-T, it trades speed and interface standardization for Microwire compatibility and integrated bulk operations - critical for cost-sensitive, low-pin-count MCU designs.
Availability
93LC66C-I/SN is available at Aetrix Electronics and suitable for industrial control systems, consumer electronics configuration storage, and automotive subsystem parameter retention requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 93LC66C-I/SN 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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC66C belongs to Microchip's legacy 93XX series of Microwire-compatible serial EEPROMs, designed specifically for low-pin-count, low-power nonvolatile storage in resource-constrained embedded systems where simplicity and reliability outweigh high-speed requirements.
FAQ
What is the memory organization of the 93LC66C-I/SN and how is it configured?
The 93LC66C-I/SN provides 4 Kbit of memory in either 512 × 8-bit or 256 × 16-bit organization, selected dynamically by the logic level applied to the ORG pin: ORG = VCC selects x16 mode; ORG = VSS selects x8 mode. This configuration occurs at power-up or reset and remains active until changed. The 93LC66C-I/SN does not auto-detect bus width - external hardware biasing is mandatory for correct operation.
Does the 93LC66C-I/SN require an external erase command before writing data?
No, the 93LC66C-I/SN performs automatic erase prior to each WRITE or WRAL operation - no separate ERASE instruction is needed. The self-timed cycle integrates erase and program phases, completing in 6 ms (TWC) at VCC ≥4.5 V. However, ERAL (Erase All) remains available for full-array initialization, and must be preceded by EWEN if the device is in EWDS mode.
How is Ready/Busy status monitored on the 93LC66C-I/SN?
Ready/Busy status is signaled on the DO pin: DO = low indicates ongoing erase/write; DO = high indicates completion. To read status, CS must be brought high for ≥250 ns after the initial instruction (TCSL), then sampled on subsequent CLK rising edges. Issuing a new Start bit and lowering CS clears the status flag. DO returns to High-Z when CS is low or during non-read operations.
What is the purpose of the EWEN and EWDS commands in the 93LC66C-I/SN instruction set?
EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) provide hardware-level write protection. The 93LC66C-I/SN powers up in EWDS mode, blocking all erase/write operations until EWEN is issued. After successful programming, issuing EWDS restores protection - preventing accidental overwrites due to noise or software faults. READ operations remain fully functional regardless of EWEN/EWDS state.
Can the 93LC66C-I/SN be used in automotive applications requiring extended temperature operation?
The 93LC66C-I/SN is rated for Industrial temperature range (–40°C to +85°C). For Automotive (–40°C to +125°C) operation, Microchip specifies the 93LC66C-E/SN variant - identical functionality and pinout but qualified to AEC-Q100 Grade 2. The 93LC66C-I/SN itself is not qualified for under-hood automotive use; substituting the -E version requires validation of board-level thermal design and voltage margins.
93LC66C-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC66C-I/SN FAQ
1.How can I place an order for 93LC66C-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66C-I/SN 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 93LC66C-I/SN reliable?
The price and inventory of 93LC66C-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66C-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC66C-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66C-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66C-I/SN?
93LC66C-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66C-I/SN 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 93LC66C-I/SN?
For technical support, including 93LC66C-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66C-I/SN requirements.
6.How does Aetrix verify that 93LC66C-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66C-I/SN 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 93LC66C-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC66C-I/SN?
All 93LC66C-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66C-I/SN, 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 93LC66C-I/SN part is unused and in its original packaging.
Return procedure for 93LC66C-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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