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Microchip Technology AT93C66-10SI-2.7
- Part No.:
- AT93C66-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66-10SI-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,974
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Product details
Overview
AT93C66-10SI-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, 2.7–5.5 V operation, and 10 ms max self-timed write cycle. It supports industrial temperature range (−40°C to +85°C) in 8-lead JEDEC SOIC package and is used for configuration storage in embedded controllers and sensor modules.
For engineers reviewing the AT93C66-10SI-2.7 datasheet, AT93C66-10SI-2.7 pinout, AT93C66-10SI-2.7 application, or AT93C66-10SI-2.7 equivalent, key selection criteria include voltage compatibility (2.7V min), organization flexibility (x8/x16), write endurance (1M cycles), data retention (100 years), and SOIC-8 footprint constraints.
Technical Context
The AT93C66-10SI-2.7 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with start-bit–driven instruction decoding. Memory access is controlled by seven discrete instructions (READ, WRITE, ERASE, EWEN, EWDS, ERAL, WRAL), where address width scales with organization mode (9-bit for x8, 8-bit for x16).
Write operations are self-timed and require prior EWEN activation; status is monitored via DO pin during CS high after instruction initiation. The ORG pin selects internal word width, and DC pin must remain unconnected - no internal pull-up on 2.7V devices per datasheet note.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words) |
| Supply Voltage | 2.7 V to 5.5 V - enables direct interface with 3.3 V and 5 V logic systems without level shifting |
| Interface Type | Three-wire serial (CS, SK, DI/DO) - reduces PCB routing complexity vs. SPI/I²C |
| Max Clock Frequency | 2 MHz at 5 V - supports fast read/write bursts in time-critical boot or calibration sequences |
| Write Cycle Time | 10 ms maximum - defines minimum interval between successive writes; impacts firmware update latency |
| Endurance | 1 million write cycles - ensures reliable field reprogramming over product lifetime |
| Data Retention | 100 years - guarantees nonvolatile storage integrity across extended shelf life and deployment |
Pinout & Package
AT93C66-10SI-2.7 is supplied in an 8-lead JEDEC SOIC package (8S1), 0.150" body width, with standard gull-wing leads and pin 1 indicator notch. Dimensions: 4.80–5.00 mm × 3.81–3.99 mm × 1.35–1.75 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for full instruction duration including address/data transfer |
| SK | Serial Clock | Input clock synchronizing all data transfers; rising edge samples DI, clocks DO output |
| DI | Data Input | Serial input for instructions, addresses, and write data; latched on SK rising edge |
| DO | Data Output | Open-drain serial output for read data and Ready/Busy status; requires external pull-up |
| GND | Ground | Reference return path for VCC and signal levels; must be low-impedance for noise immunity |
| VCC | Power Supply | 2.7–5.5 V supply; decoupling capacitor (0.1 µF) required within 10 mm of pin |
| ORG | Organization Select | Logic-high = 256 × 16 mode; grounded = 512 × 8 mode; not connected = default x16 (not supported on 1.8V variants) |
| DC | Don't Connect | No internal connection; must be left floating - solder mask coverage recommended |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout via ORG pin - eliminates need for software bit-packing in host firmware |
| Self-timed write cycle | No external timing control needed; DO pin provides real-time Ready/Busy feedback during programming - simplifies host polling logic |
| Low-voltage operation | 2.7 V minimum supply enables direct integration into battery-powered or energy-harvesting systems |
| High reliability | 1 million write cycles and 100-year data retention - validated for automotive and industrial deployments requiring long-term firmware/config stability |
| Industrial temperature grade | −40°C to +85°C operating range - qualified for use in motor control, HVAC, and factory automation environments |
Applications
| Motor Control Configuration Storage | Industrial Sensor Calibration Data |
|---|---|
Use Scenario: Storing motor phase alignment offsets, current limit thresholds, and PID tuning parameters in BLDC driver modules. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization and runtime parameter updates. Use Value: Enables field-upgradable motor profiles without hardware redesign; 1M endurance supports >10 years of recalibration cycles. | Use Scenario: Holding factory-trimmed gain/offset coefficients and linearization tables for analog temperature/pressure sensors. IC Role / Device Role / Timing Role: Read-once-at-boot data source; write-only during calibration station programming. Use Value: Eliminates need for precision external resistors; 100-year retention ensures accuracy over equipment service life. |
| Embedded System Bootloader Settings | Smart Meter Firmware Version Tracking |
Use Scenario: Recording bootloader flags (safe mode enable, firmware rollback request) and last-known good image checksum. IC Role / Device Role / Timing Role: Critical state register updated only during firmware update or recovery events. Use Value: Prevents bricking during OTA updates; 10 ms write time allows atomic flag setting within watchdog timeout windows. | Use Scenario: Logging firmware revision IDs, patch timestamps, and cryptographic key version counters in utility meters. IC Role / Device Role / Timing Role: Secure audit trail storage updated once per firmware upgrade cycle. Use Value: Supports regulatory compliance reporting; 2.7 V operation ensures reliable logging during brown-out conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M02-DRMN6TP/K | 2 Mbit SPI interface, 5 V tolerant, 5 MHz clock, 5 ms write cycle | Requires SPI controller instead of generic GPIO bit-banging; higher density but larger footprint (8-lead TSSOP vs SOIC) | Select when migrating to SPI-based platforms or needing >4 kbit capacity |
| AT25DF041A-SH-T | 4 Mbit SPI DataFlash, sector erase, 70 MHz clock, 25 µs page program | Optimized for firmware code storage, not byte-level configuration; requires different command set and erase management | Choose for embedded code shadowing or firmware image storage, not parameter EEPROM replacement |
Compared with M95M02-DRMN6TP/K and AT25DF041A-SH-T, the AT93C66-10SI-2.7 offers simpler three-wire protocol compatibility with legacy microcontrollers lacking SPI peripherals, lower voltage headroom (2.7 V), and proven suitability for infrequent byte-write configuration tasks - making it optimal for cost-sensitive industrial control nodes.
Availability
AT93C66-10SI-2.7 is available at Aetrix Electronics and suitable for motor control configuration storage, industrial sensor calibration data, and embedded system bootloader settings requiring stable component supply across extended production lifecycles.
Supply support for AT93C66-10SI-2.7 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 is a global semiconductor company specializing in microcontrollers, analog components, and nonvolatile memory solutions, with broad industrial and automotive qualification programs.
The AT93C66 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power configuration storage in resource-constrained embedded systems where simplicity and long-term reliability outweigh high-speed throughput needs.
FAQ
What is the maximum clock frequency supported by AT93C66-10SI-2.7?
The AT93C66-10SI-2.7 supports up to 2 MHz SK clock frequency at 5 V operation. At 2.7 V, the maximum clock rate drops to 1 MHz per AC Characteristics Table 4. This directly affects read/write throughput - for example, a full 512-byte read at 2 MHz takes ~8.2 ms excluding overhead. Always verify timing margins using tSKH/tSKL values from the datasheet for your specific VCC and temperature conditions. The AT93C66-10SI-2.7 does not support dynamic clock scaling; fixed-rate operation is required.
How does the ORG pin affect memory organization in AT93C66-10SI-2.7?
The ORG pin on the AT93C66-10SI-2.7 selects between two internal configurations: tied to VCC enables 256 × 16-bit (4096-bit) organization, while grounded enables 512 × 8-bit organization. Leaving ORG unconnected defaults to x16 mode due to internal pull-up - but this behavior is not guaranteed on 1.8 V variants and is explicitly unsupported for AT93C66-10SI-2.7 per datasheet note. The AT93C66-10SI-2.7 instruction set and address width (9-bit for x8, 8-bit for x16) change accordingly, requiring matching host firmware logic.
Is AT93C66-10SI-2.7 compatible with 1.8 V systems?
No, AT93C66-10SI-2.7 is rated for 2.7 V to 5.5 V operation only. It is not electrically or functionally compatible with 1.8 V systems. For 1.8 V applications, Microchip offers the AT93C66-10SI-1.8 variant, which has different DC and AC characteristics - notably lower VIH/VIL thresholds and reduced max clock frequency. Using AT93C66-10SI-2.7 in a 1.8 V design risks unreliable communication, failed writes, or premature device failure. Always match the suffix (-2.7 vs -1.8) to the system's nominal supply voltage.
What is the purpose of the DC pin on AT93C66-10SI-2.7?
The DC (Don't Connect) pin on AT93C66-10SI-2.7 has no internal connection and must remain unconnected - neither tied to VCC nor GND. Solder mask coverage is recommended to prevent accidental shorts. Unlike ORG or other functional pins, DC serves no electrical role; its presence is purely for mechanical symmetry in the SOIC-8 package. Connecting DC may cause undefined behavior or damage. This requirement is explicitly stated in the Pin Configurations table and reinforced in the Functional Description section of the AT93C66-10SI-2.7 datasheet.
Does AT93C66-10SI-2.7 require a separate erase cycle before writing?
No, the AT93C66-10SI-2.7 does not require a separate erase cycle before writing. Each WRITE instruction performs both erase and program operations automatically within the self-timed 10 ms cycle. However, the part must first be placed in Erase/Write Enable (EWEN) state - a prerequisite step that persists until EWDS is issued or power is cycled. Attempting WRITE without prior EWEN results in no action. This architecture simplifies firmware implementation compared to flash memory but mandates strict instruction sequencing. The AT93C66-10SI-2.7 also supports ERASE and ERAL commands for selective or bulk erasure when needed.
AT93C66-10SI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 3-Wire Serial
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66-10SI-2.7 FAQ
1.How can I place an order for AT93C66-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10SI-2.7 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 AT93C66-10SI-2.7 reliable?
The price and inventory of AT93C66-10SI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10SI-2.7?
AT93C66-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10SI-2.7 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 AT93C66-10SI-2.7?
For technical support, including AT93C66-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10SI-2.7 requirements.
6.How does Aetrix verify that AT93C66-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10SI-2.7 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 AT93C66-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66-10SI-2.7?
All AT93C66-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10SI-2.7, 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 AT93C66-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT93C66-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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