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Microchip Technology 93LC56BT-I/ST
- Part No.:
- 93LC56BT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56BT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,524
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Product details
Overview
93LC56BT-I/ST from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, rated for industrial temperature range (−40°C to +85°C), and housed in an 8-lead TSSOP package. It delivers self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status signaling - used in microcontroller-based system configuration storage and calibration data retention.
For engineers reviewing the 93LC56BT-I/ST datasheet, 93LC56BT-I/ST pinout, 93LC56BT-I/ST application, or 93LC56BT-I/ST equivalent, key selection criteria include its fixed 16-bit organization (no ORG pin), TSSOP-8 footprint compatibility, 6 ms program cycle time, 1 million endurance cycles, and support for sequential read and WRAL/ERAL commands in embedded control systems.
Technical Context
The 93LC56BT-I/ST implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins, requiring no external clock conditioning. Its internal logic decodes 11-bit instructions (e.g., READ, WRITE, ERAL) and supports 7-bit addressing for 128 words in x16 mode.
It features on-chip power-on/off protection, EWEN/EWDS write-enable/disable control, and automatic erase-before-write functionality. The DO pin serves dual role: serial data output during READ and Ready/Busy status indicator during programming - active only when CS is reasserted after ≥250 ns low time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 × 16-bit) - fixed x16 organization; no ORG pin; no word-size reconfiguration. |
| VCC range | 2.5 V to 5.5 V - supports wide supply rails including 3.3 V and 5 V systems without level shifting. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - compatible with legacy PIC® MCU peripherals and simple GPIO bit-banging. |
| Write cycle time | 6 ms typical - self-timed; includes auto-erase; enables deterministic firmware timing for non-blocking polling. |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, VCC = 5.0 V; ensures long-term reliability in field-updatable systems. |
| Data retention | 200 years - specified at 25°C; guarantees calibration or configuration data integrity over product lifetime. |
| Temp range | −40°C to +85°C (Industrial grade) - qualified per AEC-Q100 Class 2 for extended ambient operation. |
Pinout & Package
8-lead TSSOP (ST) package, 3.0 mm × 4.4 mm body, 0.65 mm pitch, exposed pad optional (not electrically connected). Pin 1 marked by laser dot; pin 1 corner located at bottom-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICCS ≤ 5 µA). |
| 2 (CLK) | Serial Clock | Positive-edge synchronized; max 3 MHz @ VCC ≥ 4.5 V; stoppable mid-transfer; no clock required during self-timed write. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and data; high-impedance when CS = low; requires pull-down if shared with DO. |
| 4 (DO) | Data Output / Status | Tri-state output; delivers 16-bit data on READ; asserts low = Busy, high = Ready during ERASE/WRITE; enters High-Z on CS falling edge. |
| 5 (VSS) | Ground | Reference return for all I/O and core logic; must be low-impedance connection to minimize noise coupling. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice; not usable as strap or debug pin. |
| 7 (NC) | No Connect | Same as Pin 6; dual NC pins reflect family-wide pinout compatibility across A/B/C variants; no functional use. |
| 8 (VCC) | Power Supply | Core and I/O supply; POR threshold = 1.5 V; requires local 100 nF ceramic bypass capacitor within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 16-bit organization | Eliminates ORG pin dependency and external logic; simplifies PCB routing and firmware initialization for x16 systems. |
| Self-timed erase/write | Removes need for external timing control or watchdog timeout; reduces firmware overhead and interrupt latency. |
| Automatic ERAL before WRAL | Guarantees full-array write success without separate erase command; prevents partial writes due to residual data. |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delays; reduces average write latency by >40% in burst-write scenarios. |
| Pb-free & RoHS compliant | Matte tin finish; qualified for lead-free reflow (J-STD-020); meets IPC-J-STD-609A Class 1 marking requirements. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime via SPI-like Microwire interface. Use Value: Enables single-device calibration traceability and field updates without firmware reflashing; leverages 200-year data retention. |
Use Scenario: Retaining user preferences (e.g., timer settings, display brightness) across power cycles in smart microwaves. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to 8-bit MCU with minimal GPIO count. Use Value: Achieves <5 µA standby current and 6 ms write time - critical for battery-backed or energy-harvesting UI modules. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Saving door lock/unlock history, mirror position memory, and lighting profiles in BCMs. IC Role / Device Role / Timing Role: Industrial-grade EEPROM integrated into CAN/LIN subsystems for parameter persistence. Use Value: −40°C to +85°C rating and 1M endurance ensure reliable operation over 15+ year vehicle lifecycle. |
Use Scenario: Storing FDA-mandated usage logs, calibration timestamps, and error counters in portable ultrasound units. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with verified write-cycle integrity. Use Value: Automatic ERAL/WRAL and EWEN/EWDS commands prevent accidental corruption during power brownouts. |
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/SN | Same 128 × 16-bit organization, 2.5–5.5 V, −40°C to +85°C, but in SOIC-8 (SN) package - 3.9 mm × 4.9 mm, 1.27 mm pitch. | SOIC-8 footprint requires larger PCB area and different reflow profile; less suitable for space-constrained portable designs. | Select when legacy SOIC layout reuse or hand-soldering prototyping is prioritized over miniaturization. |
| AT25020B-MAHL-T | 2 Kbit SPI EEPROM (256 × 8-bit), 1.8–5.5 V, −40°C to +85°C, 8-lead TSSOP; uses standard SPI (4-wire), not Microwire. | Requires CS, SCK, SI, SO signals - incompatible pinout and protocol; firmware driver rewrite needed. | Choose only if migrating to SPI ecosystem or requiring faster 20 MHz clock; not drop-in replacement. |
Compared with 93LC56B-I/SN, the 93LC56BT-I/ST offers identical electrical behavior but saves 35% board area; versus AT25020B-MAHL-T, it retains Microwire compatibility and eliminates protocol conversion, though at lower max clock rate (3 MHz vs. 20 MHz).
Availability
93LC56BT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56BT-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 93LC56x series belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC56BT-I/ST?
The 93LC56BT-I/ST has a fixed 128 × 16-bit (2 Kbit) organization. As a 'B' variant, it does not include an ORG pin and operates exclusively in x16 mode - no external configuration is required or supported. This differs from 'C' variants which use the ORG pin to select between x8/x16 modes.
Does the 93LC56BT-I/ST require an external pull-up resistor on the DO pin?
No, the 93LC56BT-I/ST does not require an external pull-up on DO. The DO pin is actively driven high or low during READ or Ready/Busy status reporting, and enters High-Z when CS is low or during non-read operations. A pull-up may cause bus contention if DI and DO are shorted.
Can the 93LC56BT-I/ST be used with a 3.3 V microcontroller without level shifting?
Yes, the 93LC56BT-I/ST operates from 2.5 V to 5.5 V and specifies VIH1 = 2.0 V (min) for VCC ≥ 2.7 V, making it fully compatible with 3.3 V logic families. Its VOL1 = 0.4 V (max) at IOL = 2.1 mA ensures solid low-level margin for 3.3 V receivers.
How is write protection implemented on the 93LC56BT-I/ST?
Write protection is enforced via the EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) instructions. The device powers up in EWDS mode - all erase/write commands are ignored until EWEN is issued. After any write, executing EWDS restores protection, preventing accidental overwrites during noise events or reset glitches.
What is the maximum clock frequency supported by the 93LC56BT-I/ST at 2.5 V?
At VCC = 2.5 V, the 93LC56BT-I/ST supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This limit ensures reliable setup/hold timing (TDIS, TDIH ≥ 250 ns) and data output delay (TPD ≤ 400 ns) under worst-case voltage and temperature conditions.
93LC56BT-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:
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC56BT-I/ST FAQ
1.How can I place an order for 93LC56BT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56BT-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 93LC56BT-I/ST reliable?
The price and inventory of 93LC56BT-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 93LC56BT-I/ST is usually 5 days.
3.What payment methods are accepted for 93LC56BT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56BT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56BT-I/ST?
93LC56BT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56BT-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 93LC56BT-I/ST?
For technical support, including 93LC56BT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56BT-I/ST requirements.
6.How does Aetrix verify that 93LC56BT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56BT-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 93LC56BT-I/ST meets industry standards.
7.What is the process for return or replacement of 93LC56BT-I/ST?
All 93LC56BT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56BT-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 93LC56BT-I/ST part is unused and in its original packaging.
Return procedure for 93LC56BT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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