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Microchip Technology 93LC56AX-I/SN
- Part No.:
- 93LC56AX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56AX-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,850
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Product details
Overview
93LC56AX-I/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, rated for Industrial temperature range (–40°C to +85°C), and housed in an 8-lead SOIC package (SN). It delivers 1 million erase/write cycles and >200 years data retention for nonvolatile parameter storage in embedded control systems.
For engineers reviewing the 93LC56AX-I/SN datasheet, 93LC56AX-I/SN pinout, 93LC56AX-I/SN application, or 93LC56AX-I/SN equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), self-timed write/erase with Ready/Busy status on DO, power-on/off data protection, and compatibility with microcontroller SPI-like serial masters requiring minimal I/O resources.
Technical Context
This device implements a synchronous serial Microwire protocol with CS, CLK, DI, and DO signals. It uses internal auto-erase before write and supports ERAL (Erase All) and WRAL (Write All) commands - both requiring VCC ≥4.5 V. The absence of an ORG pin confirms fixed 8-bit word organization and eliminates external configuration logic.
Power management includes automatic entry into Standby mode when CS is low, with ICCS ≤5 µA (I-temp) and built-in VCC voltage detection (VPOR = 1.5 V typical) to inhibit operations during brown-out. Read and write timing is fully specified across voltage and temperature ranges, with TWC = 6 ms for erase/write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit); provides compact, byte-addressable nonvolatile storage for calibration data, device IDs, or configuration registers. |
| VCC range | 2.5 V to 5.5 V; supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles; enables robust field-updatable firmware parameters in industrial controllers. |
| Data retention | >200 years at +25°C; ensures long-term reliability for unattended equipment and legacy system maintenance. |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI/DO); reduces MCU pin count and simplifies PCB routing versus I²C or parallel EEPROMs. |
| Access time | TPD ≤200 ns (VCC ≥4.5 V); supports high-speed read bursts in real-time control loops. |
| Operating temp | –40°C to +85°C (Industrial grade); qualified for deployment in factory automation, HVAC, and metering environments. |
Pinout & Package
8-lead SOIC (SN) package with standard 150-mil body width and Pb-free Matte Tin finish. Pin 1 marked by notch or laser dot; pin 1 corner located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions; controls Standby entry and Ready/Busy polling window. |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; clock can be paused mid-sequence without corruption. |
| DI | Data Input | Receives Start bit, opcodes, addresses, and write data; shares no internal path with DO (separate pins). |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during write cycle unless polled. |
| VSS | Ground | Reference return for all digital and power circuits; requires low-impedance connection to minimize noise coupling. |
| NC | No Connection | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice - no functional impact. |
| VCC | Power Supply | Supplies core logic and memory array; VPOR threshold (1.5 V) prevents spurious writes during power ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components and software delays - TWC = 6 ms guaranteed, freeing MCU resources for other tasks. |
| Ready/Busy status on DO | Enables efficient polling-based write completion detection without interrupt lines or fixed delay loops. |
| Power-on/off data protection | Hardware-level VCC monitoring blocks all write/erase commands below VPOR (1.5 V), preventing corruption during brown-out or hot-plug events. |
| Automatic ERAL before WRAL | WRAL command internally executes full-array erase prior to programming, ensuring deterministic initialization without separate ERAL instruction. |
| 100% tested DC/AC specs | All electrical characteristics (e.g., VIH/VIL, TCKH/TCKL, TPD) are production-tested - not sampled - ensuring consistent timing margin across units. |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff tables, meter calibration coefficients, and tamper-event logs across power cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed via MCU's GPIO-banged Microwire interface during initialization and periodic updates. Use Value: 256 × 8-bit capacity matches common meter configuration block sizes; >200-year retention avoids field recalibration; 1M endurance supports daily log writes for 27+ years. | Use Scenario: Holding module identification, channel scaling factors, and diagnostic history in distributed I/O nodes. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM interfaced to ARM Cortex-M MCU over 3-wire bus with CS-driven Ready/Busy polling. Use Value: Fixed 8-bit organization simplifies firmware driver development; VCC=2.5–5.5 V range aligns with 3.3 V PLC backplane supplies; Industrial temp rating ensures operation inside metal enclosures. |
| Medical Infusion Pumps | Automotive Body Control Modules |
Use Scenario: Storing drug library profiles, dose limits, and usage audit trails compliant with IEC 62304. IC Role / Device Role / Timing Role: Safety-critical configuration store accessed only during boot and authorized service mode; protected by EWEN/EWDS sequence. Use Value: Power-on data protection prevents corruption during battery swap; 1M endurance exceeds FDA-required lifetime write cycles; RoHS/Pb-free compliance meets medical supply chain mandates. | Use Scenario: Retaining seat position memory, mirror presets, and lighting configuration across ignition cycles. IC Role / Device Role / Timing Role: Low-pin-count EEPROM integrated into BCM ASIC subsystem, sharing MCU's serial peripheral interface. Use Value: SOIC-8 (SN) footprint allows drop-in replacement in legacy designs; 2.5 V minimum VCC supports start-stop system brown-out conditions; sequential read enables fast profile loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-I/SN | 128 × 16-bit organization; same VCC range, package, and timing; requires 16-bit data framing. | Used where firmware stores wider configuration words (e.g., 16-bit ADC offsets) and MCU supports native 16-bit serial transfer. | Select only if application demands 16-bit word access and software stack handles dual-byte alignment. |
| AT25020B-MAU-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz max clock; no Ready/Busy pin - relies on WIP flag polling. | Preferred in designs already using SPI peripherals; lacks hardware status pin but offers faster clock rate. | Choose when migrating from legacy Microwire to SPI infrastructure or when higher throughput (>3×) justifies extra pin and driver complexity. |
Compared with 93LC56BT-I/SN, the 93LC56AX-I/SN provides simpler 8-bit data handling and eliminates ORG pin routing; compared with AT25020B-MAU-T, it offers deterministic Ready/Busy signaling without status register reads, reducing MCU overhead in resource-constrained systems.
Availability
93LC56AX-I/SN is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, and medical infusion pumps requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56AX-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, with global design and manufacturing operations.
The 93LC56A/B/C product line was designed specifically for cost-sensitive, low-power embedded systems requiring reliable serial nonvolatile storage with minimal MCU interface overhead and robust data integrity under voltage fluctuation.
FAQ
What is the memory organization of the 93LC56AX-I/SN?
The 93LC56AX-I/SN features a fixed 256 × 8-bit organization with no ORG pin - confirming dedicated 8-bit word access. This eliminates external configuration logic and simplifies firmware development versus ORG-enabled variants like the 93LC56C. All address and data transfers use 8-bit framing, and the device does not support 16-bit mode.
Does the 93LC56AX-I/SN support hardware write protection?
Yes, the 93LC56AX-I/SN implements hardware write protection via its Erase/Write Enable (EWEN) and Erase/Write Disable (EWDS) instruction sequence. The device powers up in EWDS mode, blocking all erase/write operations until EWEN is issued. After each write, executing EWDS restores protection - a critical feature for preventing accidental overwrites in deployed 93LC56AX-I/SN units.
What is the maximum clock frequency supported by the 93LC56AX-I/SN?
The 93LC56AX-I/SN supports a maximum clock frequency of 3 MHz when VCC is 4.5 V to 5.5 V, 2 MHz at 2.5 V to 4.5 V, and 1 MHz at 1.8 V to 2.5 V (though 93LC56A is not rated below 2.5 V). These AC specifications are production-tested and guarantee timing margins for reliable communication with MCUs across its full operating voltage range.
How is Ready/Busy status monitored on the 93LC56AX-I/SN?
Ready/Busy status is monitored on the DO pin: DO = low indicates ongoing erase/write, DO = high indicates completion. To poll, CS must be brought high for ≥250 ns after the instruction completes, then the DO state is sampled. After status read, issuing a Start bit followed by CS low clears the status latch - a required step before subsequent commands.
Is the 93LC56AX-I/SN compatible with SPI interfaces?
No, the 93LC56AX-I/SN uses a Microwire-compatible 3-wire interface (CS, CLK, DI/DO), not SPI. While functionally similar, it lacks SPI's dedicated MOSI/MISO lines and uses a single bidirectional data line with distinct opcode encoding. Direct SPI hardware cannot drive the 93LC56AX-I/SN without bit-banging or protocol translation - confirmed by Microchip's DS21794G specification.
93LC56AX-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
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56AX-I/SN FAQ
1.How can I place an order for 93LC56AX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AX-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 93LC56AX-I/SN reliable?
The price and inventory of 93LC56AX-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 93LC56AX-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC56AX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AX-I/SN?
93LC56AX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AX-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 93LC56AX-I/SN?
For technical support, including 93LC56AX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AX-I/SN requirements.
6.How does Aetrix verify that 93LC56AX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56AX-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 93LC56AX-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC56AX-I/SN?
All 93LC56AX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AX-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 93LC56AX-I/SN part is unused and in its original packaging.
Return procedure for 93LC56AX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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