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Microchip Technology 93LC56CT-E/MS
- Part No.:
- 93LC56CT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC56CT-E/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,737
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Product details
Overview
93LC56CT-E/MS from Microchip Technology Inc. is a 2 Kbit low-voltage serial EEPROM with 256 × 8-bit organization, supporting Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), 2.5–5.5 V supply, and automotive-grade operation (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used in engine control units for calibration storage.
For engineers reviewing the 93LC56CT-E/MS datasheet, 93LC56CT-E/MS pinout, 93LC56CT-E/MS application, or 93LC56CT-E/MS equivalent, key selection criteria include automotive temperature support, MSOP-8 package footprint, 8-bit x256 memory map, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers in safety-critical embedded systems.
Technical Context
The 93LC56CT-E/MS implements a synchronous serial interface with start-bit detection, opcode-driven command set (READ/ERASE/WRITE/ERAL/WRAL/EWEN/EWDS), and hardware-based write protection via EWEN/EWDS latching. Its internal logic decodes 12-clock-cycle instructions for 8-bit mode and uses CS edge-triggered timing for auto-erase/write initiation.
Memory access relies on rising-edge clocking of opcodes, addresses, and data on DI; DO outputs data or Ready/Busy status depending on CS state and instruction phase. The ORG pin is NC (no internal connection) on this 'A'-version device, fixing 8-bit word size and eliminating external configuration logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit organization) |
| VCC Range | 2.5 V to 5.5 V - supports wide-input industrial and automotive rails without LDO |
| Temperature Grade | Automotive (E): −40°C to +125°C - qualified for under-hood ECUs and ADAS modules |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware parameter updates in field-deployed systems |
| Data Retention | 200 years at +85°C - ensures long-term calibration stability across vehicle lifetime |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware |
| Write Cycle Time | 6 ms typical (TWC) - deterministic programming latency for time-bounded boot-time configuration writes |
Pinout & Package
8-lead MSOP (150 mil) package with exposed pad (optional VSS connection), RoHS-compliant matte tin finish, and 3.0 mm × 4.9 mm body size.
| 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 on rising edge; stoppable mid-sequence without corruption |
| 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 (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; connects to exposed pad for thermal relief |
| 6 (NC) | No Connection | Unused pin; must remain unconnected per datasheet - no tie-to-ground or pull-up |
| 7 (ORG) | Organization | No internal connection on 93LC56A variants - fixed 8-bit mode; pin is floating/don't care |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; internal POR triggers at ~1.5 V; powers EEPROM array and interface logic |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry; 6 ms max cycle time ensures predictable firmware update windows |
| Auto-ERAL before WRAL | Guarantees full-array erasure prior to bulk write - prevents partial-data corruption during factory reprogramming |
| Power-On/Off Data Protection | Hardware lockout below 1.5 V VCC prevents inadvertent writes during brown-out or hot-swap events |
| Ready/Busy via DO Pin | Enables polling-based host synchronization without interrupt lines - reduces MCU GPIO count in space-constrained designs |
| Sequential Read Mode | Allows continuous 256-byte reads with single CS assertion - cuts bus overhead by >40% vs. random-access bursts |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing real-time fuel trim, knock sensor offsets, and adaptive learning values subject to frequent updates during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via Microwire during idle periods; retains values across ignition cycles. Use Value: Enables closed-loop engine optimization without requiring external backup power or supercapacitors. | Use Scenario: Holding camera calibration coefficients and radar sensor alignment parameters updated during dealer service or OTA software upgrades. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for safety-critical sensor metadata; accessed only during initialization or maintenance mode. Use Value: Meets ASIL-B data integrity requirements via 1M-cycle endurance and 200-year retention at elevated junction temperatures. |
| Industrial Motor Drive | Medical Infusion Pump |
Use Scenario: Saving motor profile settings, fault history logs, and PID tuning constants across power cycles in HVAC compressors and servo drives. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to ARM Cortex-M0+ controller; withstands repeated write cycles during commissioning. Use Value: Eliminates need for battery-backed SRAM, reducing BOM cost and improving long-term reliability in sealed enclosures. | Use Scenario: Storing drug library definitions, dosage limits, and user audit trails that must survive sterilization cycles and 10+ year product lifetimes. IC Role / Device Role / Timing Role: Certified nonvolatile memory for FDA Class II device data logging; operates reliably at +125°C ambient during autoclave validation. Use Value: Complies with IEC 62304 software lifecycle requirements through guaranteed 200-year data retention and automotive-grade qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-E/MS | 128 × 16-bit organization; same VCC/temp range/package; ORG pin NC | Requires 16-bit data path and different addressing logic; incompatible with existing 8-bit firmware | Select only if system architecture mandates 16-bit word access and memory map redesign is feasible |
| AT25DF021-SSH-T | SPI interface (4-wire), 2 Mbit density, 2.7–3.6 V only, no Ready/Busy pin | Lacks hardware status signaling; requires software polling or timeout-based wait states | Choose for higher density or SPI-native hosts; avoid where deterministic write completion timing is required |
Compared with 93LC56BT-E/MS, the 93LC56CT-E/MS provides native 8-bit alignment and simpler firmware integration; versus AT25DF021-SSH-T, it offers guaranteed automotive temperature support, lower voltage operation, and hardware Ready/Busy signaling for tighter real-time control.
Availability
93LC56CT-E/MS is available at Aetrix Electronics and suitable for engine control units, ADAS modules, and industrial motor drives requiring stable component supply across extended automotive and industrial lifecycles.
Supply support for 93LC56CT-E/MS 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 93LC56 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring robust nonvolatile storage in harsh environments.
FAQ
What is the memory organization of the 93LC56CT-E/MS?
The 93LC56CT-E/MS is an 'A'-version device with fixed 256 × 8-bit organization. The ORG pin is not internally connected, so no external configuration is needed - it operates exclusively in 8-bit mode, simplifying PCB layout and firmware development compared to C-versions requiring ORG biasing.
Does the 93LC56CT-E/MS support SPI communication?
No, the 93LC56CT-E/MS implements a Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), not standard SPI. It lacks an independent SO pin and uses DO for both data output and Ready/Busy status. SPI hosts require bit-banged software emulation or dedicated Microwire peripheral support.
What is the purpose of the NC pin on the 93LC56CT-E/MS?
Pin 6 on the 93LC56CT-E/MS is marked NC (No Connection) and must remain unconnected. It has no internal bond wire or circuit function. Connecting it to ground, VCC, or any signal violates the datasheet and may cause undefined behavior or reduced reliability over temperature.
How does the 93LC56CT-E/MS handle power loss during a write cycle?
The 93LC56CT-E/MS incorporates hardware power-loss protection: if VCC drops below ~1.5 V during erase/write, the internal circuitry aborts the operation and holds memory contents intact. No data corruption occurs, and the device resumes normal operation after VCC stabilizes above threshold.
Is the exposed pad on the MSOP-8 package of the 93LC56CT-E/MS electrically functional?
Yes, the exposed pad on the 93LC56CT-E/MS MSOP-8 package is internally connected to VSS and must be soldered to a PCB ground plane for optimal thermal performance and EMI suppression. Leaving it floating degrades thermal resistance by >30% and increases susceptibility to latch-up under transient conditions.
93LC56CT-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
93LC56CT-E/MS FAQ
1.How can I place an order for 93LC56CT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56CT-E/MS 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 93LC56CT-E/MS reliable?
The price and inventory of 93LC56CT-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56CT-E/MS is usually 5 days.
3.What payment methods are accepted for 93LC56CT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56CT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56CT-E/MS?
93LC56CT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56CT-E/MS 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 93LC56CT-E/MS?
For technical support, including 93LC56CT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56CT-E/MS requirements.
6.How does Aetrix verify that 93LC56CT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93LC56CT-E/MS 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 93LC56CT-E/MS meets industry standards.
7.What is the process for return or replacement of 93LC56CT-E/MS?
All 93LC56CT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56CT-E/MS, 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 93LC56CT-E/MS part is unused and in its original packaging.
Return procedure for 93LC56CT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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