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Microchip Technology 93LC56B/ST
- Part No.:
- 93LC56B/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56B/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,959
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Product details
Overview
93LC56B/ST from Microchip Technology Inc. is a 2 Kbit, 128 × 16-bit organization serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5 V to 5.5 V, supporting Industrial (–40°C to +85°C) and Automotive (–40°C to +125°C) temperature ranges, and housed in an 8-lead SOIC package (ST). It delivers self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin for embedded system configuration storage.
For engineers reviewing the 93LC56B/ST datasheet, 93LC56B/ST pinout, 93LC56B/ST application, or 93LC56B/ST equivalent, this page provides verified technical context, pin-level design meaning, real-world use scenarios in automotive control modules and industrial sensors, and validated alternative options with documented functional and packaging differences.
Technical Context
The 93LC56B/ST implements a fixed 128 × 16-bit memory map with no ORG pin-unlike C-versions-ensuring deterministic 16-bit word access without external configuration logic. Its Microwire-compatible protocol uses CS, CLK, and DI/DO for opcode, address, and data transfer, with DO serving dual role as data output and Ready/Busy indicator during self-timed 6 ms erase/write operations.
Power-on/off data protection is enforced by internal voltage detection (VPOR = 1.5 V typical), and write security is managed via EWEN/EWDS commands-device powers up in EWDS state, requiring explicit enable before any erase or write. Standby current is ≤5 µA across both temp grades, supporting battery-backed applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (128 × 16-bit organization); enables compact firmware parameter storage without external address decoding logic. |
| VCC Range | 2.5 V to 5.5 V; compatible with 3.3 V and 5 V microcontroller I/O domains without level shifting. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); reduces MCU GPIO count and PCB routing complexity vs. SPI/I²C. |
| Write Cycle Time | 6 ms typical (TWC); self-timed operation eliminates need for external timing control or polling delay estimation. |
| Endurance | 1,000,000 erase/write cycles; supports frequent calibration updates in field-deployed industrial equipment. |
| Data Retention | >200 years at +25°C; ensures long-term reliability of stored configuration data across product lifecycle. |
| Temp Range | Industrial (–40°C to +85°C) and Automotive (–40°C to +125°C); qualified for under-hood and factory-floor environments. |
Pinout & Package
8-lead SOIC package (ST suffix), Pb-free Matte Tin finish, 150 mil body width, standard footprint compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (≤5 µA ICCS) but allows ongoing write completion. |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; clock can pause mid-sequence; no CLK required during self-timed write cycle. |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; tied to DO only with series resistor to prevent bus conflict during read dummy-zero phase. |
| DO | Data Output / Status | Outputs 16-bit read data or Ready/Busy signal (low = busy); enters High-Z on CS falling edge; requires CS high ≥250 ns to sample status. |
| VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling into sensitive analog blocks. |
| NC | No Internal Connection | Pin 7 in ST package; must remain unconnected-no pull-up/down or routing; not usable as spare GPIO. |
| VCC | Power Supply | Supplies core logic and memory array; internal POR circuit holds device reset until VCC ≥1.5 V; decoupling capacitor mandatory near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry and software delay loops-write completes in guaranteed 6 ms, freeing MCU resources. |
| Automatic ERAL before WRAL | Ensures full-array write integrity without separate erase command; prevents partial-write corruption in power-fail scenarios. |
| Ready/Busy via DO pin | Enables efficient polling-based write confirmation without dedicated status lines or interrupt overhead. |
| Power-On/Off Data Protection | Hardware-enforced write inhibition below 1.5 V VCC prevents accidental corruption during brown-out or hot-swap events. |
| EWEN/EWDS Security | Explicit enable/disable sequence prevents unintended writes during firmware updates or debug sessions-critical for ASIL-B systems. |
Applications
| Automotive Body Control Module | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicle BCMs. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced to 8-bit MCU via Microwire; accessed during power-up and user adjustment. Use Value: 128 × 16-bit layout matches common 16-bit parameter sets; 1M endurance supports lifetime recalibration; –40°C to +125°C rating meets AEC-Q100 Grade 1 requirements. |
Use Scenario: Holding factory-calibrated offset/gain coefficients for pressure and temperature transducers in process instrumentation. IC Role / Device Role / Timing Role: Write-once-during-manufacturing + occasional field update memory; accessed via isolated UART-to-Microwire bridge IC. Use Value: 2.5 V min VCC enables direct connection to 3.3 V sensor supply rail; >200-year retention guarantees calibration validity over 15+ year product service life. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing drug library limits, alarm thresholds, and dose history logs in Class II medical devices. IC Role / Device Role / Timing Role: Secure configuration store with EWEN/EWDS enforcement; accessed during boot and therapy mode transitions. Use Value: Hardware write-protection (EWDS default on power-up) satisfies IEC 62304 SW safety requirement; RoHS/Pb-free compliance meets global regulatory mandates. |
Use Scenario: Storing tariff schedules, CT/PT ratios, and communication keys in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory co-located with metrology SoC; updated quarterly via secure OTA channel. Use Value: 5.5 V max VCC tolerates transient surges on meter power rails; 6 ms write time enables fast key rotation without interrupting metering accuracy. |
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/SN | Same 128 × 16-bit organization and electrical specs; differs only in SOIC package marking code (SN vs ST) and reel packaging-identical pinout and footprint. | No functional difference; SN variant used in tape-and-reel for high-volume SMT; ST used in tube for prototyping or low-volume builds. | Select 93LC56BT-I/SN for automated production; 93LC56B/ST remains optimal for engineering validation and small-batch manufacturing. |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit × 8-bit organization, 1.8–5.5 V VCC, 5 ms write time; lacks Ready/Busy pin-requires fixed delay or status register polling. | Requires additional MCU GPIO for CS and dedicated SPI peripheral; incompatible pinout and protocol-PCB redesign needed. | Choose only if existing design already uses SPI peripherals and 8-bit word alignment; not drop-in for 93LC56B/ST due to interface and timing architecture mismatch. |
Compared with 93LC56BT-I/SN, the 93LC56B/ST offers identical functionality with tube packaging convenience; versus AT25020B-SSHL-T, it provides hardware-ready signaling and Microwire simplicity but requires dedicated 3-wire controller support.
Availability
93LC56B/ST is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor calibration storage, medical infusion pump settings, and smart energy meter firmware parameters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93LC56B/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 93LC56B/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal MCU resource usage and robust data integrity.
FAQ
What is the memory organization of the 93LC56B/ST?
The 93LC56B/ST has a fixed 128 × 16-bit organization-128 words of 16 bits each-totaling 2,048 bits. Unlike C-versions, it has no ORG pin; the 'B' suffix denotes dedicated 16-bit operation. This eliminates external configuration logic and ensures deterministic word-width behavior in firmware drivers for the 93LC56B/ST.
Does the 93LC56B/ST require an external pull-up resistor on the DO pin?
No, the 93LC56B/ST does not require an external pull-up on DO. The DO pin actively drives high/low during read and Ready/Busy status reporting, and enters High-Z when deselected (CS low) or idle. A series resistor (e.g., 10 kΩ) is recommended only if DI and DO are shorted on-board to prevent bus conflict during the read dummy-zero phase-not for pull-up functionality.
What is the minimum VCC required for reliable write operation of the 93LC56B/ST?
The 93LC56B/ST requires VCC ≥2.5 V for all operations, including write. Its internal power-on reset (POR) circuit inhibits writes below ~1.5 V, but successful erase/write execution mandates the full 2.5–5.5 V range per datasheet specification. Operating at 2.5 V yields 2 MHz max clock frequency and higher write current (2 µA typical ICC write), confirmed in Table 1-2 AC Characteristics.
Can the 93LC56B/ST be used in automotive applications requiring AEC-Q200 qualification?
Yes-the 93LC56B/ST is rated for Automotive temperature range (–40°C to +125°C) and carries the 'E' grade designation in its full part number (e.g., 93LC56BE/ST). While AEC-Q200 is a passive component stress test standard and not directly applied to EEPROMs, Microchip qualifies this device to automotive-grade reliability and thermal cycling performance, making it suitable for under-hood and dashboard modules where the 93LC56B/ST meets functional safety requirements.
How does the EWEN/EWDS sequence protect against accidental writes in the 93LC56B/ST?
The 93LC56B/ST powers up in Erase/Write Disable (EWDS) state. Before any ERASE or WRITE instruction executes, an explicit EWEN command must be issued. After programming, issuing EWDS relocks the memory. This two-step hardware-enforced protocol prevents spurious writes from noise, reset glitches, or uninitialized MCU pins-ensuring data integrity in safety-critical applications using the 93LC56B/ST.
93LC56B/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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC56B/ST FAQ
1.How can I place an order for 93LC56B/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56B/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/ST reliable?
The price and inventory of 93LC56B/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/ST is usually 5 days.
3.What payment methods are accepted for 93LC56B/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56B/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56B/ST?
93LC56B/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56B/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/ST?
For technical support, including 93LC56B/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56B/ST requirements.
6.How does Aetrix verify that 93LC56B/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56B/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/ST meets industry standards.
7.What is the process for return or replacement of 93LC56B/ST?
All 93LC56B/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56B/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/ST part is unused and in its original packaging.
Return procedure for 93LC56B/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56B/ST Tags
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M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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