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Microchip Technology 93LC66CX-I/SN
- Part No.:
- 93LC66CX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66CX-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
93LC66CX-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 256 × 16-bit organization (ORG pin enabled), industrial temperature range (–40°C to +85°C), and 2.5–5.5 V supply. It supports self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93LC66CX-I/SN datasheet, 93LC66CX-I/SN pinout, 93LC66CX-I/SN application, or 93LC66CX-I/SN equivalent, key selection criteria include VCC operating range (2.5–5.5 V), ORG-configurable x16 mode, 6 ms typical write cycle time, 1 million endurance cycles, and SOIC-8 (SN) package compatibility with legacy board layouts.
Technical Context
The 93LC66CX-I/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, requiring a Start bit followed by opcode, address, and data bits clocked on CLK rising edges. Its ORG pin selects between 256 × 16-bit (ORG = VCC) and 512 × 8-bit (ORG = VSS) configurations - confirmed for 'C' variants only.
Internal logic includes auto-erase-before-write, ERAL/WRAL command support, EWEN/EWDS protection, and power-on/off data protection circuitry. Ready/Busy status is actively driven on DO during programming when CS is reasserted after ≥250 ns low time (TCSL), enabling polling-based firmware control without external timers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit with ORG = VCC) |
| VCC range | 2.5 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V systems |
| Write cycle time | 6 ms typical - determines minimum time between successive WRITE commands |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration updates |
| Data retention | 200 years at 25°C - ensures nonvolatile storage integrity over product lifetime |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, no SPI mode bits required |
| Temperature range | –40°C to +85°C (Industrial grade) - validated for extended ambient operation |
Pinout & Package
8-pin SOIC package (SN suffix), 3.9 mm × 4.9 mm body, 1.27 mm pitch. Pin 1 marked by laser dot; pin 1 ID corner matches standard JEDEC SOIC orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can be paused mid-transfer without corruption |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; high-impedance when not selected |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all digital and analog functions; must be low-impedance return path |
| ORG | Organization select | Logic high → 256 × 16-bit; logic low → 512 × 8-bit; must be externally biased |
| NC | No internal connection | Not bonded; electrically floating - no PCB trace or pull-up/down required |
| VCC | Power supply | 2.5–5.5 V input; internal POR triggers at ~1.5 V threshold for data protection |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or firmware delay loops during programming |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial-program corruption |
| EWEN/EWDS protection | Hardware-enforced write lock prevents accidental overwrites during power transitions or noise events |
| Ready/Busy polling via DO | Enables deterministic firmware flow control without fixed delays or interrupt dependency |
| Pb-free & RoHS compliant | Meets global environmental compliance requirements for industrial and consumer manufacturing |
Applications
| Motor Control Configuration | Industrial Sensor Calibration |
|---|---|
Use Scenario: Storing motor commutation tables, PID coefficients, and fault thresholds in BLDC driver modules. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime parameter adjustment. Use Value: Enables field-updatable tuning without firmware reflash; retains settings across 10+ year service life. | Use Scenario: Recording sensor offset/gain trim values during factory calibration of pressure or temperature transducers. IC Role / Device Role / Timing Role: Write-once-per-unit persistent memory holding precision calibration constants. Use Value: Eliminates need for external trim pots or laser trimming; supports automated calibration test fixtures. |
| Medical Device Settings | Smart Energy Metering |
Use Scenario: Saving user preferences, alarm limits, and audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power storage for critical operational parameters with tamper-resistant access control. Use Value: Meets IEC 62304 data integrity requirements; withstands >1M clinical-use cycles. | Use Scenario: Storing tariff schedules, metering history, and communication credentials in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Tamper-evident, long-retention memory for regulatory-compliant energy usage records. Use Value: Guarantees 200-year data retention under elevated temperature/humidity conditions. |
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 (no ORG pin); same VCC range, timing, and package | Fixed x16 mode eliminates external ORG biasing but removes runtime reconfiguration capability | Select when memory word size is invariant and board space allows removal of ORG pull-up/pull-down |
| AT25040B-MAU-10 | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, 5 ms write cycle | Requires additional CS line and SPI-capable MCU peripheral; lacks ERAL/WRAL atomicity | Choose when migrating to SPI-based platforms or needing higher write speed at cost of interface complexity |
Compared with 93LC66B-I/SN, the 93LC66CX-I/SN offers runtime organization flexibility at minor layout cost; versus AT25040B-MAU-10, it provides simpler 3-wire control and guaranteed atomic array operations but requires Microwire-compatible host logic.
Availability
93LC66CX-I/SN is available at Aetrix Electronics and suitable for motor control configuration, industrial sensor calibration, and medical device settings requiring stable component supply across extended product lifecycles.
Supply support for 93LC66CX-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.
The 93LC66CX-I/SN belongs to the 93XX66 serial EEPROM family, designed specifically for low-power, nonvolatile data storage in resource-constrained embedded systems where pin count, voltage flexibility, and long-term reliability are critical.
FAQ
What is the function of the ORG pin on the 93LC66CX-I/SN?
The ORG pin on the 93LC66CX-I/SN selects memory organization: tied to VCC for 256 × 16-bit mode, or to VSS for 512 × 8-bit mode. This pin is functional only on 'C' variants like the 93LC66CX-I/SN - it is NC on A/B versions. External biasing is mandatory; floating ORG causes undefined behavior. The 93LC66CX-I/SN datasheet confirms this configuration applies across its full VCC range (2.5–5.5 V).
Does the 93LC66CX-I/SN support sequential read operations?
Yes, the 93LC66CX-I/SN supports sequential read: when CS remains high after a READ instruction, the internal address counter automatically increments, outputting consecutive memory locations on DO. Each byte or word is delivered on CLK rising edges with TPD ≤ 400 ns (at 1.8 V). This feature reduces host MCU overhead during bulk data retrieval and is explicitly documented in Section 2.7 of the 93LC66CX-I/SN datasheet.
What is the minimum VCC voltage required for reliable operation of the 93LC66CX-I/SN?
The 93LC66CX-I/SN requires VCC ≥ 2.5 V for guaranteed operation across its industrial temperature range. Its internal power-on reset (POR) circuit activates at approximately 1.5 V, inhibiting all operations below that threshold to prevent data corruption. This 2.5 V minimum is specified in the Device Selection Table and confirmed in DC Characteristic D11 (VPOR) of the 93LC66CX-I/SN datasheet.
How does the 93LC66CX-I/SN indicate Ready/Busy status during write cycles?
The 93LC66CX-I/SN drives DO low during active erase/write cycles and high when complete - but only if CS is reasserted high after ≥250 ns low time (TCSL). If CS remains low throughout programming, DO stays in High-Z. This polling mechanism is hardware-verified and detailed in Figures 2-8 and 2-9 of the 93LC66CX-I/SN datasheet, enabling deterministic firmware synchronization without fixed delays.
Is the 93LC66CX-I/SN pin-compatible with other 93XX66 devices in SOIC-8 packaging?
Yes, the 93LC66CX-I/SN shares identical SOIC-8 (SN) pinout and footprint with all 93XX66A/B/C variants in the same package, including 93LC66A-I/SN and 93LC66B-I/SN. Pin assignments (CS, CLK, DI, DO, VSS, ORG/NC, NC/VSS, VCC) match per Table 3-1 and Package Diagrams in the 93LC66CX-I/SN datasheet. However, ORG functionality differs: it is active on the 93LC66CX-I/SN but NC on A/B versions.
93LC66CX-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:
- 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:
- 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
93LC66CX-I/SN FAQ
1.How can I place an order for 93LC66CX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66CX-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 93LC66CX-I/SN reliable?
The price and inventory of 93LC66CX-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 93LC66CX-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC66CX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66CX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66CX-I/SN?
93LC66CX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66CX-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 93LC66CX-I/SN?
For technical support, including 93LC66CX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66CX-I/SN requirements.
6.How does Aetrix verify that 93LC66CX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66CX-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 93LC66CX-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC66CX-I/SN?
All 93LC66CX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66CX-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 93LC66CX-I/SN part is unused and in its original packaging.
Return procedure for 93LC66CX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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