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Microchip Technology 93LC56BX/SN
- Part No.:
- 93LC56BX/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56BX/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,591
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Product details
Overview
93LC56BX/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin. Used for configuration storage in microcontroller-based embedded systems requiring nonvolatile parameter retention.
For engineers reviewing the 93LC56BX/SN datasheet, 93LC56BX/SN pinout, 93LC56BX/SN application, or 93LC56BX/SN equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), SOIC-8 package, 1 million erase/write endurance, >200-year data retention, and compatibility with legacy Microwire host controllers.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins operating at up to 3 MHz (VCC ≥ 4.5 V). It uses a fixed 8-bit word organization-no ORG pin present-making it functionally distinct from C-variant parts. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are executed via 12-clock-cycle sequences for x8 mode.
Power-on data protection is enforced by internal voltage detection (VPOR = 1.5 V typical); write operations require prior EWEN command and are inhibited below VCC threshold. Standby current is ≤1 µA (I-temp), and write current peaks at 2 mA (VCC = 2.5 V, FCLK = 2 MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin; no word-size reconfiguration |
| VCC range | 2.5 V to 5.5 V - supports wide-input industrial power rails; VPOR = 1.5 V ensures reliable POR lockout |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V; enables long-life field calibration storage |
| Data retention | >200 years - specified at 25°C; guarantees firmware parameter integrity over product lifetime |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - no SPI mode; requires external CS management |
| Max clock frequency | 3 MHz (VCC ≥ 4.5 V), 2 MHz (2.5 V ≤ VCC < 4.5 V) - defines minimum instruction latency (e.g., WRITE = 20 clocks) |
| Operating temp | –40°C to +85°C (Industrial grade) - qualified per I-temp spec; suitable for industrial control and automotive body modules |
Pinout & Package
93LC56BX/SN is supplied in 8-lead SOIC (SN) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. The ORG pin is absent (A-variant), and Pins 6 & 7 are unconnected - must be left floating or tied to VSS per layout best practice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed write on falling edge |
| 2 - CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 - DI | Data Input | Accepts Start bit, opcode, address, and write data; high-impedance when not selected |
| 4 - DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 - VSS | Ground | Reference for all I/O and internal logic; requires low-impedance PCB plane |
| 6 - NC | No Connection | Internally unconnected; leave floating or tie to VSS for noise immunity |
| 7 - NC | No Connection | Internally unconnected; same handling as Pin 6 |
| 8 - VCC | Power Supply | 2.5–5.5 V input; bypass with 0.1 µF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control; TWC = 6 ms max (ERAL = 6 ms, WRAL = 15 ms) |
| Automatic ERAL before WRAL | Ensures full array erasure prior to bulk write; prevents partial-data corruption during firmware updates |
| Ready/Busy status on DO | Enables polling-based host synchronization without interrupt or timer overhead |
| EWEN/EWDS write protection | Hardware-level security against accidental writes; device powers up in EWDS state |
| Power-on/off data protection | Internal voltage detector disables writes below VPOR (1.5 V), preventing bit corruption during brownout |
Applications
| Motor Control Configuration | Industrial Sensor Calibration |
|---|---|
Use Scenario: Storing motor commutation tables, PID coefficients, and fault thresholds in BLDC driver modules. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime via Microwire interface. Use Value: Enables field-updatable tuning without firmware reflashing; 1M endurance supports >10 years of recalibration cycles. | Use Scenario: Retaining factory-calibrated offset/gain values and linearization coefficients for analog sensor front-ends. IC Role / Device Role / Timing Role: Dedicated 8-bit serial EEPROM interfaced to MCU ADC subsystem during initialization. Use Value: Eliminates need for external trimming components; >200-year retention ensures calibration validity across product lifecycle. |
| Smart Meter Firmware Parameters | Automotive Body Control Module |
Use Scenario: Holding tariff schedules, pulse constants, and communication protocol settings in utility meters. IC Role / Device Role / Timing Role: Low-power Microwire EEPROM accessed infrequently but requiring guaranteed data integrity. Use Value: 2.5 V min VCC allows operation directly from meter's regulated rail; 1 µA standby current extends battery life. | Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to 8-bit MCU via dedicated GPIO-controlled Microwire bus. Use Value: –40°C to +85°C rating matches under-hood ambient; NC pins simplify PCB routing in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B/SN | 128 × 16-bit organization; identical VCC range, timing, and package | Requires 16-bit host interface; incompatible with 8-bit software drivers | Select only if system architecture mandates 16-bit word access and firmware supports x16 opcodes |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz max clock | Requires SPI master instead of Microwire; different instruction set and status reporting | Choose for higher-speed or SPI-native designs; not drop-in replaceable due to protocol and pinout mismatch |
Compared with 93LC56B/SN, the 93LC56BX/SN provides native 8-bit compatibility without ORG pin management overhead; versus AT25020B-MAHL-T, it retains Microwire legacy support but trades speed and voltage flexibility for proven interoperability with older microcontrollers.
Availability
93LC56BX/SN is available at Aetrix Electronics and suitable for motor control configuration, industrial sensor calibration, and smart meter firmware parameters requiring stable component supply across extended production lifecycles.
Supply support for 93LC56BX/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 Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56 family belongs to Microchip's legacy Microwire-compatible serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring simple, robust nonvolatile storage without SPI complexity.
FAQ
What is the memory organization of the 93LC56BX/SN?
The 93LC56BX/SN is a fixed 256 × 8-bit (2 Kbit) EEPROM with no ORG pin. Unlike C-variant parts, it does not support x16 configuration - its organization is permanently x8. This simplifies host software design and eliminates external ORG pin biasing requirements. The "X" in the part number denotes the SOIC-8 (SN) package variant.
Does the 93LC56BX/SN require an EWEN command before every write operation?
Yes, the 93LC56BX/SN powers up in Erase/Write Disable (EWDS) mode. An EWEN instruction must be issued before any ERASE or WRITE command can execute. After successful programming, best practice is to issue EWDS to prevent accidental writes - this is enforced by the device's hardware protection logic, independent of MCU firmware state.
What is the function of Pins 6 and 7 on the 93LC56BX/SN SOIC package?
Pins 6 and 7 on the 93LC56BX/SN are No Connect (NC) terminals - they have no internal connection. Per Microchip's recommendation, these pins may be left floating or tied to VSS for improved noise immunity. They must never be driven or used as signal paths, as doing so violates the device's electrical specification and may cause undefined behavior.
Can the 93LC56BX/SN operate reliably at 2.5 V supply voltage?
Yes, the 93LC56BX/SN is fully specified for operation from 2.5 V to 5.5 V. At VCC = 2.5 V, maximum clock frequency is 2 MHz, write current is ≤2 mA, and standby current remains ≤1 µA. All AC/DC parameters - including TCKH, TCKL, TPD, and TWC - are guaranteed across this range per Industrial temperature grade (–40°C to +85°C).
How does the Ready/Busy status work on the DO pin of the 93LC56BX/SN?
The DO pin of the 93LC56BX/SN serves dual function: data output during READ, and Ready/Busy indicator during programming. After initiating ERASE/WRITE/WRAL, bring CS high for ≥250 ns, then sample DO - low = busy, high = ready. DO returns to High-Z on CS falling edge. Status polling avoids fixed-delay waits and adapts to actual process variation.
93LC56BX/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:
- 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- 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
93LC56BX/SN FAQ
1.How can I place an order for 93LC56BX/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56BX/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 93LC56BX/SN reliable?
The price and inventory of 93LC56BX/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56BX/SN is usually 5 days.
3.What payment methods are accepted for 93LC56BX/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56BX/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56BX/SN?
93LC56BX/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56BX/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 93LC56BX/SN?
For technical support, including 93LC56BX/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56BX/SN requirements.
6.How does Aetrix verify that 93LC56BX/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56BX/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 93LC56BX/SN meets industry standards.
7.What is the process for return or replacement of 93LC56BX/SN?
All 93LC56BX/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56BX/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 93LC56BX/SN part is unused and in its original packaging.
Return procedure for 93LC56BX/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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