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Microchip Technology 93LC56BT/ST
- Part No.:
- 93LC56BT/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56BT/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,896
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Product details
Overview
93LC56BT/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 industrial temperature grade (−40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status via DO pin, and 1,000,000 endurance cycles. Used in microcontroller-based systems for storing calibration data, configuration settings, and firmware parameters.
For engineers reviewing the 93LC56BT/ST datasheet, 93LC56BT/ST pinout, 93LC56BT/ST application, or 93LC56BT/ST equivalent, key selection criteria include its 8-bit organization (no ORG pin), TSSOP-8 package, 3-wire serial protocol compatibility, write cycle time of 6 ms, and support for sequential read and power-on data protection.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It operates in dedicated 8-bit mode ('A' version), eliminating ORG pin dependency-pin 6 is NC. Internal logic enforces power-on write protection below 1.5 V and requires EWEN command prior to any erase/write operation.
Memory access uses 7-bit addressing (A6–A0), supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions, and delivers data output with 20-clock-cycle timing (TPD ≤ 400 ns at 1.8 V). Standby current is ≤5 µA, and all operations are validated across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit organization) |
| VCC range | 2.5 V to 5.5 V - supports single-supply operation in 3.3 V and 5 V systems |
| Interface | 3-wire Microwire-compatible serial - minimal GPIO usage, no SPI mode bits required |
| Write cycle time | 6 ms max - enables deterministic firmware timeout handling during programming |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent parameter updates in field-deployed devices |
| Data retention | 200 years - ensures long-term reliability without battery backup |
| Temp range | −40°C to +85°C (Industrial) - qualified for embedded control and instrumentation environments |
| Package | TSSOP-8 (ST) - 3 mm × 4.4 mm footprint, surface-mount compatible with automated assembly |
Pinout & Package
8-pin Thin Shrink Small Outline Package (TSSOP), Pb-free Matte Tin finish, 0.65 mm pitch. Pin 1 marked by laser dot; pin 6 is NC (no internal connection) per 'A'-version specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed write on falling edge |
| 2 CLK | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; stoppable mid-sequence without corruption |
| 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 (low = busy); enters High-Z on CS falling edge |
| 5 VSS | Ground | Reference return path for all I/O and core logic; decoupling capacitor required near pin |
| 6 NC | No Connection | Not bonded internally; must be left floating or tied to VSS per layout best practice |
| 7 ORG | Organization Select | NC on 93LC56B/T - not used; differs from 'C' versions where it selects x8/x16 mode |
| 8 VCC | Power Supply | 2.5–5.5 V input; internal POR circuit triggers at ~1.5 V to prevent partial writes during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry; 6 ms max cycle time includes auto-erase, enabling simple firmware polling |
| Ready/Busy status on DO | Allows real-time monitoring of programming progress without additional pins or interrupts |
| Automatic ERAL before WRAL | Guarantees full array readiness before bulk write, preventing partial data corruption |
| Power-on/off data protection | Hardware-enforced lockout below 1.5 V VCC prevents inadvertent writes during power ramp |
| Sequential read mode | Enables fast bulk readout (e.g., config tables) with single CS assertion and continuous clocking |
| EWEN/EWDS security | Explicit enable/disable commands prevent accidental writes; device powers up in locked (EWDS) state |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific gain/offset coefficients and tariff tables updated during field calibration. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes but guaranteed retention over 20+ years. Use Value: Eliminates need for battery-backed SRAM; 1M endurance supports lifetime recalibration events. | Use Scenario: Holding user-defined I/O mapping, PID tuning constants, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to MCU GPIOs with minimal pin count. Use Value: TSSOP-8 package fits dense PCB layouts; 3-wire interface reduces MCU resource load vs. SPI flash. |
| Medical Device Settings Backup | Automotive Body Control Module NVM |
Use Scenario: Retaining patient-specific therapy parameters and device usage logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power, tamper-resistant storage accessible during brief wake-up intervals. Use Value: 5 µA standby current extends battery life; power-loss protection ensures data integrity during unexpected shutdown. | Use Scenario: Saving seat/mirror position presets, lighting profiles, and error codes in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Industrial-grade EEPROM tolerant of automotive voltage transients and thermal cycling. Use Value: Qualified to −40°C to +85°C; 2.5 V min VCC supports operation during cold-crank conditions. |
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 | Same 256 × 8-bit organization, identical TSSOP-8 package and pinout, same 2.5–5.5 V range | No functional difference; 'B' suffix denotes same industrial temp grade and packaging | Select if cross-referenced as direct replacement in legacy BOMs; functionally identical to 93LC56BT/ST |
| AT25020B-SSHL-T | 2 Kbit SPI interface (4-wire), 1.8–5.5 V, 5 MHz max clock, no Ready/Busy pin - requires software polling or fixed delays | Lacks DO-based status signaling; higher pin count; supports faster random reads but slower bulk writes | Choose for SPI-native designs or where higher clock speed justifies added pin and protocol complexity |
Compared with 93LC56B-I/ST, the 93LC56BT/ST offers identical functionality and drop-in compatibility; versus AT25020B-SSHL-T, it trades SPI speed for simpler 3-wire wiring and hardware-ready signaling-critical for resource-constrained MCUs.
Availability
93LC56BT/ST is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and medical device settings backup requiring stable component supply, long-term obsolescence planning, and RoHS-compliant sourcing.
Supply support for 93LC56BT/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 nonvolatile memory solutions, headquartered in Chandler, Arizona.
The 93LC56BT/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable, low-power, and easy-to-integrate nonvolatile storage.
FAQ
What is the memory organization of the 93LC56BT/ST?
The 93LC56BT/ST is a 256 × 8-bit (2 Kbit) device with fixed 8-bit organization-no ORG pin is used. This distinguishes it from 'C' variants that support x8/x16 selection. The 'A' suffix in its family designation confirms dedicated 8-bit communication, simplifying interface design and eliminating external ORG biasing requirements for the 93LC56BT/ST.
Does the 93LC56BT/ST require an external pull-up resistor on the DO pin?
No, the 93LC56BT/ST does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when deselected or idle. However, if DI and DO are shorted (shared bus), a series resistor (~1 kΩ) is recommended to prevent bus conflict during dummy-zero read phases-this applies to the 93LC56BT/ST only in shared-bus configurations.
What is the minimum VCC required for reliable write operation of the 93LC56BT/ST?
The 93LC56BT/ST requires VCC ≥ 2.5 V for all operations, including write. Its internal power-on reset (POR) circuit disables write functions below ~1.5 V to prevent corruption. For guaranteed 6 ms write cycle timing and full 1M endurance, operation within the specified 2.5–5.5 V range-particularly ≥2.7 V-is recommended. Below 2.5 V, the 93LC56BT/ST will not accept commands.
Can the 93LC56BT/ST be used in automotive applications?
The 93LC56BT/ST is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). While it may function in some under-hood environments, Microchip does not qualify or guarantee the 93LC56BT/ST for AEC-Q100 compliance or extended-temperature automotive use. For such applications, select the 93LC56BT-E/ST (E-grade) variant instead-the 93LC56BT/ST is intended for industrial and commercial systems only.
How is write protection implemented on the 93LC56BT/ST?
Write protection on the 93LC56BT/ST is implemented via dual hardware and command-level mechanisms: (1) Power-on write disable-device powers up in EWDS (Erase/Write Disable) mode, blocking all programming until EWEN is issued; (2) Voltage-based lockout-internal POR circuit inhibits writes when VCC < ~1.5 V. Both features ensure the 93LC56BT/ST remains immune to spurious writes during power transitions or noise events.
93LC56BT/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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC56BT/ST FAQ
1.How can I place an order for 93LC56BT/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56BT/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/ST reliable?
The price and inventory of 93LC56BT/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/ST is usually 5 days.
3.What payment methods are accepted for 93LC56BT/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56BT/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56BT/ST?
93LC56BT/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56BT/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/ST?
For technical support, including 93LC56BT/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56BT/ST requirements.
6.How does Aetrix verify that 93LC56BT/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56BT/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/ST meets industry standards.
7.What is the process for return or replacement of 93LC56BT/ST?
All 93LC56BT/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56BT/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/ST part is unused and in its original packaging.
Return procedure for 93LC56BT/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56BT/ST Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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