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Microchip Technology 93LC56AT/SN
- Part No.:
- 93LC56AT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56AT/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,056
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Product details
Overview
93LC56AT/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 power-on/off data protection - deployed in embedded system configuration storage and sensor calibration memory.
For engineers reviewing the 93LC56AT/SN datasheet, 93LC56AT/SN pinout, 93LC56AT/SN application, or 93LC56AT/SN equivalent, key selection criteria include VCC operating range, 8-bit organization (no ORG pin), SOIC-8 package compatibility, Ready/Busy status signaling via DO, and endurance of 1 million erase/write cycles.
Technical Context
The 93LC56AT/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It operates exclusively in fixed 8-bit organization ('A' version), eliminating ORG pin dependency. All instructions - READ, WRITE, ERASE, ERAL, WRAL - are initiated by a Start bit followed by opcode, address, and data bits clocked on CLK rising edges.
Internal logic includes auto-erase-before-write, automatic ERAL prior to WRAL execution, and power-on reset circuitry that inhibits write operations below 1.5 V. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during programming - requiring CS high for ≥250 ns after TCSL to sample status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - supports compact nonvolatile storage for boot parameters or device IDs. |
| VCC operating range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic systems without level shifting. |
| Endurance | 1,000,000 erase/write cycles - suitable for field-updatable firmware metadata or frequent calibration logging. |
| Data retention | 200 years at 25°C - ensures long-term reliability in unattended industrial deployments. |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - minimal GPIO usage; no I²C pull-ups or SPI SS complexity. |
| Timing (TWC) | 6 ms typical erase/write cycle - enables predictable timeout handling in real-time firmware. |
| Temperature grade | Industrial (−40°C to +85°C) - validated for operation in factory automation and outdoor metering environments. |
Pinout & Package
93LC56AT/SN is supplied in 8-lead SOIC (SN) package per Microchip's standard footprint. Pin functions are fully defined in DS21794G, with no internal connection on Pin 7 (NC) and dedicated 8-bit organization (ORG pin not implemented).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data. |
| DI (Pin 3) | Data Input | Receives Start bit, instruction opcodes, memory addresses, and write data. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS is low. |
| VSS (Pin 5) | Ground | Reference for all digital and analog circuitry; requires low-impedance PCB return path. |
| NC (Pin 6) | No Connection | Internally unconnected; must remain floating or tied to ground per layout best practice. |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; bypass capacitor (0.1 µF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates external timing control; firmware only waits for DO high or uses fixed 6 ms timeout. |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write - prevents partial writes due to residual data. |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC prevents corruption during brown-out or hot-plug events. |
| Ready/Busy status on DO | Enables polling-based firmware flow without interrupt lines or additional GPIOs. |
| Sequential read mode | Reduces host CPU overhead: holding CS high auto-increments address across consecutive reads. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) Calibration |
|---|---|
Use Scenario: Storing I/O mapping tables, scaling coefficients, and user-defined logic configurations in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during startup and runtime reconfiguration; 6 ms write latency acceptable for infrequent updates. Use Value: Enables field-reprogrammability without replacing main controller; 200-year retention ensures lifetime data integrity across equipment service life. | Use Scenario: Holding trim values for door lock actuators, mirror position offsets, and ambient light sensor gain settings in BCMs. IC Role / Device Role / Timing Role: Dedicated calibration memory interfaced directly to microcontroller GPIOs; operates within −40°C to +85°C ambient range. Use Value: Eliminates need for MCU internal flash wear-leveling; 1M endurance supports dealer recalibration over vehicle lifetime. |
| Medical Infusion Pump Setup Data | Smart Energy Meter Firmware Metadata |
Use Scenario: Retaining drug library identifiers, dose limits, alarm thresholds, and audit trail timestamps in Class II medical devices. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration vault; power-loss protection prevents corruption during battery swaps. Use Value: Meets IEC 62304 data integrity requirements; Pb-free RoHS compliance supports global regulatory submissions. | Use Scenario: Storing firmware version stamps, cryptographic keys, tariff schedule tables, and tamper-event logs in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Trusted nonvolatile storage co-located with metrology SoC; accessed via isolated serial bus. Use Value: 2.5 V minimum VCC allows direct connection to meter's 3.3 V rail; SOIC-8 footprint simplifies automated assembly. |
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; same 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 addressing. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin. | Needs CS, SCK, SI, SO signals; relies on software delay or status register polling instead of DO pin. | Choose when migrating to SPI-based platforms or requiring faster clock rates than Microwire's 3 MHz limit. |
Compared with 93LC56B/SN and AT25020B-MAHL-T, the 93LC56AT/SN provides guaranteed 8-bit compatibility, hardware Ready/Busy signaling, and seamless integration into legacy Microwire-based designs - reducing firmware validation effort and avoiding interface translation logic.
Availability
93LC56AT/SN is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive BCM calibration, and medical infusion pump setup data requiring stable component supply across extended product lifecycles.
Supply support for 93LC56AT/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.
The 93LC56A/B/C series was designed specifically for cost-sensitive, low-power embedded systems needing reliable serial EEPROM with Microwire compatibility and robust data integrity features.
FAQ
What is the memory organization of the 93LC56AT/SN?
The 93LC56AT/SN is an 'A' version device with fixed 256 × 8-bit organization. It does not implement the ORG pin - unlike 'C' versions - and therefore always operates in 8-bit mode. This eliminates external configuration logic and simplifies host driver development for byte-oriented systems.
Does the 93LC56AT/SN support automatic erase before write?
Yes, the 93LC56AT/SN performs self-timed auto-erase before each WRITE or WRAL operation. This is inherent to its architecture and requires no separate ERASE command. The 6 ms typical TWC (program cycle time) includes both erase and write phases, ensuring data consistency without firmware intervention.
What is the purpose of the NC pin on the 93LC56AT/SN?
Pin 6 on the 93LC56AT/SN is labeled NC (No Connection) and has no internal connection. Per Microchip DS21794G, it must remain unconnected or tied to ground for mechanical stability - never driven high or used as a signal line. This distinguishes it from the ORG pin found on 'C' variants.
How is Ready/Busy status monitored on the 93LC56AT/SN?
Ready/Busy status is signaled on the DO pin: logic low indicates ongoing erase/write, logic high indicates completion. To sample this, CS must be brought high for ≥250 ns after TCSL (minimum CS low time); DO then transitions from High-Z to active status. After completion, issuing a Start bit and lowering CS clears the status flag.
Is the 93LC56AT/SN RoHS compliant and Pb-free?
Yes, the 93LC56AT/SN is Pb-free and RoHS compliant per Microchip DS21794G documentation. Its SOIC-8 (SN) package uses Matte Tin (Sn) finish, meeting JEDEC J-STD-609A standards. Full compliance documentation is available through Microchip's official product page and Aetrix Electronics' material declarations.
93LC56AT/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:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- 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
93LC56AT/SN FAQ
1.How can I place an order for 93LC56AT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT/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 93LC56AT/SN reliable?
The price and inventory of 93LC56AT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56AT/SN is usually 5 days.
3.What payment methods are accepted for 93LC56AT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT/SN?
93LC56AT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT/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 93LC56AT/SN?
For technical support, including 93LC56AT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT/SN requirements.
6.How does Aetrix verify that 93LC56AT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56AT/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 93LC56AT/SN meets industry standards.
7.What is the process for return or replacement of 93LC56AT/SN?
All 93LC56AT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT/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 93LC56AT/SN part is unused and in its original packaging.
Return procedure for 93LC56AT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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