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Microchip Technology AT93C66-10SI-2.5
- Part No.:
- AT93C66-10SI-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66-10SI-2.5.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,706
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Product details
Overview
AT93C66-10SI-2.5 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, user-selectable 512 × 8 or 256 × 16 organization, 2.5V–5.5V supply range, 10 ms max write cycle time, and industrial temperature rating (−40°C to +85°C). It serves as nonvolatile configuration storage in embedded controllers, sensor modules, and power management ICs requiring low-voltage operation.
For engineers reviewing the AT93C66-10SI-2.5 datasheet, AT93C66-10SI-2.5 pinout, AT93C66-10SI-2.5 application, or AT93C66-10SI-2.5 equivalent, key selection criteria include VCC min support (2.5 V), self-timed write endurance (1 million cycles), SOIC-8 package compatibility, and ORG-pin configurable memory width for flexible data alignment.
Technical Context
The AT93C66-10SI-2.5 implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, and EWDS. Its internal logic decodes 9-bit addresses (A8–A0) for 4K-bit capacity and supports dual-word-width access via the ORG pin.
Write operations are self-timed with no external erase step required; READY/BUSY status is reported on DO when CS is asserted post-instruction. The device uses internal pull-up on ORG (≈1 MΩ) to default to x16 mode if unconnected - a feature confirmed absent only in 1.8V variants, not applicable here.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 organization) |
| Supply Voltage Range | 2.5 V to 5.5 V - enables direct interfacing with 2.5V/3.3V microcontrollers without level shifting |
| Max Clock Frequency | 500 kHz at 2.5V - sets maximum serial throughput for configuration reads/writes |
| Write Cycle Time | 10 ms maximum - defines worst-case latency for nonvolatile parameter updates |
| Endurance | 1 million write cycles - supports frequent calibration or logging use cases over product lifetime |
| Data Retention | 100 years at 25°C - ensures long-term reliability of stored calibration, serial numbers, or security keys |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood applications |
Pinout & Package
AT93C66-10SI-2.5 is supplied in an 8-lead JEDEC-standard SOIC package (8S1), 0.150" wide, with gull-wing leads and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; determines READY/BUSY visibility on DO |
| SK | Serial Clock | Synchronizes all data transfers; rising edge latches DI, samples DO; timing constraints scale with VCC |
| DI | Data Input | Receives start bit, op code, address, and write data; high-impedance when not selected |
| DO | Data Output | Drives read data or READY/BUSY status; tri-states when CS is high or during write cycle |
| GND | Ground Reference | Return path for VCC and signal currents; must be low-impedance for noise immunity |
| VCC | Power Supply | 2.5V–5.5V input; bypass capacitor (0.1 µF) recommended near pin for stable operation |
| ORG | Organization Select | High = 256 × 16 mode; low = 512 × 8 mode; open = internal pull-up selects x16 (confirmed for 2.5V variant) |
| DC | No Connect | Internally unused; must be left floating or tied to GND/VCC per layout best practice - no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout via ORG pin - eliminates firmware rework when data width changes |
| Self-timed write cycle | No external timing control needed; DO reports BUSY/READY status - simplifies host controller software |
| Low-voltage operation down to 2.5V | Validated operation across full 2.5V–5.5V range - supports mixed-voltage systems and battery-backed designs |
| Industrial temperature grade | −40°C to +85°C operation - meets extended environmental requirements for factory automation and telecom equipment |
| ESD protection >4 kV | HBM-rated robustness - reduces need for external protection in board-level ESD-prone environments |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated gain/offset coefficients and linearization tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during power-up initialization and runtime correction. Use Value: Enables plug-and-play sensor replacement with zero recalibration; 100-year retention preserves accuracy across product lifecycle. |
Use Scenario: Holding boot-time configuration flags, communication protocol settings, and I/O mapping for microcontroller-based motor drives. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to MCU GPIOs using minimal 3-wire footprint. Use Value: Reduces BOM count vs parallel EEPROM; 2.5V compatibility allows shared VCC rail with low-power MCUs. |
| Power Management Unit (PMU) Settings | Network Equipment Identity Storage |
|
Use Scenario: Saving dynamic voltage/frequency scaling (DVFS) profiles and fault log history in DC-DC controller modules. IC Role / Device Role / Timing Role: Write-once-per-event storage for operational parameters updated infrequently but critical for recovery. Use Value: 1M write endurance supports >10 years of daily profile updates; self-timed writes prevent MCU timing conflicts. |
Use Scenario: Storing MAC address, serial number, and regulatory certification data in Ethernet switches and PoE injectors. IC Role / Device Role / Timing Role: Secure, tamper-resistant identity register accessed during network stack initialization. Use Value: SOIC-8 package fits tight PCB spaces; 2.5V–5.5V range matches common 3.3V system rails without regulator overhead. |
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), 2.5V–5.5V, 20 MHz max clock, 5 ms write cycle | Requires dedicated SPI peripheral; faster clock but higher pin count; no ORG pin flexibility | Select when host has SPI hardware and requires higher throughput; not drop-in due to interface and pinout mismatch |
| CAT93C66VI-GT3 | 4-Kbit 3-wire EEPROM, 2.5V–5.5V, 500 kHz max clock, 10 ms write cycle, same SOIC-8 package | Identical pinout and instruction set; minor AC timing variations; Catapult (onsemi) second-source | Direct functional replacement with validated compatibility in existing AT93C66 layouts and firmware |
Compared with AT93C66-10SI-2.5, M95640-WMN6TP offers higher speed but demands SPI resources and layout changes, while CAT93C66VI-GT3 provides seamless migration with identical timing, pinout, and command structure - ideal for supply chain diversification without redesign.
Availability
AT93C66-10SI-2.5 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and power management unit settings requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AT93C66-10SI-2.5 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 technical and manufacturing continuity for the AT93Cxx EEPROM family.
The AT93C66 is part of Microchip's legacy serial EEPROM portfolio designed for cost-sensitive, space-constrained applications needing reliable nonvolatile storage with minimal interface overhead.
FAQ
What is the minimum operating voltage for AT93C66-10SI-2.5?
The AT93C66-10SI-2.5 is rated for operation from 2.5 V to 5.5 V. Its guaranteed functionality at 2.5 V - confirmed in the DC Characteristics table (VCC2 parameter) - makes it suitable for direct integration with 2.5V logic families and battery-powered systems where voltage headroom is constrained. Below 2.5 V, timing and write reliability are not assured.
Does AT93C66-10SI-2.5 support both 8-bit and 16-bit data organization?
Yes, AT93C66-10SI-2.5 supports user-selectable organization: 512 × 8 (byte-wide) or 256 × 16 (word-wide), controlled by the ORG pin. When ORG is high (or left open, relying on internal ~1 MΩ pull-up), the x16 mode is active; when grounded, x8 mode is selected. This dual-mode capability is explicitly documented for the AT93C66 family and applies to the -2.5V variant.
Is the AT93C66-10SI-2.5 pin-compatible with other AT93Cxx devices in SOIC-8?
AT93C66-10SI-2.5 shares identical pinout and package (8S1 SOIC) with AT93C46, AT93C56, and AT93C57 in the same suffix variant (e.g., -10SI-2.5). However, memory size and address depth differ: AT93C66 uses 9-bit addressing (A8–A0), while AT93C56 uses 8-bit (A7–A0). Firmware must account for address width - physical pin compatibility does not guarantee functional interchangeability.
What is the maximum clock frequency supported by AT93C66-10SI-2.5 at 2.5V?
At VCC = 2.5 V, the AT93C66-10SI-2.5 supports a maximum SK clock frequency of 500 kHz, as specified in the AC Characteristics table under "fSK" for the 2.5V ≤ VCC ≤ 5.5V condition. This limit ensures setup/hold timing margins (e.g., tDIS = 200 ns, tSKH = 500 ns) are met across temperature and process variation.
How is write protection implemented on AT93C66-10SI-2.5?
AT93C66-10SI-2.5 uses instruction-based write protection: programming (WRITE, ERASE, WRAL, ERAL) is disabled by default after power-up. An EWEN (Erase/Write Enable) instruction must be issued first; subsequent EWDS (Erase/Write Disable) restores protection. No hardware write-protect pin exists - security relies entirely on correct instruction sequencing and firmware discipline.
AT93C66-10SI-2.5 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66-10SI-2.5 FAQ
1.How can I place an order for AT93C66-10SI-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10SI-2.5 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 AT93C66-10SI-2.5 reliable?
The price and inventory of AT93C66-10SI-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66-10SI-2.5 is usually 5 days.
3.What payment methods are accepted for AT93C66-10SI-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10SI-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10SI-2.5?
AT93C66-10SI-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10SI-2.5 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 AT93C66-10SI-2.5?
For technical support, including AT93C66-10SI-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10SI-2.5 requirements.
6.How does Aetrix verify that AT93C66-10SI-2.5 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10SI-2.5 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 AT93C66-10SI-2.5 meets industry standards.
7.What is the process for return or replacement of AT93C66-10SI-2.5?
All AT93C66-10SI-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10SI-2.5, 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 AT93C66-10SI-2.5 part is unused and in its original packaging.
Return procedure for AT93C66-10SI-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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