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Microchip Technology 93AA56BT-I/SN
- Part No.:
- 93AA56BT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA56BT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,343
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Product details
Overview
93AA56BT-I/SN from Microchip Technology 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 - used in embedded system configuration storage, sensor calibration retention, and firmware parameter backup.
For engineers reviewing the 93AA56BT-I/SN datasheet, 93AA56BT-I/SN pinout, 93AA56BT-I/SN application, or 93AA56BT-I/SN equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), SOIC-8 package compatibility, 1 million erase/write endurance, 200-year data retention, and support for sequential read and WRAL/ERAL commands in resource-constrained microcontroller systems.
Technical Context
The 93AA56BT-I/SN implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO lines - no ORG pin required, fixed 256 × 8-bit memory map. Communication begins with a Start bit (CS high + DI high on CLK rising edge), followed by opcode, 8-bit address, and 8-bit data for WRITE or READ operations.
Internal logic enforces power-on write protection: device powers up in EWDS (Erase/Write Disable) mode, requiring explicit EWEN command before any programming. Erase/write cycles are fully self-timed (6 ms typical), with DO pin asserting low during operation and high upon completion - enabling non-blocking polling in host firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit = 256 × 8-bit organization; no ORG pin - fixed byte-oriented access simplifies MCU driver implementation. |
| VCC range | 1.8 V to 5.5 V; supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting. |
| Endurance | 1,000,000 erase/write cycles; enables frequent parameter updates in field-deployed devices like smart meters or industrial sensors. |
| Data retention | Greater than 200 years at 25°C; ensures long-term reliability for unattended equipment and safety-critical configuration storage. |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI/DO); reduces MCU GPIO count and PCB routing complexity vs. SPI or I²C. |
| Timing (FCLK) | Up to 3 MHz at VCC ≥ 4.5 V; enables fast bulk reads (20 clocks per byte) while maintaining compatibility with low-power 100 kHz operation at 1.8 V. |
| Operating temp | −40°C to +85°C (Industrial grade); qualified for use in automotive body control modules, industrial PLCs, and outdoor IoT gateways. |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, 3.9 mm × 4.9 mm body, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICCS ≤ 5 µA). |
| 2 - CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in Start bit, opcode, address, and data; stoppable mid-sequence. |
| 3 - DI | Data Input | Accepts Start bit, instruction opcodes (e.g., 01 for WRITE), 8-bit address, and 8-bit data; tied high for Start detection. |
| 4 - DO | Data Output / Status | Outputs read data (D7–D0) or Ready/Busy signal (low = busy); enters High-Z when CS low or during non-read states. |
| 5 - VSS | Ground | Reference for all digital and analog circuitry; requires low-impedance connection to minimize noise coupling during write cycles. |
| 6 - NC | No Connect | Internally unconnected; must be left floating or tied to VSS - no external loading permitted. |
| 7 - NC | No Connect | Same as Pin 6; SOIC-8 variant of 93AA56B has no ORG pin - pins 6 and 7 are NC per datasheet Table 3-1. |
| 8 - VCC | Power Supply | 1.8–5.5 V input; internal POR triggers at ~1.5 V; must be ≥4.5 V for ERAL/WRAL execution. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host MCU initiates operation and polls DO; 6 ms typical cycle time reduces firmware overhead. |
| Automatic ERAL before WRAL | Ensures full array is erased prior to Write All, preventing data corruption from partial writes - critical for bootloader configuration recovery. |
| Power-on/off data protection | Hardware-level lockout below VCC ≈ 1.5 V prevents spurious writes during brown-out or hot-plug events - no software guardband required. |
| Sequential read mode | Enables continuous read across addresses with single CS assertion - cuts transaction time by >40% vs. individual byte reads in logging applications. |
| EWEN/EWDS security | Explicit enable/disable commands prevent accidental writes; device powers up in EWDS state - eliminates risk of unintended reprogramming after reset. |
Applications
| Smart Sensor Calibration Storage | Industrial PLC Configuration Backup |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation tables in MEMS pressure sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed at power-up and during field recalibration; uses sequential read for fast coefficient load. Use Value: Maintains measurement accuracy over 200+ years without battery backup; 1M endurance supports daily recalibration in predictive maintenance systems. | Use Scenario: Retaining ladder logic runtime parameters, I/O mapping, and alarm thresholds in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to ARM Cortex-M host via GPIO-banged Microwire; polled during boot and fault recovery. Use Value: Enables zero-downtime firmware updates - WRAL restores default settings if user config becomes corrupted; 1.8 V operation allows direct connection to 3.3 V MCU I/O. |
| Automotive Body Control Module | Medical Device Usage Log |
Use Scenario: Saving seat position memory, mirror angle presets, and lighting profiles in 12 V vehicle subsystems with local 3.3 V regulation. IC Role / Device Role / Timing Role: Dedicated 8-bit EEPROM (no ORG pin) minimizing driver complexity; operates across −40°C to +85°C ambient. Use Value: Industrial temp grade ensures reliability under hood heat soak; 5.5 V max VCC accommodates automotive load dump transients without external clamping. | Use Scenario: Recording sterilization cycles, usage hours, and error codes in portable infusion pumps and diagnostic handhelds. IC Role / Device Role / Timing Role: Tamper-resistant event logger with EWEN/EWDS enforced write locking; sequential read enables rapid audit trail export. Use Value: 200-year data retention satisfies FDA 21 CFR Part 11 long-term recordkeeping; 1.8 V min VCC extends battery life in low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-I/SN | VCC range 2.5–5.5 V; identical pinout, timing, and instruction set; no ORG pin; same 256 × 8-bit organization. | Not rated for 1.8 V operation - unsuitable for ultra-low-voltage wearables or energy-harvesting nodes. | Select 93LC56BT-I/SN only if system VCC is guaranteed ≥2.5 V and 1.8 V compatibility is unnecessary. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz clock, 1M endurance, SOIC-8 package. | Requires additional CS and MOSI/MISO lines; incompatible protocol - driver rewrite needed; higher speed but greater pin count. | Choose AT25020B-MAHL-T only when migrating to SPI-based platforms or requiring >3 MHz throughput. |
Compared with 93LC56BT-I/SN, the 93AA56BT-I/SN offers broader voltage flexibility (1.8 V support) for battery-powered designs, while the AT25020B-MAHL-T trades Microwire simplicity for SPI speed and ecosystem ubiquity - neither is pin- or code-compatible.
Availability
93AA56BT-I/SN is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical instrumentation, and IoT endpoint devices requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA56BT-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 MCU resource usage - emphasizing ease of integration, wide VCC tolerance, and robust data integrity.
FAQ
What is the memory organization of the 93AA56BT-I/SN?
The 93AA56BT-I/SN is a fixed 256 × 8-bit (2 Kbit) EEPROM with no ORG pin - it exclusively supports 8-bit word access. Unlike 'C' variants, it does not offer configurable x8/x16 organization. This simplifies firmware development by eliminating mode-setting logic and guarantees consistent byte-aligned addressing across all implementations of the 93AA56BT-I/SN.
Does the 93AA56BT-I/SN require an external pull-up resistor on the DO line?
No, the 93AA56BT-I/SN does not require an external pull-up on DO. The DO pin actively drives high or low during READ or Ready/Busy status reporting, and enters High-Z when inactive. However, if DI and DO are shorted (shared bus), a current-limiting resistor (e.g., 10 kΩ) is recommended between them to prevent bus conflict when A0 = high during the dummy zero phase of READ.
What is the minimum VCC required for ERAL or WRAL commands on the 93AA56BT-I/SN?
The 93AA56BT-I/SN requires VCC ≥ 4.5 V to execute ERAL (Erase All) or WRAL (Write All) commands. This is explicitly specified in the datasheet (DS21794G, pages 8 and 11). Attempting these operations below 4.5 V will result in failure - the device ignores the command or produces undefined behavior. System design must ensure regulated 4.5–5.5 V is present during bulk configuration restore sequences.
How does the 93AA56BT-I/SN handle power loss during a write cycle?
The 93AA56BT-I/SN incorporates hardware power-loss protection: if VCC drops below ~1.5 V during an erase/write cycle, the internal circuitry aborts the operation and retains pre-write data. No data corruption occurs. Additionally, the device powers up in EWDS (Erase/Write Disable) mode, preventing spurious writes during brown-out recovery - ensuring that the 93AA56BT-I/SN remains in a known-safe state across all power transitions.
Can the 93AA56BT-I/SN be used with a 1.8 V microcontroller without level shifters?
Yes, the 93AA56BT-I/SN is fully compatible with 1.8 V microcontrollers. Its VCC range (1.8–5.5 V), VIH1 threshold (2.0 V min at VCC ≥ 2.7 V, 0.7×VCC otherwise), and VOL1 (≤0.4 V at IOL = 2.1 mA) ensure reliable logic-level interoperability. At 1.8 V operation, VIH2 = 1.26 V and VIL2 = 0.36 V - well within standard 1.8 V CMOS I/O margins, eliminating need for external level translation circuitry.
93AA56BT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 128 x 16
- 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:
- 8-SOIC
93AA56BT-I/SN FAQ
1.How can I place an order for 93AA56BT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56BT-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 93AA56BT-I/SN reliable?
The price and inventory of 93AA56BT-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 93AA56BT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA56BT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56BT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56BT-I/SN?
93AA56BT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56BT-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 93AA56BT-I/SN?
For technical support, including 93AA56BT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56BT-I/SN requirements.
6.How does Aetrix verify that 93AA56BT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA56BT-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 93AA56BT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA56BT-I/SN?
All 93AA56BT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56BT-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 93AA56BT-I/SN part is unused and in its original packaging.
Return procedure for 93AA56BT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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