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Microchip Technology 93AA56AT-I/MS
- Part No.:
- 93AA56AT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93AA56AT-I/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,433
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Product details
Overview
93AA56AT-I/MS 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 control firmware storage and sensor calibration data retention.
For engineers reviewing the 93AA56AT-I/MS datasheet, 93AA56AT-I/MS pinout, 93AA56AT-I/MS application, or 93AA56AT-I/MS equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), MSOP-8 package compatibility, 1 million erase/write endurance, >200-year data retention, and support for sequential read and WRAL/ERAL commands under 1.8 V operation.
Technical Context
The 93AA56AT-I/MS implements a synchronous serial Microwire protocol with CS/CLK/DI/DO signals and no ORG pin - confirming fixed 256 × 8-bit memory mapping. Its internal logic enforces power-on write protection, requires EWEN before programming, and uses DO pin polling for Ready/Busy status during TWC = 6 ms erase/write cycles.
It supports clock frequencies up to 3 MHz at VCC ≥ 4.5 V, with timing parameters including TCKH ≥ 200 ns, TCSS ≥ 50 ns, and TPD ≤ 400 ns (at 1.8 V). The device enters Standby mode when CS is low, drawing only 1 µA typical ICCS, and features built-in voltage detect (VPOR = 1.5 V) for POR-based data protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin; no word-size reconfiguration. |
| Supply voltage | 1.8–5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters. |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V; ensures long-term field reliability in frequent-update applications. |
| Data retention | >200 years - specified at 25°C; guarantees nonvolatile storage integrity across product lifecycles. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - requires no additional control lines; supports daisy-chaining only via external multiplexing. |
| Timing (TWC) | 6 ms max erase/write cycle time - self-timed; eliminates need for external delay timers or software wait loops. |
| Standby current | 1 µA typical (I-temp) - enables ultra-low-power operation in battery-backed or energy-harvesting systems. |
Pinout & Package
8-pin MSOP (MS) package, 3.0 × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot; pin 1 located at bottom-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed programming on falling edge. |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence without state loss. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; tied high with CS to detect Start condition. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read operations. |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; must be connected before VCC; exposed pad may connect here. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice; not usable as strap or debug pin. |
| 7 (ORG) | Organization | No internal connection on 93AA56A variants - pin is NC; unused and electrically isolated. |
| 8 (VCC) | Power Supply | 1.8–5.5 V input; includes on-chip voltage detect (VPOR = 1.5 V) to inhibit writes during brown-out. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry; 6 ms max cycle time ensures deterministic firmware flow without polling overhead beyond DO status check. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial-write corruption without requiring separate ERAL command in host firmware. |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR = 1.5 V; prevents inadvertent writes during power ramp-up/down or brown-out events. |
| Sequential read mode | Enables continuous address increment while CS remains high - reduces instruction overhead for block reads (e.g., configuration tables). |
| EWEN/EWDS security | Explicit enable/disable of erase/write functions adds firmware-level control layer; powers up in EWDS state to prevent accidental writes at boot. |
Applications
| Industrial Sensor Calibration | Embedded Controller Firmware Storage |
|---|---|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation lookup tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at power-up; retains values across 10+ year deployments with zero refresh. Use Value: Eliminates need for external trimming components or host MCU flash partitioning; supports field recalibration via simple SPI-like command sequence. | Use Scenario: Holding bootloader configuration flags, secure boot keys, and runtime update metadata in HVAC control modules. IC Role / Device Role / Timing Role: Secure, low-power configuration vault; accessed only during boot or OTA update phases. Use Value: Provides tamper-resistant storage independent of main MCU flash wear; 1M endurance exceeds typical field update cycles by 100×. |
| Medical Device Parameter Backup | Automotive Body Control Module NVM |
Use Scenario: Retaining user-adjusted therapy settings and usage logs in portable infusion pumps operating on coin-cell batteries. IC Role / Device Role / Timing Role: Ultra-low-power data logger; writes occur infrequently but must survive >10 years of shelf life. Use Value: 1 µA standby current and >200-year retention meet IEC 62304 Class C longevity requirements without supplemental capacitors. | Use Scenario: Saving seat/mirror position presets and lighting configuration profiles in 12 V automotive BCMs. IC Role / Device Role / Timing Role: Robust NVM co-located with MCU; withstands load-dump transients and cold-crank voltage dips. Use Value: 1.8 V min operating voltage and 1.5 V VPOR ensure reliable operation during cranking (≥6 V nominal, dips to ~6.5 V); Pb-free MSOP suits reflow assembly. |
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/MS | Same 256 × 8-bit organization, but 2.5–5.5 V VCC range; lacks 1.8 V operation capability. | Not suitable for 1.8 V systems; otherwise identical pinout, timing, and command set. | Select only if system VCC never falls below 2.5 V; verify brown-out immunity margin against 93AA56AT-I/MS's 1.5 V VPOR. |
| AT25020B-MAHL-T | 2 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz clock; no Ready/Busy pin - relies on WIP flag polling. | Requires SPI master with WIP polling logic; incompatible Microwire command structure and timing. | Choose for higher throughput (20 MHz vs 3 MHz) or SPI-native designs; accept added firmware complexity for status checking. |
Compared with 93LC56AT-I/MS, the 93AA56AT-I/MS extends low-voltage operation to 1.8 V and lowers VPOR to 1.5 V for enhanced brown-out resilience; versus AT25020B-MAHL-T, it offers simpler 3-wire control and hardware Ready/Busy signaling but at lower speed and fixed Microwire protocol.
Availability
93AA56AT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller firmware storage, and medical device parameter backup requiring stable component supply across extended product lifecycles.
Supply support for 93AA56AT-I/MS 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.
The 93XX series EEPROMs were designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and firmware overhead - especially where Microwire compatibility and wide VCC range are critical.
FAQ
What is the memory organization of the 93AA56AT-I/MS?
The 93AA56AT-I/MS is a fixed 256 × 8-bit (2 Kbit) EEPROM with no ORG pin - confirming dedicated x8 organization. Unlike 'C' variants, it does not support x16 mode or external word-size selection. This simplifies interface design by eliminating ORG pin routing and logic-level dependencies.
Does the 93AA56AT-I/MS support 1.8 V operation?
Yes, the 93AA56AT-I/MS operates across 1.8–5.5 V, making it compatible with modern ultra-low-power MCUs. Its 1.5 V power-on reset threshold (VPOR) ensures write protection during 1.8 V rail ramp-up, and AC timing parameters (e.g., TCKH ≥ 450 ns at 1.8 V) are fully characterized down to this voltage.
How is Ready/Busy status signaled on the 93AA56AT-I/MS?
The 93AA56AT-I/MS signals Ready/Busy status on the DO pin: DO = low indicates active erase/write, DO = high means operation complete. Status is valid only after CS is brought high for ≥250 ns post-command; DO returns to High-Z when CS is low or during read idle.
What is the purpose of the ORG pin on the 93AA56AT-I/MS?
The ORG pin is not functional on the 93AA56AT-I/MS - it is internally unconnected (NC) as confirmed by the Device Selection Table and Pin Function Table. This distinguishes it from 'C' variants and aligns with its fixed x8 organization; the pin must be left floating or tied to VSS per layout guidelines.
What packaging format is used for the 93AA56AT-I/MS?
The 93AA56AT-I/MS uses an 8-pin MSOP (Mini Small Outline Package) with 3.0 × 3.0 mm body, 0.65 mm lead pitch, and optional exposed thermal pad. It is RoHS-compliant, Pb-free (Matte Tin finish), and rated for industrial temperature (–40°C to +85°C).
93AA56AT-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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:
- 8-MSOP
93AA56AT-I/MS FAQ
1.How can I place an order for 93AA56AT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56AT-I/MS 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/MS reliable?
The price and inventory of 93AA56AT-I/MS 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/MS is usually 5 days.
3.What payment methods are accepted for 93AA56AT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56AT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56AT-I/MS?
93AA56AT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56AT-I/MS 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/MS?
For technical support, including 93AA56AT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56AT-I/MS requirements.
6.How does Aetrix verify that 93AA56AT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93AA56AT-I/MS 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/MS meets industry standards.
7.What is the process for return or replacement of 93AA56AT-I/MS?
All 93AA56AT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56AT-I/MS, 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/MS part is unused and in its original packaging.
Return procedure for 93AA56AT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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