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Microchip Technology 93LC56CX-I/SN
- Part No.:
- 93LC56CX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56CX-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,903
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Product details
Overview
93LC56CX-I/SN from Microchip Technology Inc. is a 2 Kbit low-voltage serial EEPROM with 128 × 16-bit organization, operating across 2.5–5.5 V supply and rated for industrial temperature (−40°C to +85°C). It features Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status signaling via DO pin. Used in microcontroller-based systems for parameter storage, calibration data retention, and configuration memory.
For engineers reviewing the 93LC56CX-I/SN datasheet, 93LC56CX-I/SN pinout, 93LC56CX-I/SN application, or 93LC56CX-I/SN equivalent, key selection criteria include its 16-bit word mode (ORG = VCC), 6 ms program cycle time, 1 million endurance cycles, 200-year data retention, and SOIC-8 (SN) package compatibility with legacy board layouts.
Technical Context
The 93LC56CX-I/SN implements a dedicated 16-bit memory organization (128 × 16) with no ORG pin functionality-confirmed by device marking "L56B" and "X" suffix indicating B-version. Its Microwire protocol uses rising-edge clocking for opcode/address/data input on DI and synchronous output on DO, with CS-controlled active selection and automatic Standby entry on CS low.
Internal logic enforces power-on write protection: device powers up in EWDS (Erase/Write Disable) state, requiring explicit EWEN command before any ERASE/WRITE/WRAL operation. All programming cycles-including ERAL and WRAL-are self-timed and initiate on CS falling edge (for LC-series), with DO pin repurposed as Ready/Busy indicator during execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 × 16-bit organization) |
| VCC range | 2.5 V to 5.5 V - supports mixed-voltage MCU interfaces without level shifters |
| Endurance | 1,000,000 erase/write cycles - enables frequent field updates in telemetry or calibration applications |
| Data retention | >200 years at 25°C - ensures long-term reliability in unattended embedded deployments |
| Program cycle time | 6 ms (TWC) - defines minimum interval between successive write operations |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, compatible with legacy PIC® and 8051 controllers |
| Temp grade | Industrial (−40°C to +85°C) - validated for factory automation, industrial HMI, and motor control environments |
| Package | 8-lead SOIC (SN) - standard footprint, 150-mil width, Pb-free Matte Tin finish |
Pinout & Package
8-lead SOIC (SN) package per Microchip DS21794G, 150-mil body width, Pb-free Matte Tin finish, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed programming on falling edge |
| 2 CLK | Serial Clock | Rising-edge synchronized I/O; clocking stops during auto-erase/write; no CLK required post-initiation |
| 3 DI | Data Input | Accepts Start bit, opcode, address, and 16-bit data; high-impedance when not selected |
| 4 DO | Data Output / Status | Outputs 16-bit read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 VSS | Ground | Reference return for all signals; must be low-impedance connection to minimize noise coupling |
| 6 NC | No Connection | Internally unconnected; must remain floating or tied to ground per layout best practice |
| 7 NC | No Connection | Internally unconnected; no external connection required |
| 8 VCC | Power Supply | 2.5–5.5 V input; internal POR circuit triggers at ~1.5 V; requires local 0.1 µF decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC = 6 ms |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data corruption |
| Power-on/off data protection | Hardware-enforced write inhibition below VCC = 1.5 V prevents accidental writes during brownout |
| Ready/Busy status on DO | Enables real-time polling without additional pins-critical for interrupt-driven firmware designs |
| 128 × 16-bit fixed organization | Optimizes byte-aligned MCU access for 16-bit peripherals (e.g., ADC result registers, PWM duty cycles) |
| Industry-standard 3-wire interface | Reduces MCU GPIO count vs. SPI; compatible with existing Microwire drivers in RTOS BSPs |
Applications
| Motor Control Configuration | Medical Device Calibration Storage |
|---|---|
Use Scenario: Storing PID coefficients, current limits, and encoder zero-offset values in brushless DC motor drives. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed at startup and updated during field service via UART-commanded write sequences. Use Value: Enables plug-and-play motor replacement with retained tuning; 1M endurance supports >100 field recalibrations over product lifetime. | Use Scenario: Retaining sensor gain/offset corrections and patient-specific therapy parameters in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, low-power parameter vault accessed only during boot and maintenance mode; isolated from main processor bus. Use Value: Meets IEC 62304 Class C data integrity requirements; 200-year retention eliminates recalibration drift concerns in 10-year device lifecycles. |
| Industrial PLC I/O Module Settings | Automotive Body Control Unit NVM |
Use Scenario: Holding channel scaling factors, alarm thresholds, and communication baud rates in DIN-rail mounted analog input modules. IC Role / Device Role / Timing Role: Dedicated configuration store interfaced directly to ARM Cortex-M4's GPIO-controlled Microwire peripheral. Use Value: Eliminates need for external SPI flash; SOIC-8 footprint matches legacy PCBs, enabling drop-in upgrade from 93LC56B-I/SN. | Use Scenario: Saving seat position memory, mirror fold settings, and lighting profiles in 12 V automotive body controllers. IC Role / Device Role / Timing Role: Low-quiescent-current NVM powered from always-on 5 V rail; accessed during ignition-on initialization. Use Value: 2.5 V min VCC tolerance accommodates battery voltage sag during cranking; industrial temp rating covers under-hood thermal stress. |
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/SN | Identical 128×16 organization, same SOIC-8 package, identical timing and electrical specs; "B" suffix confirms fixed 16-bit mode | No functional difference; "X" in 93LC56CX-I/SN denotes same B-version silicon with alternate marking convention | Select 93LC56B-I/SN if sourcing from distributors with legacy stock; both are functionally and pinout-identical. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256×8), 1.8–5.5 V, 5 ms write cycle, 1M endurance; no Ready/Busy pin-relies on WIP polling | Requires SPI-capable MCU GPIO; lacks DO-based status signaling, increasing firmware complexity for write confirmation | Choose only if migrating to SPI architecture; not pin-compatible or protocol-compatible with 93LC56CX-I/SN. |
Compared with 93LC56B-I/SN, the 93LC56CX-I/SN offers identical functionality and drop-in compatibility; versus AT25020B-MAHL-T, it retains Microwire simplicity and hardware-ready signaling but requires no SPI peripheral allocation or software polling loops.
Availability
93LC56CX-I/SN is available at Aetrix Electronics and suitable for motor control configuration, medical device calibration storage, industrial PLC I/O module settings, and automotive body control unit NVM requiring stable component supply across extended production lifecycles.
Supply support for 93LC56CX-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.
The 93LC56CX-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal interface overhead.
FAQ
What is the memory organization of the 93LC56CX-I/SN?
The 93LC56CX-I/SN has a fixed 128 × 16-bit organization, confirmed by its "B"-version designation and absence of functional ORG pin. It stores 2,048 bits across 128 addresses, each holding 16 data bits. This differs from "A" versions (256 × 8) and "C" versions (pin-selectable 8/16-bit). The "X" suffix in 93LC56CX-I/SN indicates the same die as 93LC56B-I/SN, with alternate marking.
Does the 93LC56CX-I/SN require an external pull-up resistor on the DO pin?
No, the 93LC56CX-I/SN does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z state when deselected (CS low) or idle. A pull-up would conflict with active drive and is unnecessary per DS21794G Section 2.2 and Figure 2-7 timing diagrams.
What is the minimum VCC required to execute a WRITE command on the 93LC56CX-I/SN?
The minimum VCC required to execute a WRITE command on the 93LC56CX-I/SN is 2.5 V, as specified in the Device Selection Table for 93LC56B variants. Below 2.5 V, the internal power-on reset (POR) circuit inhibits all programming functions-even if EWEN is issued-to prevent incomplete or corrupted writes during brownout conditions.
Can the 93LC56CX-I/SN be used in place of the 93LC56B-I/SN?
Yes, the 93LC56CX-I/SN can be used in place of the 93LC56B-I/SN. Both share identical 128 × 16-bit organization, SOIC-8 (SN) package, electrical specifications, timing parameters (including 6 ms TWC), and industrial temperature rating. The "X" suffix reflects Microchip's internal marking variant for the same B-version silicon, making them functionally and physically interchangeable.
How does the Ready/Busy status work on the 93LC56CX-I/SN DO pin?
The DO pin of the 93LC56CX-I/SN outputs Ready/Busy status during erase/write cycles: logical '0' indicates ongoing programming, logical '1' indicates completion. To read status, CS must be brought high for ≥250 ns after initiating the command; DO returns to High-Z on CS falling edge. This eliminates need for external status lines or fixed delay loops in firmware.
93LC56CX-I/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:
- 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:
- 3 MHz
- Write Cycle Time - Word, Page:
- 6ms
- 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
93LC56CX-I/SN FAQ
1.How can I place an order for 93LC56CX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56CX-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 93LC56CX-I/SN reliable?
The price and inventory of 93LC56CX-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 93LC56CX-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC56CX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56CX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56CX-I/SN?
93LC56CX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56CX-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 93LC56CX-I/SN?
For technical support, including 93LC56CX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56CX-I/SN requirements.
6.How does Aetrix verify that 93LC56CX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56CX-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 93LC56CX-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC56CX-I/SN?
All 93LC56CX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56CX-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 93LC56CX-I/SN part is unused and in its original packaging.
Return procedure for 93LC56CX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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