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Microchip Technology 93C56CT-I/ST
- Part No.:
- 93C56CT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C56CT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,549
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Product details
Overview
The 93C56CT-I/ST from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating at 4.5–5.5 V, rated for industrial temperature (−40°C to +85°C), and housed in an 8-lead TSSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used for nonvolatile parameter storage in embedded control systems.
For engineers reviewing the 93C56CT-I/ST datasheet, 93C56CT-I/ST pinout, 93C56CT-I/ST application, or 93C56CT-I/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), TSSOP-8 package compatibility, 4.5–5.5 V supply requirement, industrial-grade temperature rating, and Microwire protocol timing compliance per DS21794G.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It uses a dedicated 8-bit memory organization ('A' variant), eliminating ORG pin dependency and simplifying host interface logic. Internal power-on reset and voltage-detect circuitry (VPOR = 3.8 V) inhibit write operations below VCC threshold.
Write operations are self-timed with 2 ms typical cycle time (TWC), supported by Ready/Busy status polling via DO pin. The architecture includes automatic erase-before-write, ERAL/WRAL commands, and EWEN/EWDS lockout controls - all executed without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin required |
| VCC range | 4.5 V to 5.5 V - requires stable regulated supply; write inhibited below 3.8 V |
| Endurance | 1,000,000 erase/write cycles - supports long-term field calibration storage |
| Data retention | 200 years at 25°C - suitable for lifetime firmware parameter backup |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage on microcontrollers |
| Write cycle time | 2 ms max (TWC) - enables deterministic firmware update latency |
| Temp range | −40°C to +85°C (Industrial) - validated for industrial control and automotive body electronics |
Pinout & Package
Package: 8-lead TSSOP (ST), 3.0 mm × 4.4 mm, 0.65 mm pitch, Pb-free Matte Tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates standby when low |
| 2 CLK | Serial Clock | Positive-edge synchronized I/O; clocking stops during self-timed write; TCKH/TCKL defined per VCC |
| 3 DI | Data Input | Accepts Start bit, opcode, address, and data; high-impedance when not selected |
| 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; decoupling capacitor required near pin |
| 6 NC | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 ORG | Organization Select | Not applicable - 93C56A variant has no functional ORG pin; marked NC in datasheet |
| 8 VCC | Power Supply | 4.5–5.5 V input; VPOR = 3.8 V ensures data integrity during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control; 2 ms max cycle time enables predictable firmware updates |
| Power-on/off data protection | Hardware-level VPOR circuitry blocks writes below 3.8 V, preventing corruption during power ramp |
| Ready/Busy status on DO | Enables polling-based host synchronization without interrupt or timer overhead |
| Automatic ERAL before WRAL | Guarantees full array erase prior to bulk write, removing software sequencing burden |
| EWEN/EWDS security lock | Prevents accidental writes via explicit enable/disable commands - critical for field-deployed devices |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in HVAC or pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes and long-term retention. Use Value: 200-year data retention and 1M endurance ensure calibration remains valid over product lifetime without refresh. | Use Scenario: Saving user-configurable settings (mirror position, seat memory) in vehicle body controllers. IC Role / Device Role / Timing Role: Low-pin-count serial EEPROM interfaced to 8-bit MCU via Microwire. Use Value: TSSOP-8 footprint and 4.5–5.5 V operation match automotive 5 V rail constraints and space-limited PCB layouts. |
| Medical Diagnostic Equipment | Smart Energy Metering |
Use Scenario: Retaining diagnostic fault logs and calibration history in portable ultrasound units. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration storage with hardware write protection. Use Value: EWEN/EWDS lockout and VPOR-based brown-out protection prevent unintended writes during power transitions. | Use Scenario: Storing tariff tables, billing counters, and meter ID in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Industrial-grade EEPROM supporting extended temperature operation and regulatory compliance. Use Value: −40°C to +85°C rating and RoHS/Pb-free construction meet utility-grade environmental and sustainability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C56CT-I/SN | Same 2 Kbit x8 EEPROM, identical electrical specs, but in SOIC-8 (5.3 mm × 4.4 mm) instead of TSSOP-8 (4.4 mm × 3.0 mm) | SOIC offers easier hand-soldering and higher thermal mass; TSSOP saves board area | Select SN for prototyping or legacy board compatibility; ST for space-constrained production designs |
| AT25020B-SSHL-T | 2 Kbit SPI EEPROM (not Microwire), 1.8–5.5 V supply, 20 MHz max clock, different command set and timing | Requires SPI interface and firmware adaptation; lacks ERAL/WRAL auto-erase and ORG flexibility | Choose only if migrating to SPI ecosystem; not drop-in compatible with 93C56CT-I/ST Microwire timing or instruction set |
Compared with 93C56CT-I/SN and AT25020B-SSHL-T, the 93C56CT-I/ST provides Microwire-native timing, guaranteed 2 ms write cycles, and industrial temperature validation in a compact TSSOP package - making it optimal for cost-sensitive, space-constrained embedded systems requiring proven legacy interface compatibility.
Availability
The 93C56CT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and medical diagnostic equipment requiring stable component supply across long product lifecycles.
Supply support for 93C56CT-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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93C56CT-I/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for reliable, low-power nonvolatile storage in resource-constrained embedded systems using Microwire-compatible interfaces.
FAQ
What is the memory organization of the 93C56CT-I/ST?
The 93C56CT-I/ST is a fixed 256 × 8-bit (2 Kbit) organization device - designated as an 'A' variant in Microchip's 93C56 family. It does not use the ORG pin; that pin is internally disconnected (NC) and must be left floating or tied to VSS per layout guidelines. This eliminates configuration complexity versus 'C' variants.
Does the 93C56CT-I/ST support 16-bit word access?
No, the 93C56CT-I/ST does not support 16-bit word access. As a 93C56A-series part, it is strictly 8-bit organized. Only 93C56B (128 × 16-bit) and 93C56C (selectable via ORG pin) variants provide 16-bit capability. Attempting 16-bit reads/writes on the 93C56CT-I/ST will result in incorrect data due to mismatched addressing and opcode interpretation.
What is the minimum VCC required to enable write operations on the 93C56CT-I/ST?
The 93C56CT-I/ST requires VCC ≥ 4.5 V for guaranteed operation, and its internal voltage detector (VPOR) inhibits all write functions below 3.8 V. Therefore, write operations are only permitted within the specified 4.5–5.5 V range. Operating below 4.5 V may cause unpredictable behavior or incomplete programming, even if above 3.8 V.
Can the 93C56CT-I/ST be used in automotive applications requiring AEC-Q200 qualification?
No, the 93C56CT-I/ST is rated for Industrial temperature (−40°C to +85°C) only and is not AEC-Q200 qualified. For automotive applications, Microchip offers the 93C56CT-E/ST variant ('E' grade), which is tested to −40°C to +125°C and meets AEC-Q200 stress requirements. The 'I' suffix explicitly denotes industrial, not automotive, qualification.
How is Ready/Busy status monitored on the 93C56CT-I/ST during a write cycle?
During a write cycle, the DO pin of the 93C56CT-I/ST outputs Ready/Busy status: logic low indicates ongoing programming, and logic high indicates completion. To sample this, CS must be brought high for ≥250 ns after the write command (TCSL), then the DO level read on the next CLK rising edge. After completion, issuing a Start bit followed by CS low clears the status flag.
93C56CT-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:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93C56CT-I/ST FAQ
1.How can I place an order for 93C56CT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56CT-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 93C56CT-I/ST reliable?
The price and inventory of 93C56CT-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 93C56CT-I/ST is usually 5 days.
3.What payment methods are accepted for 93C56CT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56CT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56CT-I/ST?
93C56CT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56CT-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 93C56CT-I/ST?
For technical support, including 93C56CT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56CT-I/ST requirements.
6.How does Aetrix verify that 93C56CT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93C56CT-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 93C56CT-I/ST meets industry standards.
7.What is the process for return or replacement of 93C56CT-I/ST?
All 93C56CT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C56CT-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 93C56CT-I/ST part is unused and in its original packaging.
Return procedure for 93C56CT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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