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Microchip Technology 93LC56BT-E/ST
- Part No.:
- 93LC56BT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56BT-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:269
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Product details
Overview
93LC56BT-E/ST from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and automotive-grade temperature support (−40°C to +125°C). It features self-timed erase/write cycles, 1 million endurance cycles, and >200 years data retention - deployed in engine control units for calibration storage.
For engineers reviewing the 93LC56BT-E/ST datasheet, 93LC56BT-E/ST pinout, 93LC56BT-E/ST application, or 93LC56BT-E/ST equivalent, key selection criteria include its TSSOP-8 package, automotive qualification, 8-bit fixed organization (no ORG pin), and Ready/Busy status signaling via DO pin during programming.
Technical Context
This device implements a synchronous serial Microwire protocol with CS/CLK/DI/DO signals and no ORG pin - confirming fixed 256 × 8-bit memory mapping. Its internal logic enforces power-on write protection, automatic ERAL before WRAL, and EWEN/EWDS command-based write enable/disable sequencing.
Timing is governed by strict AC parameters: max 2 MHz clock frequency at 2.5 V, 6 ms typical erase/write cycle time, and 200 ns DO propagation delay. The DO pin serves dual function - data output during READ and active-low Ready/Busy indicator during programming - requiring CS reassertion ≥250 ns after completion to clear status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit); fixed x8 organization - no ORG pin required or functional. |
| VCC Range | 2.5 V to 5.5 V - supports wide-input industrial and automotive power rails without external regulation. |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware parameter updates in telematics modules. |
| Data Retention | >200 years at 25°C - ensures calibration data integrity over full vehicle lifecycle. |
| Operating Temp | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and transmission control applications. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage on microcontrollers. |
| Write Cycle Time | 6 ms typical - deterministic timing for real-time system watchdog coordination. |
Pinout & Package
93LC56BT-E/ST is packaged in an 8-lead TSSOP (ST suffix), Pb-free matte tin finish, 3.0 mm × 4.4 mm body, 0.65 mm pitch. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; stops/resumes freely - simplifies host MCU timing budgeting. |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; high-impedance when deselected. |
| 4 (DO) | Data Output / Status | Outputs read data or active-low Ready/Busy; enters High-Z on CS falling edge. |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; requires low-impedance connection to minimize noise coupling. |
| 6 (NC) | No Connect | Internally unconnected - must remain floating or tied to VSS per layout guidelines. |
| 7 (ORG) | Organization | No internal connection on 'A'/'B' variants - physically present but electrically inactive on 93LC56BT-E/ST. |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; internal POR circuit triggers at ~1.5 V - prevents spurious writes during brown-out. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control - host MCU only monitors DO pin for completion. |
| Automatic ERAL before WRAL | Guarantees clean memory array prior to bulk write - prevents data corruption without software overhead. |
| Power-On/Off Data Protection | Hardware-enforced write inhibition below 1.5 V VCC - removes need for external supervisor IC in cost-sensitive designs. |
| Ready/Busy Status on DO | Single-pin status reporting reduces PCB routing complexity and frees GPIO resources on resource-constrained MCUs. |
| Sequential Read Mode | Enables fast dump of contiguous memory blocks (e.g., sensor calibration tables) with single CS assertion. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing fuel injection timing maps and OBD-II diagnostic fault codes that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed write integrity during vehicle cranking (low-VCC transients). Use Value: 2.5 V minimum operating voltage and hardware brown-out protection ensure reliable writes even during 6 V battery dips. | Use Scenario: Holding camera lens calibration offsets and radar beamforming coefficients updated during factory setup and field service. IC Role / Device Role / Timing Role: Secure, long-life parameter storage interfaced to ADAS SoC via minimal 3-wire GPIOs. Use Value: 1M endurance and >200-year retention eliminate recalibration requirements over 15-year vehicle service life. |
| Transmission Control Module (TCM) | Electric Power Steering (EPS) |
Use Scenario: Recording gear shift adaptation values and torque converter clutch learning history across service intervals. IC Role / Device Role / Timing Role: Automotive-grade EEPROM co-located with TCM MCU for real-time parameter logging. Use Value: −40°C to +125°C operation matches under-hood thermal envelope; TSSOP-8 footprint enables compact placement near MCU. | Use Scenario: Storing motor position zero-point offsets and assist torque lookup tables subject to periodic field updates. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory supporting ASIL-B functional safety requirements via deterministic write timing. Use Value: 6 ms max write cycle and DO status signaling allow precise timeout handling in EPS safety monitor firmware. |
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 | Industrial grade (−40°C to +85°C); same 256 × 8-bit organization and TSSOP-8 package. | Not qualified for under-hood automotive use; suitable for cabin electronics or industrial controllers. | Select if ambient temperature stays ≤85°C and AEC-Q100 compliance is not required. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, industrial temp; no Ready/Busy pin - relies on WIP flag polling. | Lacks DO-based status signaling; requires additional software overhead for write completion detection. | Choose only if SPI is already used elsewhere in design and deterministic timing is less critical than pin count. |
Compared with 93LC56B-I/ST, the 93LC56BT-E/ST adds automotive qualification and guaranteed operation up to +125°C; versus AT25020B-MAHL-T, it offers simpler 3-wire timing control and hardware-ready signaling - critical for safety-critical automotive subsystems.
Availability
93LC56BT-E/ST is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and electric power steering systems requiring stable component supply across extended production lifecycles.
Supply support for 93LC56BT-E/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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LCxx family was designed specifically for cost-sensitive, low-power embedded systems requiring robust nonvolatile storage - emphasizing automotive reliability, Microwire compatibility, and minimal board space.
FAQ
What is the memory organization of the 93LC56BT-E/ST?
The 93LC56BT-E/ST is a fixed 256 × 8-bit (2 Kbit) EEPROM with no ORG pin functionality - it operates exclusively in x8 mode. This is confirmed by its 'A' suffix designation in the 93LC56A/B/C family and absence of ORG pin activation in the device selection table and pin function table. The 93LC56BT-E/ST does not support x16 configuration.
Does the 93LC56BT-E/ST require an external pull-up resistor on the DO pin?
No, the 93LC56BT-E/ST does not require an external pull-up on DO. During READ, DO actively drives data; during READY/BUSSY status polling, it actively drives low (busy) or high (ready). When CS is low or during standby, DO is in High-Z state - a pull-up is unnecessary and may interfere with status detection. External resistors are only recommended for DI/DO bus-sharing configurations, not standard use.
Can the 93LC56BT-E/ST be used in place of a 93LC56B-I/ST?
The 93LC56BT-E/ST is pin-compatible and functionally identical to the 93LC56B-I/ST except for temperature rating: the 'T' suffix denotes automotive grade (−40°C to +125°C) versus industrial (−40°C to +85°C). Electrical specs, timing, and instruction set are identical. Substitution is valid where extended temperature operation is required - no PCB or firmware changes needed.
What is the purpose of the NC pin (Pin 6) on the 93LC56BT-E/ST?
Pin 6 on the 93LC56BT-E/ST is designated NC (No Connection) and has no internal connection. It must be left floating or tied to VSS per Microchip's layout recommendations - never driven or used as a signal trace. This pin exists for mechanical symmetry in the TSSOP-8 package and is unrelated to the ORG function, which is absent on all 'A' and 'B' variants including this part.
How does the 93LC56BT-E/ST handle power loss during a write operation?
The 93LC56BT-E/ST incorporates hardware power-loss protection: its internal POR circuit inhibits all write operations when VCC drops below ~1.5 V. This prevents partial writes and data corruption during brown-out conditions. No external supervisor IC is required - the device automatically halts programming and retains valid data from prior completed cycles, ensuring robustness in automotive electrical environments.
93LC56BT-E/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:
- 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:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC56BT-E/ST FAQ
1.How can I place an order for 93LC56BT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56BT-E/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 93LC56BT-E/ST reliable?
The price and inventory of 93LC56BT-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56BT-E/ST is usually 5 days.
3.What payment methods are accepted for 93LC56BT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56BT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56BT-E/ST?
93LC56BT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56BT-E/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 93LC56BT-E/ST?
For technical support, including 93LC56BT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56BT-E/ST requirements.
6.How does Aetrix verify that 93LC56BT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56BT-E/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 93LC56BT-E/ST meets industry standards.
7.What is the process for return or replacement of 93LC56BT-E/ST?
All 93LC56BT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56BT-E/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 93LC56BT-E/ST part is unused and in its original packaging.
Return procedure for 93LC56BT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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