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Microchip Technology 93AA66CT-I/MC
- Part No.:
- 93AA66CT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93AA66CT-I/MC.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,389
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Product details
Overview
93AA66CT-I/MC from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and configurable 8-/16-bit word organization via the ORG pin. It delivers 1 million erase/write cycles, >200-year data retention, and industrial-grade operation from –40°C to +85°C in an 8-lead 2x3 DFN package. Used for parameter storage in embedded controllers and sensor calibration.
For engineers reviewing the 93AA66CT-I/MC datasheet, 93AA66CT-I/MC pinout, 93AA66CT-I/MC application, or 93AA66CT-I/MC equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), ORG-pin-configurable word size, self-timed write/erase with Ready/Busy signaling, industrial temperature rating, and DFN package footprint constraints.
Technical Context
The 93AA66CT-I/MC implements a synchronous serial Microwire interface with CS, CLK, DI, and DO lines plus dedicated ORG pin for runtime memory organization selection. It supports both x8 (ORG = VSS) and x16 (ORG = VCC) modes, enabling flexible data bus alignment without hardware redesign.
Its internal architecture includes auto-erase-before-write, ERAL (Erase All), WRAL (Write All), EWEN/EWDS protection logic, and power-on/off data protection circuitry. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during programming cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit or 256 × 16-bit, selectable via ORG pin) |
| VCC Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in telemetry or configuration logging |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unattended industrial deployments |
| Interface | 3-wire Microwire-compatible serial (CS, CLK, DI/DO) - minimal GPIO usage, compatible with legacy MCU peripherals |
| Temp Range | –40°C to +85°C (Industrial grade) - validated for use in factory automation and outdoor metering |
| Write Cycle Time | 6 ms typical (TWC) - deterministic timing for real-time firmware coordination |
Pinout & Package
8-lead 2x3 DFN package (MC suffix), exposed pad (may be connected to VSS or left floating), RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge (93AA/93LC) |
| 2 - CLK | Serial Clock | Synchronizes all data transfers; rising-edge sampling of DI and DO; stoppable mid-sequence |
| 3 - DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; may share trace with DO if series resistor used |
| 4 - DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall; requires TCSL before status polling |
| 5 - NC | No Internal Connection | Not bonded; must be left unconnected or tied to VSS per layout best practice |
| 6 - ORG | Organization Control | Logic high → 256×16-bit mode; logic low → 512×8-bit mode; must be statically biased |
| 7 - VSS | Ground | Reference for all I/O and internal logic; connect exposed pad to VSS for thermal and EMI performance |
| 8 - VCC | Power Supply | 1.8–5.5 V input; internal POR triggers at ~1.5 V; powers internal charge pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| ORG Pin Configuration | Hardware-selectable 8-bit or 16-bit word organization eliminates need for software rework across product variants |
| Self-Timed Erase/Write | Internal timing eliminates external delay loops; DO pin provides precise Ready/Busy feedback for deterministic host control |
| Auto-Erase-Before-Write | Guarantees data integrity without requiring explicit ERASE command prior to WRITE - simplifies firmware logic |
| EWEN/EWDS Protection | Prevents accidental writes during power transients or noise events; device powers up in locked (EWDS) state |
| Power-On/Off Data Protection | Hardware-level inhibition below 1.5 V VCC prevents corruption during brown-out or hot-plug scenarios |
Applications
| Industrial Sensor Calibration | Embedded Controller Parameter Storage |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables in pressure or temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization and field recalibration. Use Value: Enables single-hardware design across multiple sensor ranges; eliminates laser trimming cost and supports post-deployment calibration updates. | Use Scenario: Holding user-configurable settings (baud rate, I/O mapping, alarm thresholds) in PLC modules and motor drives. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to MCU's Microwire peripheral during boot and runtime. Use Value: Reduces BOM count by replacing discrete trim pots and jumpers; supports remote firmware update persistence. |
| Medical Device Safety Logs | Automotive Body Control Module Settings |
Use Scenario: Recording diagnostic timestamps, fault counters, and last-known-safe states in portable infusion pumps and monitors. IC Role / Device Role / Timing Role: Tamper-resistant event logger with guaranteed write completion signaling via DO pin. Use Value: Meets IEC 62304 data integrity requirements; 1M-cycle endurance supports lifetime logging without wear leveling. | Use Scenario: Storing seat/mirror position presets, lighting profiles, and door lock behavior in automotive BCMs. IC Role / Device Role / Timing Role: Low-power configuration store accessed over LIN or CAN gateway MCU's SPI-compatible interface. Use Value: Operates reliably across full automotive cold-crank profile (down to 1.8 V); DFN package saves PCB area in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66CT-I/MC | Same 4 Kbit capacity and DFN package, but 2.5–5.5 V VCC range and POR at 2.5 V; no change in pinout or instruction set | Requires minimum 2.5 V supply - unsuitable for 1.8 V systems; otherwise drop-in replacement where voltage allows | Select when system operates ≥2.5 V and higher immunity to low-VCC glitches is needed. |
| AT25040B-MAHL-T | 4 Kbit SPI EEPROM (not Microwire), 1.8–5.5 V, SOIC-8 package; lacks ORG pin and x16 mode; uses standard SPI opcodes | Requires SPI interface instead of Microwire; no hardware word-size selection; different timing and command structure | Choose only when migrating to SPI-based platforms or when ORG flexibility is unnecessary and SOIC-8 is preferred. |
Compared with 93LC66CT-I/MC, the 93AA66CT-I/MC supports lower-voltage operation (1.8 V vs. 2.5 V) critical for battery-powered devices, while the AT25040B-MAHL-T offers SPI compatibility at the cost of losing ORG-based word-size agility and Microwire legacy support.
Availability
93AA66CT-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller parameter storage, medical device safety logs, and automotive body control module settings requiring stable component supply across extended product lifecycles.
Supply support for 93AA66CT-I/MC 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 Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving industrial, automotive, and consumer markets globally.
The 93XX66 family was designed specifically for low-power, nonvolatile memory applications in resource-constrained embedded systems, emphasizing voltage flexibility, hardware configurability, and robust data integrity under harsh operating conditions.
FAQ
What is the function of the ORG pin on the 93AA66CT-I/MC?
The ORG pin on the 93AA66CT-I/MC selects memory organization: logic high (VCC) configures 256 × 16-bit mode, logic low (VSS) configures 512 × 8-bit mode. This hardware-selectable feature enables one PCB design to support two data-width configurations without firmware changes. The 93AA66CT-I/MC requires ORG to be statically biased - floating or AC-coupled connections are not permitted.
Does the 93AA66CT-I/MC require external pull-up resistors on its I/O lines?
The 93AA66CT-I/MC does not require external pull-ups on CS, CLK, or DI - these inputs have internal weak pull-downs. However, DO is open-drain and requires an external pull-up (typically 4.7 kΩ to VCC) to ensure valid logic high during Read and Ready/Busy status reporting. Pull-up value must balance rise time against bus capacitance and current consumption.
How does the 93AA66CT-I/MC handle power loss during a write cycle?
The 93AA66CT-I/MC incorporates hardware power-loss protection: if VCC drops below ~1.5 V during a write, the internal charge pump disables and the write aborts safely, leaving memory unchanged. No data corruption occurs. The device powers up in EWDS (Erase/Write Disable) state, preventing unintended writes after recovery - an explicit EWEN command is required before next programming.
Can the 93AA66CT-I/MC be used in a shared bus configuration with other Microwire devices?
Yes, the 93AA66CT-I/MC supports shared-bus operation via individual CS line control. Multiple 93AA66CT-I/MC devices can share CLK and DI/DO lines if each has a dedicated CS signal. DO outputs are High-Z when CS is low, preventing bus contention. Ensure setup/hold times (TCSS, TDIH) and clock frequency limits (≤3 MHz at 4.5–5.5 V) are met across all devices on the bus.
What is the maximum clock frequency supported by the 93AA66CT-I/MC at 1.8 V?
At VCC = 1.8 V, the 93AA66CT-I/MC supports a maximum clock frequency of 1 MHz, as specified in Table 1-2 (A1). This limit ensures reliable timing margins for TCKH (450 ns min), TCKL (450 ns min), and data setup/hold windows. Operating above this frequency risks command misinterpretation or incomplete writes, especially under temperature extremes.
93AA66CT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
93AA66CT-I/MC FAQ
1.How can I place an order for 93AA66CT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66CT-I/MC 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 93AA66CT-I/MC reliable?
The price and inventory of 93AA66CT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66CT-I/MC is usually 5 days.
3.What payment methods are accepted for 93AA66CT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66CT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66CT-I/MC?
93AA66CT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66CT-I/MC 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 93AA66CT-I/MC?
For technical support, including 93AA66CT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66CT-I/MC requirements.
6.How does Aetrix verify that 93AA66CT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93AA66CT-I/MC 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 93AA66CT-I/MC meets industry standards.
7.What is the process for return or replacement of 93AA66CT-I/MC?
All 93AA66CT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66CT-I/MC, 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 93AA66CT-I/MC part is unused and in its original packaging.
Return procedure for 93AA66CT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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