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Microchip Technology 93C56C-E/ST
- Part No.:
- 93C56C-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C56C-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,659
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Product details
Overview
93C56C-E/ST from Microchip Technology Inc. is a 2 Kbit serial EEPROM with Microwire-compatible 3-wire interface, ORG pin for runtime 8-/16-bit word size selection, 4.5–5.5 V supply range, and industrial/automotive temperature support (–40°C to +125°C). It delivers self-timed erase/write cycles, automatic ERAL/WRAL, and 1 million endurance cycles - used in automotive body control modules for configuration storage.
For engineers reviewing the 93C56C-E/ST datasheet, 93C56C-E/ST pinout, 93C56C-E/ST application, or 93C56C-E/ST equivalent, key selection criteria include VCC operating range (4.5–5.5 V), ORG-configurable memory organization, Ready/Busy status via DO pin, WRAL/ERAL timing (15 ms / 6 ms), and TSSOP-8 package compatibility with legacy 93C56B layouts.
Technical Context
The 93C56C-E/ST implements a synchronous serial Microwire interface with CS/CLK/DI/DO signals and dedicated ORG input for dynamic x8/x16 memory mapping. Its internal logic supports auto-erase-before-write, ERAL (Erase All), and WRAL (Write All) commands initiated by rising CLK edge on last data bit - distinct from 93AA/93LC variants that use falling CS edge.
Power-on protection activates at VCC ≥ 3.8 V; below this threshold, all programming modes are inhibited. The device powers up in EWDS (Erase/Write Disable) state, requiring explicit EWEN command before any erase/write operation - ensuring robust immunity against spurious writes during power ramp-up or noise events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - defines minimum system rail stability required to enable ERAL/WRAL and guarantee 6 ms / 15 ms full-array operations |
| Memory Size | 2 Kbit (256 × 8 or 128 × 16) - selectable via ORG pin; enables flexible byte- or word-oriented firmware updates without changing host driver logic |
| Endurance | 1,000,000 erase/write cycles - supports >10 years of daily reconfiguration in automotive ECU calibration storage |
| Data Retention | 200 years at +25°C - ensures nonvolatile parameter persistence over full vehicle lifecycle without refresh |
| Interface | Microwire 3-wire serial (CS/CLK/DI/DO) - requires only four MCU GPIOs; no SPI mode or address lines needed |
| Timing (TWC) | 2 ms typical write cycle - enables fast field-upgrade of safety-critical configuration blocks within tight boot-time budgets |
| Temp Range | –40°C to +125°C (Automotive E grade) - qualified for under-hood placement in engine control units and transmission controllers |
Pinout & Package
93C56C-E/ST is packaged in an 8-lead TSSOP (ST) with 0.65 mm pitch, JEDEC MO-153 compliant, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby entry/exit and Ready/Busy polling window |
| CLK | Serial Clock | Rising-edge synchronized I/O; stops/resumes freely; rising edge on final data bit triggers self-timed write on 93C-series |
| DI | Data Input | Accepts Start bit, opcode, address, and data; tied high with CS/CLK to initiate instruction sequence |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall; requires TCSL ≥250 ns before status sampling |
| VSS | Ground | Reference for all digital and analog circuitry; must be low-impedance connection to minimize noise coupling into DO status line |
| ORG | Organization Select | Logic high → 128×16 mode; logic low → 256×8 mode; must be externally biased - no internal pull-up/down |
| NC | No Connect | Pin 7 is unconnected internally; must be left floating or tied to VSS/VCC per layout best practice - no signal routing allowed |
| VCC | Power Supply | 4.5–5.5 V only; POR threshold at 3.8 V ensures safe disable below valid operating range; decoupling capacitor mandatory |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single BOM for both 8-bit and 16-bit host microcontrollers - eliminates dual EEPROM SKUs in mixed-architecture platforms |
| Self-timed ERAL/WRAL | 6 ms ERAL and 15 ms WRAL cycles execute autonomously after command latch - frees MCU resources during bulk memory initialization |
| Ready/Busy via DO pin | Eliminates need for fixed delay loops or external timers; allows precise polling-based synchronization in real-time safety-critical firmware |
| EWEN/EWDS security lock | Hardware-enforced write protection: device powers up in EWDS state; accidental writes prevented unless explicit EWEN issued first |
| Automotive-grade qualification | AEC-Q100 stress-tested for –40°C to +125°C operation - validated for placement in engine bay, transmission, and ADAS sensor modules |
Applications
| Engine Control Unit (ECU) Calibration Storage | Body Control Module (BCM) Configuration |
|---|---|
Use Scenario: Storing fuel map coefficients, ignition timing tables, and OBD-II diagnostic thresholds subject to dealer-level recalibration. IC Role / Device Role / Timing Role: Nonvolatile parameter repository with guaranteed 200-year retention and 1M-cycle endurance for repeated field updates. Use Value: Enables secure, high-reliability calibration storage without battery backup or external FRAM - reduces BOM cost and board space. | Use Scenario: Holding door lock logic states, lighting profiles, and seat position presets across vehicle power cycles. IC Role / Device Role / Timing Role: Serial configuration memory interfaced directly to 8-bit MCU GPIOs using Microwire protocol. Use Value: ORG pin allows same firmware to support both 8-bit legacy MCUs and newer 16-bit derivatives - extends platform longevity. |
| Transmission Control Unit (TCU) Gear Strategy Tables | Advanced Driver Assistance Systems (ADAS) Sensor Trim Data |
Use Scenario: Storing adaptive shift-point maps updated during vehicle learning cycles and road condition adaptation. IC Role / Device Role / Timing Role: High-endurance EEPROM accessed during cold-boot initialization and runtime parameter swaps. Use Value: 2 ms write cycle and WRAL support allow full gear table reload in <16 ms - meets ASIL-B timing constraints for fail-safe transitions. | Use Scenario: Retaining factory-calibrated offset/gain values for radar and camera sensors after power-down. IC Role / Device Role / Timing Role: Automotive-grade nonvolatile memory with AEC-Q100 qualification and 125°C ambient rating. Use Value: Eliminates need for external voltage supervisors or temperature-compensated reference circuits - simplifies sensor module design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C56B-E/ST | Dedicated 128×16 organization; no ORG pin - fixed word size | Requires host firmware compiled for 16-bit access only; no runtime switching capability | Select when system uses only 16-bit MCU peripherals and design prioritizes pin count reduction over flexibility |
| 93LC56C-I/ST | Wider VCC range (2.5–5.5 V); same ORG functionality; Industrial temp only (–40°C to +85°C) | Not qualified for under-hood automotive use; suitable for infotainment head units and gateway ECUs | Select when lower-voltage operation (e.g., 3.3 V systems) is required and ambient temperature stays below +85°C |
Compared with 93C56B-E/ST and 93LC56C-I/ST, the 93C56C-E/ST uniquely combines automotive temperature rating, ORG-driven configurability, and 4.5–5.5 V operation - making it the sole choice for high-reliability, multi-platform automotive control units needing runtime word-size adaptability.
Availability
93C56C-E/ST is available at Aetrix Electronics and suitable for automotive control units, body electronics modules, and ADAS sensor calibration systems requiring stable component supply across extended production lifecycles.
Supply support for 93C56C-E/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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed specifically for automotive and industrial applications demanding high reliability, wide temperature operation, and robust write-protection - emphasizing data integrity in harsh electrical and thermal environments.
FAQ
What is the function of the ORG pin on the 93C56C-E/ST?
The ORG pin on the 93C56C-E/ST selects memory organization: logic high configures 128 × 16-bit mode, logic low configures 256 × 8-bit mode. Unlike 93C56A/B variants, the 93C56C-E/ST requires this pin to be externally biased - it has no internal pull-up/down. This enables one hardware design to support both byte- and word-oriented host interfaces without firmware changes.
Does the 93C56C-E/ST require an external pull-up resistor on the CS pin?
Yes, Microchip recommends a 10 kΩ external pull-down resistor on the CS pin of the 93C56C-E/ST for added noise immunity and to ensure reliable Standby mode entry during power-up. While not strictly mandatory for basic operation, this resistor prevents spurious wakeups and improves robustness in electrically noisy automotive environments where the 93C56C-E/ST is commonly deployed.
How does the 93C56C-E/ST handle power-on write protection?
The 93C56C-E/ST incorporates hardware power-on reset protection that disables all erase/write functions until VCC reaches 3.8 V. Below this threshold, the device remains in EWDS (Erase/Write Disable) state regardless of command inputs. This ensures zero risk of corruption during brown-out conditions - a critical requirement validated for automotive E-grade operation in the 93C56C-E/ST.
What is the maximum clock frequency supported by the 93C56C-E/ST?
The 93C56C-E/ST supports a maximum clock frequency of 3 MHz when VCC is between 4.5 V and 5.5 V. At lower voltages outside its specified 4.5–5.5 V range, the device is not guaranteed to operate - and indeed, the datasheet explicitly restricts 93C-series operation to this narrow VCC window to ensure correct timing of ERAL (6 ms) and WRAL (15 ms) cycles.
Can the 93C56C-E/ST be used as a direct replacement for the 93C56A-E/ST?
No, the 93C56C-E/ST is not a direct replacement for the 93C56A-E/ST due to fundamental interface differences: the 93C56A-E/ST lacks the ORG pin and is fixed at 256 × 8-bit organization, while the 93C56C-E/ST requires ORG pin biasing and supports runtime reconfiguration. PCB layout, firmware addressing, and power sequencing must be revised to accommodate the ORG signal and updated timing requirements of the 93C56C-E/ST.
93C56C-E/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, 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C56C-E/ST FAQ
1.How can I place an order for 93C56C-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56C-E/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 93C56C-E/ST reliable?
The price and inventory of 93C56C-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56C-E/ST is usually 5 days.
3.What payment methods are accepted for 93C56C-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56C-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56C-E/ST?
93C56C-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56C-E/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 93C56C-E/ST?
For technical support, including 93C56C-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56C-E/ST requirements.
6.How does Aetrix verify that 93C56C-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C56C-E/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 93C56C-E/ST meets industry standards.
7.What is the process for return or replacement of 93C56C-E/ST?
All 93C56C-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C56C-E/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 93C56C-E/ST part is unused and in its original packaging.
Return procedure for 93C56C-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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