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Microchip Technology 93AA56A-I/ST
- Part No.:
- 93AA56A-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA56A-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,139
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Product details
Overview
93AA56A-I/ST 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 >200-year data retention. Used for parameter storage in embedded controllers, sensor calibration, and power-management configuration.
For engineers reviewing the 93AA56A-I/ST datasheet, 93AA56A-I/ST pinout, 93AA56A-I/ST application, or 93AA56A-I/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), TSSOP-8 package compatibility, 3 MHz max clock at 4.5–5.5 V, 6 ms typical write cycle time, and support for sequential read and WRAL/ERAL commands in resource-constrained systems.
Technical Context
The 93AA56A-I/ST implements a synchronous serial Microwire protocol with CS/CLK/DI/DO signals and no ORG pin-ensuring fixed 256 × 8-bit memory mapping. Its internal logic enforces power-on write protection, automatic erase-before-write, and status polling via DO during programming.
It operates across 1.8–5.5 V with guaranteed functionality down to 1.8 V, supports 1,000,000 erase/write cycles, and uses CMOS technology for ultra-low standby current (≤5 µA). The device enters EWDS mode on power-up and requires explicit EWEN before any erase or write operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit); fixed x8 organization eliminates need for external ORG control logic. |
| VCC range | 1.8 V to 5.5 V; enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI, DO); reduces PCB routing complexity vs. SPI/I²C. |
| Write cycle time | 6 ms typical (TWC); deterministic timing simplifies firmware wait-state handling and avoids polling overhead. |
| Data retention | >200 years at +25°C; ensures long-term reliability in unattended industrial equipment and metering applications. |
| Endurance | 1,000,000 erase/write cycles; supports frequent field updates in calibration or logging use cases. |
| Temperature grade | Industrial (−40°C to +85°C); qualified for deployment in factory automation, HVAC, and motor control environments. |
Pinout & Package
93AA56A-I/ST is packaged in an 8-lead TSSOP (ST) with 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, and Pb-free Matte Tin finish. Pin 1 is marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; deselects device into standby (≤5 µA ICCS). |
| 2 CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence for master flexibility. |
| 3 DI | Data Input | Receives Start bit, opcodes, addresses, and write data; compatible with shared DI/DO bus when series resistor applied. |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); high-Z when CS low or during non-read operations. |
| 5 VSS | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance for stable timing and noise immunity. |
| 6 NC | No Internal Connection | Unbonded pad; must be left floating or tied to VSS per layout best practice-no functional impact. |
| 7 NC | No Internal Connection | Unbonded pad; identical handling as Pin 6-no routing or connection required. |
| 8 VCC | Power Supply | Supplies core and I/O circuits; internal POR triggers at ~1.5 V; decoupling capacitor (0.1 µF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components and firmware delay loops-write completes autonomously in ≤6 ms. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial writes and data corruption without host intervention. |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delays-reduces average write latency and improves system responsiveness. |
| Power-on write protection | Hardware-enforced EWDS mode at power-up prevents accidental writes during brown-out or reset sequences. |
| Sequential read mode | Allows continuous address increment with single CS assertion-reduces transaction overhead for block reads. |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff tables, meter calibration coefficients, and tamper-event logs across 15+ year field life. IC Role / Device Role / Timing Role: Nonvolatile parameter register providing byte-addressable, low-power, long-retention storage interfaced to MCU via Microwire. Use Value: Eliminates battery-backed SRAM; supports 1M endurance for daily log updates and >200-year data integrity at ambient temperatures. |
Use Scenario: Retaining I/O configuration (e.g., analog input scaling, digital filter settings) after power cycle in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Configuration EEPROM accessed during boot to restore module behavior without host reprogramming. Use Value: Enables plug-and-play replacement; 1.8–5.5 V operation matches wide-input DC-DC rails; TSSOP-8 eases automated assembly. |
| White Goods Control Boards | Medical Diagnostic Sensors |
Use Scenario: Saving user preferences (temperature setpoints, cycle timers) and fault history in refrigerators and washing machines. IC Role / Device Role / Timing Role: Persistent memory for human-interface and safety-critical state variables in cost-sensitive consumer appliances. Use Value: Industrial temp grade ensures reliability across kitchen/laundry thermal environments; 3-wire interface minimizes MCU pin count. |
Use Scenario: Storing sensor-specific calibration constants (gain, offset, nonlinearity correction) in portable blood glucose or ECG monitors. IC Role / Device Role / Timing Role: Factory-programmed reference storage element read once at startup to configure ADC signal chain. Use Value: 256 × 8-bit capacity fits multi-point calibration tables; >200-year retention meets medical device shelf-life requirements. |
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/ST | Same 256 × 8-bit organization and TSSOP-8 package, but 2.5–5.5 V VCC range; lacks 1.8 V operation. | Not suitable for 1.8 V systems; otherwise drop-in for 3.3 V/5 V designs requiring same instruction set and timing. | Select 93LC56A-I/ST only if supply is ≥2.5 V and lower voltage margin is unnecessary. |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, but no ERAL/WRAL commands; uses Write Enable (WREN) instead of EWEN/EWDS. | Requires SPI-capable MCU; lacks auto-erase-all and write-all primitives-host must manage sector erases individually. | Choose AT25020B-SSHL-T only when SPI is preferred over Microwire and full-array erase/write is handled in firmware. |
Compared with 93LC56A-I/ST, the 93AA56A-I/ST extends low-voltage operation to 1.8 V while retaining identical pinout and command set; versus AT25020B-SSHL-T, it offers hardware-accelerated ERAL/WRAL and simpler 3-wire control at the cost of interface standardization.
Availability
93AA56A-I/ST is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, and white goods control boards requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA56A-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs-including the 93AA56A-I/ST-are designed for low-power, nonvolatile data storage in space- and cost-constrained embedded systems where reliability, wide VCC range, and simple serial interface are critical.
FAQ
What is the memory organization of the 93AA56A-I/ST?
The 93AA56A-I/ST has a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin. Unlike 'C' variants, it does not support word-size selection-ensuring consistent 8-bit data transfers without external configuration logic. This simplifies design for systems requiring byte-level access only.
Does the 93AA56A-I/ST require an external pull-up resistor on the DO pin?
No, the 93AA56A-I/ST does not require an external pull-up on DO. The pin actively drives high/low during read or Ready/Busy status reporting and enters high-impedance (High-Z) when inactive. A series resistor is recommended only if DI and DO are shorted on a shared bus to prevent contention.
How does the 93AA56A-I/ST handle power loss during a write cycle?
The 93AA56A-I/ST incorporates power-on/off data protection circuitry. If VCC drops below ~1.5 V during erase/write, the internal state machine aborts the operation and preserves existing data. No data corruption occurs, and the device resumes normal operation after stable VCC is restored.
Can the 93AA56A-I/ST be used with a 1.8 V microcontroller?
Yes, the 93AA56A-I/ST is fully specified for 1.8 V operation: VIH1 = 2.0 V (min) and VIL1 = 0.8 V (max) at VCC = 1.8 V, and FCLK supports 1 MHz minimum. It interfaces directly with 1.8 V MCUs without level translation, making it ideal for ultra-low-power portable devices.
What is the purpose of the NC pins on the 93AA56A-I/ST TSSOP-8 package?
Pins 6 and 7 on the 93AA56A-I/ST TSSOP-8 package are No Connect (NC) terminals-unbonded and electrically isolated. They must be left floating or tied to VSS per Microchip's layout guidance; neither pin affects functionality, timing, or reliability when properly handled.
93AA56A-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:
- 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-TSSOP
93AA56A-I/ST FAQ
1.How can I place an order for 93AA56A-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56A-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 93AA56A-I/ST reliable?
The price and inventory of 93AA56A-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 93AA56A-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA56A-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56A-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56A-I/ST?
93AA56A-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56A-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 93AA56A-I/ST?
For technical support, including 93AA56A-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56A-I/ST requirements.
6.How does Aetrix verify that 93AA56A-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA56A-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 93AA56A-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA56A-I/ST?
All 93AA56A-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56A-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 93AA56A-I/ST part is unused and in its original packaging.
Return procedure for 93AA56A-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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