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Microchip Technology 93AA56/SN
- Part No.:
- 93AA56/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA56/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
93AA56/SN from Microchip Technology Inc. is a 2 Kbit (256 x 8 or 128 x 16) low-voltage serial Microwire EEPROM with single-supply operation down to 1.8 V, 70 µA typical active read current at 1.8 V, and 2 µA standby current. It features ORG-pin-selectable memory organization, self-timed erase/write cycles, and industry-standard 3-wire serial I/O for embedded nonvolatile data storage in space-constrained industrial control modules.
For engineers reviewing the 93AA56/SN datasheet, 93AA56/SN pinout, 93AA56/SN application, or 93AA56/SN equivalent, key selection criteria include voltage range (1.8–5.5 V), memory configuration flexibility (x8/x16 via ORG), endurance (1 million E/W cycles), data retention (>200 years), and SOIC-8 package compatibility with legacy Microwire host controllers.
Technical Context
The 93AA56/SN implements a synchronous 3-wire Microwire interface (CS, CLK, DI/DO) with start-bit detection and opcode-driven command execution. Memory organization is dynamically selected by the ORG pin: high for 128 × 16-bit, low for 256 × 8-bit mode - each with distinct address width (7-bit vs. 8-bit) and instruction cycle counts (18 vs. 27 clocks for READ).
It integrates power-on/off data protection, automatic ERAL before WRAL, and RDY/BSY status reporting via DO pin polling during erase/write. All programming operations require prior EWEN enable and are self-timed: typical write/erase = 4 ms/word, ERAL = 8 ms, WRAL = 16 ms - all ensured at VCC = 5 V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 or 128 × 16 bits) - supports dual-width firmware/data logging with single hardware footprint |
| Supply voltage | 1.8 V to 5.5 V - enables direct interface with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting |
| Active read current | 70 µA at 1.8 V - minimizes battery drain in always-on sensor nodes and portable instrumentation |
| Standby current | 2 µA at 1.8 V - ensures ultra-low quiescent power during system sleep modes |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration data updates in industrial field devices |
| Data retention | >200 years - guarantees long-term reliability in unattended infrastructure monitoring systems |
| Max clock frequency | 2 MHz at VCC ≥ 4.5 V - provides sufficient throughput for configuration storage without demanding MCU timing margins |
Pinout & Package
8-pin SOIC (SN) package per JEDEC MS-012 standard, 150 mil body width, surface-mount compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal logic and prevent spurious commands |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; stoppable at any point to accommodate slow master timing |
| DI | Data Input | Receives start bit, opcode, address, and write data; supports shared bus with DO only under strict impedance conditions |
| DO | Data Output / Status | Outputs read data or RDY/BSY status (low = busy); requires external pull-up when checking readiness post-write |
| VSS | Ground | Reference return path for all digital and analog functions; must be low-impedance for stable timing |
| ORG | Memory Organization | Selects x8 (VSS) or x16 (VCC) mode; floating allowed only ≤1 MHz in x16 mode |
| NU | Not Utilized | No internal connection; must be left unconnected or tied to VSS/VCC per layout best practice |
| VCC | Power Supply | 1.8–5.5 V input; internal protection inhibits programming below 1.4 V during power-up/down transitions |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 1.8 V operation | Eliminates need for auxiliary voltage rails in modern ultra-low-power designs |
| Self-timed erase/write | Removes requirement for precise external timing control or software delay loops |
| Automatic ERAL before WRAL | Guarantees full array erasure prior to bulk write, preventing partial-data corruption |
| Power-on/off data protection | Hardware-enforced lockout prevents accidental writes during brown-out or reset sequences |
| Sequential read function | Enables efficient block reads (e.g., parameter tables) with continuous CS assertion |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables in pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed at power-up and during field recalibration routines. Use Value: Ensures measurement accuracy over 200+ years without battery backup, leveraging 1M-cycle endurance for periodic recalibration. | Use Scenario: Holding user-defined therapy parameters and safety limits in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage of critical operational settings with hardware write-protection. Use Value: Meets IEC 62304 Class C requirements via automatic EWDS on power-up and explicit EWEN gating. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Retaining window position memory, mirror angle presets, and lighting profiles across ignition cycles. IC Role / Device Role / Timing Role: Low-quiescent-power shadow memory interfaced directly to 3.3 V CAN microcontroller. Use Value: 2 µA standby current extends battery life during vehicle dormancy; 1.8 V operation supports cold-cranking scenarios. | Use Scenario: Logging tariff schedules, demand response events, and meter firmware revision history in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: High-reliability data logger synchronized to real-time clock interrupts. Use Value: 1M endurance supports daily 100-record writes for >27 years; >200-year retention exceeds utility asset lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93AA56C/SN | Pin-compatible revision with enhanced ESD rating (6 kV HBM vs. 4 kV) and updated qualification per AEC-Q100 Grade 3 | Required for new automotive designs; not drop-in for legacy industrial use due to revised test documentation | Select 93AA56C/SN for production programs requiring extended reliability validation |
| AT25020B-MAHL-T | 2 Kbit SPI EEPROM (not Microwire); 3.3 V only; 5 MHz max clock; no ORG pin; different instruction set | Requires firmware rework for protocol translation; lacks x16 organization option | Choose only if migrating to SPI ecosystem and accepting software adaptation effort |
Compared with 93AA56/SN, the 93AA56C/SN offers higher ESD robustness and automotive qualification but identical electrical behavior and pinout, while the AT25020B-MAHL-T demands interface redesign and forfeits memory-width flexibility - making 93AA56C/SN the preferred upgrade path for continuity-critical deployments.
Availability
93AA56/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.
Supply support for 93AA56/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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93AA series was designed specifically for cost-sensitive, low-power embedded systems requiring reliable serial nonvolatile storage with minimal board space and simple 3-wire host integration.
FAQ
What is the maximum clock frequency supported by the 93AA56/SN?
The 93AA56/SN supports up to 2 MHz when VCC ≥ 4.5 V, and 1 MHz when VCC < 4.5 V. This scaling ensures timing compliance across its full 1.8–5.5 V operating range. The 93AA56/SN uses rising-edge clocking for all data transfers, and the clock may be paused mid-sequence without disrupting internal state - a key advantage for resource-constrained microcontrollers managing multiple peripherals.
How does the ORG pin affect memory organization in the 93AA56/SN?
The ORG pin selects between two memory configurations: tied to VCC enables 128 × 16-bit (x16) mode; tied to VSS enables 256 × 8-bit (x8) mode. The 93AA56/SN's instruction set, address width, and clock cycle count differ between modes - e.g., READ requires 18 clocks in x8 mode versus 27 in x16 mode. Floating ORG is permitted only at ≤1 MHz in x16 mode.
What is the purpose of the NU pin on the 93AA56/SN?
NU (Not Utilized) is an unconnected die pad with no internal circuitry. On the 93AA56/SN in SOIC-8 (SN) package, it occupies pin 5 and must remain unconnected in PCB layout. Unlike NC (No Connect) pins that may be reserved for future functionality, NU has zero electrical function - tying it to VSS or VCC is unnecessary and may introduce noise coupling.
Does the 93AA56/SN require external pull-up resistors on its I/O lines?
Yes - the 93AA56/SN requires an external pull-up resistor on the DO pin when using RDY/BSY polling after erase/write operations, as DO enters high-Z state post-cycle. CS and CLK do not require pull-ups since they are driven actively by the host controller. DI may need pull-down if shared with DO to prevent bus conflict during dummy-zero phase in read operations.
Is the 93AA56/SN suitable for new designs?
No - Microchip explicitly states "Not recommended for new designs" in the DS20067K datasheet, advising migration to the 93AA56C/SN variant. While the 93AA56/SN remains available for legacy support and existing production, new projects should use the 93AA56C/SN for improved ESD robustness (6 kV HBM), updated qualification, and continued long-term supply assurance.
93AA56/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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93AA56/SN FAQ
1.How can I place an order for 93AA56/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56/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 93AA56/SN reliable?
The price and inventory of 93AA56/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA56/SN is usually 5 days.
3.What payment methods are accepted for 93AA56/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56/SN?
93AA56/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56/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 93AA56/SN?
For technical support, including 93AA56/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56/SN requirements.
6.How does Aetrix verify that 93AA56/SN is sourced from the original manufacturer or authorized distributors?
All 93AA56/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 93AA56/SN meets industry standards.
7.What is the process for return or replacement of 93AA56/SN?
All 93AA56/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56/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 93AA56/SN part is unused and in its original packaging.
Return procedure for 93AA56/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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