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Microchip Technology 93LC56/SN
- Part No.:
- 93LC56/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:593
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Product details
Overview
93LC56/SN from Microchip Technology Inc. is a 2 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, configurable as 256 × 8-bit or 128 × 16-bit memory via ORG pin, rated for -40°C to +85°C industrial operation and packaged in 8-lead SOIC (SN). It supports single-supply operation down to 2.5 V, delivers 100 µA typical active read current at 2.5 V, and ensures 1,000,000 erase/write cycles with >200-year data retention - used in embedded system configuration storage and calibration data logging.
For engineers reviewing the 93LC56/SN datasheet, 93LC56/SN pinout, 93LC56/SN application, or 93LC56/SN equivalent, this page provides verified technical context, validated pin functions, confirmed memory organization options, real-world timing constraints (e.g., 4 ms typical write cycle), and direct alternative part comparisons - all extracted from Microchip DS21712C and official package documentation.
Technical Context
The 93LC56/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO lines, where instruction execution is triggered by a Start condition (CS high + DI high on first CLK rising edge). Memory organization is dynamically selected via ORG pin voltage: VCC enables 128 × 16-bit mode; VSS enables 256 × 8-bit mode - both supported across full temperature range and supply voltage (2.5 V–5.5 V).
It features self-timed erase/write cycles with automatic ERAL before WRAL, device status reporting via DO pin (low = busy, high = ready), and power-on/off data protection that inhibits programming below 1.4 V. All operations require EWEN command prior to erase/write, and the device powers up in EWDS (Erase/Write Disable) state for safety.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8 or 128 × 16 organization) |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) |
| Supply Voltage | 2.5 V to 5.5 V - enables direct integration with 2.5 V, 3.3 V, and 5 V logic systems |
| Endurance | 1,000,000 erase/write cycles - sufficient for firmware parameter logging in field-deployed equipment |
| Data Retention | >200 years at 25°C - ensures long-term reliability in unattended applications like utility meters |
| Operating Temp | -40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor IoT nodes |
| Active Read Current | 100 µA typical at 2.5 V - minimizes quiescent power in battery-backed systems |
| Standby Current | 3 µA typical at 2.5 V - supports ultra-low-power sleep modes in portable devices |
Pinout & Package
8-lead SOIC (SN) package per JEDEC MS-012, 150 mil width, with standard pinout (non-rotated) as specified for 93LC56-I/SN variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal logic |
| 2 CLK | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; stoppable mid-sequence without corruption |
| 3 DI | Data Input | Accepts Start bit, instruction opcodes, addresses, and write data; tolerant of bus-sharing with DO under controlled conditions |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when inactive; requires pull-up for reliable status polling |
| 5 VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance |
| 6 ORG | Memory Organization | Selects x8 (VSS) or x16 (VCC) mode; floating only permitted ≤1 MHz in x16 mode |
| 7 NU | No Connect | Internally unused; must remain unconnected or tied to VSS/VCC per board layout best practice |
| 8 VCC | Power Supply | 2.5 V–5.5 V input; includes on-chip power-on reset and brown-out protection below 1.4 V |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin configurable memory map | Enables hardware-selectable 256×8 or 128×16 layout without firmware changes or PCB redesign |
| Self-timed erase/write cycles | Eliminates need for external timing control - WRAL completes in 16 ms typical, ERAL in 8 ms typical |
| Ready/Busy status via DO pin | Allows non-blocking polling during programming; avoids fixed delay loops and improves system responsiveness |
| Power-on/off data protection | Hardware-enforced lockout below 1.4 V prevents corruption during brown-out or hot-plug events |
| EWEN/EWDS security commands | Prevents accidental writes: device powers up in EWDS state; explicit EWEN required before any erase/write |
| Sequential read capability | Enables fast bulk reads (e.g., calibration tables) by holding CS high and clocking consecutive addresses |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and user-adjusted trim values in HVAC controllers and pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during startup or service mode via Microwire interface. Use Value: Maintains accuracy over 200+ years without backup battery; 2.5 V operation matches low-power MCU supply rails. |
Use Scenario: Saving user preferences (temperature setpoints, cycle selections, language) in washing machines and microwave ovens. IC Role / Device Role / Timing Role: Serial EEPROM interfaced to 8-bit microcontroller GPIO pins using bit-banged Microwire protocol. Use Value: 1M endurance supports daily rewrites for 2,700+ years; 3 µA standby current extends appliance standby life. |
| Automotive Body Control Module | Medical Device Usage Logs |
|
Use Scenario: Recording door lock actuation history, mirror position memory, and lighting timeout settings in BCMs. IC Role / Device Role / Timing Role: Secondary nonvolatile storage for infrequently updated operational parameters alongside main MCU flash. Use Value: -40°C to +85°C rating meets AEC-Q100 Grade 3 requirements; 4 ms write time enables fast save-on-exit. |
Use Scenario: Logging sterilization cycles, usage counts, and error events in portable diagnostic instruments. IC Role / Device Role / Timing Role: Tamper-resistant event logger with status-polling support to confirm write completion before power removal. Use Value: DO pin status feedback ensures data integrity in battery-powered devices where power loss is unpredictable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56C-I/SN | Enhanced revision with improved ESD robustness (≥4 kV HBM), same pinout and instruction set | Preferred for new designs requiring higher reliability in noisy industrial environments | Select 93LC56C-I/SN when long-term supply continuity and enhanced latch-up immunity are required |
| AT25020B-MAU-10 | SPI interface (4-wire), 2 Kbit, 1.8 V–5.5 V, 20 MHz max clock, no ORG pin - fixed 256×8 organization | Requires different firmware driver and PCB routing (additional /CS line); lacks hardware-configurable word size | Choose AT25020B-MAU-10 only if SPI is already standardized in the system and ORG flexibility is unnecessary |
Compared with 93LC56/SN, the 93LC56C-I/SN offers identical functionality with documented reliability improvements, while the AT25020B-MAU-10 trades Microwire compatibility and ORG configurability for higher-speed SPI access - making it suitable only when interface standardization outweighs hardware flexibility needs.
Availability
93LC56/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive body control module applications requiring stable component supply, long-life nonvolatile storage, and proven legacy design support.
Supply support for 93LC56/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 components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 93LC56/SN belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing simple 3-wire nonvolatile storage with hardware-configurable memory mapping.
FAQ
What is the memory organization of 93LC56/SN and how is it selected?
The 93LC56/SN supports two memory organizations: 256 × 8-bit or 128 × 16-bit. Selection is controlled by the ORG pin - tied to VSS for x8 mode, VCC for x16 mode. This hardware-based configuration eliminates firmware overhead and ensures deterministic addressing. The 93LC56/SN datasheet confirms both modes operate across the full -40°C to +85°C range and 2.5 V–5.5 V supply.
Does 93LC56/SN support sequential read, and how is it implemented?
Yes, 93LC56/SN supports sequential read: after issuing a READ instruction, holding CS high allows automatic incrementing of the internal address counter, outputting consecutive memory locations on each CLK rising edge. This feature reduces software overhead for bulk data retrieval. The 93LC56/SN functional description specifies that sequential read is enabled only when CS remains asserted throughout the operation.
What is the purpose of the NU pin on 93LC56/SN, and how should it be handled?
Pin 7 of the 93LC56/SN is labeled NU (No Connect) and is internally unused. Per Microchip DS21712C, it must not be connected to any signal or power rail. Best practice is to leave it floating or tie it to VSS/VCC only if required by PCB layout rules - but never drive it actively. Incorrect connection may cause undefined behavior or increased leakage, as confirmed in the Pin Function Table.
How does 93LC56/SN indicate readiness during erase or write operations?
The 93LC56/SN uses the DO pin to signal Ready/Busy status: DO = low indicates ongoing erase/write; DO = high confirms completion. This polling mechanism requires CS to be brought high for ≥250 ns after TCSL, and a pull-up resistor on DO is mandatory for reliable high-level detection. The 93LC56/SN AC characteristics specify TSV (Status Valid time) as ≤500 ns, enabling responsive system-level synchronization.
Is 93LC56/SN compatible with modern 1.8 V systems?
No, 93LC56/SN is not guaranteed for 1.8 V operation. Its absolute minimum supply voltage is 2.5 V, with DC characteristics specified from 2.5 V to 5.5 V. While some units may function at 1.8 V under lab conditions, Microchip DS21712C explicitly defines VCC ≥2.5 V as the operational limit. For 1.8 V systems, consider newer alternatives like the 93LC56C-I/SN with extended characterization or SPI-based EEPROMs rated for 1.7 V–5.5 V.
93LC56/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, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56/SN FAQ
1.How can I place an order for 93LC56/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56/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 93LC56/SN reliable?
The price and inventory of 93LC56/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56/SN is usually 5 days.
3.What payment methods are accepted for 93LC56/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56/SN?
93LC56/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56/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 93LC56/SN?
For technical support, including 93LC56/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56/SN requirements.
6.How does Aetrix verify that 93LC56/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56/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 93LC56/SN meets industry standards.
7.What is the process for return or replacement of 93LC56/SN?
All 93LC56/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56/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 93LC56/SN part is unused and in its original packaging.
Return procedure for 93LC56/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56/SN Tags
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