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Microchip Technology 93AA56CT-I/ST
- Part No.:
- 93AA56CT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93AA56CT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
93AA56CT-I/ST from Microchip Technology Inc. is a 2 Kbit 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 256 × 8-bit organization (no ORG pin), 1,000,000 erase/write cycles, >200-year data retention, and automatic erase-before-write functionality. Used in microcontroller-based systems for parameter storage, calibration data, and configuration settings.
For engineers reviewing the 93AA56CT-I/ST datasheet, 93AA56CT-I/ST pinout, 93AA56CT-I/ST application, or 93AA56CT-I/ST equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), TSSOP-8 package footprint, 8-bit x256 memory map, Ready/Busy status signaling via DO pin, and support for sequential read and WRAL/ERAL bulk operations.
Technical Context
The 93AA56CT-I/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It uses self-timed internal erase-and-write cycles requiring no external timing control, and includes power-on/off data protection circuitry that inhibits all operations below ~1.5 V VCC. The device enters Erase/Write Disable (EWDS) mode at power-up and requires an explicit EWEN command before programming.
Memory access follows a start-bit–opcode–address–data sequence clocked on rising CLK edges. Read operations output 8-bit data with a leading dummy zero; write and erase commands trigger internal auto-erase prior to programming. The DO pin serves dual function: data output during reads and Ready/Busy status indicator during erase/write cycles when CS is reasserted after ≥250 ns low time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit = 256 × 8-bit organization; fixed x8 mode with no ORG pin dependency |
| Supply voltage | 1.8 V to 5.5 V; supports wide-range battery-powered and mixed-voltage embedded systems |
| Endurance | 1,000,000 erase/write cycles; enables long-term field updates in firmware-configurable devices |
| Data retention | >200 years at 25°C; ensures nonvolatile storage integrity across product lifecycle without refresh |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); minimal GPIO usage, no address bus required |
| Access time | Max 400 ns DO delay (TPD) at 1.8 V; meets real-time polling requirements for status checking |
| Operating temp | –40°C to +85°C (Industrial grade); validated for use in automotive ECUs, industrial controllers, and metering |
Pinout & Package
93AA56CT-I/ST is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, lead-free Matte Tin finish, and Pb-free/RoHS compliance. Pin 1 is marked by laser indentation per JEDEC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby mode |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; supports variable clock frequency up to 3 MHz (at VCC ≥4.5 V) |
| 3 (DI) | Data Input | Accepts start bit, opcode, address, and write data; high-impedance when not selected |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS is low |
| 5 (VSS) | Ground | Reference return path for all digital and internal analog circuitry |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (ORG) | Organization Select | Not used on 'A' version; NC on 93AA56CT-I/ST - device permanently configured for 8-bit operation |
| 8 (VCC) | Power Supply | Core logic and memory array supply; includes on-chip voltage detect (~1.5 V threshold) for data protection |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delays; cycle completes autonomously in ≤6 ms |
| Automatic ERAL before WRAL | Ensures full-array readiness before bulk write; prevents partial-program corruption without host intervention |
| Ready/Busy status on DO | Enables efficient polling instead of fixed-delay waits; reduces CPU overhead and improves system responsiveness |
| Power-on/off data protection | Hardware lockout below ~1.5 V VCC prevents inadvertent writes during brown-out or power ramp conditions |
| Sequential read mode | Allows continuous address increment with single CS assertion; simplifies firmware for block data retrieval |
Applications
| Smart Energy Meters | Industrial PLC Modules |
|---|---|
Use Scenario: Storing tariff schedules, meter calibration coefficients, and tamper-event logs over 15+ year field life. IC Role / Device Role / Timing Role: Nonvolatile configuration and event logging memory interfaced to MCU via Microwire. Use Value: 200-year data retention and 1M endurance ensure reliable long-term storage without periodic refresh or backup power. | Use Scenario: Holding I/O mapping tables, PID tuning parameters, and firmware update flags in modular automation controllers. IC Role / Device Role / Timing Role: Parameter EEPROM accessed during boot and runtime by ARM Cortex-M host processor. Use Value: 1.8–5.5 V operation allows direct connection to 3.3 V or 5 V logic rails; TSSOP-8 footprint fits dense PCB layouts. |
| Automotive Body Control Units | Medical Diagnostic Devices |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and fault history in 12 V vehicle subsystems with LDO-regulated 3.3 V supply. IC Role / Device Role / Timing Role: Low-power serial EEPROM supporting infrequent but critical write operations under EMI-prone conditions. Use Value: Industrial temperature range (–40°C to +85°C) and robust ESD protection (≥4 kV) meet automotive environmental requirements. | Use Scenario: Retaining patient-specific calibration data, sensor offset values, and regulatory audit logs in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, traceable nonvolatile memory for FDA-compliant data integrity and revision tracking. Use Value: RoHS-compliant Pb-free packaging and documented 200-year retention support medical device lifecycle validation. |
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/ST | Same 256×8 organization and TSSOP-8 package, but 2.5–5.5 V VCC range; lacks 1.8 V capability | Suitable where system rail is ≥2.5 V only; not usable in 1.8 V logic domains | Select 93LC56AT-I/ST if supply is stable ≥2.5 V and lower voltage operation is unnecessary |
| AT25020B-SSHL-T | 2 Kbit SPI interface (4-wire), 1.8–5.5 V, SOIC-8; no Ready/Busy pin - relies on WIP flag polling | Requires SPI master instead of Microwire; different instruction set and timing model | Choose AT25020B-SSHL-T only when migrating to SPI architecture or needing higher clock rates (up to 20 MHz) |
Compared with 93LC56AT-I/ST, the 93AA56CT-I/ST extends low-voltage operation down to 1.8 V while retaining identical pinout and instruction set; versus AT25020B-SSHL-T, it offers hardware Ready/Busy signaling and simpler 3-wire interface at the cost of lower maximum clock speed.
Availability
93AA56CT-I/ST is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC modules, and automotive body control units requiring stable component supply, long-term data integrity, and industrial-grade temperature performance.
Supply support for 93AA56CT-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs were designed for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and simple firmware integration - especially where Microwire compatibility and hardware status signaling are valued.
FAQ
What is the memory organization of the 93AA56CT-I/ST?
The 93AA56CT-I/ST is a fixed 256 × 8-bit (2 Kbit) EEPROM with no ORG pin functionality - it operates exclusively in x8 mode. Unlike 'C' variants, the 'A' suffix indicates dedicated 8-bit communication and absence of the ORG pin, making memory addressing and data framing deterministic and simplified for host firmware.
Does the 93AA56CT-I/ST require an external pull-up resistor on the DO pin?
No, the 93AA56CT-I/ST does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when CS is low or during non-read operations. A pull-up may cause bus contention if DI and DO are shorted; Microchip recommends a series resistor if shared-bus configuration is used.
What is the minimum VCC voltage at which the 93AA56CT-I/ST guarantees data protection?
The 93AA56CT-I/ST guarantees data protection below a typical VCC threshold of 1.5 V, as specified in its electrical characteristics table (Parameter D11, VPOR). Below this level, all write, erase, and EWEN operations are hardware-inhibited to prevent corruption during power-up/down transitions.
Can the 93AA56CT-I/ST be used in a 3.3 V system with a 5 V-tolerant microcontroller?
Yes - the 93AA56CT-I/ST operates natively from 1.8 V to 5.5 V and has input thresholds defined relative to VCC (e.g., VIH1 = 2.0 V min at VCC ≥2.7 V). When powered at 3.3 V, its inputs accept 3.3 V logic levels, and outputs swing rail-to-rail. No level-shifting is needed for direct interface with 3.3 V or 5 V microcontrollers.
How does the 93AA56CT-I/ST indicate completion of an erase or write operation?
The 93AA56CT-I/ST uses the DO pin as a Ready/Busy indicator: DO = low indicates ongoing erase/write; DO = high signals completion. This requires reasserting CS high after ≥250 ns low time (TCSL) to sample status. The device also supports automatic polling without fixed delays, reducing firmware complexity versus timeout-based methods.
93AA56CT-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:
- 256 x 8, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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
93AA56CT-I/ST FAQ
1.How can I place an order for 93AA56CT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA56CT-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 93AA56CT-I/ST reliable?
The price and inventory of 93AA56CT-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 93AA56CT-I/ST is usually 5 days.
3.What payment methods are accepted for 93AA56CT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA56CT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA56CT-I/ST?
93AA56CT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA56CT-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 93AA56CT-I/ST?
For technical support, including 93AA56CT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA56CT-I/ST requirements.
6.How does Aetrix verify that 93AA56CT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93AA56CT-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 93AA56CT-I/ST meets industry standards.
7.What is the process for return or replacement of 93AA56CT-I/ST?
All 93AA56CT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93AA56CT-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 93AA56CT-I/ST part is unused and in its original packaging.
Return procedure for 93AA56CT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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