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Microchip Technology 93LC56B-I/MS
- Part No.:
- 93LC56B-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC56B-I/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,068
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Product details
Overview
93LC56B-I/MS 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 (−40°C to +85°C), and housed in an 8-lead MSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status signaling via DO pin, and 1 million erase/write endurance.
For engineers reviewing the 93LC56B-I/MS datasheet, 93LC56B-I/MS pinout, 93LC56B-I/MS application, or 93LC56B-I/MS equivalent, this page delivers verified electrical specs, functional timing behavior, memory organization details, real-world use cases in embedded control and sensor calibration, and validated alternative parts for design continuity.
Technical Context
The 93LC56B-I/MS implements a fixed 128 × 16-bit memory array with no ORG pin-dedicated x16 operation eliminates external configuration logic. Communication uses synchronous 3-wire Microwire protocol: CS enables device selection, CLK synchronizes bit transfers on rising edges, and DI/DO handle serial data I/O with high-impedance tri-state output during non-read states.
It supports full instruction set including READ (20-clock cycle), WRITE (20-clock), ERASE (12-clock), ERAL (12-clock), EWEN/EWDS for write protection, and WRAL (20-clock) with built-in auto-ERAL. All programming cycles are self-timed (TWC = 6 ms typical), and Ready/Busy status is polled via DO pin after minimum TCSL (250 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (128 words × 16 bits); provides compact nonvolatile storage for calibration data or firmware flags without external address decoding. |
| VCC Range | 2.5 V to 5.5 V; compatible with 3.3 V and 5 V systems, enabling direct integration into mixed-voltage microcontroller interfaces. |
| Clock Frequency | Up to 2 MHz at VCC = 2.5 V; ensures reliable timing margin in low-power embedded hosts without requiring high-speed clock sources. |
| Write Cycle Time | 6 ms typical (TWC); deterministic self-timed erase/write eliminates need for host software timeout tuning or busy-wait polling overhead. |
| Endurance | 1,000,000 erase/write cycles; supports frequent field updates in telemetry loggers or adaptive control systems over product lifetime. |
| Data Retention | 200 years at 25°C; guarantees long-term integrity of stored configuration or security keys without refresh mechanisms. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO); reduces PCB routing complexity and GPIO count versus SPI or I²C solutions. |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot; pin 1 corner located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: must be held ≥250 ns low between instructions; falling edge initiates self-timed write/erase on 93LC devices. |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clock required during self-timed programming phase. |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; tied to DO only with series resistor to prevent bus conflict during dummy-zero read phase. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires CS high ≥250 ns to sample status. |
| VSS | Ground | Reference for all digital and analog circuitry; exposed pad may be connected to VSS for improved thermal performance. |
| NC | No Connection | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice-no functional role. |
| VCC | Power Supply | Supplies core logic and memory array; internal POR triggers at ~1.5 V; voltage detect ensures data protection below safe operating threshold. |
| Pin 8 | VCC | Primary power input; decoupling capacitor (0.1 µF) required within 5 mm for stable operation across full VCC range. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates host timing dependency: 6 ms typical cycle completes autonomously after CS fall, freeing MCU resources. |
| Automatic ERAL before WRAL | Ensures full-array write reliability without separate erase command-WRAL executes ERAL + program atomically. |
| Power-On/Off Data Protection | Hardware POR circuit disables writes below 1.5 V, preventing corruption during brown-out or hot-plug events. |
| Ready/Busy Status via DO | Enables efficient polling instead of fixed delays: DO = low during active programming, high when ready for next command. |
| 128 × 16-bit Fixed Organization | Optimizes data throughput for 16-bit microcontrollers: each READ/WRITE transfers one native word, reducing transaction count. |
| Pb-free & RoHS Compliant | Meets global environmental compliance requirements; matte tin finish ensures solderability and long-term shelf life. |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in smart pressure sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at boot and during field recalibration; x16 interface aligns with 16-bit sensor DSP core. Use Value: Enables single-cycle read of full 16-bit calibration word; 200-year retention ensures accuracy over equipment service life without battery backup. |
Use Scenario: Holding user-defined I/O mapping, communication baud rates, and alarm thresholds in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: System configuration register bank; accessed via Microwire from ARM Cortex-M3 host during initialization and runtime reconfiguration. Use Value: 1M endurance supports daily firmware updates and parameter changes; 2.5–5.5 V operation matches PLC's wide-input DC supply rails. |
| Medical Device Settings Storage | Automotive Body Control Module |
Use Scenario: Saving patient-specific therapy parameters and usage logs in portable infusion pumps with battery-backed operation. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory; accessed only during setup or error recovery to minimize energy draw. Use Value: 1 µA standby current (ICCS) extends battery life; industrial temp rating covers clinical ambient conditions without derating. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive door modules. IC Role / Device Role / Timing Role: Parameter EEPROM interfaced to 8-bit MCU via minimal 3-wire bus; survives repeated ignition cycles and thermal cycling. Use Value: Built-in EWEN/EWDS prevents accidental overwrite during ECU reset; 6 ms write time fits within CAN message latency budgets. |
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, industrial temp; packaged in 8-lead SOIC (SN) instead of MSOP (MS). | SOIC offers easier hand-soldering and test probe access; MSOP saves board area in space-constrained modules. | Select 93LC56B-I/SN for prototyping or low-volume assembly; choose 93LC56B-I/MS for production miniaturization. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256×8), 1.8–5.5 V, industrial temp; lacks ERAL/WRAL atomic commands and ORG flexibility. | Requires additional chip select line and different command protocol; no built-in auto-ERAL before WRAL. | Use AT25020B-MAHL-T only if SPI is already standardized in the system; 93LC56B-I/MS retains Microwire simplicity and atomic WRAL. |
Compared with 93LC56B-I/SN, the 93LC56B-I/MS offers identical functionality in a smaller footprint, while AT25020B-MAHL-T introduces SPI protocol overhead and loses the hardware-protected WRAL feature critical for robust field updates.
Availability
93LC56B-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, medical device settings storage, and automotive body control module designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56B-I/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56B-I/MS belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring simple 3-wire nonvolatile storage with guaranteed endurance and data retention.
FAQ
What is the memory organization of the 93LC56B-I/MS?
The 93LC56B-I/MS has a fixed 128 × 16-bit organization-no ORG pin is present, so it operates exclusively in x16 mode. This differs from 'C' variants that require external logic to configure word size. Each READ or WRITE accesses one 16-bit word, making it ideal for 16-bit microcontrollers or applications where aligned word access improves efficiency. The total capacity remains 2 Kbit (2048 bits).
Does the 93LC56B-I/MS require an external pull-up resistor on the DO pin?
No, the 93LC56B-I/MS does not require an external pull-up on DO. Its DO pin is actively driven high or low during READ and Ready/Busy status reporting, and enters high-impedance (High-Z) state otherwise. However, if DI and DO are shorted (common-bus configuration), a series resistor (typically 10 kΩ) is required between them to prevent bus conflict during the dummy-zero phase of READ operations.
How is write protection implemented on the 93LC56B-I/MS?
Write protection on the 93LC56B-I/MS is enforced through the Erase/Write Enable (EWEN) and Erase/Write Disable (EWDS) instructions. The device powers up in EWDS mode-any ERASE or WRITE command will be ignored until EWEN is issued. After programming, executing EWDS restores protection. This hardware-based lock prevents accidental overwrites during power transients or software glitches, independent of VCC level.
What is the maximum clock frequency supported by the 93LC56B-I/MS at 3.3 V?
At VCC = 3.3 V, the 93LC56B-I/MS supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1, FCLK). This applies across the full industrial temperature range (−40°C to +85°C). Operation above 2 MHz is not guaranteed and may result in timing violations, especially during READ or WRITE sequences where setup/hold margins tighten at lower supply voltages.
Can the 93LC56B-I/MS be used in automotive applications requiring AEC-Q200 qualification?
No, the 93LC56B-I/MS is rated for industrial temperature (−40°C to +85°C) and is not AEC-Q200 qualified. For automotive applications, Microchip offers the 93LC56B-E/MS variant, which is qualified to AEC-Q200 Grade 2 (−40°C to +105°C) and undergoes additional stress testing. Using the -I version in under-hood environments risks parametric drift or premature failure outside its validated operating envelope.
93LC56B-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not 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-MSOP
93LC56B-I/MS FAQ
1.How can I place an order for 93LC56B-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56B-I/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 93LC56B-I/MS reliable?
The price and inventory of 93LC56B-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56B-I/MS is usually 5 days.
3.What payment methods are accepted for 93LC56B-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56B-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56B-I/MS?
93LC56B-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56B-I/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 93LC56B-I/MS?
For technical support, including 93LC56B-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56B-I/MS requirements.
6.How does Aetrix verify that 93LC56B-I/MS is sourced from the original manufacturer or authorized distributors?
All 93LC56B-I/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 93LC56B-I/MS meets industry standards.
7.What is the process for return or replacement of 93LC56B-I/MS?
All 93LC56B-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56B-I/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 93LC56B-I/MS part is unused and in its original packaging.
Return procedure for 93LC56B-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56B-I/MS Tags
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AT24C02C-XHM-T
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