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Microchip Technology 93AA56B-I/ST
- Part No.:
- 93AA56B-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA56B-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,286
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Product details
Overview
93AA56B-I/ST from Microchip Technology Inc. is a 2 Kbit (128 × 16-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, and Ready/Busy status via DO pin. Used in microcontroller-based systems for parameter storage, calibration data retention, and configuration memory.
For engineers reviewing the 93AA56B-I/ST datasheet, 93AA56B-I/ST pinout, 93AA56B-I/ST application, or 93AA56B-I/ST equivalent, key selection criteria include its dedicated 16-bit organization (no ORG pin), TSSOP-8 package, 3 MHz max clock frequency at 4.5–5.5 V, 6 ms typical write cycle time, and 1 million endurance cycles with >200-year data retention.
Technical Context
The 93AA56B-I/ST implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO lines - no ORG pin required, fixed 128-word × 16-bit memory map. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are executed via rising-edge clocked bit streams starting with a Start condition (CS high + DI high on CLK edge).
Internal power-on reset and voltage-detect circuitry (VPOR = 1.5 V typical) disable programming below VCC threshold. Ready/Busy polling is supported via DO pin after minimum TCSL (250 ns), with DO low indicating active erase/write and DO high confirming completion. Standby current is ≤1 µA at I-temp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 × 16-bit) - fixed x16 organization eliminates need for external word-size logic |
| VCC range | 1.8 V to 5.5 V - supports single-supply operation across 1.8 V, 3.3 V, and 5 V systems |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no address bus required |
| Write cycle time | 6 ms typical - enables deterministic firmware timing for non-blocking status polling |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent field-updatable calibration or logging |
| Data retention | >200 years at 25°C - ensures long-term reliability in unpowered storage applications |
| Temp range | –40°C to +85°C (Industrial) - validated for embedded control, industrial sensors, and automotive body electronics |
Pinout & Package
93AA56B-I/ST is housed in an 8-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; deselects device into standby mode |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; supports stop/resume; no clock required during self-timed write |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied high to initiate Start condition |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS low or after status read |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; requires low-impedance connection to system GND plane |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (NC) | No Connect | Internally unconnected; identical handling as Pin 6 |
| 8 (VCC) | Power Supply | Supplies core and interface logic; bypass capacitor (0.1 µF) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components and firmware delay loops; cycle completes autonomously after CS fall (93AA) |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing partial-data corruption without host intervention |
| Power-on/off data protection | Hardware VPOR circuit blocks writes below 1.5 V, preventing inadvertent writes during brown-out or power ramp |
| Ready/Busy status on DO | Enables efficient polling without dedicated status lines; reduces pin count and simplifies host driver design |
| Sequential read mode | Allows continuous address increment with CS held high - ideal for reading multi-byte configuration blocks |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients, tariff tables, and firmware version metadata across power cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter memory interfaced to MCU via Microwire; accessed during boot and field update routines. Use Value: 1M endurance and >200-year retention ensure accuracy over 15+ year meter lifetime without backup battery. | Use Scenario: Holding user-defined I/O mapping, ladder logic parameters, and alarm thresholds in modular PLC controllers. IC Role / Device Role / Timing Role: Dedicated 16-bit serial EEPROM providing fast, deterministic access to configuration registers. Use Value: Fixed x16 organization matches common PLC register width, reducing software bit-packing overhead. |
| Automotive Body Control Module | Medical Device Usage Log |
Use Scenario: Recording seat position presets, mirror angles, and lighting profiles in BCMs for personalized driver settings. IC Role / Device Role / Timing Role: Low-power serial EEPROM operating from 12 V rail via LDO; accessed during ignition-on initialization. Use Value: 1.8–5.5 V range accommodates wide-input LDO output; –40°C to +85°C rating meets automotive interior requirements. | Use Scenario: Logging device usage hours, sterilization cycles, and error events in Class II medical equipment for regulatory traceability. IC Role / Device Role / Timing Role: Tamper-resistant, long-life memory storing auditable event timestamps and counters. Use Value: Hardware write-protection (EWDS/EWEN) prevents accidental log overwrite; RoHS compliance satisfies medical supply chain mandates. |
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/ST | Same 128×16-bit organization, but 2.5–5.5 V VCC range; lacks 1.8 V support | Not suitable for 1.8 V systems; otherwise pin- and function-compatible | Select if system VCC ≥2.5 V and cost optimization is prioritized over ultra-low-voltage operation |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256×8), 1.8–5.5 V, 20 MHz max clock | Requires additional CS line and SPI-capable MCU peripheral; higher throughput but different protocol stack | Choose for designs already using SPI peripherals and requiring faster random access than Microwire permits |
Compared with 93LC56B-I/ST, the 93AA56B-I/ST extends low-voltage operation down to 1.8 V while retaining identical pinout and instruction set; versus AT25020B-SSHL-T, it trades SPI speed and flexibility for reduced pin count and simpler firmware in resource-constrained MCUs.
Availability
93AA56B-I/ST is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for 93AA56B-I/ST 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 93AAxx series targets cost-sensitive, low-power embedded systems needing reliable, small-footprint nonvolatile memory - optimized for simplicity, long-term data integrity, and broad voltage compatibility in industrial and consumer applications.
FAQ
What is the memory organization of the 93AA56B-I/ST?
The 93AA56B-I/ST has a fixed 128-word × 16-bit (2 Kbit) organization. Unlike 'C' variants, it does not feature an ORG pin - the x16 configuration is hardwired, eliminating external logic for word-size selection and simplifying PCB layout and firmware design. This matches common 16-bit register widths in microcontrollers and digital signal processors.
Does the 93AA56B-I/ST require an external pull-up resistor on the DO pin?
No, the 93AA56B-I/ST 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 when deselected or idle. 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 93AA56B-I/ST?
Write protection on the 93AA56B-I/ST uses hardware-enabled Erase/Write Disable (EWDS) and Enable (EWEN) commands. The device powers up in EWDS mode, blocking all erase/write operations until EWEN is issued. After each write, executing EWDS restores protection. This provides deterministic, firmware-controlled security against accidental overwrites without relying on voltage-level detection alone.
What is the maximum clock frequency supported by the 93AA56B-I/ST at 3.3 V?
At VCC = 3.3 V (within the 2.5–5.5 V range), the 93AA56B-I/ST supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This ensures reliable setup/hold timing for DI and CS signals under typical industrial operating conditions and allows robust communication even with marginal PCB trace lengths or noise margins.
Can the 93AA56B-I/ST be used in place of the 93AA56A-I/ST?
No - the 93AA56B-I/ST and 93AA56A-I/ST are not interchangeable without firmware and system-level validation. While both share the same 93AA prefix and TSSOP-8 package, the 93AA56A-I/ST uses an 8-bit (256×8) organization and outputs 8-bit data per READ, whereas the 93AA56B-I/ST outputs 16-bit data. Software must be modified to handle word-width differences, address mapping, and instruction timing.
93AA56B-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
93AA56B-I/ST FAQ
1.How can I place an order for 93AA56B-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56B-I/ST 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 93AA56B-I/ST reliable?
The price and inventory of 93AA56B-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA56B-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA56B-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56B-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56B-I/ST?
93AA56B-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56B-I/ST 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 93AA56B-I/ST?
For technical support, including 93AA56B-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56B-I/ST requirements.
6.How does Aetrix verify that 93AA56B-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA56B-I/ST 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 93AA56B-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA56B-I/ST?
All 93AA56B-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56B-I/ST, 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 93AA56B-I/ST part is unused and in its original packaging.
Return procedure for 93AA56B-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA56B-I/ST Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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