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Microchip Technology 93LC56XT/SN
- Part No.:
- 93LC56XT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56XT/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,635
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Product details
Overview
93LC56XT/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8 or 128 × 16) low-voltage serial EEPROM with Microwire™ interface, ORG-pin-selectable memory organization, and industrial temperature range (–40°C to +85°C). It operates down to 2.5 V, features self-timed erase/write cycles, 1 million endurance cycles, and >200-year data retention - used for configuration storage in embedded controllers and power management ICs.
For engineers reviewing the 93LC56XT/SN datasheet, 93LC56XT/SN pinout, 93LC56XT/SN application, or 93LC56XT/SN equivalent, key selection criteria include voltage compatibility (2.5–5.5 V), 3-wire serial timing margins (e.g., TCKH/TCKL ≥250 ns), ORG pin logic dependency, and status polling via DO during WRAL/ERAL operations.
Technical Context
The 93LC56XT/SN implements a synchronous 3-wire Microwire-compatible interface with CS, CLK, DI, and DO lines. Its internal architecture includes an address decoder, data register, and memory array with auto-erase-before-write functionality. The ORG pin selects between x8 (256-word) and x16 (128-word) configurations at power-up or runtime.
It supports instruction-level control including READ, WRITE, ERASE, EWEN/EWDS, ERAL, and WRAL - all initiated by a start bit followed by opcode and address/data. Device status is reported on DO during programming cycles (low = busy, high = ready), requiring CS reassertion after minimum TCSL (250 ns) to sample.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 or 128 × 16 bits), configurable via ORG pin - enables flexible byte/word addressing in space-constrained designs. |
| Supply voltage | 2.5 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Interface | Industry-standard 3-wire Microwire™ (CS/CLK/DI/DO) - compatible with legacy MCU peripherals and reduces PCB routing complexity. |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in frequent configuration update scenarios (e.g., calibration data logging). |
| Data retention | Greater than 200 years at 25°C - guarantees nonvolatile storage integrity across product lifecycles without refresh. |
| Operating temperature | –40°C to +85°C (Industrial grade) - validated for use in automotive body electronics and industrial control modules. |
| Write cycle time | 4 ms typical per word (TWC), 16 ms typical for WRAL - defines minimum command interval and impacts firmware timeout design. |
Pinout & Package
8-pin SOIC (SN) package per JEDEC MS-012, narrow 150-mil body, Pb-free matte tin finish. Pin 1 marked by notch or dot; pin numbering follows standard SOIC convention (counterclockwise from notch).
| 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 and prevent spurious commands. |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence for master flexibility. |
| 3 (DI) | Data Input | Accepts start bit, opcode, address, and write data; tied to DO only if bus conflict mitigation (e.g., pull-up) is implemented. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when not active; requires external pull-up for reliable status reads. |
| 5 (VSS) | Ground | Reference return path for all signals; must be low-impedance to minimize noise coupling into sensitive serial timing. |
| 6 (ORG) | Memory Organization | Selects x8 (VSS) or x16 (VCC) mode; floating allowed only ≤1 MHz in x16 mode - critical for clock domain planning. |
| 7 (NU) | No Connect | Not internally bonded; must remain unconnected to avoid parasitic coupling or ESD path issues. |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; internal power-on/off protection inhibits programming until VCC >1.4 V - prevents corruption during brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - simplifies firmware by removing wait-state loops for TWC (4 ms) or WRAL (16 ms). |
| Auto-erase before write | Guarantees clean write operation without separate ERASE command - reduces command overhead and minimizes risk of partial writes. |
| Power-on/off data protection | Hardware-enforced inhibition below 1.4 V - prevents accidental corruption during power ramp-up/down in battery-backed systems. |
| Sequential read mode | Enables continuous data streaming while CS remains high - improves throughput for bulk configuration reads (e.g., bootloader parameter tables). |
| EWEN/EWDS security | Explicit enable/disable of programming functions - prevents unintended writes during normal operation or debug sessions. |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in HVAC controllers and pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed at boot; ORG pin set to x16 for compact coefficient packing. Use Value: Enables field-replaceable sensor modules without firmware reflash; 200-year retention avoids recalibration over equipment lifetime. |
Use Scenario: Holding user-defined I/O mapping, communication protocol settings, and watchdog timeouts in PLC I/O modules. IC Role / Device Role / Timing Role: Serial configuration store interfaced to ARM Cortex-M SPI peripheral emulating Microwire timing. Use Value: Reduces BOM count vs. parallel EEPROM; 2.5 V operation allows direct connection to 3.3 V MCU GPIOs. |
| Power Management IC Settings | Consumer Appliance State Memory |
Use Scenario: Saving dynamic voltage/frequency scaling profiles and fault history logs in DC-DC controller ICs. IC Role / Device Role / Timing Role: Low-power configuration memory; standby current of 3 µA at 2.5 V extends battery life in backup modes. Use Value: Supports energy harvesting applications where quiescent current directly impacts operational uptime. |
Use Scenario: Retaining user preferences (e.g., cooking time, temperature presets) and error codes across power cycles in microwave ovens. IC Role / Device Role / Timing Role: System-level nonvolatile storage; WRAL instruction used for full-table updates during firmware upgrades. Use Value: 1M endurance withstands daily usage over 10+ years; industrial temp rating ensures reliability near heating elements. |
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 | Pin-compatible revision with enhanced ESD robustness (≥4 kV HBM) and updated AC timing specs; same 2 Kbit capacity and SOIC-8 package. | Preferred for new designs requiring higher reliability in noisy industrial environments; supports identical ORG/x8/x16 configuration. | Select 93LC56C-I/SN for production releases; 93LC56XT/SN remains valid for legacy board reuse where footprint and timing match. |
| AT25020B-MAU-10-T | 2 Kbit SPI EEPROM (8-pin SOIC), 1.8–5.5 V supply, 20 MHz max clock; lacks ORG pin and WRAL/ERAL instructions. | Requires firmware adaptation for SPI protocol stack; no hardware-configurable organization - fixed 256 × 8 layout. | Choose AT25020B-MAU-10-T only when migrating to SPI-based platforms; verify timing compatibility with existing CS/CLK control logic. |
Compared with 93LC56XT/SN, the 93LC56C-I/SN offers improved manufacturability and ESD margin without layout changes, while the AT25020B-MAU-10-T trades Microwire simplicity for higher-speed SPI but sacrifices hardware organization flexibility and bulk-erase capability.
Availability
93LC56XT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and power management IC settings requiring stable component supply and long-term obsolescence support.
Supply support for 93LC56XT/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 memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56XT/SN belongs to Microchip's legacy 93LCxx serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring simple 3-wire nonvolatile storage with hardware-configurable memory mapping.
FAQ
What is the function of the ORG pin on the 93LC56XT/SN?
The ORG pin on the 93LC56XT/SN selects memory organization: tied to VCC enables 128 × 16-bit mode, tied to VSS enables 256 × 8-bit mode. It must be hardwired (not floated) for clock speeds above 1 MHz. This pin determines address width and data word size, directly affecting how firmware accesses stored parameters - for example, calibration coefficients may be packed more efficiently in x16 mode. The 93LC56XT/SN requires correct ORG biasing before any instruction execution.
How does the 93LC56XT/SN indicate readiness after a write operation?
The 93LC56XT/SN uses its DO pin to signal readiness: during WRAL or WRITE, DO outputs low while programming is active and transitions high upon completion. To poll status, CS must be brought high for ≥250 ns after the initial command, then sampled on subsequent CLK edges. This Ready/Busy mechanism eliminates need for fixed delays - firmware can proceed immediately upon detecting DO high. The 93LC56XT/SN does not require external timers for write synchronization.
Can the 93LC56XT/SN operate reliably at 2.5 V?
Yes, the 93LC56XT/SN is fully specified for operation at 2.5 V, including active read current (100 µA typ), standby current (3 µA typ), and AC timing (e.g., FCLK = 1 MHz min). All DC and AC parameters in DS21712C are guaranteed across 2.5–5.5 V, making it suitable for battery-powered or low-voltage microcontroller interfaces. The 93LC56XT/SN maintains 1M endurance and >200-year data retention even at minimum VCC, with built-in power-on protection activating below 1.4 V.
What is the purpose of the NU pin on the 93LC56XT/SN?
Pin 7 of the 93LC56XT/SN is labeled NU (No Connect) and is not internally bonded - it must remain unconnected on the PCB. Routing traces to or placing components near this pin risks parasitic capacitance or ESD coupling that could disrupt adjacent signal integrity, especially on CLK or DO. The 93LC56XT/SN datasheet explicitly prohibits connecting NU to VCC, VSS, or any other net; doing so may cause unpredictable behavior or reduced reliability.
Is the 93LC56XT/SN compatible with modern SPI peripherals?
The 93LC56XT/SN uses Microwire™, not SPI: it requires strict start-bit detection (CS and DI high on first CLK rising edge), lacks MISO/MOSI separation, and relies on DO for both data output and status. While some SPI peripherals can emulate Microwire timing, clock polarity/phase settings (CPOL/CPHA) do not map directly. Firmware must implement start-bit generation and status polling per DS21712C - the 93LC56XT/SN cannot be treated as a drop-in SPI EEPROM replacement without protocol layer adaptation.
93LC56XT/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not 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
93LC56XT/SN FAQ
1.How can I place an order for 93LC56XT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56XT/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 93LC56XT/SN reliable?
The price and inventory of 93LC56XT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56XT/SN is usually 5 days.
3.What payment methods are accepted for 93LC56XT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56XT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56XT/SN?
93LC56XT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56XT/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 93LC56XT/SN?
For technical support, including 93LC56XT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56XT/SN requirements.
6.How does Aetrix verify that 93LC56XT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56XT/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 93LC56XT/SN meets industry standards.
7.What is the process for return or replacement of 93LC56XT/SN?
All 93LC56XT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56XT/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 93LC56XT/SN part is unused and in its original packaging.
Return procedure for 93LC56XT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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