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Microchip Technology 93C56B-E/ST
- Part No.:
- 93C56B-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C56B-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,385
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Product details
Overview
93C56B-E/ST 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, industrial-automotive temperature grade (–40°C to +125°C), and 1,000,000 erase/write cycles. It serves as nonvolatile configuration memory in microcontroller-based systems requiring robust data retention (>200 years) and power-on/off protection.
For engineers reviewing the 93C56B-E/ST datasheet, 93C56B-E/ST pinout, 93C56B-E/ST application, or 93C56B-E/ST equivalent, key selection criteria include its fixed 16-bit organization (no ORG pin), automotive-grade reliability, 2 ms write cycle time, Ready/Busy status signaling via DO, and compatibility with legacy Microwire controllers in space-constrained embedded designs.
Technical Context
The 93C56B-E/ST implements a synchronous serial interface with CS, CLK, and DI/DO pins, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal architecture includes an address decoder, data register, mode decode logic, and output buffer - all optimized for deterministic timing under 4.5–5.5 V operation.
Unlike C-versions, this B-variant lacks an ORG pin and permanently configures memory as 128 × 16-bit. Write operations are initiated by the rising edge of CLK on the final data bit, and device status is signaled via DO during active programming - requiring CS high ≥250 ns after TCSL to sample Ready/Busy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit organized as 128 words × 16 bits - enables compact storage of 16-bit configuration registers or calibration tables. |
| VCC range | 4.5 V to 5.5 V - compatible with 5 V logic systems and rejects brown-out conditions below 3.8 V via built-in POR detection. |
| Write cycle time | 2 ms typical - defines minimum interval between successive WRITE/ERAL/WRAL commands; no external delay required. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in telemetry or firmware parameter storage applications. |
| Data retention | Greater than 200 years at 25°C - ensures long-term validity of stored calibration, serial numbers, or security keys without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware but supporting bit-banged Microwire protocols. |
| Temperature range | –40°C to +125°C (Automotive E-grade) - qualified for under-hood, motor control, and industrial PLC environments. |
Pinout & Package
Package: 8-lead SOIC (ST suffix per Microchip marking convention), Pb-free Matte Tin finish, body dimensions 4.9 mm × 3.9 mm × 1.75 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion. |
| 2 CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stopped mid-transfer without corruption. |
| 3 DI | Data Input | Accepts Start bit, instruction opcodes, address bits, and write data; tied to DO only with series resistor to prevent bus conflict. |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or during non-read states. |
| 5 VSS | Ground | Reference return path for all I/O and internal circuitry; requires low-impedance connection to system ground plane. |
| 6 NC | No Connect | Internally unconnected; must remain floating - not used for ORG (B-variant has fixed 16-bit organization). |
| 7 NC | No Connect | Internally unconnected; unused pin per SOIC pinout - no routing or termination required. |
| 8 VCC | Power Supply | 4.5–5.5 V supply input; bypass capacitor (0.1 µF ceramic) required within 10 mm of pin for noise immunity during write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delays - internal state machine manages auto-erase before write. |
| Automatic ERAL before WRAL | Ensures full array erasure prior to bulk write, preventing partial-data corruption without host intervention. |
| Power-on/off data protection | Hardware lockout below 3.8 V VCC prevents inadvertent writes during power ramp-up/down or brownout events. |
| Ready/Busy status via DO | Enables polling-based firmware flow control instead of fixed timeouts - reduces worst-case latency in real-time systems. |
| 100% tested AC/DC parameters | Guarantees timing compliance (e.g., TWC = 2 ms, TPD ≤ 400 ns) across full –40°C to +125°C range without derating. |
Applications
| Motor Control Systems | Industrial PLC Modules |
|---|---|
Use Scenario: Storing motor calibration coefficients, fault logs, and runtime parameters in brushless DC motor drives. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced to MCU via bit-banged Microwire; accessed during initialization and error recovery. Use Value: 128 × 16-bit organization matches common 16-bit register maps; >200-year retention ensures lifetime data integrity without battery backup. | Use Scenario: Holding I/O mapping tables, firmware update flags, and user-configurable logic states in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent storage for configuration data updated infrequently but requiring guaranteed write completion. Use Value: 2 ms write cycle and EWEN/EWDS command set prevent accidental overwrites during power transients in noisy factory environments. |
| Automotive Body Controllers | Medical Diagnostic Equipment |
Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in automotive door modules operating at 125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 stress-tested nonvolatile memory storing user preferences with automotive-grade reliability. Use Value: –40°C to +125°C qualification and 1M endurance support 10+ years of daily reconfiguration in harsh under-dash locations. | Use Scenario: Retaining calibration constants, sensor offsets, and regulatory audit trails in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Tamper-resistant configuration store accessed during boot and service mode; protected by hardware write disable. Use Value: Power-on data protection and EWDS lockout ensure calibration data remains intact during unexpected power loss or field servicing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-I/ST | Same 128 × 16-bit organization, but rated for –40°C to +85°C (Industrial I-grade) and 2.5–5.5 V supply. | Not qualified for automotive under-hood use; suitable for commercial/industrial control panels with lower ambient temps. | Select if operating temperature stays ≤85°C and wider VCC range (2.5 V) is needed for mixed-voltage systems. |
| AT25020B-MAHL-T | 2 Kbit SPI EEPROM (8-lead SOIC), 1.8–5.5 V, 5 MHz SPI interface, no Ready/Busy pin - uses status register polling. | Requires SPI master instead of Microwire; lacks dedicated DO status line - increases firmware complexity for busy-wait loops. | Select if migrating to SPI infrastructure and can accommodate status register reads instead of direct DO polling. |
Compared with 93LC56B-I/ST, the 93C56B-E/ST provides higher temperature resilience and tighter VCC regulation for automotive use; compared with AT25020B-MAHL-T, it offers simpler timing-critical polling via DO but requires Microwire-compatible controller firmware.
Availability
93C56B-E/ST is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, motor control systems, and medical diagnostics requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93C56B-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The 93Cxx EEPROM family was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with minimal pin count and legacy interface support - especially in automotive and industrial markets.
FAQ
What is the memory organization of the 93C56B-E/ST?
The 93C56B-E/ST is permanently configured as 128 words × 16 bits (2 Kbit total). Unlike C-variants, it has no ORG pin - the 16-bit word size is hardwired, eliminating external configuration logic and simplifying PCB layout for fixed-width data paths.
Does the 93C56B-E/ST require an external pull-up resistor on the DO pin?
No external pull-up is required on the DO pin of the 93C56B-E/ST. The device actively drives DO high or low during Read or Ready/Busy status sampling, and places it in High-Z when inactive. A series resistor (e.g., 10 kΩ) is recommended only if DI and DO are shorted together to prevent bus contention.
How does the 93C56B-E/ST protect against unintended writes during power transitions?
The 93C56B-E/ST incorporates hardware-level write protection that disables all erase/write functions when VCC falls below 3.8 V. This power-on/power-off protection, combined with mandatory EWEN command activation before programming, prevents data corruption during brownout or startup sequences.
What is the maximum clock frequency supported by the 93C56B-E/ST?
The 93C56B-E/ST supports a maximum clock frequency of 3 MHz when VCC is 4.5–5.5 V. At this rate, READ and WRITE instructions complete in 20 clock cycles (≈6.7 µs), while timing margins (TCKH ≥200 ns, TCKL ≥100 ns) remain fully satisfied per DS21794G.
Can the 93C56B-E/ST be used as a direct replacement for the 93C56A-E/ST?
No - the 93C56B-E/ST is not a direct replacement for the 93C56A-E/ST due to fundamental differences in memory organization: the 'B' version is 128 × 16-bit, while the 'A' version is 256 × 8-bit. Software addressing, data packing, and instruction sequences must be revised to match the 16-bit word structure of the 93C56B-E/ST.
93C56B-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:
- 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-TSSOP
93C56B-E/ST FAQ
1.How can I place an order for 93C56B-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56B-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 93C56B-E/ST reliable?
The price and inventory of 93C56B-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 93C56B-E/ST is usually 5 days.
3.What payment methods are accepted for 93C56B-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56B-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56B-E/ST?
93C56B-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56B-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 93C56B-E/ST?
For technical support, including 93C56B-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56B-E/ST requirements.
6.How does Aetrix verify that 93C56B-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C56B-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 93C56B-E/ST meets industry standards.
7.What is the process for return or replacement of 93C56B-E/ST?
All 93C56B-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C56B-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 93C56B-E/ST part is unused and in its original packaging.
Return procedure for 93C56B-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C56B-E/ST Tags
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AT24C02C-XHM-T
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