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Microchip Technology 93AA56BX-I/SN
- Part No.:
- 93AA56BX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA56BX-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,892
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Product details
Overview
93AA56BX-I/SN from Microchip Technology Inc. is a 2 Kbit low-voltage serial EEPROM with 256 × 8-bit organization, 1.8–5.5 V supply range, and industrial temperature rating (−40°C to +85°C). It features Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), self-timed erase/write cycles, and power-on/off data protection. Used for nonvolatile parameter storage in embedded microcontroller systems requiring reliable, low-power memory.
For engineers reviewing the 93AA56BX-I/SN datasheet, 93AA56BX-I/SN pinout, 93AA56BX-I/SN application, or 93AA56BX-I/SN equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), 8-bit x256 organization, SOIC-8 package (SN), industrial temperature support, and Microwire protocol compliance - critical for legacy MCU peripheral interfaces and space-constrained designs.
Technical Context
The 93AA56BX-I/SN implements a synchronous serial Microwire interface with dedicated CS, CLK, DI, and DO pins. It operates without an ORG pin (fixed 8-bit word size), eliminating external configuration logic required by 'C' variants. Internal power-on reset and voltage detect circuitry (VPOR = 1.5 V typical) ensure data integrity during brown-out conditions.
Its architecture supports sequential read, automatic erase-before-write, ERAL (Erase All), and WRAL (Write All) commands. Ready/Busy status is signaled via DO pin polling during erase/write operations, enabling software-controlled timing without fixed delays - essential for deterministic firmware execution in real-time systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit organization); provides compact nonvolatile storage for calibration data, device IDs, or configuration registers. |
| 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. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); requires only four GPIOs and no additional protocol stack overhead. |
| Endurance | 1,000,000 erase/write cycles; supports frequent field updates in telemetry, metering, or adaptive control applications. |
| Data Retention | Greater than 200 years at +25°C; ensures long-term reliability in unattended or maintenance-free deployments. |
| Access Time | TPD ≤ 400 ns (at 1.8 V, CL = 100 pF); delivers fast read response for time-critical parameter fetches in real-time firmware. |
| Write Cycle Time | TWC = 6 ms (erase/write); enables predictable timeout handling in embedded drivers without hardware wait-state logic. |
Pinout & Package
93AA56BX-I/SN is housed in an 8-lead SOIC package (SN), measuring 3.9 mm × 4.9 mm × 1.75 mm, with Pb-free Matte Tin finish and industrial-grade thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions to reset internal state and prevent spurious command latching. |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; supports clock stop/resume and variable frequency up to 3 MHz (at VCC ≥ 4.5 V). |
| DI | Data Input | Accepts start bit, opcode, address, and write data; high-impedance when not selected, compatible with shared bus topologies. |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read operations. |
| VSS | Ground | Reference return path for all I/O and internal circuitry; requires low-impedance connection to minimize noise coupling into serial interface. |
| NC | No Internal Connection | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practices - no functional role. |
| VCC | Power Supply | Supplies core logic and memory array; includes built-in voltage detect (1.5 V threshold) to inhibit writes during power ramp-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control or watchdog timeouts - firmware simply polls DO pin until ready. |
| Automatic ERAL before WRAL | Ensures full memory initialization prior to bulk write, preventing partial corruption if WRAL is issued without prior ERAL. |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V prevents accidental overwrites during power transitions or brownouts. |
| Ready/Busy status signaling | DO pin doubles as status indicator, enabling efficient polling-based driver implementation without dedicated status registers. |
| 1,000,000 endurance cycles | Supports daily reconfiguration over 27+ years - suitable for firmware update logs, usage counters, and adaptive tuning tables. |
Applications
| Industrial Sensor Calibration | Legacy MCU Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter memory accessed at boot and during field recalibration; reads occur at startup, writes only during maintenance mode. Use Value: Maintains accuracy across power cycles and device replacements; 200-year retention eliminates recalibration schedules in sealed enclosures. |
Use Scenario: Holding bootloader configuration flags, UART baud rates, and I/O pin mappings in 8-bit microcontroller-based HVAC controllers. IC Role / Device Role / Timing Role: Serial peripheral providing persistent settings independent of main MCU flash; accessed via GPIO bit-banged Microwire. Use Value: Enables field-upgradable configurations without reflashing MCU firmware; 1.8 V operation supports battery-backed operation during AC loss. |
| Medical Device Settings Backup | Smart Meter Firmware Metadata |
Use Scenario: Saving user-adjusted therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable insulin pumps. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory storing validated clinical settings; write-protected via EWEN/EWDS sequence during normal operation. Use Value: Prevents accidental overwrite during runtime; 1M endurance supports lifetime device usage with daily parameter adjustments. |
Use Scenario: Storing firmware version, encryption keys, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure auxiliary memory holding immutable metadata; accessed only by trusted bootloader during secure boot verification. Use Value: Provides tamper-evident storage for regulatory compliance; industrial temp rating ensures reliability inside outdoor meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-I/SN | 128 × 16-bit organization; same VCC range (1.8–5.5 V), identical SOIC-8 package and pinout. | Requires 16-bit data path alignment; unsuitable for 8-bit MCU systems without byte-swapping logic. | Select only when system architecture natively supports 16-bit word access and memory map efficiency outweighs software complexity. |
| AT25020B-MAU-1.8 | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, same industrial temp grade and SOIC-8 package. | Uses SPI protocol instead of Microwire; incompatible instruction set and timing - requires driver rewrite. | Choose when migrating to SPI-based platforms or consolidating with other SPI peripherals; not drop-in replaceable. |
Compared with 93LC56B-I/SN, the 93AA56BX-I/SN offers native 8-bit compatibility without data-width conversion; compared with AT25020B-MAU-1.8, it preserves legacy Microwire firmware but lacks SPI ecosystem integration - selection depends on interface continuity versus future-proofing needs.
Availability
93AA56BX-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, legacy MCU configuration storage, medical device settings backup, and smart meter firmware metadata requiring stable component supply and long-lifecycle support.
Supply support for 93AA56BX-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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs, including the 93AA56BX-I/SN, were designed specifically for cost-sensitive, low-power embedded systems requiring simple, robust serial nonvolatile memory - especially where Microwire protocol compatibility and wide voltage operation are mandatory.
FAQ
What is the memory organization of the 93AA56BX-I/SN?
The 93AA56BX-I/SN has a fixed 256 × 8-bit organization (2 Kbit total), with no ORG pin - unlike 'C' variants. This means it always operates in 8-bit mode, accepting 8-bit addresses and transferring 8-bit data per read/write cycle. The 'X' in the part number denotes the SOIC-8 package (SN), and the 'I' suffix confirms industrial temperature range (−40°C to +85°C). No external configuration is needed to select word size.
Does the 93AA56BX-I/SN require an external pull-up resistor on the DO pin?
No, the 93AA56BX-I/SN does not require an external pull-up on DO. The DO pin actively drives high or low during read operations and asserts Ready/Busy status directly. During non-read states (e.g., standby or write), DO enters High-Z mode - so a pull-up is unnecessary and may interfere with status polling. If sharing DI/DO on a single line, a current-limiting resistor (e.g., 10 kΩ) is recommended to avoid bus conflict during dummy-zero read phases.
How is write protection implemented on the 93AA56BX-I/SN?
Write protection on the 93AA56BX-I/SN uses a two-step command protocol: Erase/Write Enable (EWEN) must be issued before any ERASE or WRITE command, and Erase/Write Disable (EWDS) disables further writes until the next EWEN. The device powers up in EWDS mode by default. This prevents accidental overwrites during power transitions or firmware glitches - a hardware-enforced safeguard independent of software state.
What is the maximum clock frequency supported by the 93AA56BX-I/SN at 3.3 V?
At VCC = 3.3 V, the 93AA56BX-I/SN supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This applies across the full industrial temperature range. Clock timing margins (TCKH ≥ 250 ns, TCKL ≥ 200 ns) must also be met. Exceeding 2 MHz at 3.3 V risks setup/hold violations and unreliable command execution - no derating is permitted beyond datasheet AC limits.
Can the 93AA56BX-I/SN be used in battery-powered applications with 1.8 V supply?
Yes, the 93AA56BX-I/SN is fully specified down to 1.8 V and supports all functions - including read, write, erase, and status polling - at this voltage. Its ICC read current is ≤500 µA and ICC write current ≤2 mA at 1.8 V, making it suitable for low-power battery-operated devices. The VPOR threshold of 1.5 V ensures write inhibition during brown-out, preserving data integrity even as battery voltage decays.
93AA56BX-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:
- 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
93AA56BX-I/SN FAQ
1.How can I place an order for 93AA56BX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56BX-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 93AA56BX-I/SN reliable?
The price and inventory of 93AA56BX-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 93AA56BX-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA56BX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56BX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56BX-I/SN?
93AA56BX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56BX-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 93AA56BX-I/SN?
For technical support, including 93AA56BX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56BX-I/SN requirements.
6.How does Aetrix verify that 93AA56BX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA56BX-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 93AA56BX-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA56BX-I/SN?
All 93AA56BX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56BX-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 93AA56BX-I/SN part is unused and in its original packaging.
Return procedure for 93AA56BX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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