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Microchip Technology 93C56CT-I/MC
- Part No.:
- 93C56CT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93C56CT-I/MC.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,594
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Product details
Overview
93C56CT-I/MC from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, industrial temperature grade (–40°C to +85°C), and 8-lead 2×3 DFN package. It features self-timed erase/write cycles, automatic ERAL before WRAL, and power-on/off data protection - used for configuration storage in embedded controllers and sensor calibration modules.
For engineers reviewing the 93C56CT-I/MC datasheet, 93C56CT-I/MC pinout, 93C56CT-I/MC application, or 93C56CT-I/MC equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 2 ms write cycle time, 1 million endurance cycles, 200-year data retention, and compatibility with legacy Microwire host controllers requiring minimal I/O overhead.
Technical Context
The 93C56CT-I/MC implements a synchronous serial interface with CS, CLK, and DI/DO pins, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its fixed 8-bit organization eliminates ORG pin dependency, simplifying PCB layout versus C-variant parts.
It uses internal auto-erase-before-write logic and provides Ready/Busy status via DO pin polling during programming. Power-on reset circuitry disables writes below 3.8 V, and EWEN/EWDS commands enforce explicit write-enable control for robust firmware-level data integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - supports compact configuration tables without external address decoding. |
| VCC range | 4.5 V to 5.5 V - compatible with standard 5 V logic systems and tolerant of rail droop during brown-out conditions. |
| Write cycle time | 2 ms max - enables fast field-updatable parameter storage without blocking host MCU execution for extended periods. |
| Endurance | 1,000,000 erase/write cycles - suitable for applications requiring frequent recalibration or logging (e.g., energy meter tamper counters). |
| Data retention | >200 years at 25°C - ensures long-term reliability in unattended industrial equipment with no battery backup. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires only 4 GPIOs and no level-shifting for 5 V microcontrollers. |
| Temp range | –40°C to +85°C (Industrial) - validated for operation in factory automation, HVAC controls, and motor drives. |
Pinout & Package
8-lead 2×3 DFN (MC) package with exposed pad (VSS or floating), 0.5 mm pitch, 2.0 mm × 3.0 mm body. Pin 1 marked by laser dot; pin 1 = CS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions to reset internal state. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock can be paused mid-transfer without corruption. |
| 3 (DI) | Data Input | Accepts 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 falling edge. |
| 5 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout guidelines. |
| 6 (ORG) | Organization | No internal connection on 93C56A/B variants - pin is NC and must not be driven. |
| 7 (VSS) | Ground | Reference for all signals; exposed pad may be connected to PCB ground plane for thermal relief. |
| 8 (VCC) | Power Supply | 4.5–5.5 V supply; internal POR triggers at 3.8 V to prevent partial writes during power ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delay loops - host only polls DO for completion. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data remnants in unaddressed locations. |
| Power-on/off data protection | Hardware lockout below 3.8 V prevents corruption during power-up/down transients or brownouts. |
| EWEN/EWDS command security | Requires explicit enable before any write/erase, reducing risk of accidental overwrites from noise or firmware bugs. |
| Sequential read mode | Enables rapid dump of entire memory array with single CS assertion - cuts firmware overhead by >60% vs. random reads. |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at boot and during field recalibration via SPI-like Microwire interface. Use Value: Maintains calibrated accuracy across 200+ years without battery; 2 ms write time allows real-time coefficient updates during maintenance windows. | Use Scenario: Holding user-defined I/O mapping, communication protocol settings, and alarm thresholds in HVAC control panels. IC Role / Device Role / Timing Role: System parameter store interfaced to 8-bit MCU GPIOs using minimal 4-pin Microwire bus. Use Value: Fixed 8-bit organization avoids ORG pin routing complexity; 1M endurance supports daily parameter changes over 27 years. |
| Energy Meter Firmware Patch Storage | Motor Drive Fault Log Buffer |
Use Scenario: Storing small firmware patches or cryptographic keys updated remotely via PLC communication link. IC Role / Device Role / Timing Role: Secure update payload repository with hardware write-protection activated by EWDS after each patch install. Use Value: 4.5–5.5 V operation matches meter's auxiliary supply; POR lockout prevents patch corruption during line-cycle interruptions. | Use Scenario: Recording timestamped fault codes (overcurrent, overtemperature) during motor startup and runtime. IC Role / Device Role / Timing Role: Circular log buffer written sequentially using WRAL and ERAL commands to minimize wear leveling overhead. Use Value: 2 ms write cycle enables logging of up to 500 faults/sec; 256-byte capacity fits 64 three-byte fault records with timestamps. |
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/MC | 128 × 16-bit organization, 2.5–5.5 V VCC, same MC package | Requires ORG=1 or dedicated 16-bit host interface; lower voltage support enables mixed-supply designs | Select if system uses 16-bit data paths and needs wider word access or 2.5 V compatibility. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V, SOIC-8 package | Uses standard SPI protocol instead of Microwire; lacks ERAL/WRAL and EWEN/EWDS commands | Select if host already implements SPI and prioritizes broad vendor availability over Microwire-specific features. |
Compared with 93LC56BT-I/MC, the 93C56CT-I/MC offers simpler 8-bit interface and higher VCC noise margin but lacks low-voltage operation; compared with AT25020B-MAHL-T, it delivers deterministic Microwire timing and enhanced data protection commands at the cost of interface standardization.
Availability
93C56CT-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and motor drive fault logging requiring stable component supply across extended product lifecycles.
Supply support for 93C56CT-I/MC 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed for cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with minimal pin count and firmware overhead - especially where Microwire compatibility and hardware data protection are critical.
FAQ
What is the memory organization of the 93C56CT-I/MC?
The 93C56CT-I/MC has a fixed 256 × 8-bit organization. Unlike 'C'-suffix variants, it does not use the ORG pin - that pin is internally disconnected (NC) and must not be driven. This simplifies design by eliminating configuration dependencies and ensuring consistent 8-bit data transfers.
Does the 93C56CT-I/MC support sequential read mode?
Yes, the 93C56CT-I/MC supports sequential read: when CS remains high after a READ instruction, the device automatically increments the address and outputs subsequent bytes on DO. This enables efficient dumping of configuration blocks without reissuing opcodes, reducing host MCU overhead significantly.
What is the minimum VCC required to prevent accidental writes on the 93C56CT-I/MC?
The 93C56CT-I/MC incorporates power-on reset circuitry that inhibits all write/erase operations when VCC falls below 3.8 V. This threshold ensures data integrity during power ramp-up, brownout, or decoupling capacitor discharge - a key differentiator from earlier 93AA/93LC series parts with 1.5 V thresholds.
How is Ready/Busy status monitored during a write cycle on the 93C56CT-I/MC?
During a write cycle, the DO pin of the 93C56CT-I/MC outputs Ready/Busy status: logic low indicates ongoing programming, and logic high signals completion. To sample this, CS must be brought high for ≥250 ns after TCSL, then the host reads DO on the next CLK rising edge - no additional hardware is needed.
Is the exposed pad on the 93C56CT-I/MC's DFN package electrically connected?
The exposed pad on the 93C56CT-I/MC (MC package) is not internally connected to any die node. Per Microchip DS21794G-page 12, it may be left floating or soldered to VSS for improved thermal performance - no electrical tie is required, and doing so does not affect functionality or ratings.
93C56CT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
93C56CT-I/MC FAQ
1.How can I place an order for 93C56CT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56CT-I/MC 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 93C56CT-I/MC reliable?
The price and inventory of 93C56CT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56CT-I/MC is usually 5 days.
3.What payment methods are accepted for 93C56CT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56CT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56CT-I/MC?
93C56CT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56CT-I/MC 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 93C56CT-I/MC?
For technical support, including 93C56CT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56CT-I/MC requirements.
6.How does Aetrix verify that 93C56CT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93C56CT-I/MC 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 93C56CT-I/MC meets industry standards.
7.What is the process for return or replacement of 93C56CT-I/MC?
All 93C56CT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93C56CT-I/MC, 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 93C56CT-I/MC part is unused and in its original packaging.
Return procedure for 93C56CT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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