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Microchip Technology 93LC56B-E/ST
- Part No.:
- 93LC56B-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56B-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
93LC56B-E/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 automotive temperature range (–40°C to +125°C), and housed in an 8-lead TSSOP package. It delivers self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status signaling via DO pin - used in engine control units for calibration storage.
For engineers reviewing the 93LC56B-E/ST datasheet, 93LC56B-E/ST pinout, 93LC56B-E/ST application, or 93LC56B-E/ST equivalent, key selection criteria include its 16-bit organization, automotive-grade reliability, 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire controllers in safety-critical embedded systems.
Technical Context
The 93LC56B-E/ST implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring no external ORG pin (dedicated x16 mode). Its instruction set includes READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS - all executed via rising-edge clocked bit streams with fixed opcode/address/data lengths per operation.
Internal power-on reset and voltage-detect circuitry (VPOR = 1.5 V typical) inhibit write operations below VCC threshold; EWEN/EWDS commands provide software-level write protection. The device enters Standby mode when CS is low, drawing only 1 µA (I-temp) or 5 µA (E-temp) current, and asserts Ready/Busy on DO during self-timed programming cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (128 words × 16 bits) - fixed x16 organization eliminates need for external ORG logic in 16-bit host systems. |
| VCC range | 2.5 V to 5.5 V - supports wide supply rails including 3.3 V and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware parameter updates in automotive diagnostics modules. |
| Data retention | >200 years at +25°C - ensures calibration data integrity over full vehicle lifecycle without refresh. |
| Write cycle time | 6 ms max (TWC) - deterministic timing allows precise host CPU scheduling of nonvolatile writes. |
| Operating temp | –40°C to +125°C (Automotive E-grade) - qualified for under-hood ECUs and transmission control units. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and discrete shift-register controllers. |
Pinout & Package
8-lead TSSOP (ST) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC, Pin 7 = NC, Pin 8 = VCC. No ORG pin - fixed 16-bit organization confirmed for 93LC56B variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge for 93LC devices. |
| CLK | Serial Clock | Rising-edge synchronized I/O; clocking may pause mid-sequence; no clocks required during auto-erase/write. |
| DI | Data Input | Accepts Start bit, opcode, address, and data; high-impedance when not selected; requires pull-down on CS for noise immunity. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status valid after ≥250 ns CS low time. |
| VSS | Ground | Reference for all I/O and internal logic; must be connected before VCC during power-up sequencing. |
| VCC | Power Supply | 2.5–5.5 V supply; internal POR circuit disables writes below 1.5 V; ≥4.5 V required for ERAL/WRAL operations. |
| NC (Pins 6 & 7) | No Connection | Unused silicon pads; electrically isolated; no PCB routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components and host polling overhead - write completes in fixed 6 ms regardless of VCC or temperature. |
| Automatic ERAL before WRAL | Guarantees full-array erasure prior to bulk write, preventing partial-data corruption during firmware update sequences. |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC threshold prevents accidental writes during brown-out or hot-swap events. |
| Ready/Busy status on DO | Enables efficient host polling without dedicated status lines - reduces BOM count and simplifies PCB layout in space-constrained ECUs. |
| 128 × 16-bit organization | Matches native word width of many 16-bit MCUs (e.g., dsPIC33, C2000), eliminating software bit-packing and improving code efficiency. |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Storing adaptive fuel trim tables and knock sensor learning values across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to 16-bit MCU via Microwire peripheral. Use Value: 1M endurance supports daily recalibration; 200-year retention ensures data survival beyond vehicle service life. | Use Scenario: Holding gear ratio calibration and clutch wear compensation parameters updated during test drives. IC Role / Device Role / Timing Role: Serial EEPROM providing fault-tolerant storage for mission-critical drivetrain parameters. Use Value: Automotive-grade temperature rating (–40°C to +125°C) guarantees operation in transmission oil pan environments. |
| Body Control Module (BCM) | Advanced Driver Assistance System (ADAS) Camera ECU |
Use Scenario: Retaining window position memory and mirror angle settings after battery disconnect. IC Role / Device Role / Timing Role: Low-power serial memory accessed during wake-up sequence to restore user preferences. Use Value: 1 µA standby current extends battery life during vehicle sleep mode; 2.5 V minimum VCC enables operation with weak backup batteries. | Use Scenario: Storing lens focus calibration and image sensor offset correction coefficients during factory programming. IC Role / Device Role / Timing Role: Factory-programmable NVM storing camera-specific tuning data written once at end-of-line test. Use Value: WRAL command enables single-command bulk write of full 128-word calibration table, reducing test time by >40% vs. individual writes. |
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 temperature grade (–40°C to +85°C); identical electrical specs and pinout. | Not qualified for under-hood automotive use; suitable for cabin electronics or industrial controls. | Select only if ambient operating temperature remains ≤+85°C and AEC-Q100 compliance is not required. |
| AT25128B-MAHL-T | SPI interface (4-wire), 128 Kbit capacity, 1.8–5.5 V VCC, 5 MHz max clock; no Ready/Busy pin. | Requires SPI master instead of Microwire; larger memory but lacks hardware status signaling for real-time write monitoring. | Choose when migrating to SPI architecture or needing higher density; verify host firmware supports SPI protocol and software polling. |
Compared with 93LC56B-I/ST, the 93LC56B-E/ST adds automotive qualification and extended high-temperature operation; compared with AT25128B-MAHL-T, it retains Microwire compatibility and hardware Ready/Busy signaling at lower density - critical for legacy automotive MCU platforms.
Availability
93LC56B-E/ST is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and body control modules requiring stable component supply across long production lifecycles and automotive qualification traceability.
Supply support for 93LC56B-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 microcontrollers, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LCxx series was designed specifically for cost-sensitive, low-power, serial EEPROM applications in automotive, industrial, and consumer systems requiring Microwire compatibility and robust data retention.
FAQ
What is the memory organization of the 93LC56B-E/ST?
The 93LC56B-E/ST has a fixed 128 × 16-bit (2 Kbit) organization. Unlike 'C' variants, it does not have an ORG pin - the 'B' suffix denotes dedicated 16-bit mode. This eliminates external configuration logic and simplifies interface with 16-bit microcontrollers. The 93LC56B-E/ST stores data as 128 words of 16 bits each, accessible via Microwire-compatible serial commands.
Does the 93LC56B-E/ST require an external ORG pin connection?
No, the 93LC56B-E/ST does not require or support an ORG pin. As a 'B'-suffix device, it is factory-configured for 16-bit operation only. Pins 6 and 7 in the TSSOP package are marked NC (No Connection) in the datasheet and must remain unconnected. The 93LC56B-E/ST achieves x16 organization internally without external biasing.
What is the maximum clock frequency supported by the 93LC56B-E/ST?
The 93LC56B-E/ST supports up to 2 MHz clock frequency across its full VCC range of 2.5 V to 5.5 V. At VCC ≥ 4.5 V, the maximum clock frequency increases to 3 MHz for 'C' variants only; the 93LC56B-E/ST is limited to 2 MHz regardless of supply voltage. This ensures reliable timing margin in automotive environments with voltage transients.
How does the Ready/Busy status function on the 93LC56B-E/ST?
The 93LC56B-E/ST asserts Ready/Busy status on the DO pin: DO = low indicates active erase/write operation; DO = high indicates completion. To read status, CS must be brought high for ≥250 ns after the initial CS low pulse that started the operation. The 93LC56B-E/ST does not require continuous clocking during status polling - DO remains valid until next CS assertion.
Is the 93LC56B-E/ST AEC-Q100 qualified?
Yes, the 93LC56B-E/ST is automotive-qualified per AEC-Q100 Grade 1 (–40°C to +125°C), as indicated by the 'E' suffix in the part number and confirmed in the DS21794G datasheet. It undergoes stress testing for temperature cycling, HTOL, and ESD per AEC standards. The 93LC56B-E/ST is intended for use in engine, transmission, and chassis control modules where automotive reliability is mandatory.
93LC56B-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
93LC56B-E/ST FAQ
1.How can I place an order for 93LC56B-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56B-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 93LC56B-E/ST reliable?
The price and inventory of 93LC56B-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 93LC56B-E/ST is usually 5 days.
3.What payment methods are accepted for 93LC56B-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56B-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56B-E/ST?
93LC56B-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56B-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 93LC56B-E/ST?
For technical support, including 93LC56B-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56B-E/ST requirements.
6.How does Aetrix verify that 93LC56B-E/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56B-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 93LC56B-E/ST meets industry standards.
7.What is the process for return or replacement of 93LC56B-E/ST?
All 93LC56B-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56B-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 93LC56B-E/ST part is unused and in its original packaging.
Return procedure for 93LC56B-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56B-E/ST Tags
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