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Microchip Technology 93LC56A-I/MS
- Part No.:
- 93LC56A-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC56A-I/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,266
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Product details
Overview
93LC56A-I/MS 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 -40°C to +85°C industrial temperature range, and housed in an 8-lead MSOP package. It delivers nonvolatile memory storage for microcontroller-based systems requiring reliable parameter retention in power-constrained embedded applications.
For engineers reviewing the 93LC56A-I/MS datasheet, 93LC56A-I/MS pinout, 93LC56A-I/MS application, or 93LC56A-I/MS equivalent, key selection criteria include its 8-bit fixed organization (no ORG pin), self-timed erase/write cycles (6 ms typical), 1 million endurance cycles, 200-year data retention, and Ready/Busy status signaling via DO pin during programming.
Technical Context
The 93LC56A-I/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin present, confirming fixed 256 × 8-bit memory mapping. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS) are initiated by a Start bit followed by opcode, address, and optional data on the rising edge of CLK.
Internal power-on reset and voltage-detect circuitry (VPOR = 1.5 V typical) disable write operations below VCC threshold, while automatic Erase-All-before-Write-All (ERAL before WRAL) and self-timed auto-erase ensure data integrity. Standby current is ≤5 µA at 2.5 V, supporting ultra-low-power system sleep modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin; eliminates external configuration logic. |
| VCC range | 2.5 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifters. |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration or logging updates in field-deployed devices. |
| Data retention | >200 years at 25°C - ensures long-term firmware parameter or calibration storage without refresh. |
| Write cycle time | 6 ms typical (TWC) - deterministic timing allows precise host software timeout management. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage; no SPI mode bits or complex protocol stack required. |
| Temp range | -40°C to +85°C (Industrial grade) - validated for operation in industrial control panels and automotive body electronics. |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot; pin 1 located at top-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; deselects device into standby (≤5 µA ICCS). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers on rising edge; clock can pause mid-sequence without corruption. |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; high-impedance when not selected. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status polling. |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; exposed pad (if used) must connect to PCB ground plane for thermal stability. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating - no tie to VSS/VCC or routing. |
| 7 (ORG) | Organization | Not applicable - 93LC56A variant has no functional ORG pin; pin is NC per datasheet Table 3-1. |
| 8 (VCC) | Power Supply | Supplies core and I/O; internal POR activates below 1.5 V to block writes during brown-out. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (6 ms); simplifies firmware driver design. |
| Ready/Busy status on DO | Enables real-time polling during programming - avoids fixed delays and improves system responsiveness. |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write; prevents partial-write corruption without host intervention. |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR (1.5 V); prevents data corruption during power ramp-up/down. |
| Industry-standard 3-wire interface | Direct compatibility with legacy Microwire peripherals and widely supported MCU hardware SPI modules in 3-wire mode. |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients and tariff tables that persist across power cycles and firmware updates. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed infrequently but with absolute write reliability; operates at 3.3 V alongside metrology SoC. Use Value: 1M endurance and >200-year retention ensure 20+ year field life without recalibration drift or data loss. | Use Scenario: Holding user-defined I/O mapping, PID loop parameters, and alarm thresholds in modular automation controllers. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM interfaced via GPIO-banged Microwire to reduce BOM cost vs. SPI flash. Use Value: 6 ms write time and Ready/Busy signaling allow deterministic state-machine control during parameter save sequences. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Settings |
Use Scenario: Retaining seat/mirror position presets, lighting profiles, and diagnostic fault logs in 12 V automotive systems with LDO-regulated 3.3 V rail. IC Role / Device Role / Timing Role: Industrial-temp (-40°C to +85°C) EEPROM co-located with MCU; withstands under-hood thermal cycling. Use Value: VCC brown-out protection (1.5 V VPOR) prevents corruption during engine cranking voltage sag. | Use Scenario: Securing drug library, dosage limits, and clinician-configurable safety interlocks in battery-powered portable infusion devices. IC Role / Device Role / Timing Role: Low-power (≤5 µA standby) nonvolatile memory enabling multi-week battery life in sleep mode. Use Value: MSOP package footprint (3.0 × 3.0 mm) fits tight PCB space constraints while supporting reflow 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-I/MS | 128 × 16-bit organization; same VCC range, temp grade, and package; requires 16-bit data framing. | Used where MCU data bus or firmware naturally handles 16-bit words; incompatible with 8-bit-only drivers. | Select only if system architecture mandates 16-bit word access and memory map alignment. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, same endurance and retention; no Ready/Busy pin - relies on WIP flag polling. | Requires SPI peripheral instead of GPIO-banged Microwire; lacks dedicated DO status signaling. | Choose when existing design uses SPI hardware and can tolerate flag-polling overhead instead of active status pin. |
Compared with 93LC56B-I/MS, the 93LC56A-I/MS provides native 8-bit compatibility without data-width conversion; compared with AT25020B-MAHL-T, it offers simpler 3-wire wiring and hardware-ready/busy signaling - critical for deterministic real-time parameter saves.
Availability
93LC56A-I/MS is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and medical device configuration storage requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56A-I/MS 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 93LC56A-I/MS belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems needing robust, low-power nonvolatile storage with minimal external components.
FAQ
What is the memory organization of the 93LC56A-I/MS?
The 93LC56A-I/MS features a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin - unlike 'C' variants, it does not support runtime word-size selection. This eliminates external configuration logic and guarantees consistent 8-bit data framing for all READ/WRITE operations, simplifying driver development and reducing PCB routing complexity.
Does the 93LC56A-I/MS require an external pull-up resistor on the DO pin?
No, the 93LC56A-I/MS does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when deselected (CS low) or idle. However, if DI and DO are shorted (shared bus), a series resistor (e.g., 10 kΩ) is recommended to prevent bus conflict during dummy-zero read phases.
What is the minimum VCC required for reliable operation of the 93LC56A-I/MS?
The 93LC56A-I/MS incorporates a built-in voltage detector (VPOR) with a typical threshold of 1.5 V. Below this level, all write operations are hardware-disabled to prevent data corruption during power-up or brown-out conditions. Reliable read/write functionality requires VCC ≥2.5 V, as specified in the DC Characteristics table for Industrial temperature range.
How does the Ready/Busy status work on the 93LC56A-I/MS DO pin?
During an erase or write cycle, the DO pin outputs Ready/Busy status: logic low indicates ongoing programming, logic high signals completion. To sample status, CS must be brought high for ≥250 ns after the initial command, then the DO level is sampled on the next CLK rising edge. After completion, issuing a Start bit followed by CS low clears the status latch.
Is the 93LC56A-I/MS pin-compatible with other packages in the 93XX56 family?
Yes - the 93LC56A-I/MS shares identical 8-pin MSOP pinout (CS/CLK/DI/DO/VSS/NC/ORG/VCC) with other 8-lead variants like SOIC (SN) and TSSOP (ST), per Package Types diagram on DS21794G-page 2. Pin functions and spacing match across these packages, enabling drop-in replacement in layout-constrained designs where footprint compatibility is verified.
93LC56A-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
93LC56A-I/MS FAQ
1.How can I place an order for 93LC56A-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56A-I/MS 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 93LC56A-I/MS reliable?
The price and inventory of 93LC56A-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56A-I/MS is usually 5 days.
3.What payment methods are accepted for 93LC56A-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56A-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56A-I/MS?
93LC56A-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56A-I/MS 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 93LC56A-I/MS?
For technical support, including 93LC56A-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56A-I/MS requirements.
6.How does Aetrix verify that 93LC56A-I/MS is sourced from the original manufacturer or authorized distributors?
All 93LC56A-I/MS 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 93LC56A-I/MS meets industry standards.
7.What is the process for return or replacement of 93LC56A-I/MS?
All 93LC56A-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56A-I/MS, 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 93LC56A-I/MS part is unused and in its original packaging.
Return procedure for 93LC56A-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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