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Microchip Technology 93AA56AT-I/OT
- Part No.:
- 93AA56AT-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93AA56AT-I/OT.pdf
- Description:
- IC EEPROM 2KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,029
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Product details
Overview
93AA56AT-I/OT from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - deployed in embedded microcontroller systems for parameter storage and calibration data retention.
For engineers reviewing the 93AA56AT-I/OT datasheet, 93AA56AT-I/OT pinout, 93AA56AT-I/OT application, or 93AA56AT-I/OT equivalent, key selection criteria include its SOT-23-6 package footprint, 8-bit fixed organization (no ORG pin), 1 million erase/write endurance, >200-year data retention, and compatibility with legacy Microwire controllers requiring minimal I/O resources.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO signals with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions with clock-synchronized bit transfer on rising CLK edges.
Internal logic includes address decoding, mode control, output buffering, and power-on reset circuitry that inhibits all operations below ~1.5 V. The absence of ORG pin confirms fixed 8-bit word organization, eliminating external configuration logic required by 'C' variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - provides compact nonvolatile storage for firmware flags, sensor offsets, or device IDs in space-constrained designs. |
| 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-shifting. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates such as logging or adaptive tuning in industrial controllers. |
| Data retention | >200 years at 25°C - ensures long-term reliability for unattended equipment like utility meters or remote sensors. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - reduces MCU GPIO usage and simplifies PCB routing versus SPI or I²C. |
| Access time | Max 400 ns TPD at 1.8 V - delivers fast read response for real-time configuration access in timing-critical applications. |
| Write cycle time | 6 ms typical (TWC) - defines minimum interval between successive writes; impacts firmware update latency and wear-leveling strategy. |
Pinout & Package
Package: SOT-23-6 (lead-free, matte tin finish), 2.9 mm × 1.6 mm footprint, suitable for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DO | Data Output / Ready-Busy indicator | Tri-state output delivering memory data during READ or asserting low during active erase/write - eliminates need for external status polling hardware. |
| VSS | Ground reference | Primary return path for internal logic and I/O; must be connected directly to system ground plane to ensure noise immunity. |
| DI | Data Input | Serial input for opcodes, addresses, and write data - shares no internal path with DO, enabling bidirectional bus operation only with external resistor isolation. |
| VCC | Power supply | Supplies core logic and memory array; internal voltage detector disables writes below ~1.5 V to prevent corruption during brownout. |
| CS | Chip Select | Active-high enable signal; falling edge initiates self-timed write/erase after instruction load - requires ≥250 ns low time between commands. |
| CLK | Serial clock | Synchronizes all data transfers on rising edge; stoppable at any point to accommodate variable MCU timing margins. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates external timing control - firmware only waits for DO high or polls status, reducing CPU overhead and interrupt dependency. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial-write corruption when updating entire configuration sets. |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR (~1.5 V) - prevents accidental erasure during power ramp-up/down sequences. |
| Ready/Busy status on DO | Enables asynchronous status checking without dedicated interrupt lines - simplifies integration into resource-limited 8-bit MCUs. |
| Sequential read function | Allows continuous address incrementing while CS remains high - cuts read latency for multi-byte parameter blocks (e.g., calibration tables). |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-trimmed ADC gain/offset coefficients and user-adjusted alarm thresholds in a portable blood glucose meter. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at power-up and during field recalibration; operates under 3.3 V supply with <100 µA standby current. Use Value: Ensures measurement accuracy across battery life and temperature drift without requiring external backup power or supercapacitors. | Use Scenario: Retaining patient-specific therapy settings and device serial number in an infusion pump with regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure configuration vault supporting cryptographic key derivation seeds and audit logs; withstands 1M+ write cycles over 10-year service life. Use Value: Meets IEC 62304 Class C software safety requirements through deterministic write completion and built-in data integrity safeguards. |
| Automotive Body Control Module | Consumer Appliance Settings Storage |
Use Scenario: Saving door lock/unlock preferences, mirror position memory, and lighting profiles in a vehicle BCM operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to 5 V MCU via Microwire; leverages TSSOP-8 or SOT-23-6 packages for AEC-Q200-compliant layout. Use Value: Delivers guaranteed data retention beyond vehicle lifetime (>15 years) without thermal derating penalties seen in consumer-grade parts. | Use Scenario: Holding user-selected wash cycles, spin speeds, and language preferences in a front-load washing machine controller. IC Role / Device Role / Timing Role: Low-cost, low-pin-count NVM for feature-rich UIs; communicates over 3.3 V Microwire bus with <2 ms write latency per parameter group. Use Value: Reduces BOM cost versus SPI Flash by 30% while maintaining sufficient endurance for 10,000+ power cycles over product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56AT-I/OT | Requires minimum 2.5 V VCC; identical 256 × 8-bit organization and SOT-23-6 package. | Not suitable for 1.8 V systems; otherwise drop-in compatible in 3.3 V/5 V designs with same timing and instruction set. | Select when higher VCC stability is prioritized over ultra-low-voltage operation. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin - relies on WIP flag polling. | Requires additional CS and MOSI/MISO lines; lacks hardware status signaling - increases firmware complexity for write synchronization. | Choose for systems already using SPI peripherals and where board space allows extra trace routing. |
Compared with 93LC56AT-I/OT, the 93AA56AT-I/OT supports lower VCC down to 1.8 V while retaining identical pinout and command structure; versus AT25020B-MAHL-T, it offers simpler 3-wire control and dedicated DO status signaling but trades off maximum clock speed for reduced pin count and deterministic timing.
Availability
93AA56AT-I/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and consumer appliance settings storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93AA56AT-I/OT 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, with global design and manufacturing operations.
The 93XX series EEPROMs were designed specifically for cost-sensitive, low-power embedded systems needing reliable, pin-efficient nonvolatile memory - emphasizing micropower operation, wide VCC tolerance, and robust data retention without external support circuitry.
FAQ
What is the memory organization of the 93AA56AT-I/OT?
The 93AA56AT-I/OT is a fixed 256 × 8-bit (2 Kbit) organization device with no ORG pin - unlike 'C' variants, it does not support 16-bit mode. This simplifies hardware design by eliminating external logic for word-size selection and ensures consistent 8-bit data framing in all applications using the 93AA56AT-I/OT.
Does the 93AA56AT-I/OT require an external pull-up resistor on the DO pin?
No, the 93AA56AT-I/OT does not require an external pull-up on DO. The DO pin is actively driven high or low during READ or Ready/Busy status reporting and enters High-Z state when inactive. However, if DI and DO are shorted (shared bus), a 10 kΩ series resistor is recommended to prevent bus conflict during dummy-zero read phases - a design consideration specific to the 93AA56AT-I/OT's Microwire protocol behavior.
What is the minimum VCC required for write operations on the 93AA56AT-I/OT?
The 93AA56AT-I/OT requires VCC ≥ 1.8 V for functional operation, but write/erase operations are inhibited below a typical power-on reset threshold of ~1.5 V (VPOR). Therefore, valid programming requires sustained VCC ≥ 1.8 V - verified by the device's internal voltage detector, which holds EWEN/EWDS latches inactive until stable supply is confirmed. This behavior is intrinsic to the 93AA56AT-I/OT's architecture.
Can the 93AA56AT-I/OT be used in place of the 93LC56AT-I/OT?
Yes, the 93AA56AT-I/OT is functionally and pin-compatible with the 93LC56AT-I/OT in 8-bit mode, but operates down to 1.8 V (vs. 2.5 V minimum for 93LC56AT-I/OT). Both share identical SOT-23-6 pinout, instruction set, and timing - making the 93AA56AT-I/OT a direct upgrade for low-voltage designs. No PCB changes are needed when substituting the 93AA56AT-I/OT.
How is Ready/Busy status monitored on the 93AA56AT-I/OT?
Ready/Busy status is monitored by sampling the DO pin after bringing CS high for ≥250 ns following instruction initiation. DO = low indicates ongoing erase/write; DO = high signals completion. The 93AA56AT-I/OT asserts this status natively on DO without requiring additional control lines - a key differentiator from SPI EEPROMs that rely on status register reads.
93AA56AT-I/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 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:
- SOT-23-6
93AA56AT-I/OT FAQ
1.How can I place an order for 93AA56AT-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56AT-I/OT 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 93AA56AT-I/OT reliable?
The price and inventory of 93AA56AT-I/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA56AT-I/OT is usually 5 days.
3.What payment methods are accepted for 93AA56AT-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56AT-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56AT-I/OT?
93AA56AT-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56AT-I/OT 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 93AA56AT-I/OT?
For technical support, including 93AA56AT-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56AT-I/OT requirements.
6.How does Aetrix verify that 93AA56AT-I/OT is sourced from the original manufacturer or authorized distributors?
All 93AA56AT-I/OT 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 93AA56AT-I/OT meets industry standards.
7.What is the process for return or replacement of 93AA56AT-I/OT?
All 93AA56AT-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56AT-I/OT, 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 93AA56AT-I/OT part is unused and in its original packaging.
Return procedure for 93AA56AT-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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