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Microchip Technology 93LC56AT-I/ST
- Part No.:
- 93LC56AT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56AT-I/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
93LC56AT-I/ST from Microchip Technology is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, industrial temperature grade (–40°C to +85°C), and TSSOP-8 package. It provides nonvolatile storage for configuration data in microcontroller-based systems requiring reliable, low-power memory with automatic erase-before-write and hardware data protection.
For engineers reviewing the 93LC56AT-I/ST datasheet, 93LC56AT-I/ST pinout, 93LC56AT-I/ST application, or 93LC56AT-I/ST equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), 1 million erase/write cycles, 200-year data retention, Ready/Busy status signaling via DO, and compatibility with legacy Microwire controllers in space-constrained industrial designs.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO lines with start-bit detection and opcode-driven command execution. It supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all self-timed with internal auto-erase before write. The absence of an ORG pin confirms fixed 8-bit word organization, eliminating external configuration logic.
Power-on/off data protection is enforced by internal voltage detection (VPOR = 1.5 V typical), and programming is disabled at power-up until EWEN is issued. Standby current is ≤1 µA (I-temp), and the DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during erase/write operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit); fixed x8 organization without ORG pin - simplifies interface wiring and eliminates configuration overhead. |
| VCC range | 2.5 V to 5.5 V; supports direct connection to 3.3 V or 5 V logic rails without level shifting. |
| Endurance | 1,000,000 erase/write cycles; enables long-term field calibration or firmware parameter logging in industrial equipment. |
| Data retention | >200 years at 25°C; ensures configuration integrity across product lifecycle without refresh. |
| Write cycle time | 6 ms typical (TWC); deterministic timing allows precise host software timeout management. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); interoperable with legacy PIC® MCU peripherals and minimal GPIO usage. |
| Temp grade | Industrial (–40°C to +85°C); qualified for deployment in factory automation, metering, and embedded control environments. |
| Package | TSSOP-8 (ST); 4.4 mm × 3.0 mm footprint with gull-wing leads - suitable for automated SMT assembly and moderate-density PCBs. |
Pinout & Package
TSSOP-8 package (ST suffix), Pb-free Matte Tin finish, 0.65 mm lead pitch, 1.1 mm max height. Pin 1 marked by laser dot; pin 1 corner located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between commands; deselects device into standby (≤1 µA ICCS). |
| 2 (CLK) | Serial Clock | Positive-edge synchronized; supports up to 3 MHz (VCC ≥4.5 V); clock may pause mid-transfer without error. |
| 3 (DI) | Data Input | Accepts start bit, opcodes, addresses, and write data; high-impedance when CS low. |
| 4 (DO) | Data Output / Status | Outputs read data on rising CLK edge; indicates Ready (high) or Busy (low) during erase/write when CS reasserted. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; requires low-impedance connection to system ground plane. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating - no external tie required or recommended. |
| 7 (ORG) | Organization | No internal connection on 93LC56A variants; pin is NC - not used and must be left unconnected. |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; internal POR circuit (1.5 V threshold) blocks writes until stable supply is detected. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host only waits for DO high or polls status, reducing firmware complexity. |
| Automatic ERAL before WRAL | WRAL instruction includes full-array erase prior to write, ensuring consistent data initialization without separate ERAL command. |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC prevents corruption during brown-out or power ramp-up/down sequences. |
| EWEN/EWDS security | Explicit enable/disable commands prevent accidental writes; device powers up in EWDS state - intentional write requires deliberate EWEN first. |
| Sequential read mode | Holding CS high after READ allows automatic address increment and continuous data streaming - ideal for loading configuration blocks. |
| Industry-standard Microwire interface | Direct drop-in replacement for legacy 93Cxx/93AAxx devices; no protocol translation or driver modification needed. |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing sensor offset/gain coefficients and linearization tables in factory-calibrated pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at boot and during field recalibration; uses sequential READ and single-address WRITE. Use Value: Enables traceable, field-updatable calibration without requiring external MCU flash or battery-backed RAM. | Use Scenario: Holding boot-time configuration (baud rate, I/O mapping, safety thresholds) for PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: System configuration memory initialized once per power cycle; accessed via Microwire peripheral on PIC18 or dsPIC33. Use Value: Reduces BOM count by replacing discrete configuration jumpers or DIP switches with programmable settings. |
| Smart Meter Firmware Parameters | Medical Device Settings Storage |
Use Scenario: Retaining tariff schedules, pulse constants, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, long-life data archive with write-protection via EWDS; endurance supports daily log updates over 10+ years. Use Value: Meets ANSI/IEC data retention and reliability requirements without adding FRAM or backup capacitors. | Use Scenario: Saving user-adjustable therapy parameters (flow rate, duration, alarm limits) in portable infusion pumps and ventilators. IC Role / Device Role / Timing Role: Safety-critical configuration store with hardware write-protection; powered from main rail with POR guard. Use Value: Ensures parameter persistence through battery swaps and power interruptions while meeting IEC 62304 Class B software requirements. |
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/ST | 128 × 16-bit organization; same VCC/temp/package but requires 16-bit data framing and different address width. | Not drop-in compatible - firmware must shift from byte-oriented to word-oriented access and handle 7-bit addressing. | Select only if system architecture mandates 16-bit data path and memory bandwidth optimization justifies code changes. |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, same endurance/retention, SOIC-8 package. | Requires SPI master instead of Microwire; pinout incompatible (no ORG/NC pins); different command set and status reporting. | Choose when migrating to SPI-based platforms or consolidating with other SPI peripherals - not for Microwire legacy replacement. |
Compared with 93LC56BT-I/ST, the 93LC56AT-I/ST avoids 16-bit alignment overhead and simplifies firmware; versus AT25020B-SSHL-T, it preserves existing Microwire controller investment and eliminates interface translation layers - critical for cost-sensitive industrial upgrades.
Availability
93LC56AT-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and smart meter firmware parameter storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56AT-I/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 93LCxx series was designed specifically for low-power, cost-sensitive embedded systems needing simple, robust serial EEPROM with Microwire compatibility and hardware data protection - targeting industrial, automotive, and consumer control applications.
FAQ
What is the memory organization of the 93LC56AT-I/ST?
The 93LC56AT-I/ST has a fixed 256 × 8-bit (2 Kbit) organization. As an "A" variant, it lacks an ORG pin and operates exclusively in x8 mode - no external configuration is required or supported. This differs from "C" variants that use the ORG pin to select between x8 and x16 modes.
Does the 93LC56AT-I/ST require an external pull-up resistor on the DO pin?
No, the 93LC56AT-I/ST does not require an external pull-up on DO. During READ, DO actively drives high/low; during READY/BUSSY polling, it outputs valid logic levels. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict when A0 = high during dummy-zero phase.
How is write protection implemented on the 93LC56AT-I/ST?
Write protection on the 93LC56AT-I/ST is implemented via hardware voltage detection (1.5 V POR threshold) and software-controlled EWEN/EWDS commands. The device powers up in EWDS (Erase/Write Disable) state - an explicit EWEN instruction is mandatory before any ERASE or WRITE operation. This prevents accidental writes during power transitions or noise events.
What is the maximum clock frequency supported by the 93LC56AT-I/ST at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC56AT-I/ST supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) for 2.5 V ≤ VCC < 4.5 V. Timing margins (TCKH/TCKL) scale accordingly: min clock high/low times are 250 ns and 200 ns respectively.
Can the 93LC56AT-I/ST be used in automotive applications?
The 93LC56AT-I/ST is rated for Industrial temperature range (–40°C to +85°C), not Automotive (–40°C to +125°C). For automotive use, Microchip specifies the "E" grade variants such as 93LC56AT-E/ST. Using the "I" grade in under-hood or infotainment systems outside its qualified temperature range voids reliability guarantees and may cause data corruption.
93LC56AT-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- 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-TSSOP
93LC56AT-I/ST FAQ
1.How can I place an order for 93LC56AT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT-I/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 93LC56AT-I/ST reliable?
The price and inventory of 93LC56AT-I/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 93LC56AT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT-I/ST?
93LC56AT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT-I/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 93LC56AT-I/ST?
For technical support, including 93LC56AT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT-I/ST requirements.
6.How does Aetrix verify that 93LC56AT-I/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56AT-I/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 93LC56AT-I/ST meets industry standards.
7.What is the process for return or replacement of 93LC56AT-I/ST?
All 93LC56AT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT-I/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 93LC56AT-I/ST part is unused and in its original packaging.
Return procedure for 93LC56AT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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