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Microchip Technology 93LC56AT-I/MS
- Part No.:
- 93LC56AT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC56AT-I/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,396
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Product details
Overview
93LC56AT-I/MS from Microchip Technology Inc. is a 2 Kbit (256 × 8-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 MSOP package. It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status signaling via DO pin - deployed in microcontroller configuration storage, sensor calibration data retention, and power-management parameter backup.
For engineers reviewing the 93LC56AT-I/MS datasheet, 93LC56AT-I/MS pinout, 93LC56AT-I/MS application, or 93LC56AT-I/MS equivalent, key selection criteria include its 256 × 8-bit fixed organization (no ORG pin), 6 ms typical write cycle time, 1 million endurance cycles, 200-year data retention, and compatibility with legacy Microwire-based host controllers requiring minimal I/O resource allocation.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO signals with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all clocked on rising CLK edges, with DO providing either data output or Ready/Busy status depending on CS timing and instruction phase.
Internal logic includes address decoding, mode control, and auto-erase-before-write functionality. Power-on reset circuitry inhibits operations below 1.5 V, and the device powers up in EWDS (Erase/Write Disable) state, requiring explicit EWEN before programming - ensuring robust immunity against inadvertent writes during power transients or noise events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit organization; fixed, no ORG pin) |
| VCC range | 2.5 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting |
| Write cycle time | 6 ms typical - defines minimum interval between successive WRITE or ERASE commands |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in calibration or logging applications |
| Data retention | 200 years at 25°C - ensures long-term reliability in unpowered storage of critical configuration data |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - reduces MCU GPIO usage and simplifies PCB routing |
| Temp range | –40°C to +85°C (Industrial grade) - validated for operation in industrial control panels and automotive body electronics |
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 located at top-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but allows ongoing write completion |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable at any point without corruption |
| DI | Data Input | Receives start bit, instruction opcodes, memory addresses, and write data; shares net with DO only if external current-limiting resistor applied |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters high-impedance state on CS falling edge; requires CS high ≥250 ns to sample status |
| VSS | Ground | Reference for all digital and analog functions; exposed pad may be connected to VSS for improved thermal performance |
| NC | No Connect | Pin 7 is internally unconnected - must be left floating or tied to VSS per layout best practice; not usable as strap or debug pin |
| VCC | Power Supply | Supplies core logic and memory array; internal POR circuit disables operations below 1.5 V to prevent partial writes |
| ORG | Organization Select | Not present on 93LC56A variants - this pin is NC (no internal connection); 93LC56AT-I/MS is fixed 8-bit mode only |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control or polling delays beyond TWC (6 ms), simplifying firmware implementation |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial overwrites and eliminates separate erase step in initialization routines |
| Power-on/off data protection | Hardware-level VCC monitoring blocks all write operations below 1.5 V, preventing corruption during brown-out or hot-plug scenarios |
| Ready/Busy status via DO | Enables non-blocking polling - host can execute other tasks while checking DO high/low instead of fixed delay loops |
| Sequential read mode | Allows continuous address increment with CS held high, reducing instruction overhead for multi-byte reads (e.g., firmware version strings) |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during system boot and runtime recalibration; interfaces via Microwire to ARM Cortex-M0+ MCU. Use Value: Enables field-upgradable calibration without reprogramming flash; 200-year retention ensures accuracy across product lifetime without battery backup. |
Use Scenario: Holding user-defined settings (display brightness, network IP, alarm thresholds) in medical infusion pumps. IC Role / Device Role / Timing Role: Dedicated configuration memory decoupled from main MCU flash; accessed asynchronously during UI navigation or power-up sequence. Use Value: Isolates volatile UI state from firmware updates; 1M endurance supports daily parameter changes over 10+ years of clinical use. |
| Automotive Body Control Module | Consumer Appliance Settings Storage |
Use Scenario: Retaining seat/mirror position memory and door lock preferences in 12 V automotive BCMs. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to 5 V tolerant CAN microcontroller; powered directly from vehicle battery via LDO. Use Value: Operates reliably across –40°C to +85°C ambient; 2.5 V min VCC supports cold-cranking voltage dips without data loss. |
Use Scenario: Saving cooking program history and child-lock status in smart ovens with touch UI. IC Role / Device Role / Timing Role: Standalone memory for persistent state between AC power cycles; accessed via GPIO-bit-banged Microwire protocol. Use Value: MSOP package enables compact placement near MCU; 3-wire interface minimizes BOM count versus I²C alternatives requiring pull-ups. |
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/MS | 128 × 16-bit organization; same VCC range, temp grade, and package; requires 16-bit data framing | Used where MCU native word size is 16-bit or where memory density efficiency favors wider words | Select if system firmware already handles 16-bit addressing and avoids byte-swapping overhead |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, same endurance/retention, SOIC-8/MSOP-8 | Requires SPI-capable MCU peripheral; incompatible command set and timing; no Ready/Busy pin | Choose when migrating to SPI-based platforms or consolidating supply chain around Atmel/Advantra portfolio |
Compared with 93LC56B-I/MS, the 93LC56AT-I/MS offers simpler 8-bit data handling and eliminates ORG pin management; versus AT25020B-MAHL-T, it retains Microwire compatibility and hardware Ready/Busy signaling - critical for deterministic timing in resource-constrained hosts.
Availability
93LC56AT-I/MS is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device design requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56AT-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56A/B/C series was designed specifically for cost-sensitive, low-power embedded systems needing reliable, pin-efficient serial EEPROM - emphasizing Microwire compatibility, wide VCC tolerance, and robust data integrity under voltage fluctuation.
FAQ
What is the memory organization of the 93LC56AT-I/MS?
The 93LC56AT-I/MS has a fixed 256 × 8-bit organization - meaning 256 addressable bytes, each 8 bits wide. Unlike 'C' variants, it lacks an ORG pin and does not support 16-bit mode. This simplifies hardware design by eliminating external configuration strapping and ensures consistent byte-aligned access in firmware.
Does the 93LC56AT-I/MS require an external pull-up resistor on the DO line?
No, the 93LC56AT-I/MS does not require an external pull-up on DO. The DO pin actively drives high/low during READ or Ready/Busy status reporting and enters high-impedance when inactive. However, if DI and DO are shorted (shared bus), a current-limiting resistor (e.g., 10 kΩ) is required to prevent bus conflict during dummy-zero read phases.
What is the minimum VCC required for reliable write operation of the 93LC56AT-I/MS?
The 93LC56AT-I/MS requires VCC ≥ 2.5 V for all operations, but reliable WRITE and ERASE cycles demand VCC ≥ 4.5 V for ERAL and WRAL commands. For standard single-address WRITE, VCC ≥ 2.5 V is sufficient; however, the internal power-on reset circuit blocks all programming below 1.5 V to prevent partial writes.
How does the Ready/Busy status work on the 93LC56AT-I/MS?
During WRITE or ERASE, the DO pin outputs Ready/Busy status: low = busy, high = ready. To sample it, CS must be brought high for ≥250 ns after the initial CS low pulse - then read DO on the next CLK rising edge. After completion, issuing a Start bit followed by CS low clears the status flag and returns DO to high-Z.
Is the 93LC56AT-I/MS compatible with modern 3.3 V microcontrollers?
Yes, the 93LC56AT-I/MS operates fully within 2.5 V to 5.5 V, making it directly compatible with 3.3 V MCUs. Its VIH1 threshold is 2.0 V (min) at VCC ≥ 2.7 V, and VOL1 is ≤ 0.4 V at IOL = 2.1 mA - satisfying standard 3.3 V CMOS logic levels without level shifters. All timing parameters are specified down to 2.5 V.
93LC56AT-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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-MSOP
93LC56AT-I/MS FAQ
1.How can I place an order for 93LC56AT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT-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 93LC56AT-I/MS reliable?
The price and inventory of 93LC56AT-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 93LC56AT-I/MS is usually 5 days.
3.What payment methods are accepted for 93LC56AT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT-I/MS?
93LC56AT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT-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 93LC56AT-I/MS?
For technical support, including 93LC56AT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT-I/MS requirements.
6.How does Aetrix verify that 93LC56AT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93LC56AT-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 93LC56AT-I/MS meets industry standards.
7.What is the process for return or replacement of 93LC56AT-I/MS?
All 93LC56AT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT-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 93LC56AT-I/MS part is unused and in its original packaging.
Return procedure for 93LC56AT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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