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Microchip Technology 93LC56BT-E/MS
- Part No.:
- 93LC56BT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC56BT-E/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,297
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Product details
Overview
93LC56BT-E/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 automotive temperature range (–40°C to +125°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 parameter storage in automotive body control modules.
For engineers reviewing the 93LC56BT-E/MS datasheet, 93LC56BT-E/MS pinout, 93LC56BT-E/MS application, or 93LC56BT-E/MS equivalent, key selection criteria include its automotive-grade temperature rating, 256 × 8-bit fixed organization (no ORG pin), 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire host controllers requiring CS/CLK/DI/DO timing compliance.
Technical Context
The 93LC56BT-E/MS implements a synchronous serial Microwire interface with dedicated CS, CLK, DI, and DO pins - no internal address counter or I²C addressing. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are initiated by a Start bit followed by opcode, address, and data bits clocked on rising CLK edges.
It uses a self-timed internal programming architecture: after CS falls (for 93LC versions), the device executes auto-erase-and-write without external timing control. Ready/Busy status is signaled via DO pin polling, and power-on reset circuitry holds writes disabled until VCC exceeds 1.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit organization; fixed, no ORG pin) |
| VCC range | 2.5 V to 5.5 V - supports wide-input industrial and automotive rails |
| Temp grade | Automotive (E): –40°C to +125°C - qualified for under-hood and chassis applications |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration or fault-log updates |
| Data retention | >200 years at +85°C - ensures lifetime data integrity in sealed automotive modules |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, no address lines required |
| Write cycle time | 6 ms typical (TWC) - deterministic latency for firmware-triggered parameter saves |
| Standby current | 1 µA max (ICCS, I-temp) - ultra-low quiescent draw during vehicle sleep mode |
Pinout & Package
8-lead MSOP (150 mil) package with exposed pad (optional VSS connection), Pb-free Matte Tin finish. Pin 1 marked by laser dot; pin 1 location confirmed per Microchip DS21794G-page 17 drawing.
| 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 | Rising-edge synchronized I/O; clock high/low times defined per VCC (e.g., 200 ns min @ 5.5 V) |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; no pull-up required |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or not reading |
| 5 (VSS) | Ground | Reference return path; exposed pad may be connected to VSS for thermal/mechanical stability |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS (not VCC) |
| 7 (ORG) | Organization | No internal connection on 93LC56B/T variants - pin is NC, not used |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; internal POR triggers at ~1.5 V; powers all logic and memory array |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or watchdog timeout logic in host MCU firmware |
| Auto-ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial-program corruption |
| Power-on/off data protection | Hardware-enforced write inhibit below 1.5 V VCC - prevents spurious writes during brown-out |
| Ready/Busy polling via DO | Enables non-blocking host operation: MCU can perform other tasks while waiting for write completion |
| Sequential read mode | Reduces command overhead: holding CS high allows continuous 8-bit reads across address space |
| Pb-free & RoHS compliant | Meets automotive ELV Directive requirements; Matte Tin finish ensures solderability and wire-bond compatibility |
Applications
| Automotive Body Control Unit (BCU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in a vehicle BCU module. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed infrequently during user setup or power-up initialization. Use Value: 200-year data retention ensures settings persist over full vehicle lifetime without battery backup. | Use Scenario: Holding calibrated sensor offsets, I/O mapping tables, and firmware update flags in a DIN-rail PLC. IC Role / Device Role / Timing Role: Low-pin-count configuration memory interfaced directly to an 8-bit microcontroller's GPIO port. Use Value: 1 M endurance supports daily recalibration logs over 2,700+ days without wear-out risk. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Saving flow-rate calibration coefficients and safety lockout states in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical persistent memory with hardware write-protection (EWDS/EWEN) and POR enforcement. Use Value: Power-on data protection prevents invalid calibration loads during AC power cycling or battery swap. | Use Scenario: Storing tariff schedules, meter ID, and tamper-event counters in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure, long-life storage for regulatory-mandated operational records. Use Value: Automotive-grade temperature rating (–40°C to +125°C) ensures reliability in outdoor meter enclosures exposed to solar heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-I/MS | Same 256 × 8-bit organization and MSOP package, but rated for Industrial (–40°C to +85°C) only | Not qualified for under-hood or engine bay use; unsuitable where ambient exceeds +85°C | Select only for cost-sensitive industrial controls with controlled ambient environments |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, Industrial temp, SOIC-8 package | Requires separate SPI peripheral or bit-banged GPIO; lacks ERAL/WRAL atomic operations | Choose when existing design uses SPI infrastructure and does not require Microwire compatibility or bulk-erase primitives |
Compared with 93LC56BT-I/MS, the 93LC56BT-E/MS provides guaranteed operation up to +125°C - critical for automotive placement near power electronics. Versus AT25020B-MAHL-T, it retains native Microwire timing and instruction set, avoiding firmware rework for legacy host drivers.
Availability
93LC56BT-E/MS is available at Aetrix Electronics and suitable for automotive body control units, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93LC56BT-E/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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56x series targets cost-sensitive, low-power embedded systems requiring simple, reliable nonvolatile storage - optimized for Microwire host interfaces in automotive, industrial, and medical applications where pin count and firmware simplicity are critical.
FAQ
What is the memory organization of the 93LC56BT-E/MS?
The 93LC56BT-E/MS has a fixed 256 × 8-bit organization (2 Kbit total). It belongs to the 'B' variant family and does not include an ORG pin - unlike 'C' variants, it cannot be configured for 16-bit operation. This simplifies PCB layout and firmware design by eliminating external configuration logic.
Does the 93LC56BT-E/MS require an external pull-up resistor on the DO pin?
No, the 93LC56BT-E/MS does not require an external pull-up on DO. The pin actively drives high/low during READ and Ready/Busy polling, and enters High-Z when inactive. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict during dummy-zero read phases.
What is the minimum VCC voltage required to enable write operations on the 93LC56BT-E/MS?
The 93LC56BT-E/MS requires VCC ≥ 2.5 V to operate, but write operations are hardware-inhibited until VCC rises above the internal power-on reset threshold of approximately 1.5 V. Below this level, all instructions (including EWEN) are ignored - ensuring data integrity during power ramp-up or brown-out conditions.
Can the 93LC56BT-E/MS be used as a direct replacement for the 93LC56B-I/MS in an existing design?
Yes, the 93LC56BT-E/MS is pin-compatible and functionally identical to the 93LC56B-I/MS, except for its extended automotive temperature rating (–40°C to +125°C vs. –40°C to +85°C). No PCB or firmware changes are needed - the 'E' grade simply adds higher-temperature qualification and screening.
How does the ERAL (Erase All) command interact with the WRAL (Write All) command in the 93LC56BT-E/MS?
In the 93LC56BT-E/MS, the WRAL command automatically executes an ERAL cycle before writing - no separate ERAL instruction is required. This atomic behavior ensures the entire array is erased to 0xFF before new data is written, preventing stale bits from corrupting the bulk update. VCC must be ≥4.5 V for both ERAL and WRAL to function correctly.
93LC56BT-E/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:
- 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-MSOP
93LC56BT-E/MS FAQ
1.How can I place an order for 93LC56BT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56BT-E/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 93LC56BT-E/MS reliable?
The price and inventory of 93LC56BT-E/MS 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/MS is usually 5 days.
3.What payment methods are accepted for 93LC56BT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56BT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56BT-E/MS?
93LC56BT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56BT-E/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 93LC56BT-E/MS?
For technical support, including 93LC56BT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56BT-E/MS requirements.
6.How does Aetrix verify that 93LC56BT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93LC56BT-E/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 93LC56BT-E/MS meets industry standards.
7.What is the process for return or replacement of 93LC56BT-E/MS?
All 93LC56BT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56BT-E/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 93LC56BT-E/MS part is unused and in its original packaging.
Return procedure for 93LC56BT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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