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Microchip Technology 93AA56BT-I/ST
- Part No.:
- 93AA56BT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA56BT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,140
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Product details
Overview
93AA56BT-I/ST 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, industrial temperature rating (–40°C to +85°C), and 1 million erase/write cycles. It operates in 8-pin TSSOP package and supports Ready/Busy status polling via DO pin for embedded system configuration storage.
For engineers reviewing the 93AA56BT-I/ST datasheet, 93AA56BT-I/ST pinout, 93AA56BT-I/ST application, or 93AA56BT-I/ST equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), self-timed write/erase, power-on data protection, and compatibility with microcontroller SPI-like serial interfaces requiring minimal GPIO overhead.
Technical Context
The 93AA56BT-I/ST implements a synchronous serial Microwire protocol with CS, CLK, DI, and DO signals - no ORG pin required due to fixed 8-bit word size. It uses internal auto-erase before write and supports ERAL (Erase All) and WRAL (Write All) commands with full 256-byte address space access.
Its timing is voltage-dependent: max clock frequency is 3 MHz at VCC ≥ 4.5 V, 2 MHz at 2.5 V ≤ VCC < 4.5 V, and 1 MHz at 1.8 V ≤ VCC < 2.5 V. Standby current is ≤ 5 µA, and write current peaks at 2 mA (VCC = 2.5 V) or 500 µA (VCC = 5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin needed; direct byte-addressable storage |
| VCC Range | 1.8 V to 5.5 V - supports wide-range battery-powered and mixed-voltage MCU systems |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration or firmware parameter logging |
| Data Retention | 200 years at 25°C - ensures nonvolatile storage integrity across product lifecycle without refresh |
| Interface | 3-wire Microwire-compatible (CS/CLK/DI/DO) - requires only 4 GPIOs; no MISO/MOSI naming conflict |
| Write Cycle Time | 6 ms typical - deterministic self-timed programming; eliminates need for external delay timers |
| Operating Temp | –40°C to +85°C (Industrial grade) - qualified for industrial control, metering, and automotive body electronics |
Pinout & Package
8-pin TSSOP (ST) package: 3.0 mm × 4.4 mm, 0.65 mm pitch, surface-mount, Pb-free Matte Tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge |
| 2 - CLK | Serial Clock | Synchronizes all data transfers; rising-edge sampling for DI/DO; stoppable mid-sequence |
| 3 - DI | Data Input | Receives Start bit, opcodes, addresses, and write data; high-impedance when not selected |
| 4 - DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall; requires CS high ≥250 ns to poll status |
| 5 - VSS | Ground | Reference return path; must be low-impedance for stable read/write margins |
| 6 - NC | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 - NC | No Connect | Internally unconnected; same handling as Pin 6 |
| 8 - VCC | Power Supply | 1.8–5.5 V input; includes on-chip POR circuitry triggering at ~1.5 V; powers internal logic and memory array |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing components; 6 ms typical cycle time ensures predictable firmware flow control |
| Power-On/Off Data Protection | Hardware POR disables writes below ~1.5 V; prevents corruption during brown-out or hot-plug events |
| Ready/Busy Status via DO | Enables polling-based write completion detection without interrupt lines or additional pins |
| Sequential Read Mode | Allows continuous 256-byte burst reads with single CS assertion - reduces transaction overhead by >40% |
| 100% Tested AC/DC Parameters | Guarantees timing compliance across full VCC/temp range - no derating required in design margining |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients, tariff tables, and tamper logs in utility smart meters operating on battery backup. IC Role / Device Role / Timing Role: Nonvolatile parameter register holding factory-trimmed ADC gain/offset and real-time energy accumulation history. Use Value: 200-year data retention and 1M endurance ensure accuracy over 15+ year field deployment without recalibration. | Use Scenario: Saving user-defined I/O mapping, PID loop parameters, and alarm thresholds in DIN-rail programmable logic controllers. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced directly to ARM Cortex-M host MCU via GPIO-banged Microwire. Use Value: 1.8 V operation enables direct connection to low-power MCU I/O banks without level shifters. |
| Automotive Body Control Module | Medical Infusion Pump Settings |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in automotive BCMs with 12 V supply regulation. IC Role / Device Role / Timing Role: Dedicated 8-bit serial EEPROM providing fast, deterministic write access for user preference persistence. Use Value: –40°C to +85°C rating and 6 ms write time meet AEC-Q100 Class 2 thermal and timing requirements. | Use Scenario: Retaining drug library, dose limits, and clinician audit trails in battery-powered portable infusion pumps. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory storing FDA-mandated operational parameters and event logs. Use Value: Power-on data protection prevents corruption during battery swaps or sudden power loss during therapy delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-I/ST | Same 256 × 8-bit organization and TSSOP-8 package, but 2.5–5.5 V VCC range; lacks 1.8 V support | Not suitable for ultra-low-voltage systems (e.g., coin-cell IoT sensors); otherwise functionally identical | Select 93LC56BT-I/ST only if system VCC never drops below 2.5 V and 1.8 V operation is unnecessary |
| AT25020B-SSHL-T | 2 Kbit SPI EEPROM (8-pin SOIC), 1.8–5.5 V, but uses standard SPI (4-wire) instead of Microwire; no DO status polling | Requires separate BUSY pin or software timeout; incompatible instruction set; needs different driver code | Choose only if existing SPI infrastructure exists and Microwire protocol compatibility is not required |
Compared with 93LC56BT-I/ST, the 93AA56BT-I/ST adds 1.8 V operation for battery-sensitive designs; compared with AT25020B-SSHL-T, it retains hardware-ready signaling and Microwire simplicity at the cost of vendor-specific command structure.
Availability
93AA56BT-I/ST is available at Aetrix Electronics and suitable for industrial control systems, medical device configuration storage, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93AA56BT-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 was designed specifically for cost-sensitive, low-power embedded systems needing reliable, pin-efficient serial EEPROM with robust data integrity features - especially where Microwire compatibility and wide VCC range are critical.
FAQ
What is the memory organization of the 93AA56BT-I/ST?
The 93AA56BT-I/ST has a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin - it is an 'A' version device. This means it always operates in 8-bit word mode, eliminating external configuration logic and simplifying firmware implementation for byte-level access.
Does the 93AA56BT-I/ST require an external pull-up resistor on the DO pin?
No, the 93AA56BT-I/ST does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy polling and enters High-Z when deselected. However, a 10 kΩ pull-down on CS is recommended per Microchip's application guidance to prevent spurious activation.
Can the 93AA56BT-I/ST be used with a 3.3 V microcontroller without level shifting?
Yes, the 93AA56BT-I/ST is fully compatible with 3.3 V MCUs: its VIH1 threshold is 2.0 V (min) at VCC ≥ 2.7 V, and VOH1 is ≥ 2.4 V driving 400 µA - meeting standard 3.3 V LVTTL logic levels without translation.
How is write protection implemented on the 93AA56BT-I/ST?
Write protection is implemented via EWEN/EWDS commands: the device powers up in EWDS (Erase/Write Disable) mode. An EWEN command must precede any ERASE or WRITE operation, and issuing EWDS afterward re-enables hardware lockout - preventing accidental writes during noise events or reset glitches.
What package type does the 93AA56BT-I/ST use, and is it RoHS compliant?
The 93AA56BT-I/ST uses an 8-pin TSSOP (Thin Shrink Small Outline Package) with 3.0 mm × 4.4 mm body and 0.65 mm lead pitch. It is Pb-free and RoHS compliant, with Matte Tin (Sn) finish per JEDEC standards, and marked "ST" in Microchip's package coding system.
93AA56BT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- 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
93AA56BT-I/ST FAQ
1.How can I place an order for 93AA56BT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56BT-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 93AA56BT-I/ST reliable?
The price and inventory of 93AA56BT-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 93AA56BT-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA56BT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56BT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56BT-I/ST?
93AA56BT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56BT-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 93AA56BT-I/ST?
For technical support, including 93AA56BT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56BT-I/ST requirements.
6.How does Aetrix verify that 93AA56BT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA56BT-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 93AA56BT-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA56BT-I/ST?
All 93AA56BT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56BT-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 93AA56BT-I/ST part is unused and in its original packaging.
Return procedure for 93AA56BT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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