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Microchip Technology 93AA66CX-I/SN
- Part No.:
- 93AA66CX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66CX-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,139
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Product details
Overview
93AA66CX-I/SN from Microchip Technology 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 temperature operation (–40°C to +85°C), used for parameter storage in embedded controllers and sensor calibration modules.
For engineers reviewing the 93AA66CX-I/SN datasheet, 93AA66CX-I/SN pinout, 93AA66CX-I/SN application, or 93AA66CX-I/SN equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), ORG-configurable word size, self-timed write/erase timing (6 ms), Ready/Busy status signaling on DO, and SOIC-8 packaging with Pb-free matte tin finish.
Technical Context
The 93AA66CX-I/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO lines, supporting both x8 and x16 memory organizations selected by the ORG pin logic level. Its internal architecture includes auto-erase-before-write, ERAL (Erase All), and WRAL (Write All) commands, all initiated by CS falling edge (for AA-series) with status reported via DO pin.
Power-on data protection is enforced by a 1.5 V VCC detect threshold; standby current is ≤1 µA at industrial temperature. The device operates across 1.8–5.5 V with clock frequencies up to 3 MHz (at VCC ≥4.5 V), and supports sequential read, dummy-zero read preamble, and bus-conflict mitigation via external DI/DO resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit or 256 × 16-bit, selectable via ORG pin) |
| Supply Voltage | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no SPI mode bits required |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent field-updatable configuration storage |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unpowered systems |
| Write Cycle Time | 6 ms typical - deterministic timing for firmware-controlled timeout handling |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for industrial control and automotive body electronics |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free matte tin finish, 150 mil width, standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed erase/write on falling edge |
| CLK | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; stoppable mid-sequence without state corruption |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; tied to DO in shared-bus configurations with current-limiting resistor |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
| ORG | Organization Select | Logic high → 256 × 16-bit; logic low → 512 × 8-bit; must be externally biased, not floating |
| NC | No Connect | Internally unconnected; may be left open or tied to VSS/VCC per layout convenience |
| VCC | Power Supply | 1.8–5.5 V input; internal POR triggers at ~1.5 V; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single BOM support for both 8-bit and 16-bit host interfaces without firmware changes |
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (6 ms max) |
| ERAL and WRAL commands | Reduces firmware overhead for full-memory initialization: ERAL clears all bits; WRAL writes same value to all locations |
| Ready/Busy status on DO | Allows real-time progress monitoring during programming without dedicated status register reads |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC prevents corruption during brown-out or power ramp |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables in pressure or temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization and field recalibration routines. Use Value: 1M endurance and >200-year retention ensure calibration data survives 10+ years of field deployment with monthly updates. | Use Scenario: Holding user-defined settings (e.g., display brightness, communication baud rate, alarm thresholds) in HVAC controllers. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to MCU GPIOs using minimal 3-wire Microwire protocol. Use Value: 1.8–5.5 V operation allows direct use with 3.3 V or 5 V MCUs; ORG pin supports either 8-bit or 16-bit host data paths. |
| Automotive Body Control Module | Medical Device Usage Logs |
Use Scenario: Recording door lock actuation history, mirror position presets, and lighting profiles in BCMs. IC Role / Device Role / Timing Role: Industrial-grade EEPROM storing infrequently updated but safety-critical user preferences. Use Value: –40°C to +85°C rating meets automotive interior ambient requirements; ERAL command simplifies factory reset functionality. | Use Scenario: Capturing timestamped usage events (e.g., therapy session start/end, battery charge cycles) in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power nonvolatile log buffer written during shutdown or periodic save intervals. Use Value: 1 µA standby current extends battery life; self-timed 6 ms writes minimize active time during critical power-down sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66C-I/SN | Same 4 Kbit capacity and SOIC-8 package, but requires 2.5–5.5 V supply (no 1.8 V support) | Not suitable for 1.8 V systems; otherwise identical instruction set and timing | Select if system VCC ≥2.5 V and cost optimization is prioritized over ultra-low-voltage operation |
| AT25040B-MAHL-T | 4 Kbit SPI EEPROM (not Microwire), 1.8–5.5 V, 20 MHz SPI clock, no ORG pin (fixed 8-bit) | Lacks word-size flexibility; requires SPI peripheral instead of GPIO-bitbanged Microwire | Choose when existing design uses SPI hardware peripheral and does not require x16 organization |
Compared with 93LC66C-I/SN, the 93AA66CX-I/SN adds 1.8 V operation for battery-powered designs; compared with AT25040B-MAHL-T, it retains Microwire compatibility and ORG-selectable word size but trades higher maximum clock speed for simpler interface implementation.
Availability
93AA66CX-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-decade product lifecycles.
Supply support for 93AA66CX-I/SN 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs were designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and flexible voltage operation - particularly targeting industrial, automotive, and consumer applications where Microwire compatibility and long-term data integrity are essential.
FAQ
What is the function of the ORG pin on the 93AA66CX-I/SN?
The ORG pin on the 93AA66CX-I/SN selects memory organization: logic high (VCC) configures 256 × 16-bit mode; logic low (VSS) configures 512 × 8-bit mode. This pin must be externally biased - floating is not allowed. Unlike A/B variants, the 'C' suffix indicates ORG functionality is present, making the 93AA66CX-I/SN adaptable to both 8-bit and 16-bit host data buses without hardware redesign.
Does the 93AA66CX-I/SN support 1.8 V operation?
Yes, the 93AA66CX-I/SN supports a supply voltage range of 1.8 V to 5.5 V, verified across the full industrial temperature range (–40°C to +85°C). At 1.8 V, clock frequency is limited to 1 MHz, and write cycle time remains 6 ms. This enables direct integration into ultra-low-power systems such as battery-operated sensors and wearables without level-shifting circuitry.
How does the Ready/Busy status work on the 93AA66CX-I/SN?
The 93AA66CX-I/SN reports Ready/Busy status on the DO pin: logic low indicates an erase or write operation is in progress; logic high means the device is ready for the next command. Status is only valid after CS is brought high for ≥250 ns following the initiating CS low pulse. Issuing a new Start bit and then lowering CS clears the status flag, allowing immediate re-polling.
What is the difference between ERAL and WRAL commands on the 93AA66CX-I/SN?
The ERAL (Erase All) command sets all memory bits to logical '1'; WRAL (Write All) writes a user-supplied 8-bit or 16-bit value to every location - and automatically executes ERAL first. Both commands require VCC ≥4.5 V and the device to be in EWEN (Erase/Write Enable) state. WRAL eliminates separate erase-and-write firmware steps, reducing code size and execution time for full-memory updates.
Is the 93AA66CX-I/SN pin-compatible with other 93XX66 devices in SOIC-8 package?
Yes, the 93AA66CX-I/SN is pin-compatible with all 93XX66A/B/C variants in SOIC-8 (SN) package, sharing identical pinout: CS (1), CLK (2), DI (3), DO (4), VSS (5), ORG (6), NC (7), VCC (8). However, functional compatibility depends on ORG usage: A-variants lack ORG (pin 6 is NC), B-variants fix x16 mode, while the 93AA66CX-I/SN requires ORG to be actively driven for configuration.
93AA66CX-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 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-SOIC
93AA66CX-I/SN FAQ
1.How can I place an order for 93AA66CX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66CX-I/SN 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 93AA66CX-I/SN reliable?
The price and inventory of 93AA66CX-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66CX-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66CX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66CX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66CX-I/SN?
93AA66CX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66CX-I/SN 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 93AA66CX-I/SN?
For technical support, including 93AA66CX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66CX-I/SN requirements.
6.How does Aetrix verify that 93AA66CX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66CX-I/SN 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 93AA66CX-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66CX-I/SN?
All 93AA66CX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66CX-I/SN, 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 93AA66CX-I/SN part is unused and in its original packaging.
Return procedure for 93AA66CX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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