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Microchip Technology 93LC56AT/ST
- Part No.:
- 93LC56AT/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56AT/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,484
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Product details
Overview
93LC56AT/ST from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial temperature grade (−40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status via DO pin - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93LC56AT/ST datasheet, 93LC56AT/ST pinout, 93LC56AT/ST application, or 93LC56AT/ST equivalent, key selection considerations include its fixed 8-bit organization (no ORG pin), TSSOP-8 package (ST), 1 million erase/write endurance, 200-year data retention, and compatibility with microcontroller SPI-like serial masters requiring minimal I/O resources.
Technical Context
This device implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS), and internal auto-erase-before-write logic. Communication uses CS, CLK, DI, and DO signals with strict timing constraints (e.g., TCSL ≥ 250 ns, TPD ≤ 400 ns at 1.8 V).
It operates in Standby mode when CS is low, transitions to active on CS high + Start bit, and provides Ready/Busy polling via DO during programming. The absence of ORG pin confirms fixed x8 organization, eliminating external configuration logic required by 'C' variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - supports up to 256 bytes of nonvolatile configuration or calibration data |
| 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 | 3-wire Microwire-compatible serial (CS, CLK, DI/DO) - reduces MCU pin count vs. parallel EEPROM |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent field-updatable parameter storage |
| Data retention | >200 years at 25°C - ensures long-term reliability in unattended industrial equipment |
| Temp range | −40°C to +85°C (Industrial) - validated for operation in extended ambient environments |
| Write cycle time | 6 ms typical (TWC) - enables predictable firmware timeout handling during write operations |
Pinout & Package
93LC56AT/ST is supplied in an 8-pin TSSOP package (ST suffix), measuring 3.0 mm × 4.4 mm × 1.2 mm, with Pb-free Matte Tin finish and standard JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby entry/exit |
| 2 CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data |
| 3 DI | Data Input | Receives Start bit, instruction opcodes, memory addresses, and write data |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low |
| 5 VSS | Ground | Reference return path for all digital and power circuitry; requires low-impedance PCB connection |
| 6 NC | No Connection | Internally unconnected; must remain floating or tied to VSS per layout best practice |
| 7 ORG/NC | Organization Select / No Connect | NC on A/B versions - confirms fixed 8-bit organization; no external pull-up/down required |
| 8 VCC | Power Supply | 2.5–5.5 V supply input; includes internal POR circuitry triggering at ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or firmware delay loops - simplifies driver implementation |
| Automatic ERAL before WRAL | Ensures full array readiness prior to bulk write, preventing partial writes or data corruption |
| Power-on/off data protection | Hardware-level lockout below VCC threshold (~1.5 V) prevents inadvertent writes during brownout |
| Ready/Busy status via DO | Enables efficient polling-based write completion detection without dedicated interrupt lines |
| Sequential read mode | Allows continuous address incrementing while CS remains high - reduces command overhead for block reads |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Memory |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients in programmable logic controllers and process transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent calibration parameters accessed at boot and during field recalibration. Use Value: Maintains accuracy across power cycles and firmware updates; leverages 200-year retention and 1M-cycle endurance for lifetime recalibration support. |
Use Scenario: Holding user-defined settings (e.g., display brightness, communication baud rate, alarm thresholds) in medical diagnostic devices. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to MCU GPIOs using minimal 3-wire bus. Use Value: Reduces BOM cost and PCB area vs. parallel EEPROM; supports robust field updates without hardware redesign. |
| Automotive Body Control Module (BCM) Parameter Backup | Smart Meter Firmware Configuration |
Use Scenario: Retaining seat/mirror position presets and lighting profiles in automotive BCMs operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM providing reliable parameter backup under thermal stress and EMI. Use Value: Validated industrial temp range and 2.5 V min VCC ensure operation during cold-crank battery dips and engine bay heat exposure. |
Use Scenario: Storing tariff schedules, meter ID, and security keys in utility smart meters deployed for >10-year field life. IC Role / Device Role / Timing Role: Long-life nonvolatile memory supporting secure, infrequent but critical parameter updates over PLC or RF links. Use Value: 200-year data retention and 1M-cycle endurance meet ANSI C12.22 and IEC 62056 compliance requirements for metrology data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B/ST | 128 × 16-bit organization; same VCC range, package, and timing; no ORG pin | Requires 16-bit data path alignment; incompatible with existing 8-bit firmware drivers | Select only if system architecture mandates 16-bit word access and memory map is redefined |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, SOIC-8 package | Different protocol stack (SPI vs. Microwire); requires updated MCU peripheral initialization and command framing | Choose when migrating to SPI-standard peripherals or consolidating with other SPI flash/EEPROM in BOM |
Compared with 93LC56B/ST and AT25020B-SSHL-T, the 93LC56AT/ST offers drop-in compatibility for legacy Microwire-based designs, guaranteed 8-bit data width, and identical TSSOP-8 footprint - minimizing firmware and layout changes during replacement.
Availability
93LC56AT/ST is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration memory, and smart meter firmware configuration requiring stable component supply across multi-year production cycles.
Supply support for 93LC56AT/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 93LC56A/B/C family was designed specifically for low-power, space-constrained embedded systems needing reliable, low-pin-count serial EEPROM with robust data integrity and wide voltage operation.
FAQ
What is the memory organization of the 93LC56AT/ST?
The 93LC56AT/ST 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 - confirming dedicated 8-bit communication without external configuration. This differs from 'B' (128 × 16-bit) and 'C' (pin-selectable) variants.
Does the 93LC56AT/ST require an external pull-up resistor on the DO pin?
No, the 93LC56AT/ST 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-Z when CS is low or during non-read operations. A pull-up may interfere with valid low-state signaling during busy indication.
What is the minimum VCC required for reliable write operation of the 93LC56AT/ST?
The 93LC56AT/ST requires VCC ≥ 2.5 V for all operations, including write. Its internal power-on reset (POR) circuit activates at ~1.5 V, but write functionality is only guaranteed within the specified 2.5–5.5 V range. Operation below 2.5 V disables erase/write commands and may corrupt data.
Can the 93LC56AT/ST be used with a standard SPI master peripheral?
While electrically compatible (3-wire, clocked serial), the 93LC56AT/ST uses Microwire protocol - not SPI. It requires start-bit detection and specific 9-bit opcodes (e.g., 10b for READ), differing from SPI's continuous shift-register behavior. Dedicated firmware or bit-banged GPIO control is needed; standard SPI hardware peripherals cannot drive it without protocol translation.
Is the 93LC56AT/ST RoHS compliant and lead-free?
Yes, the 93LC56AT/ST is Pb-free and RoHS compliant, with a Matte Tin (Sn) finish on its TSSOP-8 package terminals. This meets EU Directive 2011/65/EU and is confirmed in Microchip's DS21794G datasheet revision history and packaging specifications.
93LC56AT/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:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC56AT/ST FAQ
1.How can I place an order for 93LC56AT/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT/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/ST reliable?
The price and inventory of 93LC56AT/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/ST is usually 5 days.
3.What payment methods are accepted for 93LC56AT/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT/ST?
93LC56AT/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT/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/ST?
For technical support, including 93LC56AT/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT/ST requirements.
6.How does Aetrix verify that 93LC56AT/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56AT/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/ST meets industry standards.
7.What is the process for return or replacement of 93LC56AT/ST?
All 93LC56AT/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT/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/ST part is unused and in its original packaging.
Return procedure for 93LC56AT/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56AT/ST Tags
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