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Microchip Technology 93C56A-E/SN
- Part No.:
- 93C56A-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C56A-E/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,072
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Product details
Overview
93C56A-E/SN 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, and industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded system configuration storage, sensor calibration retention, and firmware parameter backup.
For engineers reviewing the 93C56A-E/SN datasheet, 93C56A-E/SN pinout, 93C56A-E/SN application, or 93C56A-E/SN equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), 2 ms typical write cycle time, 1 million endurance cycles, >200-year data retention, and compatibility with legacy Microwire controllers in space-constrained industrial modules.
Technical Context
The 93C56A-E/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, enforcing dedicated 8-bit operation. Its internal logic requires an EWEN command prior to any erase/write, and supports sequential read, ERAL (Erase All), and WRAL (Write All) instructions with auto-erase functionality.
Timing behavior is voltage-dependent: at VCC = 4.5–5.5 V, it supports up to 3 MHz clock frequency, 200 ns TPD, and 250 ns minimum CS low time (TCSL); Ready/Busy status is polled on DO after CS high assertion, with status valid within 200 ns (TSV) under full VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no word-size selection required. |
| VCC Range | 4.5 V to 5.5 V - incompatible with 3.3 V or 2.5 V systems; requires stable 5 V rail. |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, 5.0 V; enables long-term field reprogramming. |
| Data Retention | >200 years - specified at 25°C; ensures nonvolatile storage integrity over product lifetime. |
| Write Cycle Time | 2 ms typical - self-timed; eliminates need for external timing control during programming. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - no SPI mode; requires start-bit detection and opcode-based command set. |
| Temperature Range | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and industrial control environments. |
Pinout & Package
93C56A-E/SN is packaged in 8-lead SOIC (SN) with Pb-free Matte Tin finish. Pin 1 is CS, Pin 2 is CLK, Pin 3 is DI, Pin 4 is DO, Pin 5 is VSS, Pin 6 is NC (no internal connection), Pin 7 is NC, Pin 8 is VCC. ORG pin is absent - consistent with 'A' version designation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable mid-sequence without state corruption. |
| DI (Pin 3) | Data Input | Receives start bit, instruction opcodes, address bits, and write data; must be stable before first CLK rising edge of start condition. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or during non-read operations. |
| VSS (Pin 5) | Ground | Reference return path for all signals and power; must be low-impedance to minimize noise coupling into serial interface. |
| NC (Pin 6, Pin 7) | No Internal Connection | Unbonded; must be left floating or tied to VSS per layout best practice - no functional role. |
| VCC (Pin 8) | Power Supply | 4.5–5.5 V only; internal POR triggers at ~3.8 V; below threshold disables all operations including reads. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry; 2 ms typical cycle reduces firmware overhead and simplifies host controller implementation. |
| Automatic ERAL before WRAL | Guarantees clean memory array prior to bulk write - prevents partial-write corruption without requiring separate erase command sequence. |
| Power-On/Off Data Protection | Hardware-level lockout below VCC = 3.8 V prevents inadvertent writes during brown-out or power ramp-up/down transitions. |
| Ready/Busy Status via DO | Enables polling-based write completion detection without interrupt lines - critical for resource-constrained microcontrollers lacking GPIO interrupts. |
| 1,000,000 Endurance Cycles | Supports frequent field updates (e.g., metering logs, calibration offsets) over 10+ years of operation at typical usage rates. |
Applications
| Industrial Sensor Calibration Storage | Automotive Body Control Module (BCM) Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding trim values accessed at power-up; accessed via Microwire during boot initialization. Use Value: Enables single-pass calibration during manufacturing and field recalibration without requiring external programming hardware. | Use Scenario: Retaining user-configurable settings (e.g., mirror position, lighting profiles) across ignition cycles in automotive BCMs. IC Role / Device Role / Timing Role: Dedicated parameter EEPROM interfaced to 8-bit MCU via 3-wire bus; withstands repeated write cycles during vehicle personalization. Use Value: Meets AEC-Q100 Grade 1 requirements and supports >100,000 write cycles per setting over 15-year vehicle life. |
| Legacy Industrial PLC I/O Module Setup | Medical Diagnostic Equipment Boot Parameters |
Use Scenario: Holding module-specific I/O mapping and scaling factors in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Fixed-x8 serial EEPROM providing deterministic 20-clock-cycle read access to configuration registers during cold start. Use Value: Ensures deterministic boot timing and eliminates dependency on external SPI flash initialization delays. | Use Scenario: Storing FDA-mandated boot-time safety checksums and diagnostic self-test thresholds in portable ultrasound devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store accessed only by trusted boot ROM; leverages hardware VCC lockout for write protection. Use Value: Provides certified data integrity path from power-on reset through safety-critical initialization sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-E/SN | 128 × 16-bit organization; same VCC (4.5–5.5 V), package, and timing; requires 16-bit data path handling. | Used where wider data words reduce transaction count (e.g., storing 16-bit ADC calibration tables). | Select only if host controller supports 16-bit word transfers and memory map alignment matches 128-word addressing. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V supply, 20 MHz max clock; no Ready/Busy pin - relies on WIP flag polling. | Preferred in new designs using SPI peripherals; lacks Microwire compatibility and hardware status signaling. | Choose for SPI-native platforms; avoid if legacy Microwire controller or DO-based polling is required. |
Compared with 93LC56B-E/SN, the 93C56A-E/SN offers simpler 8-bit data handling and identical automotive qualification, while AT25020B-MAHL-T provides higher speed and broader voltage range but sacrifices Microwire compatibility and integrated status signaling.
Availability
93C56A-E/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, automotive body control module configuration, and legacy PLC I/O module setup requiring stable component supply across extended production lifecycles.
Supply support for 93C56A-E/SN 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 cost-sensitive, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components and legacy Microwire bus compatibility.
FAQ
What is the memory organization of the 93C56A-E/SN?
The 93C56A-E/SN has a fixed 256 × 8-bit (2 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and therefore does not support configurable word size - it operates exclusively in 8-bit mode. This simplifies interface design for controllers expecting byte-aligned data transfers without address remapping logic.
Does the 93C56A-E/SN support 3.3 V operation?
No, the 93C56A-E/SN does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V. Attempting to operate below 4.5 V risks unreliable reads/writes and may trigger internal power-on reset lockout, as the POR threshold is ~3.8 V. For 3.3 V systems, consider the 93LC56A-E/SN (2.5–5.5 V) instead.
How is write protection implemented on the 93C56A-E/SN?
Write protection on the 93C56A-E/SN is enforced through three mechanisms: (1) hardware VCC lockout below ~3.8 V, (2) Erase/Write Disable (EWDS) state at power-up, and (3) requirement of explicit EWEN command before any erase/write. The 93C56A-E/SN powers up in EWDS mode, blocking all programming until EWEN is issued - preventing accidental writes during power transients.
What is the maximum clock frequency supported by the 93C56A-E/SN?
The 93C56A-E/SN supports a maximum clock frequency of 3 MHz when VCC is between 4.5 V and 5.5 V. At lower voltages (not applicable here), timing de-rates: 2 MHz at 2.5–4.5 V, and 1 MHz at 1.8–2.5 V. Since the 93C56A-E/SN is rated only for 4.5–5.5 V, its operational limit is 3 MHz - enabling fast configuration loading in time-critical boot sequences.
Can the 93C56A-E/SN be used in place of the 93C56C-E/SN?
No, the 93C56A-E/SN cannot substitute for the 93C56C-E/SN in designs requiring ORG-pin-controlled 8/16-bit reconfiguration. The 93C56C-E/SN includes an ORG pin to select between 256 × 8-bit and 128 × 16-bit modes; the 93C56A-E/SN omits this pin and is hardwired to 256 × 8-bit. Swapping them requires PCB changes and firmware updates to remove ORG handling logic.
93C56A-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 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-SOIC
93C56A-E/SN FAQ
1.How can I place an order for 93C56A-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56A-E/SN 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 93C56A-E/SN reliable?
The price and inventory of 93C56A-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56A-E/SN is usually 5 days.
3.What payment methods are accepted for 93C56A-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56A-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56A-E/SN?
93C56A-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56A-E/SN 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 93C56A-E/SN?
For technical support, including 93C56A-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56A-E/SN requirements.
6.How does Aetrix verify that 93C56A-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C56A-E/SN 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 93C56A-E/SN meets industry standards.
7.What is the process for return or replacement of 93C56A-E/SN?
All 93C56A-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C56A-E/SN, 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 93C56A-E/SN part is unused and in its original packaging.
Return procedure for 93C56A-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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