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Microchip Technology 93LC56AXT/SN
- Part No.:
- 93LC56AXT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56AXT/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
93LC56AXT/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 signaling via DO pin. Used for configuration storage in microcontroller-based embedded systems requiring nonvolatile parameter retention.
For engineers reviewing the 93LC56AXT/SN datasheet, 93LC56AXT/SN pinout, 93LC56AXT/SN application, or 93LC56AXT/SN equivalent, key selection criteria include its 8-bit fixed organization (no ORG pin), SOIC-8 package compatibility, 1 million erase/write endurance, >200-year data retention, and support for sequential read and power-on/off data protection.
Technical Context
The 93LC56AXT/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO signals. Its internal architecture includes an address decoder, data register, and mode decode logic enabling instruction-based operations including READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS - all initiated by rising-edge clocked opcodes and addresses.
It operates exclusively in x8-bit organization (no ORG pin), uses a self-timed write cycle of 6 ms (typical), and provides Ready/Busy status polling via DO pin after minimum TCSL (250 ns). Power-on reset circuitry inhibits operation below 1.5 V, and EWEN/EWDS commands enforce explicit write-enable control to prevent accidental programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin required or functional |
| VCC range | 2.5 V to 5.5 V - supports wide-range industrial supply rails; POR threshold at 1.5 V |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V; enables long-term field calibration storage |
| Data retention | >200 years - ensures firmware/config integrity across product lifecycle without refresh |
| Write cycle time | 6 ms (typical) - self-timed; eliminates need for external timing control during programming |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage; compatible with legacy MCU peripherals |
| Temp range | –40°C to +85°C (Industrial) - qualified for industrial control, metering, and automotive body electronics |
Pinout & Package
93LC56AXT/SN is supplied in 8-lead SOIC (SN) package per JEDEC MS-012, with standard pinout and Pb-free Matte Tin finish. Pin 1 is CS (Chip Select), Pin 2 is CLK (Serial Clock), Pin 3 is DI (Data In), Pin 4 is DO (Data Out), Pin 5 is VSS (Ground), Pin 6 is NC (No internal connection), Pin 7 is NC (No internal connection), and Pin 8 is VCC (Power Supply).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion |
| CLK (Pin 2) | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; stoppable at any level; ignored when CS is low |
| DI (Pin 3) | Data Input | Accepts Start bit, opcodes, addresses, and write data; requires stable setup/hold relative to CLK |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z on CS falling edge |
| VSS (Pin 5) | Ground | Reference return path for all I/O and internal logic; must be low-impedance |
| NC (Pin 6) | No internal connection | Not bonded; must be left unconnected or tied to VSS/VCC only if required by PCB layout constraints |
| NC (Pin 7) | No internal connection | Not bonded; electrically isolated; no routing or termination required |
| VCC (Pin 8) | Power Supply | Supplies core and I/O circuitry; decoupling capacitor (0.1 µF) recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry; 6 ms typical cycle reduces firmware overhead and simplifies host driver design |
| Automatic ERAL before WRAL | Guarantees full array readiness prior to bulk write; prevents partial-write corruption without software intervention |
| Power-on/off data protection | Hardware-level lockout below 1.5 V VCC; prevents spurious writes during brown-out or power ramp-up/down |
| Ready/Busy status via DO | Enables efficient polling instead of fixed delays; improves system responsiveness and reduces CPU wait cycles |
| Sequential read mode | Allows continuous address increment with single CS assertion; cuts transaction overhead by ~40% vs. random reads |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing calibrated sensor offsets, tariff tables, and firmware revision metadata in electricity/water/gas meters operating across wide temperature ranges. IC Role / Device Role / Timing Role: Nonvolatile configuration EEPROM interfaced to an 8-bit MCU via Microwire; retains data through 10+ year deployments and repeated power cycles. Use Value: 1M endurance and >200-year retention ensure calibration integrity over entire meter lifetime without field recalibration or battery backup. | Use Scenario: Holding user-defined I/O mapping, PID loop parameters, and alarm thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Serial configuration memory accessed during boot and runtime reconfiguration; supports hot-swap parameter updates without controller reset. Use Value: Self-timed 6 ms writes and Ready/Busy polling allow deterministic update latency, critical for real-time control loop stability. |
| Automotive Body Control Module (BCM) | Medical Device Setup Profile Storage |
Use Scenario: Saving seat/mirror/window position presets, lighting profiles, and diagnostic fault logs in automotive BCMs operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Microwire EEPROM directly connected to automotive-grade MCU; withstands load-dump transients and ESD per AEC-Q100 stress requirements. Use Value: Industrial temp grade and 2.5–5.5 V operation ensure reliable function across battery voltage fluctuations (e.g., cold crank at 6 V, alternator ripple at 14.5 V). | Use Scenario: Storing patient-specific therapy settings, calibration coefficients, and usage history in portable infusion pumps and diagnostic handhelds. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory storing FDA-required audit trails and safety-critical configuration data. Use Value: Hardware write-protection (EWEN/EWDS) and power-fail safe operation prevent unauthorized or corrupted writes during clinical use or battery replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BXT/SN | 128 × 16-bit organization; same VCC range, package, and timing; no ORG pin - fixed x16 mode | Requires 16-bit MCU interface or byte-swapped software handling; not drop-in for x8 systems | Select only if host system natively supports 16-bit serial transfers and memory map aligns to word boundaries |
| AT25020B-MAU-T | 2 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock; no ERAL/WRAL; different command set and status reporting | Lacks auto-ERAL before WRAL and hardware EWEN/EWDS; requires SPI peripheral instead of Microwire | Choose when migrating to SPI-based platforms or when higher clock speed justifies interface redesign |
Compared with 93LC56BXT/SN and AT25020B-MAU-T, the 93LC56AXT/SN offers guaranteed x8-bit compatibility, integrated ERAL-before-WRAL automation, and dedicated Microwire timing - making it optimal for legacy 8-bit MCU designs where pin count, code footprint, and deterministic write behavior are prioritized.
Availability
93LC56AXT/SN is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56AXT/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 93LC56A series belongs to Microchip's legacy Microwire-compatible serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing simple, robust nonvolatile storage without complex protocol stacks.
FAQ
What is the memory organization of the 93LC56AXT/SN?
The 93LC56AXT/SN has a fixed 256 × 8-bit (2 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin and does not support x16 mode. All instructions, addresses, and data transfers operate strictly in 8-bit format - no configuration or external logic is needed to select word size. This simplifies firmware development and eliminates potential misconfiguration errors seen in ORG-pin devices.
Does the 93LC56AXT/SN require an external pull-up resistor on the DO pin?
No, the 93LC56AXT/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 when CS is low or during non-read operations. However, if DI and DO are wired together (shared bus), a current-limiting resistor (e.g., 10 kΩ) is recommended to prevent bus conflict during the dummy zero preceding read data - as specified in DS21794G Section 2.2.
What is the maximum clock frequency supported by the 93LC56AXT/SN at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC56AXT/SN supports a maximum clock frequency of 2 MHz, per Table 1-2 (A1). This is confirmed for industrial temperature range (–40°C to +85°C). Exceeding 2 MHz may result in setup/hold violations or unreliable opcode recognition, especially under worst-case voltage and temperature conditions.
How does the 93LC56AXT/SN handle power loss during a write operation?
The 93LC56AXT/SN incorporates hardware power-loss protection: its internal power-on reset circuitry disables all write functions when VCC drops below ~1.5 V (DS21794G Section 2.3). If a write is in progress and VCC falls below this threshold, the cycle aborts safely and leaves memory unchanged. No data corruption occurs, and the device resumes normal operation once VCC stabilizes above 1.5 V - ensuring robustness in brown-out scenarios.
Is the 93LC56AXT/SN pin-compatible with other 93XX56 variants in SOIC-8 package?
Yes, the 93LC56AXT/SN is pin-compatible with all 93XX56A/B/C variants in SOIC-8 (SN) package - including 93LC56BXT/SN and 93LC56CXT/SN - sharing identical pinout (CS/CLK/DI/DO/VSS/NC/NC/VCC). However, functional compatibility depends on organization: 'A' and 'B' variants have no ORG pin and fixed x8/x16 modes, while 'C' variants require ORG pin control. Swapping 'A' for 'C' without ORG wiring will cause undefined behavior.
93LC56AXT/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
- 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
93LC56AXT/SN FAQ
1.How can I place an order for 93LC56AXT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AXT/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 93LC56AXT/SN reliable?
The price and inventory of 93LC56AXT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56AXT/SN is usually 5 days.
3.What payment methods are accepted for 93LC56AXT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AXT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AXT/SN?
93LC56AXT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AXT/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 93LC56AXT/SN?
For technical support, including 93LC56AXT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AXT/SN requirements.
6.How does Aetrix verify that 93LC56AXT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56AXT/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 93LC56AXT/SN meets industry standards.
7.What is the process for return or replacement of 93LC56AXT/SN?
All 93LC56AXT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AXT/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 93LC56AXT/SN part is unused and in its original packaging.
Return procedure for 93LC56AXT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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