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Microchip Technology 93C56B-I/SN
- Part No.:
- 93C56B-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C56B-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,168
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Product details
Overview
93C56B-I/SN from Microchip Technology Inc. is a 2 Kbit, 128 × 16-bit organization serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL/WRAL support, Ready/Busy status signaling via DO pin, and 1 million endurance cycles - used for nonvolatile parameter storage in embedded control systems.
For engineers reviewing the 93C56B-I/SN datasheet, 93C56B-I/SN pinout, 93C56B-I/SN application, or 93C56B-I/SN equivalent, key selection criteria include its fixed 16-bit word width (no ORG pin), 2 ms write cycle time, VCC ≥4.5 V requirement for ERAL/WRAL, and compatibility with legacy Microwire masters in space-constrained SOIC-8 designs.
Technical Context
The 93C56B-I/SN implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring a start condition (CS high + DI high on first CLK rising edge) before instruction execution. All instructions - READ (20 clocks), WRITE (20 clocks), ERASE (12 clocks), ERAL (12 clocks), WRAL (20 clocks) - are clocked on CLK rising edges, with data latched on DI and output on DO.
It operates exclusively in 16-bit mode (ORG pin not present), uses VCC voltage detection (3.8 V threshold) for power-on protection, and enters Erase/Write Disable (EWDS) state at power-up - requiring explicit EWEN before programming. Write operations initiate on CLK rising edge (not CS falling edge), distinguishing it from 93AA/93LC variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 × 16-bit) - supports 16-bit microcontroller data paths without byte alignment overhead |
| VCC range | 4.5 V to 5.5 V - requires stable 5 V rail; incompatible with 3.3 V systems without level shifting |
| Write cycle time | 2 ms - enables deterministic firmware timeout handling during WRITE/ERAL/WRAL operations |
| Endurance | 1,000,000 erase/write cycles - suitable for field-updatable calibration tables with daily writes over 27 years |
| Data retention | >200 years at 25°C - ensures long-term reliability in unpowered storage applications |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and discrete shift-register controllers |
| Temp range | –40°C to +85°C (Industrial) - validated for operation in motor control, HVAC, and industrial PLC environments |
Pinout & Package
93C56B-I/SN is packaged in 8-lead SOIC (SN), with no ORG pin - confirming fixed 16-bit organization. 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, and Pin 8 is VCC.
| 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 | Rising-edge synchronized I/O; stops/resumes freely; initiates 93C-series write cycles on rising edge of final data bit |
| DI (Pin 3) | Data Input | Accepts start bit, opcode, address (A6–A0), and 16-bit data; shares no internal logic with DO |
| DO (Pin 4) | Data Output / Status | Outputs 16-bit read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read states |
| VSS (Pin 5) | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection to minimize noise-induced corruption |
| NC (Pin 6 & 7) | No Connection | Internally unconnected; PCB pads may be left floating or tied to ground for mechanical stability |
| VCC (Pin 8) | Power Supply | 4.5–5.5 V only; voltage detect circuit blocks operation below 3.8 V to prevent partial writes |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components and firmware delay loops - simplifies integration into resource-limited MCUs |
| Ready/Busy status on DO | Enables polling-based write completion detection without interrupt or timer resources |
| Automatic ERAL before WRAL | Guarantees full-array erasure prior to bulk write - prevents stale data remnants in unaddressed locations |
| Power-on/off data protection | Hardware-enforced lockout below 3.8 V prevents corruption during brown-out or power ramp transitions |
| 128 × 16-bit fixed organization | Matches native word width of many 16-bit microcontrollers - reduces software overhead for multi-byte access |
Applications
| Motor Control Parameter Storage | Industrial Sensor Calibration |
|---|---|
Use Scenario: Storing PID coefficients, current limits, and fault thresholds in brushless DC motor drives. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot and runtime reconfiguration. Use Value: Enables field updates without reflashing MCU firmware; retains settings across 100,000+ power cycles. | Use Scenario: Holding factory-trimmed offset/gain values for analog temperature and pressure sensors. IC Role / Device Role / Timing Role: Read-once-at-boot storage for sensor linearization parameters. Use Value: Achieves ±0.1% measurement accuracy without external trim pots or costly laser trimming. |
| Legacy System Firmware Patching | Energy Meter Configuration |
Use Scenario: Storing hotfix patches for aging microcontroller-based HVAC controllers. IC Role / Device Role / Timing Role: External patch RAM accessed via Microwire peripheral on legacy PIC16F devices. Use Value: Extends product lifecycle by enabling post-deployment bug fixes without hardware redesign. | Use Scenario: Storing tariff schedules, CT/PT ratios, and billing constants in DIN-rail energy meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store updated via isolated RS-485 interface. Use Value: Meets IEC 62056-21 requirements for write-protection and 200-year data retention under continuous operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C56B-I/P | Same electrical specs and pinout; packaged in 8-lead PDIP instead of SOIC-8 | Used in through-hole prototyping or legacy board repairs where SOIC footprint unavailable | Select for hand-soldered development or replacement in existing PDIP sockets |
| 93LC56B-I/SN | Wider VCC range (2.5–5.5 V); identical 128×16 organization and SOIC-8 package | Supports mixed-voltage systems (e.g., 3.3 V MCU with 5 V EEPROM bus) without level shifters | Select when operating below 4.5 V or integrating with modern low-voltage microcontrollers |
Compared with 93C56B-I/P, the 93C56B-I/SN offers superior thermal performance and board-space efficiency in surface-mount production; compared with 93LC56B-I/SN, it trades wider supply flexibility for higher noise immunity and guaranteed 5 V timing margins in legacy industrial designs.
Availability
93C56B-I/SN is available at Aetrix Electronics and suitable for motor control, sensor calibration, and energy metering applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for 93C56B-I/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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed for cost-sensitive, low-power nonvolatile storage in industrial and automotive systems where Microwire interface compatibility and robust data retention are critical.
FAQ
What is the memory organization of the 93C56B-I/SN?
The 93C56B-I/SN has a fixed 128 × 16-bit organization (2 Kbit total), with no ORG pin - unlike 'C' variants. This means it always operates in 16-bit mode, accepting 7-bit addresses and 16-bit data words during READ and WRITE instructions. The absence of ORG simplifies PCB layout and eliminates external configuration logic.
Does the 93C56B-I/SN support 3.3 V operation?
No, the 93C56B-I/SN does not support 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, and its internal voltage detector disables all operations below 3.8 V. For 3.3 V systems, consider the pin-compatible 93LC56B-I/SN, which operates from 2.5 V to 5.5 V while maintaining identical 128×16 organization and SOIC-8 package.
How is write completion signaled on the 93C56B-I/SN?
Write completion is signaled via the DO pin acting as a Ready/Busy status line. After initiating WRITE, ERASE, ERAL, or WRAL, bring CS high for ≥250 ns, then sample DO: logic low indicates ongoing operation, logic high confirms completion. This polling method avoids the need for fixed delays and accommodates process/voltage variations across the industrial temperature range.
What is the minimum clock frequency required for the 93C56B-I/SN?
The 93C56B-I/SN has no minimum clock frequency - CLK can be stopped indefinitely at high or low level between bits. This allows microcontrollers with variable execution speed or low-power modes to pause communication without violating timing. Only maximum frequency (3 MHz at 4.5–5.5 V) and minimum pulse widths (TCKH/TCKL) are specified.
Can the 93C56B-I/SN be used in automotive applications?
The 93C56B-I/SN is rated for Industrial temperature (–40°C to +85°C), not Automotive (–40°C to +125°C). For automotive use, select the 93C56B-E/SN variant, which shares identical functionality and pinout but is qualified to AEC-Q100 Grade 3 and tested across the extended temperature range with enhanced reliability screening.
93C56B-I/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:
- 128 x 16
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C56B-I/SN FAQ
1.How can I place an order for 93C56B-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56B-I/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 93C56B-I/SN reliable?
The price and inventory of 93C56B-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56B-I/SN is usually 5 days.
3.What payment methods are accepted for 93C56B-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56B-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56B-I/SN?
93C56B-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56B-I/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 93C56B-I/SN?
For technical support, including 93C56B-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56B-I/SN requirements.
6.How does Aetrix verify that 93C56B-I/SN is sourced from the original manufacturer or authorized distributors?
All 93C56B-I/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 93C56B-I/SN meets industry standards.
7.What is the process for return or replacement of 93C56B-I/SN?
All 93C56B-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C56B-I/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 93C56B-I/SN part is unused and in its original packaging.
Return procedure for 93C56B-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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