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Microchip Technology AT93C66-10PC
- Part No.:
- AT93C66-10PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66-10PC.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,234
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Product details
Overview
AT93C66-10PC 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 10 ms max self-timed write cycle. It delivers high reliability for configuration storage in industrial control panels requiring nonvolatile memory with low-voltage operation.
For engineers reviewing the AT93C66-10PC datasheet, AT93C66-10PC pinout, AT93C66-10PC application, or AT93C66-10PC equivalent, key selection criteria include voltage compatibility (2.7–5.5 V), 4K-bit density with dual-word-width flexibility, 8-pin PDIP package, and guaranteed 1 million write cycles with 100-year data retention.
Technical Context
The AT93C66-10PC implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its internal logic decodes 9-bit addresses (A8–A0) for 4K-bit capacity and supports both x8 and x16 organization modes selected by the ORG pin state.
Write operations require explicit Erase/Write Enable (EWEN) before programming and return READY/BUSY status on DO when CS is raised during tWP. The device operates across commercial temperature range (0°C to +70°C) and features ESD protection >4000 V, ensuring robustness in board-level integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 organization) |
| Supply Voltage Range | 2.7 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V microcontrollers without level shifting |
| Max Clock Frequency | 1 MHz at 2.7 V - defines maximum serial data throughput for configuration reads/writes |
| Write Cycle Time | 10 ms maximum - determines minimum time between successive write commands |
| Endurance | 1 million write cycles - supports frequent field updates in calibration or logging applications |
| Data Retention | 100 years - ensures long-term validity of stored settings without refresh |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems |
Pinout & Package
AT93C66-10PC is housed in an 8-pin PDIP (package code 8P3), 0.300" wide, with standard through-hole mounting. Pin 1 is marked by notch or dot; pinout follows JEDEC MS-001 BA standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: device responds only when CS is low; used to daisy-chain multiple serial EEPROMs |
| SK | Serial Clock | Synchronizes all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Receives instruction opcodes, addresses, and write data; latched on SK rising edge |
| DO | Data Output | Drives read data, READY/BUSY status, or high-impedance when CS high |
| VCC | Power Supply | Primary power input; must be stable within 2.7–5.5 V for valid operation |
| GND | Ground | Reference return path for all signals and power; requires low-impedance connection |
| ORG | Organization Select | High = 256 × 16 mode; low = 512 × 8 mode; unconnected defaults to x16 via internal pull-up |
| DC | Don't Connect | No internal connection; must remain 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 via ORG pin - eliminates firmware rework when memory width requirements change |
| Low-voltage operation down to 2.7 V | Guaranteed functionality at 2.7 V supply - supports battery-backed or energy-harvesting systems without voltage boosters |
| Self-timed write cycle | No external timing control needed; DO pin reports READY/BUSY status - simplifies host software and removes need for fixed delays |
| High-reliability nonvolatile storage | 1M write cycles and 100-year data retention - suitable for infrequently updated but mission-critical configuration data |
| ESD protection >4000 V | HBM-rated robustness - reduces risk of damage during handling or system-level ESD events |
Applications
| Industrial Sensor Calibration | Consumer Remote Control ID Storage |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in HVAC temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization. Use Value: Enables plug-and-play replacement without recalibration; 100-year retention prevents drift-related field failures. |
Use Scenario: Holding unique IR code sets and button mapping profiles in universal remote controls. IC Role / Device Role / Timing Role: Serial configuration store loaded once at manufacturing and rarely rewritten. Use Value: Dual x8/x16 organization allows flexible encoding of 8-bit command sets or compact 16-bit extended protocols. |
| Embedded System Boot Configuration | Medical Device Parameter Backup |
Use Scenario: Saving boot-mode selection (e.g., safe mode vs. normal mode) and peripheral enable flags in network routers. IC Role / Device Role / Timing Role: Early-boot configuration source read before main processor initializes flash or DRAM. Use Value: 2.7 V operation ensures reliable read during brown-out conditions where main supply dips below 3.0 V. |
Use Scenario: Backing up user-adjusted therapy parameters (e.g., infusion rate, alarm thresholds) in portable insulin pumps. IC Role / Device Role / Timing Role: Fail-safe parameter vault written only after confirmation and verified on power-up. Use Value: 1 million endurance cycles support daily parameter adjustments over 10+ years of clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-WMN6TP | 4 Kbit SPI interface (4-wire), 2.5–5.5 V, 20 MHz clock, 5 ms write cycle | Requires separate SPI master; faster throughput but higher pin count and protocol overhead | Choose for systems already using SPI peripherals and needing higher speed than 3-wire allows |
| CAT93C66VI-GT3 | 4 Kbit 3-wire interface, 1.8–5.5 V, 10 ms write cycle, same pinout and instruction set as AT93C66 | Extended 1.8 V support and AEC-Q100 qualification for automotive use | Choose when operating below 2.7 V or requiring automotive-grade qualification and traceability |
Compared with M95640-WMN6TP and CAT93C66VI-GT3, the AT93C66-10PC offers identical 3-wire simplicity and pin compatibility with legacy Atmel designs, while providing optimal cost and footprint for commercial industrial applications where 2.7 V minimum supply suffices.
Availability
AT93C66-10PC is available at Aetrix Electronics and suitable for industrial control panels, consumer electronics configuration storage, and embedded boot configuration requiring stable component supply and long-lifecycle support.
Supply support for AT93C66-10PC 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 AT93C series.
The AT93C66 belongs to Microchip's legacy serial EEPROM product line, designed specifically for space-constrained, low-power embedded systems requiring simple 3-wire nonvolatile storage with hardware-configurable memory width.
FAQ
What is the memory organization of AT93C66-10PC?
The AT93C66-10PC provides 4096 bits organized as either 512 words × 8 bits or 256 words × 16 bits. The ORG pin selects mode: high (or open) configures x16, low configures x8. This hardware-selectable layout avoids firmware changes when memory width requirements evolve across product variants.
Does AT93C66-10PC support 1.8 V operation?
No, AT93C66-10PC is rated for 2.7 V to 5.5 V operation only. The -1.8 suffix (e.g., AT93C66-10PC-1.8) denotes a different variant. Using AT93C66-10PC below 2.7 V may result in unreliable read/write behavior or failure to enter programming states like EWEN.
How does the AT93C66-10PC indicate write completion?
The AT93C66-10PC outputs READY/BUSY status on the DO pin: a logic '1' indicates completion and readiness for next command; a logic '0' means write is still in progress. This status is valid only if CS is raised after tCS (≥250 ns) but before tWP ends (≤10 ms).
Is AT93C66-10PC pin-compatible with AT93C46 or AT93C56?
Yes, AT93C66-10PC shares identical 8-pin PDIP pinout and 3-wire interface signals (CS, SK, DI, DO, VCC, GND, ORG, DC) with AT93C46 and AT93C56. However, address width differs (7-bit for AT93C46, 8-bit for AT93C56, 9-bit for AT93C66), so firmware must validate instruction length and address decoding.
What is the purpose of the DC pin on AT93C66-10PC?
The DC (Don't Connect) pin on AT93C66-10PC has no internal connection and must remain unconnected. It exists for mechanical symmetry and package compatibility - tying it to VCC or GND risks unintended current paths or noise coupling, violating the device's absolute maximum ratings.
AT93C66-10PC 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66-10PC FAQ
1.How can I place an order for AT93C66-10PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10PC 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 AT93C66-10PC reliable?
The price and inventory of AT93C66-10PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66-10PC is usually 5 days.
3.What payment methods are accepted for AT93C66-10PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10PC?
AT93C66-10PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10PC 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 AT93C66-10PC?
For technical support, including AT93C66-10PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10PC requirements.
6.How does Aetrix verify that AT93C66-10PC is sourced from the original manufacturer or authorized distributors?
All AT93C66-10PC 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 AT93C66-10PC meets industry standards.
7.What is the process for return or replacement of AT93C66-10PC?
All AT93C66-10PC units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10PC, 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 AT93C66-10PC part is unused and in its original packaging.
Return procedure for AT93C66-10PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT93C66-10PC Tags
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AT24C02C-XHM-T
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