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Microchip Technology 93LC56CT-I/MS
- Part No.:
- 93LC56CT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC56CT-I/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:637
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Product details
Overview
93LC56CT-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 Industrial temperature range (–40°C to +85°C), and housed in an 8-lead MSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, and power-on/off data protection - used for nonvolatile parameter storage in embedded controllers and sensor calibration modules.
For engineers reviewing the 93LC56CT-I/MS datasheet, 93LC56CT-I/MS pinout, 93LC56CT-I/MS application, or 93LC56CT-I/MS equivalent, key selection criteria include VCC range (2.5–5.5 V), 8-bit organization (no ORG pin), industrial temp rating, MSOP-8 package compatibility, and Microwire timing compliance per DS21794G.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO signals with start-bit detection and opcode-driven command execution. Memory is organized as 256 words × 8 bits; no ORG pin is present (confirmed for 'A' version), eliminating configuration dependency. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are executed via rising-edge clocked bit streams with defined clock frequency limits up to 3 MHz at VCC ≥ 4.5 V.
Internal logic includes power-on reset circuitry that inhibits operation below ~1.5 V, automatic erase-before-write, and Ready/Busy status output on DO during programming. The device powers up in EWDS mode, requiring explicit EWEN before any write/erase, and supports sequential read when CS remains high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit organization; fixed, no ORG pin) |
| VCC operating range | 2.5 V to 5.5 V - supports single-supply operation in 3.3 V and 5 V systems |
| Temperature grade | Industrial: –40°C to +85°C - qualified for industrial control and instrumentation |
| Interface protocol | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no SPI or I²C compatibility |
| Write endurance | 1,000,000 erase/write cycles - ensures long-term field reliability in frequent-update applications |
| Data retention | Greater than 200 years at +25°C - suitable for lifetime-critical configuration storage |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V; 2 MHz at 2.5 V ≤ VCC < 4.5 V - defines maximum command throughput |
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 corner located at top-left 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 |
| 2 (CLK) | Serial Clock | Synchronizes all bit transfers on rising edge; stoppable at any point without corruption |
| 3 (DI) | Data Input | Accepts start bit, opcodes, addresses, and write data; shares net with DO only with external series resistor |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; connects to exposed pad if used |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (ORG) | Organization Select | Not applicable - 93LC56A variant has no ORG function; pin is NC (no internal connection) |
| 8 (VCC) | Power Supply | Supplies core and interface logic; voltage detect threshold ~1.5 V prevents operation during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - TWC = 6 ms typical, fully autonomous |
| Automatic ERAL before WRAL | Guarantees clean memory state prior to full-array write - no separate ERAL command required |
| Power-on/off data protection | Hardware lockout below ~1.5 V VCC - prevents corruption during supply ramp-up/down |
| Ready/Busy status on DO | Enables polling-based firmware flow control without interrupt or timeout overhead |
| 1,000,000 endurance cycles | Supports daily reconfiguration over >27 years - validated at 25°C, 5.0 V |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed infrequently during startup or maintenance mode via Microwire interface. Use Value: Ensures measurement accuracy across temperature and lifetime without battery-backed RAM or external supervision. | Use Scenario: Holding user-defined I/O mapping, communication baud rates, and alarm thresholds in HVAC control panels. IC Role / Device Role / Timing Role: Configuration store updated only during setup or firmware upgrade; read at boot time. Use Value: Enables field customization without hardware change; retains settings through power loss and reset events. |
| Medical Device Settings Backup | Automotive Body Control Module |
Use Scenario: Preserving therapy parameters and usage logs in portable infusion pumps compliant with IEC 62304. IC Role / Device Role / Timing Role: Safety-critical data archive with deterministic write latency (6 ms max) and verified write completion via DO polling. Use Value: Meets data integrity requirements for Class II medical devices; supports audit trail and recall functionality. | Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: Low-power nonvolatile memory accessed over LIN or CAN gateway MCU's GPIO-controlled Microwire bus. Use Value: Operates reliably at 12 V system-derived 3.3 V rail; withstands automotive thermal cycling (-40°C to +85°C). |
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/temp/package; no ORG pin | Requires 16-bit data path and software handling of word-aligned addressing | Select only if system architecture mandates 16-bit word access and avoids byte-level granularity |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V, SOIC-8/MSOP-8; no ERAL/WRAL auto-erase | Needs SPI master support; lacks integrated erase-all-before-write; requires explicit erase step | Choose when migrating to SPI ecosystem or needing higher clock rate (20 MHz) and broader voltage range |
Compared with 93LC56B-I/MS, the 93LC56CT-I/MS provides native 8-bit addressing and simpler byte-oriented firmware; versus AT25020B-MAHL-T, it offers guaranteed erase-before-write and Microwire compatibility but lower max clock speed and no SPI flexibility.
Availability
93LC56CT-I/MS is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive subsystems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56CT-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 93LC56 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power, nonvolatile data storage in resource-constrained embedded systems with minimal pin count.
FAQ
What is the memory organization of the 93LC56CT-I/MS?
The 93LC56CT-I/MS is a fixed 256 × 8-bit (2 Kbit) organization device - designated as an 'A' version in the 93LC56 family. It does not include an ORG pin; therefore, it operates exclusively in x8 mode with no configuration option for x16. This simplifies PCB layout and firmware design by eliminating external logic for word-size selection.
Does the 93LC56CT-I/MS require an external pull-up resistor on the DO pin?
No, the 93LC56CT-I/MS does not require an external pull-up on DO. The DO pin actively drives high or low during READ or Ready/Busy status reporting and enters High-Z when inactive. However, if DI and DO are shorted on a shared bus, a series resistor (~1 kΩ) is recommended to prevent bus conflict during the dummy zero phase of READ operations.
What is the maximum clock frequency supported by the 93LC56CT-I/MS at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC56CT-I/MS supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1, condition "2.5 V ≤ VCC < 4.5 V"). Exceeding this violates AC timing and may cause command misinterpretation or incomplete writes.
How is write protection implemented on the 93LC56CT-I/MS?
Write protection on the 93LC56CT-I/MS uses dual hardware/software mechanisms: (1) Power-on reset disables writes below ~1.5 V VCC, and (2) the device powers up in Erase/Write Disable (EWDS) mode - requiring an explicit EWEN instruction before any ERASE or WRITE. An EWDS command should follow each write to re-enable protection.
Is the 93LC56CT-I/MS compatible with standard SPI interfaces?
No, the 93LC56CT-I/MS is not SPI-compatible. It uses a proprietary Microwire-compatible 3-wire interface (CS, CLK, DI/DO) with start-bit detection and specific opcode encoding (e.g., 10b for READ). It lacks MOSI/MISO separation and SPI mode signaling, requiring dedicated Microwire firmware drivers - not generic SPI peripherals.
93LC56CT-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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
93LC56CT-I/MS FAQ
1.How can I place an order for 93LC56CT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56CT-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 93LC56CT-I/MS reliable?
The price and inventory of 93LC56CT-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 93LC56CT-I/MS is usually 5 days.
3.What payment methods are accepted for 93LC56CT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56CT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56CT-I/MS?
93LC56CT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56CT-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 93LC56CT-I/MS?
For technical support, including 93LC56CT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56CT-I/MS requirements.
6.How does Aetrix verify that 93LC56CT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93LC56CT-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 93LC56CT-I/MS meets industry standards.
7.What is the process for return or replacement of 93LC56CT-I/MS?
All 93LC56CT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56CT-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 93LC56CT-I/MS part is unused and in its original packaging.
Return procedure for 93LC56CT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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