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Microchip Technology AT93C66A-10TU-2.7
- Part No.:
- AT93C66A-10TU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT93C66A-10TU-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
AT93C66A-10TU-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, 2 MHz max clock rate at 5V, and self-timed write cycle ≤10 ms. It is used in industrial control panels for parameter storage and calibration retention across power cycles.
For engineers reviewing the AT93C66A-10TU-2.7 datasheet, AT93C66A-10TU-2.7 pinout, AT93C66A-10TU-2.7 application, or AT93C66A-10TU-2.7 equivalent, key selection factors include voltage compatibility (2.7V min), organization flexibility (x8/x16), standby current (6 µA at 2.7V), write endurance (1 million cycles), and TSSOP-8 package footprint.
Technical Context
The AT93C66A-10TU-2.7 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, and EWDS. Its internal logic decodes start bit + op code + address to access memory locations, supporting sequential read without dummy bits between words.
Operation relies on chip-select activation and clock-synchronized data transfer. The ORG pin selects 8-bit or 16-bit word width at power-up, and the DO pin provides Ready/Busy status during write/erase cycles when CS is reasserted after tCS ≥250 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact nonvolatile storage for configuration registers or device IDs |
| Supply Voltage Range | 2.7V to 5.5V - supports direct connection to 3.3V or 5V system rails without level-shifting |
| Max Clock Frequency | 2 MHz at VCC = 5V - allows fast read/write bursts in microcontroller-based systems with minimal timing overhead |
| Write Cycle Time | ≤10 ms (typ. 3 ms) - defines minimum interval between successive write commands; impacts firmware polling or interrupt latency design |
| Endurance | 1 million write cycles - ensures reliable operation over 10+ years in field-updatable embedded devices with daily writes |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of stored calibration or security keys without refresh |
| Standby Current | 6.0 µA max at 2.7V - enables ultra-low-power sleep modes in battery-backed or energy-harvesting applications |
Pinout & Package
AT93C66A-10TU-2.7 is packaged in an 8-lead Thin Shrink Small Outline Package (TSSOP) with 0.65 mm pitch, 3.0 mm body width, and 4.4 mm length - compatible with standard SMT pick-and-place and reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire instruction sequence; determines device readiness for communication |
| SK | Serial Clock | Input clock synchronizing all data transfers; rising edge samples DI, falling edge outputs DO; max 2 MHz at 5V |
| 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 |
| VCC | Power Supply | Primary supply rail (2.7–5.5V); powers internal logic and memory array; decoupling capacitor required |
| GND | Ground | Reference return path for all signals and supply; must be low-impedance to minimize noise coupling |
| ORG | Organization Select | Logic-level input determining memory word width: high = 256×16, low = 512×8; internal 1 MΩ pull-up defaults to x16 |
| NC | No Connect | Unbonded pin; must remain floating; no electrical or thermal function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout via ORG pin - eliminates need for software remapping or external address decoding |
| Self-timed write cycle | No external timing control needed; DO pin indicates completion via Ready/Busy status - simplifies host firmware and reduces interrupt load |
| Three-wire serial interface | Minimal GPIO usage (3 pins + VCC/GND) - ideal for resource-constrained MCUs and space-limited PCBs |
| Low-voltage operation down to 2.7V | Direct compatibility with 3.3V logic families and brown-out tolerant systems - avoids dedicated level shifters |
| High reliability specs | 1M write cycles and 100-year data retention - validated for industrial equipment requiring decades of unattended operation |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-set sensor gain/offset coefficients and user-adjusted trim values in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and runtime; retains values across power loss and firmware updates. Use Value: Eliminates manual recalibration; enables field upgrades without hardware changes; supports traceable calibration logs. | Use Scenario: Saving user preferences (e.g., cooking time, temperature presets, language) in microwave ovens and washing machines. IC Role / Device Role / Timing Role: Persistent settings storage with fast read access during UI initialization; withstands frequent power cycling. Use Value: Delivers consistent user experience; prevents loss of settings during brief outages; meets IEC 60335 safety requirements for data integrity. |
| Medical Device Audit Logs | Automotive Body Control Module |
Use Scenario: Recording timestamped operational events (e.g., door open/close, alarm triggers) in portable diagnostic tools. IC Role / Device Role / Timing Role: Sequential-write log buffer with guaranteed write completion signaling via DO pin. Use Value: Ensures regulatory-compliant event traceability; survives unexpected shutdowns; supports forensic analysis post-failure. | Use Scenario: Storing seat position memory, mirror angle presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to CAN/LIN microcontrollers; retains settings through ignition cycles. Use Value: Enables personalized driver profiles; operates reliably at −40°C to +85°C; meets AEC-Q100 stress test requirements. |
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), 1.8–5.5V, 20 MHz clock, 5 ms write cycle | Requires separate SPI peripheral; higher speed but larger pin count; different instruction set | Select when MCU has dedicated SPI hardware and faster write throughput is critical |
| AT25640B-SSHL-T | 4-kbit SPI interface, 1.8–5.5V, 20 MHz, 5 ms write, SOIC-8 package | Same voltage range and endurance, but SPI protocol increases host software complexity vs. three-wire simplicity | Prefer for legacy designs already using SPI EEPROMs or where pin count permits extra CS line |
Compared with M95640-DW and AT25640B-SSHL-T, the AT93C66A-10TU-2.7 offers lower pin count (3-wire vs. 4-wire), simpler host driver implementation, and identical 2.7V–5.5V operation - making it optimal for GPIO-constrained 8-bit MCUs in cost-sensitive industrial modules.
Availability
AT93C66A-10TU-2.7 is available at Aetrix Electronics and suitable for industrial control panels, consumer appliance UIs, medical diagnostics, and automotive body electronics requiring stable component supply and long-term obsolescence support.
Supply support for AT93C66A-10TU-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 for industrial, automotive, and consumer markets.
The AT93C66A-10TU-2.7 belongs to Microchip's legacy serial EEPROM product line, designed for low-pin-count, low-power, and cost-sensitive embedded systems needing reliable parameter storage without complex interface overhead.
FAQ
What is the maximum clock frequency supported by the AT93C66A-10TU-2.7?
The AT93C66A-10TU-2.7 supports a maximum SK clock frequency of 2 MHz when VCC = 5.0V. At 2.7V–5.5V operation, the AC characteristics specify 1 MHz typical performance, with timing parameters like tSKH/tSKL defined down to 250 ns minimum pulse width. This ensures robust communication with common 8-bit microcontrollers running at standard bus speeds.
How does the ORG pin affect memory organization in the AT93C66A-10TU-2.7?
The ORG pin on the AT93C66A-10TU-2.7 selects between two memory configurations: when tied to VCC, it enables 256 × 16-bit organization; when grounded, it configures 512 × 8-bit layout. An unconnected ORG pin defaults to x16 mode due to an internal 1 MΩ pull-up. This hardware-selectable structure eliminates firmware address translation and simplifies memory mapping in the host system.
Can the AT93C66A-10TU-2.7 operate at 1.8V?
No - the AT93C66A-10TU-2.7 is specifically rated for 2.7V to 5.5V operation, as indicated by the "-2.7" suffix in its part number. For 1.8V–5.5V compatibility, Microchip offers the AT93C66A-10TU-1.8 variant. Using the -2.7 version below 2.7V may result in unreliable read/write behavior or failure to enter programming states.
What is the purpose of the NC pin on the AT93C66A-10TU-2.7?
The NC (No Connect) pin on the AT93C66A-10TU-2.7 is an unconnected, unused terminal with no internal bond wire or circuit connection. It must remain electrically floating and should not be tied to VCC, GND, or any signal. Its presence accommodates package standardization across the AT93CxxA family but serves no functional role in the AT93C66A-10TU-2.7.
Does the AT93C66A-10TU-2.7 support sequential read operations?
Yes - the AT93C66A-10TU-2.7 supports automatic sequential read: after issuing a READ instruction and receiving the first word, holding CS low causes the internal address pointer to increment and output subsequent words continuously on DO, without requiring repeated instructions. This eliminates inter-word delays and improves bulk data retrieval efficiency in configuration loading scenarios.
AT93C66A-10TU-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
AT93C66A-10TU-2.7 FAQ
1.How can I place an order for AT93C66A-10TU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10TU-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-10TU-2.7 reliable?
The price and inventory of AT93C66A-10TU-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-10TU-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10TU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10TU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10TU-2.7?
AT93C66A-10TU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10TU-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-10TU-2.7?
For technical support, including AT93C66A-10TU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10TU-2.7 requirements.
6.How does Aetrix verify that AT93C66A-10TU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10TU-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-10TU-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10TU-2.7?
All AT93C66A-10TU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10TU-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-10TU-2.7 part is unused and in its original packaging.
Return procedure for AT93C66A-10TU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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