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Microchip Technology 93LC56XT-I/SN
- Part No.:
- 93LC56XT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56XT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,916
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Product details
Overview
93LC56XT-I/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8 or 128 × 16) low-voltage serial EEPROM with Microwire™ interface, operating from 2.5 V to 5.5 V, featuring 1,000,000 erase/write cycles and >200-year data retention. It uses an 8-pin SOIC package with ORG pin-selectable memory organization and supports industrial temperature range (−40°C to +85°C). It is commonly used for configuration storage in embedded controllers and power management ICs.
For engineers reviewing the 93LC56XT-I/SN datasheet, 93LC56XT-I/SN pinout, 93LC56XT-I/SN application, or 93LC56XT-I/SN equivalent, key selection considerations include its 2.5 V minimum operating voltage, self-timed erase/write cycles, 3-wire serial interface timing compliance, and compatibility with legacy Microwire-based host firmware stacks.
Technical Context
The 93LC56XT-I/SN implements a synchronous 3-wire Microwire-compatible serial interface with CS, CLK, DI, and DO lines. Its internal logic decodes 8-bit opcodes (e.g., READ=10b, WRITE=01b) and supports both x8 and x16 memory organizations selected via the ORG pin.
It features hardware-level power-on/off data protection, automatic ERAL before WRAL, and device status signaling via DO pin during programming - enabling polling-based readiness detection without external timers. All erase/write operations are fully self-timed and require no external clocking after CS fall.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 or 128 × 16), configurable via ORG pin - enables flexible byte- or word-oriented storage layouts |
| Supply voltage | 2.5 V to 5.5 V - supports direct connection to 3.3 V and 5 V logic rails without level shifters |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in frequent configuration update scenarios |
| Data retention | >200 years at 25°C - guarantees nonvolatile storage integrity across product lifecycles |
| Active read current | 100 µA typical at 2.5 V - minimizes system power draw during parameter reads |
| Standby current | 3 µA typical at 2.5 V - enables ultra-low-power sleep-mode operation |
| Write cycle time | 4 ms per word typical - defines worst-case latency for single-word updates |
| Interface standard | Microwire™ 3-wire serial (CS/CLK/DI/DO) - ensures interoperability with legacy microcontrollers supporting this protocol |
Pinout & Package
8-pin SOIC (SN) package per JEDEC MS-012, 150 mil body width, surface-mount compatible. Pin 1 marked by notch or dot; pin numbering follows standard SOIC convention (counterclockwise from notch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable signal; must be held high for instruction execution and low ≥250 ns between commands |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks opcode/address/data; stoppable mid-sequence |
| DI (Pin 3) | Data Input | Receives start bit, opcode, address, and write data; requires setup/hold timing relative to CLK |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when inactive or after CS fall |
| VSS (Pin 5) | Ground | Reference return path for all signals and internal circuitry |
| ORG (Pin 6) | Memory Organization | Connect to VCC for 128 × 16 mode or VSS for 256 × 8 mode; must be fixed (not floated) above 1 MHz |
| NU (Pin 7) | No Connect | Internally unconnected; must remain floating or tied to VSS/VCC per board layout best practice |
| VCC (Pin 8) | Power Supply | Accepts 2.5–5.5 V; includes on-chip power-on reset and brown-out protection circuitry |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin memory configuration | Enables runtime selection between 256×8 and 128×16 layouts without changing firmware or PCB design |
| Self-timed erase/write cycles | Eliminates need for external timing control or software delays - simplifies driver implementation |
| Power-on/off data protection | Hardware-enforced inhibition of programming below 1.4 V prevents corruption during supply ramp-up/down |
| Sequential read function | Allows continuous multi-byte reads with single CS assertion - reduces transaction overhead in configuration dumps |
| Status polling via DO pin | Enables real-time readiness verification during WRAL/ERAL without dedicated status registers or interrupts |
| Industry-standard Microwire interface | Ensures drop-in compatibility with existing 3-wire SPI-like peripherals and legacy MCU firmware drivers |
Applications
| Industrial Sensor Calibration | Embedded Power Management |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and temperature compensation tables in smart transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed infrequently during calibration or startup; operates at ≤1 MHz clock rate. Use Value: Enables field-replaceable sensor modules with persistent calibration data independent of main controller firmware. | Use Scenario: Holding dynamic power state parameters (e.g., rail sequencing order, fault thresholds, soft-start times) in DC-DC controller boards. IC Role / Device Role / Timing Role: Configuration store for PMIC initialization; accessed once per power cycle using 2.5 V supply rail. Use Value: Supports customizable power-up behavior without modifying controller silicon or requiring external OTP fuses. |
| Legacy MCU Bootloader Storage | Consumer Appliance UI Settings |
Use Scenario: Storing bootloader version, secure boot keys, and firmware update flags in 8-bit microcontroller-based systems with Microwire peripherals. IC Role / Device Role / Timing Role: Secure configuration vault; accessed only during reset or firmware update; uses EWEN/EWDS for write protection. Use Value: Provides tamper-resistant storage for critical boot parameters without requiring cryptographic co-processors. | Use Scenario: Retaining user preferences (brightness, timer, language) across AC power cycles in white goods and HVAC controls. IC Role / Device Role / Timing Role: Low-power settings register; written only on menu change; read at power-on with 3 µA standby current. Use Value: Eliminates battery-backed SRAM while maintaining instant recall of user settings after extended power loss. |
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 | Same pinout and instruction set; improved ESD rating (≥4 kV HBM vs. unspecified in 93LC56XT); enhanced data retention spec at elevated temperature | Preferred for new designs requiring higher robustness; not drop-in in systems relying on undocumented timing margins of original silicon | Select 93LC56C-I/SN for production releases where long-term availability and qualification stability are required. |
| AT25020B-MAU-1.8 | SPI interface (4-wire), 2.5 V–5.5 V supply, 2 Kbit density; lacks ORG pin and Microwire compatibility; supports faster 20 MHz clock | Requires firmware rewrite to replace Microwire with SPI; suitable only when host MCU lacks Microwire peripheral but has SPI with hardware CS control | Choose AT25020B-MAU-1.8 only if migrating from Microwire to SPI architecture and board layout allows re-routing DO/CS lines. |
Compared with 93LC56XT-I/SN, the 93LC56C-I/SN offers verified lifecycle support and tighter parametric guarantees, while the AT25020B-MAU-1.8 trades protocol compatibility for higher speed and broader vendor support - making the former ideal for legacy continuity and the latter for greenfield SPI-based designs.
Availability
93LC56XT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, and legacy MCU bootloader storage requiring stable component supply and long-term obsolescence planning.
Supply support for 93LC56XT-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 93LC56XT-I/SN belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring simple, reliable nonvolatile storage with minimal pin count and firmware overhead.
FAQ
What is the maximum clock frequency supported by the 93LC56XT-I/SN?
The 93LC56XT-I/SN supports up to 2 MHz clock frequency when VCC ≥ 4.5 V, and 1 MHz when VCC < 4.5 V. These limits are defined in the AC Characteristics table (Param No. 1, FCLK) of the DS21712C datasheet and reflect guaranteed timing margins across the full industrial temperature range. Exceeding these frequencies may result in unreliable opcode decoding or data corruption during write operations. The 93LC56XT-I/SN does not support higher speeds even with tighter layout or lower load capacitance.
How does the ORG pin affect memory addressing in the 93LC56XT-I/SN?
The ORG pin determines whether the 93LC56XT-I/SN operates in 256 × 8-bit (ORG = VSS) or 128 × 16-bit (ORG = VCC) configuration. In x8 mode, addresses range from 0x00 to 0xFF (8-bit address field); in x16 mode, addresses range from 0x00 to 0x7F (7-bit address field), with each access retrieving two bytes. This mapping is fixed per power cycle and directly affects instruction encoding - for example, READ requires 18 CLK cycles in x8 mode versus 27 in x16 mode. The 93LC56XT-I/SN datasheet Tables 1-4 and 1-3 confirm these distinct timing and address-width requirements.
Can the 93LC56XT-I/SN be used with a 1.8 V supply?
No, the 93LC56XT-I/SN is not rated for 1.8 V operation. Its absolute minimum supply voltage is 2.5 V, as specified in the "Single supply with programming operation down to 2.5 V" feature list and confirmed in the DC CHARACTERISTICS section (VCC = +2.5 V to +5.5 V). Attempting to operate the 93LC56XT-I/SN at 1.8 V will result in undefined behavior, including failure to recognize start conditions, incorrect opcode decoding, or inability to complete erase/write cycles. For 1.8 V systems, Microchip recommends the 93LC56B variant or alternative SPI EEPROMs with 1.7–1.95 V support.
What is the purpose of the NU pin on the 93LC56XT-I/SN?
The NU (No Connect) pin (Pin 7) on the 93LC56XT-I/SN is internally unconnected and serves no electrical function. It must be left floating in the PCB layout; tying it to VCC or VSS is unnecessary and may introduce unintended coupling paths. This pin exists solely for mechanical symmetry and package compatibility within the 8-pin SOIC footprint - a design choice consistent across the 93LC46/56/66 family. The 93LC56XT-I/SN datasheet explicitly states "NU – Not Utilized" in Table 3-1 and confirms no internal bond wire connection.
Does the 93LC56XT-I/SN support sequential read across memory boundaries?
Yes, the 93LC56XT-I/SN supports wraparound sequential read: when CS remains high, the internal address counter increments automatically after each byte or word is output, and rolls over from the last address (0xFF in x8 mode or 0x7F in x16 mode) back to address 0x00. This behavior is documented in Section 2.4 ("Read") of the DS21712C datasheet and enables efficient bulk reads without host-side address management. However, sequential read is only guaranteed within a single CS assertion - releasing CS terminates the sequence and resets the counter.
93LC56XT-I/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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56XT-I/SN FAQ
1.How can I place an order for 93LC56XT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56XT-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 93LC56XT-I/SN reliable?
The price and inventory of 93LC56XT-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 93LC56XT-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC56XT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56XT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56XT-I/SN?
93LC56XT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56XT-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 93LC56XT-I/SN?
For technical support, including 93LC56XT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56XT-I/SN requirements.
6.How does Aetrix verify that 93LC56XT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56XT-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 93LC56XT-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC56XT-I/SN?
All 93LC56XT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56XT-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 93LC56XT-I/SN part is unused and in its original packaging.
Return procedure for 93LC56XT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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