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Microchip Technology 93C56BT-I/ST
- Part No.:
- 93C56BT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C56BT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,925
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Product details
Overview
93C56BT-I/ST from Microchip Technology is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status via DO pin. Used in embedded system configuration storage where nonvolatile parameter retention and simple serial interface are required.
For engineers reviewing the 93C56BT-I/ST datasheet, 93C56BT-I/ST pinout, 93C56BT-I/ST application, or 93C56BT-I/ST equivalent, this page delivers verified electrical specs, package mapping to 8-lead TSSOP (ST), functional timing behavior, real-world use scenarios, and two confirmed alternative parts for design flexibility.
Technical Context
The 93C56BT-I/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (fixed 8-bit organization). It uses internal auto-erase prior to write, supports ERAL and WRAL commands, and enforces EWEN/EWDS protocol for write protection. Power-on reset circuitry disables writes below 3.8 V.
Timing is defined by strict AC parameters: max 3 MHz clock frequency at 4.5–5.5 V, 200 ns TPD, 2 ms TWC (write cycle), and 15 ms TWL (Write All). Data retention exceeds 200 years; endurance is rated at 1 million erase/write cycles at 25°C and VCC = 5.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin; supports byte-level addressing. |
| VCC range | 4.5 V to 5.5 V - operation disabled below 3.8 V (VPOR threshold); not compatible with 3.3 V or 2.5 V systems. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no I²C or SPI protocol; requires master-controlled start condition and opcode decoding. |
| Write cycle time | 2 ms (TWC) - self-timed; initiated by rising edge of CLK on last data bit; no external delay needed. |
| Data retention | >200 years - guaranteed under industrial temperature conditions; enables long-life field deployment without refresh. |
| Endurance | 1,000,000 erase/write cycles - specified at 25°C and VCC = 5.0 V; derates at higher temperature or voltage stress. |
| Temperature grade | Industrial (I): –40°C to +85°C - validated across full range; automotive (E) variant exists but not this part number. |
Pinout & Package
Package: 8-lead TSSOP (ST), Pb-free Matte Tin finish, body size 4.4 mm × 3.0 mm × 1.2 mm, pitch 0.65 mm. Pin 1 marked by laser dot; pin 1 is CS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates standby when low during active cycle. |
| 2 (CLK) | Serial Clock | Positive-edge synchronized; controls all data/opcode input and output timing; stoppable mid-sequence. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write 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; requires CS high ≥250 ns to sample status. |
| 5 (VSS) | Ground | Reference return path for all signals; must be low-impedance connection to minimize noise coupling. |
| 6 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice; not usable as strap or control. |
| 7 (ORG) | Organization Select | Not present on 93C56B/T variants - pin is NC; only applies to 'C' versions (e.g., 93C56C); irrelevant for this part. |
| 8 (VCC) | Power Supply | 4.5–5.5 V nominal; internal POR circuit blocks writes below 3.8 V; decoupling capacitor (0.1 µF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond Ready/Busy check; reduces firmware overhead. |
| Automatic ERAL before WRAL | Ensures full array is erased before bulk write; prevents partial-write corruption; requires no separate ERAL command. |
| Power-on/off data protection | Hardware-enforced write inhibition below 3.8 V; prevents inadvertent writes during brown-out or power ramp-up. |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delays; allows concurrent host processing while device programs internally. |
| Sequential read mode | Enables continuous address increment with CS held high; reduces instruction overhead for block reads (e.g., config tables). |
Applications
| Industrial Sensor Calibration Storage | Printer Firmware Parameter Retention |
|---|---|
|
Use Scenario: Storing calibrated offset/gain coefficients for analog sensor front-ends in factory-calibrated industrial transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding factory-trimmed values; accessed once at power-up; infrequent writes during recalibration. Use Value: 200-year data retention ensures calibration remains valid over product lifetime; 1M endurance supports periodic field recalibration. |
Use Scenario: Holding printer-specific settings (paper type defaults, nozzle alignment maps, ink level history) across power cycles. IC Role / Device Role / Timing Role: Serial configuration store interfaced to MCU via GPIO-banged Microwire; written during maintenance mode. Use Value: 2 ms write cycle enables fast parameter updates; 4.5–5.5 V compatibility matches legacy 5 V printer logic rails. |
| POS Terminal Configuration Memory | Legacy Automotive ECU Trim Storage |
|
Use Scenario: Saving merchant-specific tax rates, receipt formatting rules, and peripheral enable flags in point-of-sale terminals. IC Role / Device Role / Timing Role: Low-pin-count EEPROM for space-constrained mainboard; accessed via minimal 3-wire GPIO interface. Use Value: TSSOP-8 (ST) footprint minimizes PCB area; no ORG pin simplifies routing and eliminates configuration ambiguity. |
Use Scenario: Storing engine trim values (fuel map offsets, idle air control adjustments) in legacy automotive ECUs using 5 V logic. IC Role / Device Role / Timing Role: Industrial-grade nonvolatile memory qualified for –40°C to +85°C ambient; withstands under-hood thermal cycling. Use Value: VPOR = 3.8 V prevents corruption during cranking-induced voltage sag; 1M endurance supports dealer reprogramming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C56B-I/ST | Same 256 × 8-bit organization, 4.5–5.5 V, TSSOP-8; differs only in marking (B vs BT) - BT denotes tape-and-reel packaging per Microchip ID system. | No functional difference; identical timing, pinout, and spec compliance; suitable for same designs. | Select 93C56B-I/ST if standard reel packaging is preferred; 93C56BT-I/ST is functionally identical with optimized logistics handling. |
| 93LC56B-I/ST | 2.5–5.5 V supply range; includes ORG pin (NC on this variant); otherwise identical 256 × 8-bit structure and Microwire interface. | Supports 3.3 V systems; wider VCC range increases flexibility in mixed-voltage designs but adds unused ORG pin. | Choose 93LC56B-I/ST only if 3.3 V operation is required; otherwise 93C56BT-I/ST offers tighter VCC tolerance and simpler BOM. |
Compared with 93C56B-I/ST, the 93C56BT-I/ST offers identical functionality with tape-and-reel optimization; versus 93LC56B-I/ST, it trades 3.3 V compatibility for stricter 4.5–5.5 V regulation and elimination of ORG pin routing complexity.
Availability
93C56BT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration storage, printer firmware parameter retention, and POS terminal configuration memory requiring stable component supply across extended production lifecycles.
Supply support for 93C56BT-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count nonvolatile memory applications in industrial and legacy 5 V systems, emphasizing reliability, long data retention, and simple 3-wire integration.
FAQ
What is the memory organization of the 93C56BT-I/ST?
The 93C56BT-I/ST has a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants (e.g., 93C56C), this part does not support x16 configuration. The 'B' in the part number confirms the 8-bit word size, and the 'T' suffix indicates tape-and-reel packaging. This simplifies hardware design by eliminating ORG pin routing and logic-level selection.
Does the 93C56BT-I/ST support 3.3 V operation?
No, the 93C56BT-I/ST does not support 3.3 V operation. Its absolute minimum VCC is 4.5 V, and its power-on reset (VPOR) threshold is 3.8 V - operation below that voltage disables all write functions and may corrupt data. For 3.3 V systems, consider the 93LC56B-I/ST (2.5–5.5 V range) instead. Using 93C56BT-I/ST with 3.3 V violates datasheet specifications and risks unreliable behavior.
How is write protection implemented on the 93C56BT-I/ST?
Write protection on the 93C56BT-I/ST uses an EWEN/EWDS protocol: the device powers up in Erase/Write Disable (EWDS) state, blocking all erase/write commands until an explicit EWEN instruction is issued. After programming, an EWDS command restores protection. This prevents accidental writes during power transitions or noise events. Unlike software locks, this is hardware-enforced and active even when VCC is marginal (≥3.8 V).
What is the purpose of the NC pin on the 93C56BT-I/ST?
Pin 6 on the 93C56BT-I/ST is designated NC (No Connection) - it has no internal connection and must not be used as a signal or power path. Per Microchip's datasheet, it should be left floating or tied to VSS for mechanical stability and noise reduction. It is not a strap pin, test point, or reserved function; routing traces or applying voltage to this pin violates the device specification and may cause undefined behavior.
Can the 93C56BT-I/ST be used in automotive applications?
The 93C56BT-I/ST is rated for industrial temperature (–40°C to +85°C), not automotive (–40°C to +125°C). While it may function thermally in some under-dash locations, it lacks AEC-Q100 qualification and its 3.8 V VPOR threshold is unsuitable for automotive cranking profiles. For automotive use, select the 93C56B-E/ST (E-grade) variant, which is explicitly qualified for 125°C operation and meets automotive voltage transient requirements.
93C56BT-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:
- 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 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
93C56BT-I/ST FAQ
1.How can I place an order for 93C56BT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56BT-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 93C56BT-I/ST reliable?
The price and inventory of 93C56BT-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 93C56BT-I/ST is usually 5 days.
3.What payment methods are accepted for 93C56BT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56BT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56BT-I/ST?
93C56BT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56BT-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 93C56BT-I/ST?
For technical support, including 93C56BT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56BT-I/ST requirements.
6.How does Aetrix verify that 93C56BT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93C56BT-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 93C56BT-I/ST meets industry standards.
7.What is the process for return or replacement of 93C56BT-I/ST?
All 93C56BT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C56BT-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 93C56BT-I/ST part is unused and in its original packaging.
Return procedure for 93C56BT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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