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Microchip Technology 93C56B-E/SN
- Part No.:
- 93C56B-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C56B-E/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,127
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Product details
Overview
93C56B-E/SN from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and automotive-grade temperature operation (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status signaling via DO pin - used for nonvolatile parameter storage in engine control units and automotive sensor modules.
For engineers reviewing the 93C56B-E/SN datasheet, 93C56B-E/SN pinout, 93C56B-E/SN application, or 93C56B-E/SN equivalent, key selection considerations include its fixed 16-bit organization (no ORG pin), automotive qualification, 2 ms write cycle time, and compatibility with legacy Microwire controllers in safety-critical embedded systems.
Technical Context
The 93C56B-E/SN implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring no external clock enable or reset signals. Its instruction set includes dedicated 16-bit READ/WRITE/ERASE commands and full-array operations (ERAL/WRAL), all initiated by rising-edge CLK on the final data bit - distinct from AA/LC variants that use CS falling edge.
Power-on protection is enforced by a 3.8 V VCC detect threshold; below this voltage, all programming functions are inhibited. The device powers up in EWDS (Erase/Write Disable) mode, requiring explicit EWEN before any WRITE or ERASE command - a hardware-level safeguard against unintended memory modification during power transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 words × 16 bits) - supports compact firmware parameter tables without byte-addressing overhead |
| VCC range | 4.5 V to 5.5 V - matches automotive 5 V rail tolerance and eliminates need for external LDO in ECU designs |
| Write cycle time | 2 ms max - enables fast field-updatable calibration data writes without blocking host MCU execution |
| Endurance | 1,000,000 erase/write cycles - sufficient for lifetime logging in telematics or ADAS subsystems |
| Data retention | 200 years at +85°C - ensures configuration integrity across vehicle service life without refresh |
| Temperature grade | Automotive (−40°C to +125°C) - qualified per AEC-Q100 for under-hood and transmission control applications |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® and dsPIC® microcontrollers without protocol translation |
Pinout & Package
8-lead SOIC package (SN suffix), Pb-free Matte Tin finish, 150 mil body width. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock stops freely during opcode/address/data prep |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and 16-bit write data; no pull-up required |
| 4 (DO) | Data Output / Status | Outputs 16-bit read data or Ready/Busy (low = busy); high-Z when CS low or idle |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; requires low-impedance connection to PCB ground plane |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (NC) | No Connect | Internally unconnected; identical handling as Pin 6 |
| 8 (VCC) | Power Supply | 4.5–5.5 V input; bypass capacitor (0.1 µF ceramic) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 16-bit organization | Eliminates ORG pin routing and external logic; simplifies PCB layout for space-constrained automotive modules |
| Self-timed 2 ms write cycle | Removes need for host MCU to manage timing margins; reduces firmware complexity in real-time systems |
| Automatic ERAL before WRAL | Guarantees clean memory array prior to bulk write - prevents partial-data corruption during power loss |
| Ready/Busy polling via DO | Enables non-blocking host operation; DO low indicates active erase/write, freeing CPU for other tasks |
| EWEN/EWDS hardware lock | Prevents accidental writes during brown-out or noise events; requires explicit enable before each programming sequence |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values and knock sensor calibration maps updated during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with deterministic 2 ms write latency and AEC-Q100 compliance. Use Value: Enables closed-loop engine optimization without external FRAM or battery-backed SRAM, reducing BOM cost and board area. | Use Scenario: Retaining radar sensor alignment offsets and camera distortion coefficients after ignition cycle. IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfacing directly with CAN-connected microcontroller over Microwire bus. Use Value: Maintains sensor accuracy across 200,000+ ignition cycles while meeting ASIL-B functional safety requirements. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Logging gear shift learning history and clutch wear metrics for predictive maintenance alerts. IC Role / Device Role / Timing Role: High-endurance (1M cycles) serial EEPROM supporting frequent runtime updates in harsh thermal environments. Use Value: Survives under-dash temperatures up to +125°C with zero data corruption, eliminating need for thermal derating. | Use Scenario: Storing user-configurable lighting profiles and door lock preferences across vehicle power-down events. IC Role / Device Role / Timing Role: Low-power (1 µA standby) nonvolatile memory with VCC brown-out protection at 3.8 V. Use Value: Prevents configuration loss during battery voltage sag during cold cranking or alternator load dump. |
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/SN | Industrial temp range (−40°C to +85°C); identical electrical specs and pinout | Not qualified for automotive under-hood use; unsuitable for ECU/TCM deployment | Select only for cost-sensitive industrial controls where ambient temperature stays below +85°C |
| AT25128B-MAHL-T | SPI interface (4-wire), 1.8–5.5 V VCC, 128 Kbit density, 5 ms write time | Higher density but slower write; requires SPI controller instead of Microwire | Choose when migrating to SPI-based platforms or needing >2 Kbit capacity; verify timing compatibility with host firmware |
Compared with 93C56B-I/SN, the 93C56B-E/SN adds automotive qualification and higher VCC minimum (4.5 V), making it mandatory for AEC-Q100-compliant designs; versus AT25128B-MAHL-T, it offers faster write speed and direct Microwire compatibility but lower density and narrower voltage range.
Availability
93C56B-E/SN is available at Aetrix Electronics and suitable for automotive electronics, engine management systems, and ADAS sensor modules requiring stable component supply across extended product lifecycles.
Supply support for 93C56B-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, low-power, nonvolatile memory applications in automotive, industrial, and consumer systems requiring Microwire interface compatibility and long-term data retention.
FAQ
What is the memory organization of the 93C56B-E/SN?
The 93C56B-E/SN has a fixed 128 × 16-bit (2 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and is hardwired for 16-bit word access - eliminating external configuration logic and simplifying interface design for microcontrollers with native 16-bit serial peripherals.
Does the 93C56B-E/SN require an external pull-up resistor on the DO pin?
No, the 93C56B-E/SN does not require an external pull-up on DO. The pin actively drives high/low during READ or Ready/Busy polling and enters high-impedance (High-Z) state when CS is low or during idle - compatible with standard CMOS bus loading without additional components.
What is the minimum VCC required to execute ERAL or WRAL on the 93C56B-E/SN?
The 93C56B-E/SN requires VCC ≥ 4.5 V to execute ERAL (Erase All) or WRAL (Write All) commands. This is enforced by internal voltage detection circuitry - if VCC drops below 4.5 V during these operations, the command will abort and the device remains in EWDS mode until valid voltage is restored.
How does the 93C56B-E/SN indicate readiness after a WRITE operation?
The 93C56B-E/SN indicates readiness after a WRITE operation by driving DO high when CS is brought high after ≥250 ns low time (TCSL). While busy, DO remains low; once complete, DO goes high and stays high until the next Start condition - enabling reliable polling without timeout assumptions.
Is the 93C56B-E/SN pin-compatible with the 93C56A-E/SN?
Yes, the 93C56B-E/SN is pin-compatible with the 93C56A-E/SN in the same SOIC-8 (SN) package. Both share identical pinout (CS/CLK/DI/DO/VSS/NC/NC/VCC), but differ in memory organization (128×16 vs. 256×8) and instruction timing - firmware must be adapted for 16-bit addressing and data width.
93C56B-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:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C56B-E/SN FAQ
1.How can I place an order for 93C56B-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56B-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 93C56B-E/SN reliable?
The price and inventory of 93C56B-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 93C56B-E/SN is usually 5 days.
3.What payment methods are accepted for 93C56B-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56B-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56B-E/SN?
93C56B-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56B-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 93C56B-E/SN?
For technical support, including 93C56B-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56B-E/SN requirements.
6.How does Aetrix verify that 93C56B-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C56B-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 93C56B-E/SN meets industry standards.
7.What is the process for return or replacement of 93C56B-E/SN?
All 93C56B-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C56B-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 93C56B-E/SN part is unused and in its original packaging.
Return procedure for 93C56B-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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