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Microchip Technology 93LC56CT-I/ST
- Part No.:
- 93LC56CT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56CT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,301
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Product details
Overview
93LC56CT-I/ST 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 TSSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status signaling via DO pin - used in microcontroller-based system configuration storage and calibration data retention.
For engineers reviewing the 93LC56CT-I/ST datasheet, 93LC56CT-I/ST pinout, 93LC56CT-I/ST application, or 93LC56CT-I/ST equivalent, key selection criteria include VCC range (2.5–5.5 V), 8-bit organization (no ORG pin), TSSOP-8 package compatibility, 1 million endurance cycles, and 200-year data retention - critical for industrial control firmware parameter storage and power-loss-resilient settings backup.
Technical Context
The 93LC56CT-I/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal logic enforces power-on data protection and requires explicit EWEN before programming, with all operations synchronized to rising CLK edges.
It uses a fixed 256 × 8-bit memory array ('A' version), eliminating ORG pin dependency - unlike 'C' variants - and relies on CS-controlled active-low chip select with minimum 250 ns CS low time between commands. Ready/Busy status is polled via DO pin after CS high assertion following TCSL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - provides compact nonvolatile storage for boot parameters or sensor calibration coefficients |
| VCC operating 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 - ensures long-term reliability in field-updatable systems |
| Data retention | Greater than 200 years at 25°C - guarantees data integrity across product lifecycle without refresh |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI/DO) - minimal GPIO usage, compatible with legacy MCU peripheral drivers |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - enables fast bulk reads during system initialization |
| Temperature grade | Industrial (–40°C to +85°C) - qualified for use in factory automation, HVAC, and embedded instrumentation |
Pinout & Package
8-lead TSSOP (ST) package with exposed pad option; pin 1 marked by laser dot; RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held high ≥250 ns between commands; initiates instruction execution on rising edge |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; opcodes, addresses, and data latched on rising edge |
| 3 (DI) | Data Input | Accepts Start bit, instruction opcodes, address bits, and write data; high impedance when not selected |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance connection |
| 6 (NC) | No Connection | Internally unconnected; no external tie required; may be left floating or grounded per layout best practice |
| 7 (ORG) | Organization Select | Not implemented on 93LC56A variants - permanently tied off; pin is NC and unused |
| 8 (VCC) | Power Supply | Supplies core and I/O circuitry; requires local 0.1 µF bypass capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control - simplifies firmware and reduces CPU overhead during nonvolatile writes |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write - prevents partial-write corruption in power-interrupted scenarios |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC threshold - prevents inadvertent writes during brown-out conditions |
| Ready/Busy status signaling | Enables polling-based operation without fixed delays - improves system responsiveness and deterministic timing |
| Sequential read function | Allows continuous address incrementing with single CS assertion - accelerates firmware parameter table reads |
Applications
| Industrial Sensor Calibration Storage | Microcontroller Boot Configuration |
|---|---|
Use Scenario: Storing factory-trimmed gain/offset coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during power-up initialization sequence. Use Value: Enables plug-and-play sensor replacement without host reprogramming; retains values across 200+ years and 1M cycles. | Use Scenario: Holding bootloader configuration flags (e.g., UART baud rate, debug enable, fail-safe mode) in embedded motor drives. IC Role / Device Role / Timing Role: Early-boot configuration store read before main application starts. Use Value: Supports field-upgradable firmware behavior without modifying flash code; immune to reset-induced corruption. |
| Power Meter Firmware Settings | Medical Device Calibration Data |
Use Scenario: Retaining tariff tables, CT/PT ratios, and communication protocol settings in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, low-power configuration vault updated infrequently but requiring guaranteed retention. Use Value: Meets IEC 62056 requirements for data integrity over 10+ year meter lifetime; operates reliably at 2.5 V during battery backup. | Use Scenario: Storing patient-specific calibration constants (e.g., pressure transducer offsets) in portable infusion pumps. IC Role / Device Role / Timing Role: Safety-critical parameter archive accessed during device self-test at power-on. Use Value: Qualified to Industrial temp range and 200-year retention - satisfies ISO 13485 traceability and audit requirements. |
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/ST | 128 × 16-bit organization; same VCC range, package, and temp grade | Requires 16-bit MCU interface alignment; incompatible with existing 8-bit address/data firmware | Select only if system architecture mandates 16-bit word access and software can be modified accordingly |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, same endurance and retention | Requires different driver stack (SPI vs Microwire); pinout incompatible (SOIC-8, not TSSOP-8) | Choose when migrating to SPI-based platforms or when needing faster 20 MHz clock support |
Compared with 93LC56B-I/ST and AT25020B-SSHL-T, the 93LC56CT-I/ST offers native 8-bit Microwire compatibility in TSSOP-8 with guaranteed 2.5 V operation - making it optimal for space-constrained 3.3 V industrial controllers where pin count and legacy interface preservation are critical.
Availability
93LC56CT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration storage, microcontroller boot configuration, and power meter firmware settings requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for 93LC56CT-I/ST 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 93LC56 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power, nonvolatile memory applications in industrial, automotive, and consumer systems requiring proven reliability and long-term supply stability.
FAQ
What is the memory organization of the 93LC56CT-I/ST?
The 93LC56CT-I/ST is a fixed 256 × 8-bit (2 Kbit) device - designated as an 'A' version - meaning it has no functional ORG pin and always operates in 8-bit mode. This differs from 'C' variants that require external logic on ORG to select 8- or 16-bit configuration. The 93LC56CT-I/ST simplifies design by eliminating ORG routing and associated pull-up/pull-down components.
Does the 93LC56CT-I/ST require an Erase/Write Enable (EWEN) command before every write operation?
Yes, the 93LC56CT-I/ST powers up in Erase/Write Disable (EWDS) mode. An EWEN instruction must be issued before any ERASE or WRITE command can execute. After successful programming, best practice is to issue EWDS to prevent accidental writes - a hardware-level safeguard independent of MCU firmware state. This behavior is confirmed in DS21794G Section 2.6.
Can the 93LC56CT-I/ST operate at 2.5 V while maintaining full timing specifications?
Yes, the 93LC56CT-I/ST is fully specified down to 2.5 V across its Industrial temperature range (–40°C to +85°C). At 2.5 V, maximum clock frequency is 2 MHz (per Table 1-2, A1), and write cycle time increases to 6 ms (Table 1-2, A12). All DC and AC parameters in DS21794G-page 3–4 are validated at VCC = 2.5 V, ensuring reliable operation in battery-backed or low-voltage embedded systems.
Is the ORG pin functional on the 93LC56CT-I/ST?
No, the ORG pin is not functional on the 93LC56CT-I/ST. As an 'A' version device, it implements a fixed 8-bit organization and the ORG pin is internally unconnected (NC). In the TSSOP-8 package, Pin 7 is labeled ORG/NC in the datasheet and must be left unconnected - tying it to VCC or VSS will not alter behavior and may risk unintended leakage paths.
What package type does the 93LC56CT-I/ST use, and what does the 'ST' suffix indicate?
The 'ST' suffix in 93LC56CT-I/ST denotes the 8-lead TSSOP (Thin Shrink Small Outline Package) variant, per Microchip's standard package coding. It measures 4.4 mm × 3.0 mm × 1.2 mm, features gull-wing leads, and is RoHS-compliant with matte tin finish. The 'T' indicates tape-and-reel packaging, and 'I' specifies Industrial temperature grade - confirming full functionality from –40°C to +85°C.
93LC56CT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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-TSSOP
93LC56CT-I/ST FAQ
1.How can I place an order for 93LC56CT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56CT-I/ST 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/ST reliable?
The price and inventory of 93LC56CT-I/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 93LC56CT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56CT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56CT-I/ST?
93LC56CT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56CT-I/ST 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/ST?
For technical support, including 93LC56CT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56CT-I/ST requirements.
6.How does Aetrix verify that 93LC56CT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56CT-I/ST 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/ST meets industry standards.
7.What is the process for return or replacement of 93LC56CT-I/ST?
All 93LC56CT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56CT-I/ST, 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/ST part is unused and in its original packaging.
Return procedure for 93LC56CT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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