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Microchip Technology AT93C66A-10SI-2.7
- Part No.:
- AT93C66A-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66A-10SI-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,253
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Product details
Overview
AT93C66A-10SI-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, 2.7V–5.5V supply range, and automotive-grade industrial temperature operation (−40°C to +85°C). It delivers 2 MHz clock rate at 5V, self-timed 10 ms max write cycle, and supports sequential read for firmware storage in microcontroller-based systems.
For engineers reviewing the AT93C66A-10SI-2.7 datasheet, AT93C66A-10SI-2.7 pinout, AT93C66A-10SI-2.7 application, or AT93C66A-10SI-2.7 equivalent, key selection considerations include voltage compatibility (2.7V min), 8-lead SOIC package footprint, ORG-pin configurable memory width, READY/BUSY status reporting via DO, and endurance (1 million write cycles) for infrequent configuration updates.
Technical Context
The AT93C66A-10SI-2.7 implements a synchronous 3-wire serial interface (CS/SK/DI/DO) with instruction-set-driven operation including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its internal logic decodes 7-bit opcodes and 8-/9-bit addresses depending on x8/x16 mode, with dummy-bit-prefixed output during READ and status feedback via DO when CS is asserted post-instruction.
Memory organization is dynamically selected by the ORG pin: tied to VCC enables 256 × 16 (4K bits), tied to GND enables 512 × 8 (4K bits); unconnected defaults to x16 via internal 1 MΩ pull-up. The device operates across 1.8V–5.5V (1.8V variant) or 2.7V–5.5V (2.7V variant), with timing parameters fully specified down to 1.8V, and supports extended temperature (−40°C to +125°C) in select packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact nonvolatile storage for calibration data or boot parameters |
| Supply Voltage Range | 2.7V to 5.5V - compatible with 3.3V and 5V logic domains without level shifting |
| Max Clock Frequency | 2 MHz at VCC = 5V - supports fast read access in time-critical initialization sequences |
| Write Cycle Time | 10 ms maximum - defines minimum interval between successive writes; impacts firmware update latency |
| Endurance | 1 million write cycles - ensures reliability over product lifetime in field-programmable applications |
| Data Retention | 100 years - guarantees long-term integrity of stored configuration without refresh |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive control unit environments |
Pinout & Package
AT93C66A-10SI-2.7 is supplied in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide, gull-wing leads, 1.27 mm pitch, body dimensions 4.80–5.00 mm × 3.81–3.99 mm. Pin 1 is marked with a notch or dot; leads are Pb-free and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be low to accept instructions; high state places DO in high-impedance or outputs READY/BUSY |
| SK | Serial Clock | Synchronizes all data transfers; rising edge latches DI, falling edge clocks DO |
| DI | Data Input | Receives start bit, opcode, address, and write data; sampled on SK rising edge |
| DO | Data Output | Outputs read data or READY/BUSY status; high = ready, low = busy during self-timed write |
| VCC | Power Supply | 2.7V–5.5V input; powers internal logic and EEPROM array; requires local 0.1 µF bypass |
| GND | Ground | Reference return path for VCC and I/O signals; must be low-impedance |
| ORG | Organization Select | Configures memory width: VCC = 256 × 16, GND = 512 × 8; unconnected defaults to x16 |
| DC | Don't Connect | No internal connection; must be left floating or tied to GND/VCC per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout eliminates need for software remapping or external logic |
| Self-timed write cycle | Automatic internal timing (max 10 ms) removes requirement for external delay management or polling overhead |
| READY/BUSY status reporting | DO pin asserts logic level indicating write completion - enables deterministic host synchronization without fixed delays |
| Extended temperature grade | Qualified from −40°C to +85°C - suitable for under-hood automotive modules and industrial PLCs |
| Low-power standby current | 6.0–10.0 µA at 2.7V - minimizes quiescent draw in battery-backed or energy-sensitive systems |
Applications
| Motor Control Configuration Storage | Industrial Sensor Calibration Data |
|---|---|
Use Scenario: Storing motor phase alignment offsets and PID tuning constants in BLDC driver modules. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization; read once per boot via 3-wire interface. Use Value: Enables field-updatable motor profiles without requiring reprogramming of main MCU flash; 1M endurance supports factory recalibration. | Use Scenario: Retaining sensor-specific gain/offset coefficients and linearization tables in smart pressure transmitters. IC Role / Device Role / Timing Role: Dedicated calibration memory mapped to MCU's SPI-like peripheral; accessed only during sensor commissioning or diagnostics. Use Value: Decouples calibration data from firmware, allowing sensor replacement without MCU firmware change; 100-year retention ensures lifetime accuracy. |
| Automotive Body Control Module Settings | Medical Device User Preferences |
Use Scenario: Saving seat position memory, mirror angles, and lighting presets in vehicle BCMs. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced to 3.3V microcontroller; written infrequently during user setup, read at power-on. Use Value: Maintains user settings across battery disconnects; 2.7V operation ensures functionality during cranking voltage dips. | Use Scenario: Preserving clinician-adjusted alarm thresholds and display brightness in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store accessed via isolated serial interface during setup mode. Use Value: Meets IEC 62304 data integrity requirements; 1M write cycles support full product lifecycle service recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-DW | 4-Kbit SPI interface (4-wire), 1.8V–5.5V, 20 MHz max clock; no ORG pin - fixed 512 × 8 organization | Lacks hardware-configurable word width; requires SPI master instead of 3-wire logic | Select if system already uses SPI peripherals and higher-speed reads are needed; verify pinout and protocol compatibility |
| STK12C68 | NVSRAM (64K × 8), 3.3V/5V, battery-backed; volatile SRAM + integrated EEPROM backup; no ORG pin | Provides instant-write capability and SRAM-like access speed; larger capacity but higher cost and power | Choose when frequent writes or zero-write-latency is required; not drop-in due to different architecture and backup power needs |
Compared with M95640-DW and STK12C68, AT93C66A-10SI-2.7 offers unique ORG-pin configurability for memory width, minimal 3-wire interface count, and guaranteed 2.7V operation - making it optimal for space-constrained, low-pin-count MCU designs where flexibility in data structure is critical.
Availability
AT93C66A-10SI-2.7 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, medical device configuration storage, and embedded system firmware parameter retention requiring stable component supply and long-lifecycle support.
Supply support for AT93C66A-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 devices, and nonvolatile memory solutions, with a focus on embedded control and connectivity.
The AT93C66A-10SI-2.7 belongs to Microchip's legacy serial EEPROM family designed for reliable, low-power, pin-efficient configuration storage in resource-constrained embedded systems across industrial, automotive, and medical markets.
FAQ
What is the function of the ORG pin on the AT93C66A-10SI-2.7?
The ORG pin on the AT93C66A-10SI-2.7 selects internal memory organization: tied to VCC configures 256 × 16 (x16 mode), tied to GND configures 512 × 8 (x8 mode). When left unconnected, an internal 1 MΩ pull-up defaults to x16 mode. This hardware-selectable width eliminates software configuration overhead and supports flexible data structuring in the AT93C66A-10SI-2.7.
Does the AT93C66A-10SI-2.7 support sequential read operations?
Yes, the AT93C66A-10SI-2.7 supports sequential read: after initiating a READ instruction, holding CS low allows automatic incrementing of the internal address pointer and continuous output of subsequent memory locations on DO. No dummy bit is inserted between words, enabling efficient bulk data retrieval - a core capability of the AT93C66A-10SI-2.7.
What is the maximum clock frequency for the AT93C66A-10SI-2.7 at 3.3V supply?
At VCC = 3.3V, the AT93C66A-10SI-2.7 supports a maximum SK clock frequency of 1 MHz (per AC characteristics table, 2.7V ≤ VCC ≤ 5.5V). This is lower than its 2 MHz rating at 5V but ensures robust timing margin in 3.3V systems - a confirmed specification for the AT93C66A-10SI-2.7.
How does the AT93C66A-10SI-2.7 indicate write completion?
The AT93C66A-10SI-2.7 uses the DO pin to signal readiness: after initiating a WRITE, ERASE, or WRAL instruction, bringing CS high (after ≥250 ns low time) causes DO to output logic '1' when complete (READY) or logic '0' while active (BUSY). This real-time status reporting is intrinsic to the AT93C66A-10SI-2.7's self-timed architecture.
Is the AT93C66A-10SI-2.7 RoHS compliant and halogen-free?
Yes, the AT93C66A-10SI-2.7 is lead-free and halogen-free, as confirmed in the "Automotive Grade, Extended Temperature and Lead-free/Halogen-free Devices Available" feature list and ordering information section. This compliance applies to the -10SI-2.7 variant in JEDEC SOIC packaging and is documented for the AT93C66A-10SI-2.7.
AT93C66A-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
AT93C66A-10SI-2.7 FAQ
1.How can I place an order for AT93C66A-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-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 AT93C66A-10SI-2.7 reliable?
The price and inventory of AT93C66A-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 AT93C66A-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10SI-2.7?
AT93C66A-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-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 AT93C66A-10SI-2.7?
For technical support, including AT93C66A-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10SI-2.7 requirements.
6.How does Aetrix verify that AT93C66A-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-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 AT93C66A-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10SI-2.7?
All AT93C66A-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-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 AT93C66A-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT93C66A-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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