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Microchip Technology 93LC56AX-E/SN
- Part No.:
- 93LC56AX-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56AX-E/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,899
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Product details
Overview
93LC56AX-E/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 automotive-grade temperature operation (–40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in engine control units for calibration storage.
For engineers reviewing the 93LC56AX-E/SN datasheet, 93LC56AX-E/SN pinout, 93LC56AX-E/SN application, or 93LC56AX-E/SN equivalent, key selection criteria include its automotive temperature rating, 256 × 8-bit fixed organization (no ORG pin), SOIC-8 package, 1 million endurance cycles, and 200-year data retention - critical for safety-critical embedded memory in vehicle subsystems.
Technical Context
The 93LC56AX-E/SN implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO signals. It operates exclusively in x8 mode (ORG pin not present), requiring no external configuration logic. All instructions - READ (20 clocks), WRITE (20 clocks), ERASE (12 clocks), ERAL (12 clocks), WRAL (20 clocks) - are initiated by a Start bit followed by opcode and address bits clocked on rising CLK edges.
Internal power-on reset and voltage-detect circuitry (VPOR = 1.5 V typical) inhibit all operations below VCC threshold. The device powers up in EWDS (Erase/Write Disable) state; an explicit EWEN command is mandatory before any programming cycle. Ready/Busy status is polled via DO pin after CS reassertion with ≥250 ns low time (TCSL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit); fixed x8 organization - no ORG pin required, simplifying PCB layout and firmware initialization. |
| VCC range | 2.5 V to 5.5 V - supports direct connection to 3.3 V or 5 V microcontroller I/O rails without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - enables frequent recalibration updates in automotive ECUs over full vehicle lifetime. |
| Data retention | 200 years at +85°C - ensures long-term integrity of stored trim values, fault logs, and configuration parameters. |
| Write cycle time | 6 ms typical (TWC) - deterministic timing allows precise host software timeout management during programming. |
| Operating temp | –40°C to +125°C (Automotive E grade) - qualified for under-hood and transmission control module environments. |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI/DO) - minimal pin count reduces MCU GPIO usage and board routing complexity. |
Pinout & Package
93LC56AX-E/SN is packaged in 8-lead SOIC (SN), with Pb-free Matte Tin finish. Pin 1 is CS; pin 2 is CLK; pin 3 is DI; pin 4 is DO; pin 5 is VSS; pin 6 is NC (no internal connection); pin 7 is NC; pin 8 is VCC. ORG pin is absent - confirming fixed 8-bit organization per device family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between commands (TCSL) to reset internal state and avoid spurious instruction latching. |
| CLK (Pin 2) | Serial Clock | Rising-edge synchronized I/O; clock can be paused mid-transfer; no CLK required during self-timed write cycle. |
| DI (Pin 3) | Data Input | Receives Start bit, opcodes, addresses, and write data; tied high with CS and CLK to detect Start condition. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS goes low; requires CS reassertion to sample status. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling into sensitive EEPROM core. |
| NC (Pin 6 & 7) | No Connection | Unbonded die pads; must remain unconnected on PCB - no pull-up/down or routing permitted. |
| VCC (Pin 8) | Power Supply | Supplies core and I/O; internal POR circuit activates at ~1.5 V; must be ≥4.5 V for ERAL and WRAL execution. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (6 ms), reducing host MCU firmware overhead. |
| Automatic ERAL before WRAL | Guarantees full array erasure prior to bulk write - prevents partial-data corruption during firmware update sequences. |
| Power-on/off data protection | Hardware-enforced lockout below VPOR (1.5 V) prevents inadvertent writes during brown-out or power ramp conditions. |
| Ready/Busy status on DO | Enables efficient polling-based programming flow without fixed delay loops - improves system responsiveness and determinism. |
| EWEN/EWDS security protocol | Requires explicit enable before each write/erase, preventing accidental overwrites due to noise or software faults. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing real-time fuel trim tables, knock sensor adaptation values, and diagnostic trouble codes (DTCs) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during cold cranking (low-VCC transients) and thermal cycling. Use Value: 200-year data retention and 1M endurance ensure calibration stability over 15+ year vehicle service life without field recalls. | Use Scenario: Holding camera calibration offsets, radar beamforming coefficients, and sensor fusion configuration in lane-keeping assist modules. IC Role / Device Role / Timing Role: Secure, low-pin-count memory for safety-critical configuration data requiring AEC-Q100 compliance. Use Value: Automotive temperature grade (–40°C to +125°C) and hardware write-protection enable reliable operation in front-bumper-mounted ADAS ECUs. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Recording gear shift learning profiles, clutch wear compensation, and adaptive torque converter lock-up timing. IC Role / Device Role / Timing Role: High-reliability EEPROM interfaced directly to 3.3 V TCM microcontroller via Microwire bus. Use Value: 2.5–5.5 V VCC range accommodates wide input rail variation in 12 V automotive systems, eliminating need for dedicated LDO. | Use Scenario: Storing user preferences (seat position, mirror angle), lighting profiles, and door lock configuration across battery disconnect events. IC Role / Device Role / Timing Role: Low-power serial memory retaining settings during vehicle sleep mode (ICCS ≤ 5 µA). Use Value: Standby current spec (5 µA max at E-temp) minimizes parasitic drain on 12 V battery during extended parking periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-E/SN | 128 × 16-bit organization (x16), same VCC/temp range and package - requires firmware rework for address/data width handling. | Used where 16-bit word access reduces transaction count (e.g., CAN message buffers), but incompatible with existing 8-bit firmware. | Select only if system architecture mandates native 16-bit memory mapping and software can be updated accordingly. |
| AT25DF021-SSH-T | SPI interface (4-wire), 2 Mbit density, sector erase, faster clock (20 MHz), but no Ready/Busy pin - relies on software polling or status register reads. | Suitable for high-throughput logging or firmware patch storage, but lacks hardware status signaling and automotive qualification. | Prefer for non-safety applications needing higher density or speed; avoid where deterministic write status or AEC-Q100 compliance is required. |
Compared with 93LC56BT-E/SN, the 93LC56AX-E/SN offers simpler 8-bit firmware integration and identical automotive qualification; compared with AT25DF021-SSH-T, it provides hardware Ready/Busy signaling and guaranteed AEC-Q100 compliance at lower density and speed - making it optimal for cost-sensitive, safety-aware calibration storage.
Availability
93LC56AX-E/SN is available at Aetrix Electronics and suitable for engine control units, advanced driver assistance systems, and transmission control modules requiring stable component supply across multi-year automotive production programs.
Supply support for 93LC56AX-E/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, with global design and manufacturing operations.
The 93LCxx series was designed specifically for automotive and industrial applications requiring robust, low-power serial EEPROM with hardware write protection and extended temperature reliability - targeting ECU, TCM, and BCM subsystems.
FAQ
What is the memory organization of the 93LC56AX-E/SN?
The 93LC56AX-E/SN has a fixed 256 × 8-bit (2 Kbit) organization. It belongs to the 'A' version family, meaning the ORG pin is not implemented - eliminating configuration uncertainty and simplifying hardware design. This differs from 'C' versions that require external logic to set x8/x16 mode, and 'B' versions that are fixed x16. The absence of ORG confirms strict 8-bit data path compatibility.
Does the 93LC56AX-E/SN support hardware Ready/Busy signaling?
Yes, the 93LC56AX-E/SN provides hardware Ready/Busy status on the DO pin. After initiating an erase or write cycle, the host can reassert CS (with ≥250 ns low time) and read DO: low indicates ongoing operation, high indicates completion. This eliminates fixed-delay polling and improves system determinism - a key advantage over SPI EEPROMs requiring status register reads.
What is the minimum VCC required for ERAL and WRAL operations on the 93LC56AX-E/SN?
The 93LC56AX-E/SN requires VCC ≥ 4.5 V to execute ERAL (Erase All) and WRAL (Write All) commands. This is explicitly specified in the datasheet (DS21794G, pages 8 and 11). Below 4.5 V, these instructions will not initiate - ensuring data integrity during brown-out conditions. Standard READ, WRITE, and ERASE functions operate down to 2.5 V.
Is the 93LC56AX-E/SN qualified for automotive applications?
Yes, the 93LC56AX-E/SN carries the 'E' temperature grade suffix, certifying operation from –40°C to +125°C and compliance with automotive reliability requirements. Its packaging (SOIC-8 SN), Pb-free Matte Tin finish, and electrical specifications (e.g., VPOR = 1.5 V, ICCS ≤ 5 µA at E-temp) align with AEC-Q100 stress test expectations for non-safety-critical memory in ECUs and body modules.
How does the 93LC56AX-E/SN handle power loss during a write cycle?
The 93LC56AX-E/SN incorporates hardware power-loss protection: its internal voltage detector (VPOR ≈ 1.5 V) disables all write/erase operations when VCC drops below threshold. Combined with self-timed cycles and automatic ERAL before WRAL, this ensures no partial writes occur. Data remains intact post-power-loss, and the device resumes normal operation once VCC stabilizes above 2.5 V.
93LC56AX-E/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
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56AX-E/SN FAQ
1.How can I place an order for 93LC56AX-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AX-E/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 93LC56AX-E/SN reliable?
The price and inventory of 93LC56AX-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56AX-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC56AX-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AX-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AX-E/SN?
93LC56AX-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AX-E/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 93LC56AX-E/SN?
For technical support, including 93LC56AX-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AX-E/SN requirements.
6.How does Aetrix verify that 93LC56AX-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56AX-E/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 93LC56AX-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC56AX-E/SN?
All 93LC56AX-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AX-E/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 93LC56AX-E/SN part is unused and in its original packaging.
Return procedure for 93LC56AX-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56AX-E/SN Tags
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