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Microchip Technology 93LC56BT-I/MC
- Part No.:
- 93LC56BT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93LC56BT-I/MC.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,919
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Product details
Overview
93LC56BT-I/MC from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and 1,000,000 erase/write cycles. It operates in dedicated 8-bit organization (no ORG pin), features Ready/Busy status signaling via DO, and is packaged in an 8-lead 2×3 DFN (MC). It is used for nonvolatile parameter storage in embedded microcontroller systems.
For engineers reviewing the 93LC56BT-I/MC datasheet, 93LC56BT-I/MC pinout, 93LC56BT-I/MC application, or 93LC56BT-I/MC equivalent, key selection criteria include its 256 × 8-bit fixed organization, DFN package footprint compatibility, 6 ms typical write cycle time, self-timed erase/write with auto-erase, and power-on/off data protection circuitry.
Technical Context
The 93LC56BT-I/MC implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (as confirmed by device family table and pin function table). It uses internal address counters and mode decode logic to execute READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions over a single bidirectional data line (DO/DI).
Its memory array is organized as 256 words × 8 bits, with sequential read capability and automatic ERAL before WRAL. Power-on reset detection (VPOR = 1.5 V typical) and standby current of ≤1 µA at I-temp ensure robust operation in battery-backed or low-power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit); fixed x8 organization - no ORG pin required, simplifying PCB layout and firmware addressing. |
| VCC range | 2.5 V to 5.5 V; supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifting. |
| Write endurance | 1,000,000 erase/write cycles; enables long-term field calibration storage in industrial controllers. |
| Data retention | Greater than 200 years at 25°C; ensures firmware configuration persistence across product lifetime. |
| Write cycle time | 6 ms typical (TWC); deterministic timing allows precise host CPU polling or timeout-based status checking. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); minimal GPIO usage and proven interoperability with PIC® and other MCU families. |
| Operating temp | –40°C to +85°C (Industrial grade); qualified for use in motor drives, HVAC controls, and industrial sensors. |
Pinout & Package
Package: 8-lead 2×3 mm DFN (exposed pad, MC suffix), RoHS-compliant matte tin finish. Pin 1 marked by laser dot; exposed pad may be connected to VSS or left floating per Microchip packaging spec.
| 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 (≤1 µA ICCS). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers on rising edge; supports clock stop/resume; max 3 MHz at VCC ≥4.5 V. |
| 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 status (low = busy); enters High-Z on CS falling edge. |
| 5 (NC) | No internal connection | Unbonded pad; must be left floating or tied to VSS per layout guidelines - no functional role. |
| 6 (ORG) | No internal connection | Not bonded on 'A' versions like 93LC56A/B/C - pin is NC, not configurable; confirms fixed x8 organization. |
| 7 (VSS) | Ground | Reference for all I/O and internal logic; exposed pad recommended to connect to ground plane for thermal and EMI performance. |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; internal POR circuit activates above 1.5 V typical; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write with auto-erase | Eliminates external timing control; host only needs to monitor DO for Ready/Busy - reduces firmware complexity. |
| Automatic ERAL before WRAL | Ensures full-array write reliability without requiring separate erase command - prevents partial-write corruption. |
| Power-on/off data protection | Hardware-level inhibition below VPOR (1.5 V); prevents spurious writes during brown-out or power ramp-up. |
| EWEN/EWDS security commands | Enables selective write-enable per operation; powers up in EWDS state - blocks accidental writes at boot. |
| Sequential read mode | Allows continuous 256-byte burst reads with single CS assertion - improves parameter dump speed in diagnostics. |
Applications
| Motor Control Parameter Storage | Smart Sensor Calibration Data |
|---|---|
Use Scenario: Storing PID coefficients, fault thresholds, and runtime calibration offsets in BLDC motor drivers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during MCU initialization and runtime updates. Use Value: Enables field-upgradable tuning without firmware reflash; 256 × 8-bit capacity accommodates 32 parameters × 8 bytes each. | Use Scenario: Retaining factory-trimmed sensor gain/offset values and temperature compensation tables in industrial pressure sensors. IC Role / Device Role / Timing Role: Microwire-configured serial EEPROM interfaced directly to sensor ASIC or MCU ADC subsystem. Use Value: Guarantees >200-year data retention under thermal stress; 1M endurance supports periodic recalibration logging. |
| Embedded System Boot Configuration | IoT Edge Device Identity Storage |
Use Scenario: Holding bootloader configuration flags (e.g., UART baud rate, secure boot enable, watchdog timeout) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Early-boot hardware-accessible memory mapped via GPIO bit-banged Microwire. Use Value: 2.5 V min VCC allows operation with Li-ion backup; power-on protection prevents config corruption during cold start. | Use Scenario: Securing unique device identifiers (UID), TLS certificate seeds, and OTA update keys in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile storage isolated from main application processor. Use Value: DFN package (MC) enables compact 2×3 mm footprint; RoHS compliance meets global IoT certification requirements. |
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/MC | 128 × 16-bit organization; same VCC range, package, and timing - requires 16-bit firmware addressing. | Used where word-aligned data (e.g., 16-bit ADC results) dominates; incompatible with existing 8-bit byte-addressed code. | Select only if system architecture mandates native 16-bit access and memory map permits halved address depth. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, SOIC-8 package - different protocol and footprint. | Requires SPI peripheral and PCB redesign; lacks Ready/Busy pin - relies on fixed 5 ms write timeout. | Choose when migrating to SPI-based platforms or when leveraging Atmel's enhanced write-protection features. |
Compared with 93LC56B-I/MC, the 93LC56BT-I/MC provides simpler 8-bit byte addressing and eliminates ORG pin routing; versus AT25020B-MAHL-T, it retains Microwire compatibility and DO-based status polling - critical for resource-constrained 8-bit MCUs lacking SPI hardware.
Availability
93LC56BT-I/MC is available at Aetrix Electronics and suitable for motor control, smart sensor, and embedded boot configuration applications requiring stable component supply, long-lifecycle support, and RoHS-compliant DFN packaging.
Supply support for 93LC56BT-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona.
The 93LC56 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing simple 3-wire nonvolatile storage with hardware write protection.
FAQ
What is the memory organization of the 93LC56BT-I/MC?
The 93LC56BT-I/MC has a fixed 256 × 8-bit (2 Kbit) organization. As an 'A' version device, it does not include an ORG pin - eliminating configuration ambiguity and simplifying design. This differs from 'C' versions (e.g., 93LC56C) which require external logic on ORG to select between x8/x16 modes. The 93LC56BT-I/MC is fully compatible with byte-oriented firmware stacks.
Does the 93LC56BT-I/MC support sequential read operations?
Yes, the 93LC56BT-I/MC supports sequential read: after issuing a READ instruction with an initial address, holding CS high causes the internal address counter to auto-increment, outputting consecutive bytes on DO with each CLK rising edge. This enables efficient bulk reads - for example, retrieving all 256 bytes of calibration data in a single CS assertion, reducing host MCU overhead.
What is the purpose of the NC pin (Pin 5) and ORG pin (Pin 6) on the 93LC56BT-I/MC DFN package?
On the 93LC56BT-I/MC, Pin 5 is labeled NC (No Connection) and Pin 6 is ORG - but both are unconnected internally. As a fixed x8 'A' version device, ORG is not bonded; the datasheet explicitly states "ORG pin is NC on A/B devices." These pins must be left floating or tied to VSS per layout guidance - they serve no functional role and do not affect 93LC56BT-I/MC operation.
How does the Ready/Busy status work on the 93LC56BT-I/MC?
The 93LC56BT-I/MC signals Ready/Busy status on the DO pin: during ERASE, WRITE, ERAL, or WRAL operations, bringing CS high after ≥250 ns low (TCSL) causes DO to drive low while programming is active and high when complete. This allows precise host polling without fixed delays. After completion, issuing a Start bit followed by CS low clears the status flag - a hardware handshake unique to the 93LC56BT-I/MC family.
Is the 93LC56BT-I/MC compatible with 3.3 V microcontrollers?
Yes, the 93LC56BT-I/MC operates across 2.5 V to 5.5 V, making it fully compatible with standard 3.3 V microcontrollers. Its VIH1 threshold is 2.0 V (min) at VCC ≥2.7 V, and VOL1 is ≤0.4 V at IOL = 2.1 mA - ensuring reliable logic-level interfacing. No level-shifting circuitry is required, and its 1 µA standby current supports battery-operated 3.3 V systems.
93LC56BT-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:
- 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
93LC56BT-I/MC FAQ
1.How can I place an order for 93LC56BT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56BT-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 93LC56BT-I/MC reliable?
The price and inventory of 93LC56BT-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 93LC56BT-I/MC is usually 5 days.
3.What payment methods are accepted for 93LC56BT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56BT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56BT-I/MC?
93LC56BT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56BT-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 93LC56BT-I/MC?
For technical support, including 93LC56BT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56BT-I/MC requirements.
6.How does Aetrix verify that 93LC56BT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93LC56BT-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 93LC56BT-I/MC meets industry standards.
7.What is the process for return or replacement of 93LC56BT-I/MC?
All 93LC56BT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56BT-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 93LC56BT-I/MC part is unused and in its original packaging.
Return procedure for 93LC56BT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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