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Microchip Technology AT93C66A-10PU-2.7
- Part No.:
- AT93C66A-10PU-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66A-10PU-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,333
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Product details
Overview
AT93C66A-10PU-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, user-selectable organization (512 × 8 or 256 × 16), 2.7–5.5 V supply range, 2 MHz max clock rate at 5 V, and self-timed write cycle ≤10 ms. It supports industrial temperature operation (−40°C to +85°C) and is used in embedded system configuration storage, sensor calibration data retention, and boot parameter storage.
For engineers reviewing the AT93C66A-10PU-2.7 datasheet, AT93C66A-10PU-2.7 pinout, AT93C66A-10PU-2.7 application, or AT93C66A-10PU-2.7 equivalent, key selection criteria include voltage compatibility (2.7V min), organization flexibility via ORG pin, standby current ≤10 µA at 2.7 V, write endurance (1 million cycles), and JEDEC SOIC-8 package compatibility with legacy PCB footprints.
Technical Context
The AT93C66A-10PU-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 architecture supports dual memory organization modes selected by the ORG pin state - high for 256 × 16-bit, low for 512 × 8-bit - enabling flexible byte- or word-oriented access without external logic.
Operation requires Erase/Write Enable (EWEN) before programming; all writes are self-timed with Ready/Busy status reported on DO when CS is asserted post-command. The device features no separate erase-before-write requirement, and supports sequential read with automatic address increment while CS remains active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact nonvolatile storage for firmware flags, calibration coefficients, or device IDs |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V systems without level-shifting |
| Max Clock Frequency | 2 MHz at VCC = 5 V - supports fast configuration reads during system boot |
| Write Cycle Time | ≤10 ms - enables predictable timing budgeting for firmware update routines |
| Endurance & Retention | 1 million write cycles / 100 years data retention - suitable for field-updatable parameters with infrequent writes |
| Standby Current | 6.0–10.0 µA at 2.7 V - critical for battery-backed or energy-harvesting applications |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and automotive body electronics |
Pinout & Package
AT93C66A-10PU-2.7 is packaged in an 8-lead JEDEC SOIC (8S1), 0.150" wide, RoHS-compliant, lead-free plastic gull-wing outline per MS-012 variation AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be held low during instruction execution; controls DO output impedance and Ready/Busy reporting |
| SK | Serial Clock | Synchronous edge-triggered input: rising edge latches DI, falling edge clocks DO; frequency up to 2 MHz at 5 V |
| DI | Data Input | Serial command/data input: accepts Start Bit (1), Op Code, address, and data bits per instruction set |
| DO | Data Output | Open-drain output: delivers read data, dummy bit (0), and Ready/Busy status (1 = ready, 0 = busy) |
| GND | Ground Reference | Return path for VCC and signal currents; must be low-impedance to ensure noise immunity during write cycles |
| VCC | Power Supply | Primary supply rail: powers internal logic and memory array; decoupling capacitor required per datasheet layout guidelines |
| ORG | Organization Select | Logic-level controlled: VCC → 256 × 16 mode; GND → 512 × 8 mode; unconnected defaults to x16 via internal 1 MΩ pull-up |
| NC | No Connect | Internally unused terminal: must remain unconnected on PCB; no routing or thermal tie 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 remapping or external address decoding |
| Self-timed write cycle | Automatic internal timing (≤10 ms) with no external delay or polling overhead - simplifies host firmware implementation |
| Three-wire serial interface | Minimal I/O footprint (3 pins + GND/VCC) - reduces MCU GPIO usage and PCB routing complexity vs. SPI/I²C |
| Erase/Write Enable security | EWEN/EWDS instruction lock prevents accidental overwrites - ensures data integrity during power transitions or noise events |
| Industrial temperature grade | −40°C to +85°C operation - validated for use in motor controllers, HVAC modules, and industrial HMIs without derating |
Applications
| Industrial Sensor Calibration | Embedded System Boot Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed once per power-on reset; read-only during normal operation. Use Value: Eliminates manual calibration per unit; enables field recalibration via host MCU using same 3-wire interface. |
Use Scenario: Holding boot mode selection (e.g., safe mode vs. normal firmware), MAC address, or hardware revision ID in networked edge devices. IC Role / Device Role / Timing Role: Early-boot configuration register accessed within first 100 ms of power-up before main application starts. Use Value: Enables zero-touch deployment and remote firmware recovery without requiring external flash or JTAG access. |
| Consumer Appliance Settings Retention | Automotive Body Control Module |
Use Scenario: Preserving user preferences (temperature setpoints, display brightness) across AC power cycles in smart thermostats and coffee makers. IC Role / Device Role / Timing Role: Infrequent write (≤10×/day), frequent read (on UI interaction); operates at 3.3 V from LDO. Use Value: Achieves <1 µA average current draw in standby - extends battery life in backup-powered units. |
Use Scenario: Storing door lock configuration, mirror position memory, and lighting profiles in 12 V automotive body ECUs. IC Role / Device Role / Timing Role: Powered from vehicle's 5 V rail; withstands load dump transients via internal ESD protection. Use Value: Qualified to AEC-Q100 stress test standards (per Atmel documentation) and supports 100-year data retention under hood temperatures. |
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), 1.8–5.5 V, 20 MHz max clock, 5 ms write cycle | Requires dedicated SPI peripheral; faster throughput but higher pin count and MCU resource usage | Select when system already uses SPI peripherals and requires higher bandwidth than AT93C66A-10PU-2.7's 2 MHz limit |
| AT24C64D-SSHM-T | 64-kbit I²C interface, 1.7–5.5 V, 1 MHz max clock, 5 ms write cycle, 1 million endurance | Two-wire bus sharing capability; supports up to 8 devices on same bus; no ORG pin flexibility | Select when multi-device topology or space-constrained designs favor I²C's two-pin advantage over three-wire simplicity |
Compared with M95640-DW and AT24C64D-SSHM-T, the AT93C66A-10PU-2.7 offers unique ORG-pin organization selection and minimal 3-pin serial interface - ideal for GPIO-limited microcontrollers where SPI/I²C peripherals are unavailable or occupied.
Availability
AT93C66A-10PU-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded boot configuration, and consumer appliance settings retention requiring stable component supply and long-term obsolescence management.
Supply support for AT93C66A-10PU-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 acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for the AT93C66A family.
The AT93C66A series was designed for cost-sensitive, space-constrained embedded systems needing reliable, low-power serial EEPROM with flexible memory mapping - especially where three-wire simplicity outweighs protocol standardization.
FAQ
What is the function of the ORG pin on the AT93C66A-10PU-2.7?
The ORG pin selects internal memory organization: tied to VCC enables 256 × 16-bit mode; tied to GND enables 512 × 8-bit mode. If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This hardware-selectable configuration eliminates software overhead for byte/word alignment in the AT93C66A-10PU-2.7's memory access.
Does the AT93C66A-10PU-2.7 require an external erase cycle before writing?
No. The AT93C66A-10PU-2.7 performs automatic erase during the self-timed write cycle - no separate erase command is needed. However, the Erase/Write Enable (EWEN) instruction must be issued first to unlock programming; subsequent writes proceed directly after data transmission completes.
Can the AT93C66A-10PU-2.7 operate at 1.8 V?
No. The AT93C66A-10PU-2.7 is the 2.7 V minimum variant (suffix -2.7). For 1.8 V operation, the correct part is AT93C66A-10PU-1.8. Using AT93C66A-10PU-2.7 below 2.7 V risks unreliable read/write behavior and violates absolute maximum ratings.
How is Ready/Busy status reported on the AT93C66A-10PU-2.7?
After initiating a write or erase command, asserting CS high (while maintaining SK low for ≥250 ns) causes the DO pin to output Ready/Busy status: logic '1' indicates completion, logic '0' indicates ongoing operation. This allows polling without fixed delays - a key timing feature of the AT93C66A-10PU-2.7 interface.
Is the AT93C66A-10PU-2.7 pin-compatible with the AT93C56A-10PU-2.7?
Yes - both share identical 8-lead JEDEC SOIC (8S1) packaging, pinout, and electrical interface. The AT93C66A-10PU-2.7 provides double the memory (4 kbit vs. 2 kbit) with identical timing, voltage, and instruction set, making it a direct upgrade path where increased storage is required without board redesign.
AT93C66A-10PU-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66A-10PU-2.7 FAQ
1.How can I place an order for AT93C66A-10PU-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10PU-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-10PU-2.7 reliable?
The price and inventory of AT93C66A-10PU-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-10PU-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10PU-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10PU-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10PU-2.7?
AT93C66A-10PU-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10PU-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-10PU-2.7?
For technical support, including AT93C66A-10PU-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10PU-2.7 requirements.
6.How does Aetrix verify that AT93C66A-10PU-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10PU-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-10PU-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10PU-2.7?
All AT93C66A-10PU-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10PU-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-10PU-2.7 part is unused and in its original packaging.
Return procedure for AT93C66A-10PU-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT93C66A-10PU-2.7 Tags
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