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Microchip Technology AT93C66A-10SU-2.7
- Part No.:
- AT93C66A-10SU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66A-10SU-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
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Product details
Overview
AT93C66A-10SU-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, 2.7V–5.5V supply range, and 1 million write cycles endurance. It operates in industrial temperature range (−40°C to +85°C) and is packaged in 8-lead JEDEC SOIC (8S1).
For engineers reviewing the AT93C66A-10SU-2.7 datasheet, AT93C66A-10SU-2.7 pinout, AT93C66A-10SU-2.7 application, or AT93C66A-10SU-2.7 equivalent, key selection criteria include low-voltage operation, self-timed write cycle (≤10 ms), sequential read capability, Ready/Busy status reporting via DO pin, and compatibility with microcontroller SPI-like host interfaces.
Technical Context
The AT93C66A-10SU-2.7 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its internal organization is dynamically selected by the ORG pin voltage level-VCC for 16-bit words or GND for 8-bit words.
Write operations require prior execution of EWEN; all programming modes are disabled by default at power-up. The DO pin serves dual function: data output during READ and Ready/Busy status indicator during write/erase cycles when CS is reasserted after instruction initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact nonvolatile storage for configuration or calibration data |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into 3.3V and 5V systems without level-shifting |
| Max Clock Frequency | 2 MHz at VCC = 5V - enables fast serial access compatible with standard MCU GPIO bit-banging or hardware SPI peripherals |
| Write Cycle Time | ≤10 ms - deterministic self-timed erase/write eliminates need for external timing control or polling overhead |
| Endurance & Retention | 1 million write cycles / 100-year data retention - suitable for field-updatable firmware parameters and infrequent configuration writes |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications including motor control and sensor nodes |
| Interface Protocol | Three-wire serial (CS/SK/DI/DO) - minimal pin count reduces PCB routing complexity versus I²C or quad-SPI devices |
Pinout & Package
AT93C66A-10SU-2.7 is supplied in an 8-lead JEDEC SOIC package (8S1), measuring 4.80–5.00 mm × 5.79–6.20 mm × 1.35–1.75 mm, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire instruction sequence; rising edge initiates command recognition |
| SK | Serial Clock | Synchronous input clock; data sampled on rising edge; max 2 MHz at 5V defines host interface timing budget |
| DI | Data Input | Serial command and address/data input path; accepts Start Bit (1), Op Code, address, and payload bits |
| DO | Data Output / Status | Tri-state serial output during READ; outputs logic '0' (BUSY) or '1' (READY) during write/erase when CS is reasserted |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; requires low-impedance connection to system ground plane |
| VCC | Power Supply | Single 2.7–5.5V supply; no separate VIO required; internal regulation supports stable core operation across voltage range |
| ORG | Organization Select | Logic-high (VCC) selects 256×16 mode; logic-low (GND) selects 512×8 mode; unconnected defaults to x16 via internal pull-up |
| NC | No Connect | Internally unused pin; must remain floating or tied to GND/VCC per layout guidelines - no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 word structure via ORG pin, eliminating firmware dependency for data width adaptation |
| Self-timed write cycle | Internal timing engine completes erase/write in ≤10 ms without host CPU intervention or external wait-state generation |
| Ready/Busy status reporting | DO pin provides real-time BUSY (0)/READY (1) feedback during programming, enabling efficient polling instead of fixed delays |
| Sequential read mode | Continuous data stream across consecutive addresses with no inter-word dummy bits, reducing host read latency by ~12% vs. discrete reads |
| Low standby current | 1.0 µA typical at 1.8V (ISB1) and 10 µA at 5V (ISB3) - critical for battery-powered IoT endpoint retention |
Applications
| Industrial Motor Control | Medical Sensor Calibration |
|---|---|
Use Scenario: Storing motor phase timing offsets, PID coefficients, and fault history logs in variable-speed drives. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and runtime via MCU GPIO bit-banged interface. Use Value: Enables field recalibration without firmware update; 1M endurance supports >10 years of daily parameter adjustments. | Use Scenario: Holding factory-trimmed gain/offset values and patient-specific thresholds in portable ECG monitors. IC Role / Device Role / Timing Role: Configuration memory initialized once at manufacture and read-only during operation except for clinician updates. Use Value: 100-year data retention ensures accuracy over device lifetime; low 1.0 µA ISB1 current extends battery life in standby mode. |
| Automotive Body Controller | Smart Energy Meter |
Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in door modules. IC Role / Device Role / Timing Role: EEPROM interfaced to 8-bit automotive MCU via dedicated three-wire bus isolated from main CAN network. Use Value: −40°C to +85°C rating meets AEC-Q100 Grade 3 requirements; 2.7V min VCC supports operation during cold-crank battery dips. | Use Scenario: Recording tariff schedules, metering constants, and tamper-event timestamps in utility-grade meters. IC Role / Device Role / Timing Role: Secure configuration storage accessed only during firmware upgrade or utility commissioning via isolated UART-to-SPI bridge. Use Value: Write-protection via EWDS prevents accidental corruption; 10 ms max write time allows safe storage during brief AC line interruptions. |
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 (4-wire), 1.8–5.5V, 5ms write cycle, WLCSP package | Higher density but requires SPI peripheral; lacks ORG-pin organization flexibility | Select when migrating to higher-density SPI-based designs with available hardware SPI resources |
| AT25DF041A-SH-B | 4-Mbit SPI DataFlash, 2.7–3.6V only, sector-erase architecture, no ORG pin | Optimized for firmware code storage, not parameter EEPROM use; incompatible voltage range | Choose only for boot-code shadowing in 3.3V systems where sequential byte-access is unnecessary |
Compared with M95M02-DRMN6TP/K and AT25DF041A-SH-B, the AT93C66A-10SU-2.7 offers unique ORG-pin configurability, guaranteed 2.7V operation, and true three-wire simplicity-making it optimal for cost-sensitive, pin-constrained industrial controllers requiring flexible 4-kbit storage.
Availability
AT93C66A-10SU-2.7 is available at Aetrix Electronics and suitable for industrial motor control, medical sensor calibration, automotive body electronics, and smart energy metering requiring stable component supply and long-term obsolescence management.
Supply support for AT93C66A-10SU-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 coverage.
The AT93C66A-10SU-2.7 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power embedded systems needing reliable, easy-to-integrate parameter storage without complex protocol stacks.
FAQ
What is the maximum clock frequency supported by AT93C66A-10SU-2.7?
The AT93C66A-10SU-2.7 supports up to 2 MHz clock frequency at VCC = 5.0V. At lower supply voltages (2.7V–5.5V), the maximum clock rate decreases per AC characteristics table - e.g., 1 MHz at 2.7V. This ensures robust timing margin across its full operating range without requiring dynamic clock scaling in host firmware.
How does the ORG pin affect memory organization in AT93C66A-10SU-2.7?
The ORG pin on AT93C66A-10SU-2.7 selects between two internal configurations: tied to VCC enables 256 × 16-bit organization (256 words × 16 bits), while tied to GND enables 512 × 8-bit organization (512 words × 8 bits). If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode - allowing hardware flexibility without board redesign.
Does AT93C66A-10SU-2.7 require a separate erase cycle before writing?
No, the AT93C66A-10SU-2.7 does not require a separate erase cycle before writing. Each WRITE instruction automatically erases the target location prior to programming, and the entire process is self-timed within the 10 ms maximum write cycle. Erase-only (ERASE) and bulk (ERAL) commands are optional for diagnostic or initialization purposes.
What is the purpose of the NC pin on AT93C66A-10SU-2.7?
The NC (No Connect) pin on AT93C66A-10SU-2.7 is internally unconnected and serves no electrical function. It must be left floating or optionally tied to GND/VCC for mechanical stability - but never driven by external circuitry. This pin exists solely for package symmetry and does not impact device operation or timing.
Can AT93C66A-10SU-2.7 be used in automotive applications?
The AT93C66A-10SU-2.7 is rated for industrial temperature (−40°C to +85°C) and is not officially qualified to AEC-Q100 standards. While it may function in some automotive body-control modules, Microchip documentation explicitly states their products are "not intended, authorized, or warranted for use in automotive applications." For automotive use, consider AEC-Q100-qualified alternatives like the 24AA02E48.
AT93C66A-10SU-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:
- 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
AT93C66A-10SU-2.7 FAQ
1.How can I place an order for AT93C66A-10SU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10SU-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 AT93C66A-10SU-2.7 reliable?
The price and inventory of AT93C66A-10SU-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 AT93C66A-10SU-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10SU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10SU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10SU-2.7?
AT93C66A-10SU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10SU-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 AT93C66A-10SU-2.7?
For technical support, including AT93C66A-10SU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10SU-2.7 requirements.
6.How does Aetrix verify that AT93C66A-10SU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10SU-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 AT93C66A-10SU-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10SU-2.7?
All AT93C66A-10SU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10SU-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 AT93C66A-10SU-2.7 part is unused and in its original packaging.
Return procedure for AT93C66A-10SU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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