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Microchip Technology 93AA56-I/SN
- Part No.:
- 93AA56-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA56-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,778
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Product details
Overview
93AA56-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 erase-all-before-write-all (ERAL/WRAL), and Ready/Busy status signaling via DO pin - used for nonvolatile parameter storage in embedded microcontroller systems.
For engineers reviewing the 93AA56-I/SN datasheet, 93AA56-I/SN pinout, 93AA56-I/SN application, or 93AA56-I/SN equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), 1 million erase/write endurance, >200-year data retention, and compatibility with low-power, space-constrained designs requiring robust serial NV memory.
Technical Context
The 93AA56-I/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO signals. It operates without an ORG pin, fixing memory organization to 256 words × 8 bits. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit (CS high + DI high on CLK rising edge) followed by opcode, address, and data bits clocked on CLK rising edges.
Internal power-on reset and voltage-detect circuitry (VPOR = 1.5 V typical) disable write operations below VCC threshold. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during programming - pulled low during active erase/write, high when complete, and High-Z when CS is low or idle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit organization; fixed, no ORG pin) |
| VCC range | 1.8 V to 5.5 V - supports single-supply operation across battery-powered and 3.3/5 V logic systems |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware or calibration updates in field-deployed devices |
| Data retention | Greater than 200 years at 25°C - ensures long-term reliability in unattended or maintenance-free applications |
| Write cycle time | 6 ms max (TWC) - defines minimum interval between successive write commands; impacts real-time logging latency |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; no I²C pull-ups or UART overhead required |
| Temp range | Industrial: –40°C to +85°C - qualified for use in automotive ECUs, industrial controllers, and outdoor sensors |
Pinout & Package
93AA56-I/SN is supplied in 8-lead SOIC package (SN suffix), with lead finish Pb-free (Matte Tin). 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; device enters Standby mode when low; must be held low ≥250 ns between instructions |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data and clocks out DO data |
| DI (Pin 3) | Data Input | Receives Start bit, instruction opcodes, addresses, and write data; tied high with CS to initiate command |
| DO (Pin 4) | Data Output / Status | Outputs read data; indicates Ready (high) or Busy (low) during erase/write; High-Z when CS low or idle |
| VSS (Pin 5) | Ground | Reference return path for all signals and internal circuitry; must be low-impedance |
| NC (Pin 6) | No Connection | Not bonded internally; must remain unconnected or tied to VSS per layout best practice |
| NC (Pin 7) | No Connection | Not bonded internally; must remain unconnected or tied to VSS per layout best practice |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; includes internal voltage detect (VPOR = 1.5 V) for data protection |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control or polling delay loops - simplifies firmware driver implementation |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write - prevents data corruption when overwriting entire memory |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR = 1.5 V - prevents inadvertent writes during brown-out or power ramp |
| Ready/Busy status on DO | Enables efficient polling-based command completion detection without additional pins or interrupts |
| Industry-standard 3-wire serial I/O | Reduces PCB routing complexity vs. parallel or 4-wire SPI; compatible with legacy Microwire host controllers |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients, tariff tables, and tamper-event logs in electricity/water/gas meters operating for 15+ years without maintenance. IC Role / Device Role / Timing Role: Nonvolatile parameter storage IC interfacing directly with metering SoC via 3-wire Microwire; retains data through power loss and thermal cycling. Use Value: 200-year data retention and 1M endurance ensure calibration integrity across product lifetime; 1.8–5.5 V operation supports wide-input DC-DC supplies. | Use Scenario: Holding user-defined I/O mapping, PID loop parameters, and alarm thresholds in DIN-rail mounted programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Serial configuration EEPROM accessed during PLC boot and runtime reconfiguration; withstands repeated parameter updates during commissioning. Use Value: Industrial temp rating (–40°C to +85°C) and robust ESD protection (≥4 kV) ensure reliability in electrically noisy plant-floor environments. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Settings |
Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in BCMs where EEPROM must survive automotive qualification (AEC-Q100 Class 2 not required but design-aligned). IC Role / Device Role / Timing Role: Dedicated 8-bit serial NV memory co-located with MCU; accessed via GPIO bit-banged Microwire or hardware peripheral. Use Value: Fixed 8-bit organization eliminates ORG pin routing complexity; low standby current (<5 µA) minimizes battery drain in always-on modules. | Use Scenario: Storing drug library definitions, flow-rate limits, and clinician access codes in FDA-cleared infusion pumps requiring traceable, failure-resistant memory. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory storing immutable operational constraints; verified via CRC checksum on each read. Use Value: >200-year retention and 1M endurance meet IEC 62304 software safety requirements for Class C medical devices; Pb-free RoHS compliance supports global regulatory filings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56A-I/SN | VCC range 2.5–5.5 V; identical 256 × 8-bit organization, pinout, and instruction set | Not suitable for 1.8 V systems; requires higher minimum supply voltage | Select if system VCC never drops below 2.5 V and legacy 93LC family qualification is preferred |
| AT25020B-MAHL-T | 2 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin - uses WIP flag in status register | Requires SPI peripheral instead of Microwire; lacks direct DO-status polling; higher throughput but more complex driver | Select for new designs prioritizing speed and SPI ecosystem compatibility over pin-count minimization |
Compared with 93LC56A-I/SN, the 93AA56-I/SN supports lower-voltage operation down to 1.8 V, enabling direct integration into ultra-low-power sensor nodes. Compared with AT25020B-MAHL-T, it offers simpler 3-wire timing and hardware-ready/busy signaling - reducing firmware overhead in resource-constrained MCUs.
Availability
93AA56-I/SN is available at Aetrix Electronics and suitable for industrial control, smart metering, and automotive body electronics requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA56-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, FPGA, and memory solutions, headquartered in Chandler, Arizona.
The 93XX series EEPROMs - including the 93AA56-I/SN - were designed for cost-sensitive, low-power embedded systems needing reliable, easy-to-integrate serial nonvolatile memory with minimal external components.
FAQ
What is the memory organization of the 93AA56-I/SN?
The 93AA56-I/SN has a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin. Unlike 'C' variants, it does not support word-size selection - it is dedicated to 8-bit serial communication. This simplifies PCB layout by eliminating ORG pin routing and external logic, and ensures deterministic addressing behavior across all operating conditions.
Does the 93AA56-I/SN require an external pull-up resistor on the DO line?
No, the 93AA56-I/SN does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z state when inactive. However, if DI and DO are shorted (shared bus), a current-limiting resistor (e.g., 10 kΩ) is recommended to prevent bus conflict during the dummy-zero phase of READ operations.
How is write protection implemented on the 93AA56-I/SN?
Write protection on the 93AA56-I/SN is implemented via three hardware and firmware mechanisms: (1) Power-on reset inhibits writes below VPOR = 1.5 V; (2) Erase/Write Disable (EWDS) mode is default at power-up; (3) An explicit EWEN instruction must precede any ERASE or WRITE command. After programming, issuing EWDS restores protection - preventing accidental overwrites during normal operation.
What is the maximum clock frequency supported by the 93AA56-I/SN at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93AA56-I/SN supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1, FCLK). This corresponds to a minimum clock period of 500 ns, with TCKH ≥ 250 ns and TCKL ≥ 200 ns. Exceeding this frequency risks setup/hold violations and command rejection.
Can the 93AA56-I/SN be used in place of a 93C56A-I/SN?
No - the 93AA56-I/SN is not a drop-in replacement for the 93C56A-I/SN. While both are 256 × 8-bit EEPROMs, the 93C56A requires VCC ≥ 4.5 V for full functionality (including ERAL/WRAL), whereas the 93AA56-I/SN operates down to 1.8 V. Their instruction timing differs (e.g., TWC = 2 ms for 93C vs. 6 ms for 93AA), and 93C56A lacks VPOR = 1.5 V protection. Firmware and power design must be validated separately.
93AA56-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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93AA56-I/SN FAQ
1.How can I place an order for 93AA56-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56-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 93AA56-I/SN reliable?
The price and inventory of 93AA56-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 93AA56-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA56-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56-I/SN?
93AA56-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56-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 93AA56-I/SN?
For technical support, including 93AA56-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56-I/SN requirements.
6.How does Aetrix verify that 93AA56-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA56-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 93AA56-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA56-I/SN?
All 93AA56-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56-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 93AA56-I/SN part is unused and in its original packaging.
Return procedure for 93AA56-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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