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Microchip Technology 93C66C-I/S15K
- Part No.:
- 93C66C-I/S15K
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
93C66C-I/S15K.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,801
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Product details
Overview
93C66C-I/S15K from Microchip Technology Inc. is a 4 Kbit Microwire-compatible serial EEPROM with ORG-pin-selectable 8-/16-bit word organization, 4.5–5.5 V supply range, and Industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL/WRAL, Ready/Busy status via DO pin, and 1 million erase/write endurance - used in microcontroller-based system configuration storage and calibration data retention.
For engineers reviewing the 93C66C-I/S15K datasheet, 93C66C-I/S15K pinout, 93C66C-I/S15K application, or 93C66C-I/S15K equivalent, key selection criteria include VCC operating range (4.5–5.5 V), ORG-driven word-size flexibility, 2 ms write cycle time, industrial temperature rating, and compatibility with legacy Microwire host controllers requiring CS/CLK/DI/DO timing compliance.
Technical Context
The 93C66C-I/S15K implements a synchronous 3-wire Microwire interface with CS as chip select, CLK for bit-synchronous timing, and shared DI/DO for serial data. Its ORG pin directly configures memory mapping between 512 × 8-bit and 256 × 16-bit organizations - no internal logic translation required.
Write operations are initiated by rising CLK edge on final data bit (93C-series behavior), not CS falling edge. The device asserts Ready/Busy status on DO only when CS is reasserted after ≥250 ns low time (TCSL), and supports sequential read without address retransmission while CS remains high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16 configurable) |
| VCC operating range | 4.5 V to 5.5 V - requires stable regulated supply; POR threshold at 3.8 V |
| Write cycle time | 2 ms - enables fast firmware updates without external timeout management |
| Endurance | 1,000,000 erase/write cycles - supports long-life field calibration logging |
| Data retention | 200 years at 25°C - ensures nonvolatile storage integrity over product lifetime |
| Interface standard | Microwire-compatible 3-wire serial - interoperable with legacy PIC® MCU peripherals |
| Temperature grade | Industrial (–40°C to +85°C) - validated for embedded control environments |
Pinout & Package
93C66C-I/S15K is packaged in an 8-lead SOIC (SOIC-8, package code SN), with lead finish Pb-free Matte Tin per RoHS. 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, and pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates standby mode when deasserted |
| CLK (Pin 2) | Serial Clock | Rising-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL minima vary with VCC |
| DI (Pin 3) | Data Input | Accepts Start bit, opcode, address, and data; shares bus with DO in bidirectional configurations (requires series resistor) |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; decoupling capacitor required near pin |
| ORG (Pin 6) | Organization Select | Logic high → 256 × 16-bit; logic low → 512 × 8-bit; must be statically tied, not floated |
| NC (Pin 7) | No Connection | Internally unconnected; may be left open or grounded per layout best practice |
| VCC (Pin 8) | Power Supply | 4.5–5.5 V input; POR circuit disables writes below 3.8 V; requires local 0.1 µF ceramic bypass |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Hardware-configurable 8-/16-bit interface eliminates software register mapping overhead |
| Self-timed erase/write | 2 ms fixed cycle time (93C-series) removes need for external polling or timer interrupts |
| Auto-ERAL before WRAL | Ensures full array readiness prior to bulk write - prevents partial-write corruption |
| Ready/Busy status on DO | Enables efficient host-side status polling without dedicated interrupt lines or extra pins |
| EWEN/EWDS protection | Prevents accidental writes during power transients or firmware glitches via explicit enable/disable commands |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed at boot; ORG set to 16-bit for compact coefficient pairs. Use Value: 200-year data retention ensures calibration validity across equipment service life without battery backup. | Use Scenario: Holding user-defined I/O mapping and communication protocol settings in PLC modules. IC Role / Device Role / Timing Role: Microwire interface synchronizes with legacy PIC MCU peripherals; CS/CLK timing meets 3 MHz max clock spec. Use Value: 1M endurance supports frequent field reconfiguration without wear-out concerns. |
| Automotive Subsystem Logging | Medical Device Settings Backup |
Use Scenario: Recording fault codes and runtime diagnostics in body control modules (BCM). IC Role / Device Role / Timing Role: Industrial-grade 93C66C-I/S15K operates reliably at –40°C to +85°C; WRAL used for atomic log reset. Use Value: 4.5–5.5 V VCC range matches automotive 5 V rail; ERAL/WRAL prevent partial erase corruption. | Use Scenario: Preserving clinician-adjusted therapy parameters in portable infusion pumps. IC Role / Device Role / Timing Role: EEPROM stores critical safety-critical settings; EWEN/EWDS commands enforce write-protection during normal operation. Use Value: Power-on data protection ensures settings persist through brownout events without loss. |
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/SN | 2.5–5.5 V VCC range; same pinout, ORG function, and instruction set | Supports wider voltage range including 3.3 V systems; lacks 4.5–5.5 V optimized timing | Select for mixed-voltage designs where 3.3 V compatibility is required |
| 93AA66C-I/SN | 1.8–5.5 V VCC range; identical 8/16-bit configurability and SOIC-8 package | Enables ultra-low-power operation down to 1.8 V; higher standby current than 93C66C at 5 V | Select when system VCC may dip below 4.5 V or when extended low-voltage operation is needed |
Compared with 93LC66C-I/SN and 93AA66C-I/SN, the 93C66C-I/S15K offers tighter 4.5–5.5 V timing optimization and lower active write current at 5 V, making it optimal for legacy 5 V industrial controllers where voltage stability is guaranteed.
Availability
93C66C-I/S15K is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive subsystem logging requiring stable component supply and long-term obsolescence support.
Supply support for 93C66C-I/S15K 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 93C66C belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count nonvolatile storage in resource-constrained embedded systems using Microwire or compatible interfaces.
FAQ
What is the function of the ORG pin on the 93C66C-I/S15K?
The ORG pin on the 93C66C-I/S15K selects memory organization: logic high (VCC) configures 256 × 16-bit mode, logic low (VSS) configures 512 × 8-bit mode. It must be statically tied - floating is undefined. This hardware-selectable word size eliminates software address translation and simplifies host driver design for the 93C66C-I/S15K.
Does the 93C66C-I/S15K support 3.3 V operation?
No, the 93C66C-I/S15K does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, with a power-on reset threshold of 3.8 V. For 3.3 V systems, consider the pin-compatible 93LC66C-I/SN (2.5–5.5 V) or 93AA66C-I/SN (1.8–5.5 V), both sharing the same SOIC-8 package and ORG functionality as the 93C66C-I/S15K.
How does the 93C66C-I/S15K indicate Ready/Busy status during write operations?
The 93C66C-I/S15K asserts Ready/Busy status on the DO pin: logic low indicates ongoing erase/write, logic high signals completion. This status is only valid when CS is reasserted high after ≥250 ns low time (TCSL). During active programming, DO remains functional - no separate status pin is required, reducing system pin count for the 93C66C-I/S15K.
What is the maximum clock frequency supported by the 93C66C-I/S15K?
The 93C66C-I/S15K supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V. This is specified in Table 1-2 (A1, FCLK) of the DS21795E datasheet. At lower voltages (not applicable to 93C66C), timing margins relax - but since the 93C66C-I/S15K is rated only for 4.5–5.5 V, 3 MHz is its absolute maximum reliable clock rate for the 93C66C-I/S15K.
Is the 93C66C-I/S15K RoHS compliant and Pb-free?
Yes, the 93C66C-I/S15K is RoHS compliant and Pb-free, with a Matte Tin (Sn) lead finish as confirmed in the "Features" section of DS21795E. All packages listed for the 93C66C family - including the SOIC-8 (SN) variant of the 93C66C-I/S15K - meet JEDEC J-STD-609 Category 1a requirements for lead-free termination.
93C66C-I/S15K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- 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:
- Die
93C66C-I/S15K FAQ
1.How can I place an order for 93C66C-I/S15K through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66C-I/S15K 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/S15K reliable?
The price and inventory of 93C66C-I/S15K 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/S15K is usually 5 days.
3.What payment methods are accepted for 93C66C-I/S15K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66C-I/S15K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66C-I/S15K?
93C66C-I/S15K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66C-I/S15K 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/S15K?
For technical support, including 93C66C-I/S15K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66C-I/S15K requirements.
6.How does Aetrix verify that 93C66C-I/S15K is sourced from the original manufacturer or authorized distributors?
All 93C66C-I/S15K 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/S15K meets industry standards.
7.What is the process for return or replacement of 93C66C-I/S15K?
All 93C66C-I/S15K units undergo pre-shipment inspection (PSI). If there is an issue with 93C66C-I/S15K, 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/S15K part is unused and in its original packaging.
Return procedure for 93C66C-I/S15K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C66C-I/S15K Tags
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