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Microchip Technology 93LC56AT-I/MC
- Part No.:
- 93LC56AT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93LC56AT-I/MC.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,910
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Product details
Overview
93LC56AT-I/MC from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, rated for Industrial temperature range (−40°C to +85°C), and housed in an 8-lead 2×3 DFN package (MC). It supports self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93LC56AT-I/MC datasheet, 93LC56AT-I/MC pinout, 93LC56AT-I/MC application, or 93LC56AT-I/MC equivalent, key selection criteria include VCC range (2.5–5.5 V), 256 × 8-bit organization (no ORG pin), industrial-grade temperature rating, DFN package footprint, and Microwire protocol timing compliance (e.g., TWC = 6 ms, FCLK ≤ 3 MHz at VCC ≥ 4.5 V).
Technical Context
The 93LC56AT-I/MC implements a synchronous 3-wire serial interface (CS/CLK/DI/DO) with start-bit detection and opcode-driven command set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS). It uses internal auto-erase-before-write logic and provides hardware-level power-on/off data protection via VCC voltage detect (VPOR = 1.5 V typical).
Its memory array is organized as 256 words × 8 bits (fixed x8 mode), eliminating ORG pin dependency - unlike C-versions. All programming operations (WRITE, ERASE, WRAL) are self-timed and generate a Ready/Busy signal on DO, requiring CS high ≥250 ns after TCSL to poll status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit); fixed x8 organization - no ORG pin required, simplifying PCB layout and firmware address handling. |
| VCC operating range | 2.5 V to 5.5 V; supports direct interface with 3.3 V and 5 V microcontrollers without level shifting. |
| Endurance | 1,000,000 erase/write cycles; ensures long-term reliability in field-updatable systems like metering or sensor calibration. |
| Data retention | Greater than 200 years at 25°C; suitable for lifetime nonvolatile storage in unattended equipment. |
| Write cycle time | 6 ms typical (TWC); enables predictable timing budgeting for firmware write routines and timeout handling. |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V; balances speed and noise immunity for robust operation in noisy industrial environments. |
| Interface standard | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); interoperable with legacy PIC® MCU peripherals and widely supported drivers. |
Pinout & Package
Package: 8-lead 2×3 mm DFN (exposed pad, MC suffix), RoHS-compliant matte tin finish, thermal pad recommended to be connected to VSS for improved heat dissipation and EMI performance.
| 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) but allows ongoing write completion. |
| 2 - CLK | Serial Clock | Rising-edge synchronized I/O; supports stop/resume during transmission; no clock required during self-timed write cycle. |
| 3 - DI | Data Input | Accepts start bit, opcodes, addresses, and write data; tolerant of bus conflict if shared with DO (requires series resistor per datasheet Figure 2-2). |
| 4 - 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. |
| 5 - NC | No Connect | Internally unconnected; must be left floating or tied to VSS/ VCC per board design rules - no functional impact. |
| 6 - ORG | Organization Select | Not applicable (NC on A/B versions); permanently disabled - device operates exclusively in 256 × 8-bit mode. |
| 7 - VSS | Ground | Reference for all I/O and internal circuitry; exposed pad (Pin 8) should be soldered to VSS plane for thermal and electrical integrity. |
| 8 - VCC | Power Supply | Supplies core and I/O; includes internal POR circuit (VPOR = 1.5 V) that inhibits all operations below threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - firmware only waits for DO high or uses fixed 6 ms timeout, reducing CPU overhead. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial writes and data corruption without software intervention. |
| Power-on/off data protection | Hardware lockout below VPOR (1.5 V) prevents inadvertent writes during brown-out or power ramp - no external supervisor IC needed. |
| Ready/Busy status on DO | Enables polling-based write confirmation without dedicated interrupt line; supports multi-drop bus sharing with proper tri-state management. |
| Pb-free & RoHS compliant | Meets global environmental regulations; matte tin finish ensures reliable solderability and eliminates lead-related reliability concerns. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-calibrated ADC offset/gain coefficients and user-adjusted trim values in smart temperature/humidity sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and field update; x8 interface aligns with byte-oriented MCU firmware. Use Value: Enables recalibration without firmware reflash; 200-year retention ensures accuracy over product lifetime without battery backup. | Use Scenario: Retaining user preferences (e.g., cooking modes, timer settings) and error logs across power cycles in microwave ovens and washing machines. IC Role / Device Role / Timing Role: Low-pin-count, low-power memory co-located with main MCU; 2.5–5.5 V range matches appliance SMPS output rails. Use Value: Eliminates need for higher-cost FRAM or battery-backed SRAM; 1M endurance supports daily usage over 10+ years. |
| Medical Device Parameter Storage | Automotive Body Control Module (BCM) |
Use Scenario: Saving patient-specific therapy parameters and usage history in portable infusion pumps and glucose meters. IC Role / Device Role / Timing Role: Safety-critical data store with deterministic write timing (6 ms max); industrial temp rating covers clinical ambient conditions. Use Value: Meets IEC 62304 traceability requirements; hardware write protection (EWDS/EWEN) prevents accidental overwrite during diagnostics. | Use Scenario: Holding door lock actuator calibration, seat position presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: Secondary memory interfaced to 8-bit/16-bit automotive MCUs; operates across full industrial range (−40°C to +85°C). Use Value: Qualified for automotive use without derating; DFN package saves space vs. SOIC in dense BCM layouts. |
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/MC | 128 × 16-bit organization; same VCC range, package, and timing - requires firmware word-addressing changes. | Used where 16-bit MCU peripherals or packed data structures dominate; not drop-in compatible due to different memory map. | Select only if system architecture benefits from 16-bit access granularity and firmware can accommodate address shift. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, same endurance/retention; no ORG pin, but different command set and status reporting. | Requires SPI peripheral instead of Microwire; supports faster clock (20 MHz) but adds CS/hold/WP pins - increases GPIO count. | Choose when migrating to SPI-based platforms or needing higher throughput; not pin- or protocol-compatible with 93LC56AT-I/MC. |
Compared with 93LC56BT-I/MC and AT25020B-MAHL-T, the 93LC56AT-I/MC offers optimal balance of minimal pin count (3-wire), deterministic 6 ms write timing, and seamless integration with legacy Microwire-capable MCUs - making it preferred for cost-sensitive, space-constrained industrial designs where interface simplicity is critical.
Availability
93LC56AT-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and medical device parameter storage requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56AT-I/MC 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, serving industrial, automotive, and consumer markets globally.
The 93LC56A/B/C family was designed specifically for low-power, pin-efficient nonvolatile memory in resource-constrained embedded systems - emphasizing Microwire compatibility, wide VCC range, and robust data integrity features.
FAQ
What is the memory organization of the 93LC56AT-I/MC?
The 93LC56AT-I/MC has a fixed 256 × 8-bit (2 Kbit) organization. It belongs to the 'A' version of the 93LC56 family and does not include an ORG pin - meaning it operates exclusively in x8 mode, with no hardware or software option to switch to x16. This simplifies address decoding and firmware implementation compared to C-versions.
Does the 93LC56AT-I/MC require an external pull-up resistor on the DO pin?
No, the 93LC56AT-I/MC does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy polling, and enters High-Z when inactive. However, if DI and DO are shorted (shared bus), a current-limiting resistor (e.g., 10 kΩ) is recommended between them to prevent bus conflict during the dummy zero phase of READ, as specified in DS21794G Section 2.2.
What is the maximum clock frequency supported by the 93LC56AT-I/MC at 3.3 V?
At VCC = 3.3 V, the 93LC56AT-I/MC supports a maximum clock frequency of 2 MHz, as defined in Table 1-2 (A1, FCLK) of DS21794G. This is lower than the 3 MHz limit at VCC ≥ 4.5 V, reflecting voltage-dependent timing margins. Firmware must respect this limit to ensure reliable opcode/address/data sampling.
How is write protection implemented on the 93LC56AT-I/MC?
Write protection on the 93LC56AT-I/MC is implemented via the EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) commands. The device powers up in EWDS mode - all erase/write operations are inhibited until EWEN is issued. After any write, executing EWDS restores protection. This two-command scheme prevents accidental overwrites without requiring external hardware locks.
Is the exposed pad on the 93LC56AT-I/MC's DFN package electrically connected?
Yes, the exposed pad (Pin 8) on the 93LC56AT-I/MC's 8-lead 2×3 DFN package is internally connected to VSS. Microchip's packaging specification (DS21794G page 25) states it "may be connected to VSS or left floating," but best practice is to solder it to the PCB's VSS plane to improve thermal dissipation, reduce ground impedance, and enhance EMI performance - especially in industrial noise environments.
93LC56AT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- 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-DFN (2x3)
93LC56AT-I/MC FAQ
1.How can I place an order for 93LC56AT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT-I/MC 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 93LC56AT-I/MC reliable?
The price and inventory of 93LC56AT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56AT-I/MC is usually 5 days.
3.What payment methods are accepted for 93LC56AT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT-I/MC?
93LC56AT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT-I/MC 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 93LC56AT-I/MC?
For technical support, including 93LC56AT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT-I/MC requirements.
6.How does Aetrix verify that 93LC56AT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93LC56AT-I/MC 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 93LC56AT-I/MC meets industry standards.
7.What is the process for return or replacement of 93LC56AT-I/MC?
All 93LC56AT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT-I/MC, 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 93LC56AT-I/MC part is unused and in its original packaging.
Return procedure for 93LC56AT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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