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Microchip Technology 93AA56AT-I/SN
- Part No.:
- 93AA56AT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA56AT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,340
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Product details
Overview
93AA56AT-I/SN 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, Ready/Busy status via DO pin, and 1,000,000 endurance cycles. Used for configuration storage in microcontroller-based embedded systems requiring nonvolatile memory with minimal pin count.
For engineers reviewing the 93AA56AT-I/SN datasheet, 93AA56AT-I/SN pinout, 93AA56AT-I/SN application, or 93AA56AT-I/SN equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), SOIC-8 package compatibility, 3-wire serial timing compliance, power-on data protection, and support for sequential read and WRAL/ERAL operations in resource-constrained designs.
Technical Context
The 93AA56AT-I/SN implements a synchronous Microwire-compatible protocol using CS, CLK, and DI/DO signals. All instructions-including READ (20 clocks), WRITE (20 clocks), ERASE (12 clocks), and WRAL (20 clocks)-are initiated by a Start bit followed by opcode, address, and data fields clocked on CLK rising edges. The device enters Standby mode when CS is low, and supports polling of Ready/Busy status via DO after TCSL ≥250 ns.
It uses internal auto-erase-before-write logic and includes hardware-level power-on reset detection (VPOR = 1.5 V typical) that inhibits all operations below threshold. The absence of ORG pin confirms fixed x8 organization, eliminating external configuration logic and simplifying host firmware for byte-oriented access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit); provides compact nonvolatile storage for calibration data, device IDs, or small firmware parameters. |
| Supply voltage | 1.8–5.5 V; enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level-shifting. |
| Clock frequency | Up to 3 MHz at VCC ≥4.5 V; supports fast programming in high-throughput production environments. |
| Write cycle time | 6 ms typical (TWC); defines minimum interval between successive WRITE or ERASE commands. |
| Endurance | 1,000,000 erase/write cycles; ensures long-term reliability in field-updatable systems with frequent parameter writes. |
| Data retention | >200 years at 25°C; guarantees data integrity across product lifecycle without refresh. |
| Temperature range | –40°C to +85°C (Industrial grade); validated for operation in industrial control panels and automotive body electronics. |
Pinout & Package
93AA56AT-I/SN is housed in an 8-lead SOIC package (SN suffix), with standard pinout matching industry-standard Microwire EEPROMs. Pin 1 is CS, Pin 2 is CLK, Pin 3 is DI, Pin 4 is DO, Pin 5 is VSS, Pin 6 is NC (no internal connection), Pin 7 is NC, and Pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions to prevent bus contention. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data and clocks out read data. |
| DI (Pin 3) | Data Input | Receives Start bit, instruction opcodes, addresses, and write data; requires setup/hold timing per AC specs. |
| DO (Pin 4) | 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 (Pin 5) | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance for stable timing. |
| NC (Pin 6, Pin 7) | No internal connection | Unbonded pins; may be left floating or tied to ground per PCB layout best practices. |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; includes on-chip POR circuitry triggering at ~1.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or watchdog timers-host only waits for DO status or fixed TWC delay. |
| Auto-ERAL before WRAL | Ensures full array is erased prior to bulk write, preventing stale data corruption without host software intervention. |
| Power-on/off data protection | Hardware lockout below VPOR ≈1.5 V prevents partial writes during brown-out or power ramp, preserving memory integrity. |
| Sequential read mode | Enables continuous burst reads across multiple addresses with single CS assertion, reducing transaction overhead. |
| EWEN/EWDS security | Write-enable/disable commands prevent accidental overwrites; device powers up in EWDS state for default safety. |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients and tariff tables updated during factory programming and field maintenance. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via MCU SPI-like Microwire interface during boot and parameter updates. Use Value: 256 × 8-bit capacity matches typical calibration dataset size; 1M endurance supports lifetime field recalibration; 1.8–5.5 V range accommodates both battery-backed and line-powered meter designs. | Use Scenario: Retaining I/O mapping, ladder logic flags, and alarm thresholds across power cycles in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM interfaced to PLC's main MCU via 3-wire serial bus with deterministic timing. Use Value: Industrial temp range (–40°C to +85°C) ensures reliability in uncontrolled cabinet environments; WRAL command enables fast factory reset of all settings. |
| Medical Device Parameter Backup | Automotive Body Control Module Settings |
Use Scenario: Preserving user-adjustable therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable infusion pumps. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory holding FDA-required persistent settings, accessed during startup and runtime. Use Value: >200-year data retention meets medical device shelf-life requirements; power-on protection prevents corruption during battery swaps or low-VCC conditions. | Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in vehicle BCMs for personalized driver experience. IC Role / Device Role / Timing Role: Low-pin-count serial EEPROM integrated into BCM MCU subsystem for infrequent but critical setting storage. Use Value: SOIC-8 package enables easy rework and compatibility with existing automotive PCB footprints; 3-wire interface minimizes MCU GPIO usage. |
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/SN | Requires minimum 2.5 V VCC; lacks 1.8 V operation capability. | Not suitable for 1.8 V battery-powered systems where 93AA56AT-I/SN operates reliably. | Select 93AA56AT-I/SN for ultra-low-voltage designs; choose 93LC56AT-I/SN only if system VCC ≥2.5 V and legacy compatibility is required. |
| AT25020B-SSHL-T | SPI interface (4-wire), not Microwire; different instruction set and timing; 2.5–5.5 V supply. | Requires MCU SPI peripheral and firmware rewrite; incompatible pinout and protocol stack. | Use only when migrating to SPI-based architecture; not a drop-in replacement due to interface and command structure differences. |
Compared with 93LC56AT-I/SN, the 93AA56AT-I/SN extends low-voltage operation down to 1.8 V while retaining identical pinout and instruction timing-enabling direct substitution in battery-sensitive designs. Versus AT25020B-SSHL-T, it preserves Microwire compatibility and reduces GPIO count, avoiding SPI peripheral allocation and driver development.
Availability
93AA56AT-I/SN is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and medical device parameter backup requiring stable component supply across extended production lifecycles.
Supply support for 93AA56AT-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, 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 serial nonvolatile memory with minimal external components and broad voltage compatibility.
FAQ
What is the memory organization of the 93AA56AT-I/SN?
The 93AA56AT-I/SN has a fixed 256 × 8-bit (x8) organization. It does not include an ORG pin, distinguishing it from 'C' variants; this eliminates external configuration logic and ensures consistent byte-oriented addressing for host firmware.
Does the 93AA56AT-I/SN support 1.8 V operation?
Yes, the 93AA56AT-I/SN supports a VCC range of 1.8–5.5 V, making it compatible with modern low-voltage microcontrollers and battery-powered devices. Its VPOR threshold of ~1.5 V ensures robust power-on protection even at minimum operating voltage.
How is Ready/Busy status monitored on the 93AA56AT-I/SN?
Ready/Busy status is indicated on the DO pin: logic low means the device is busy executing an erase or write cycle; logic high indicates completion. To read status, CS must be brought high for ≥250 ns after TCSL, and DO must be sampled synchronously with CLK.
What package type is used for the 93AA56AT-I/SN?
The 93AA56AT-I/SN uses an 8-lead SOIC package (designated by the 'SN' suffix), with standard 150-mil width and industry-compatible footprint. Pin 1 is marked with a notch or laser dot, and the package is Pb-free and RoHS compliant.
Is the 93AA56AT-I/SN pin-compatible with other 93XX56 variants?
Yes-the 93AA56AT-I/SN shares identical SOIC-8 pinout with all 93XX56A/B/C variants in the same package (e.g., 93LC56AT-I/SN, 93C56AT-I/SN), including CS, CLK, DI, DO, VSS, NC, NC, VCC. However, functional compatibility depends on VCC range and ORG pin presence.
93AA56AT-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:
- 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-SOIC
93AA56AT-I/SN FAQ
1.How can I place an order for 93AA56AT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56AT-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 93AA56AT-I/SN reliable?
The price and inventory of 93AA56AT-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 93AA56AT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA56AT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56AT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56AT-I/SN?
93AA56AT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56AT-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 93AA56AT-I/SN?
For technical support, including 93AA56AT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56AT-I/SN requirements.
6.How does Aetrix verify that 93AA56AT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA56AT-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 93AA56AT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA56AT-I/SN?
All 93AA56AT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56AT-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 93AA56AT-I/SN part is unused and in its original packaging.
Return procedure for 93AA56AT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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