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Microchip Technology 93LC56AT-I/SN
- Part No.:
- 93LC56AT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56AT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:25,021
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Product details
Overview
The 93LC56AT-I/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating across 2.5–5.5 V, rated for Industrial temperature (−40°C to +85°C), and housed in an 8-lead SOIC package (SN). It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status via DO pin - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC56AT-I/SN datasheet, 93LC56AT-I/SN pinout, 93LC56AT-I/SN application, or 93LC56AT-I/SN equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), 1 million erase/write endurance, 200-year data retention, and compatibility with legacy Microwire controllers requiring minimal I/O overhead.
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 operation phase.
Internal power-on reset and voltage-detect circuitry (VPOR = 1.5 V typical) disable write operations below VCC threshold. The absence of ORG pin confirms fixed 8-bit word organization, eliminating external configuration logic and simplifying host firmware for byte-oriented access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - provides compact nonvolatile storage for calibration data, device IDs, or user settings in space-constrained designs. |
| VCC range | 2.5 V to 5.5 V - compatible with both 3.3 V and 5 V microcontroller I/O domains without level shifting. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates such as logging or parameter tuning in industrial controllers. |
| Data retention | >200 years at 25°C - ensures long-term reliability for products with multi-decade service life expectations. |
| Write cycle time | 6 ms max (TWC) - enables predictable timing budgets for firmware write routines without polling delays exceeding 7 ms. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires only four MCU GPIOs and no additional protocol stack beyond bit-banged SPI-like control. |
| Temp grade | Industrial (−40°C to +85°C) - validated for deployment in factory automation, HVAC, and metering equipment. |
Pinout & Package
Package: 8-lead SOIC (SN), 3.9 mm × 4.9 mm body, 1.27 mm pitch, Pb-free Matte Tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands; controls Standby mode entry and Ready/Busy status availability. |
| 2 CLK | Serial Clock | Synchronizes all data transfers on rising edge; stoppable at any point; no clock required during self-timed write cycles. |
| 3 DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied high with CS and CLK to initiate instruction sequence. |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS is low or after status check completion. |
| 5 VSS | Ground | Reference return path for all internal logic and I/O; must be low-impedance connection to system GND plane. |
| 6 NC | No Connection | Internally unconnected; must remain floating or tied to GND per layout best practice - not used for ORG function (A-version). |
| 7 NC | No Connection | Internally unconnected; matches pinout of C-version but unused in 93LC56A; no routing required. |
| 8 VCC | Power Supply | Supplies core logic and memory array; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control or firmware delay loops - host only waits for DO status or fixed 6 ms timeout. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write, preventing partial writes or data corruption during power loss mid-operation. |
| Power-on/off data protection | Hardware-level VCC monitoring (1.5 V threshold) blocks all write commands during brown-out or power ramp-up, ensuring memory integrity. |
| Ready/Busy status via DO | Enables efficient polling without dedicated status lines - reduces pin count and simplifies interface compared to parallel EEPROMs. |
| Sequential read capability | Allows continuous address incrementing while CS remains high, enabling fast dump of configuration blocks with minimal clock overhead. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Settings |
|---|---|
Use Scenario: Storing factory-trimmed sensor gain/offset coefficients and real-time calibration updates in pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and periodic recalibration; 6 ms write latency fits within maintenance window between measurements. Use Value: Enables field-upgradable calibration without firmware reflash, reducing service cost and supporting NIST-traceable recalibration logs. | Use Scenario: Retaining user preferences (e.g., cooking modes, timer values, display brightness) across power cycles in microwave ovens or washing machines. IC Role / Device Role / Timing Role: Low-pin-count parameter store interfaced directly to 8-bit MCU GPIOs; operates reliably at 3.3 V or 5 V supply. Use Value: Eliminates battery-backed SRAM, lowering BOM cost and avoiding end-of-life battery replacement concerns. |
| Medical Device Configuration | Automotive Body Control Module |
Use Scenario: Holding device-specific operational parameters (e.g., alarm thresholds, language selection, audit trail flags) in portable diagnostic tools. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with hardware write protection (EWDS/EWEN); withstands −40°C to +85°C ambient. Use Value: Meets IEC 62304 Class B software safety requirements by isolating critical configuration from volatile RAM and main MCU flash. | Use Scenario: Storing door lock programming codes, mirror position memory, or lighting profiles in vehicle BCMs. IC Role / Device Role / Timing Role: Interface-compatible with legacy 8051 or PIC MCU peripherals; supports 1 MHz CLK (min 200 ns TCKH) for robust noise immunity in automotive harness environments. Use Value: Provides deterministic 6 ms write time for EEPROM updates during ignition-off state, avoiding CAN bus contention during active network operation. |
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 | 128 × 16-bit organization; same VCC range, temp grade, and package - no ORG pin, fixed 16-bit word size. | Requires host firmware to manage 16-bit data alignment; unsuitable for byte-addressed legacy codebases. | Select only if system architecture mandates 16-bit word access and avoids byte-level manipulation. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, Industrial grade, 8-lead SOIC - no Ready/Busy pin; uses Write In Progress (WIP) flag via STATUS register. | Requires SPI peripheral or bit-banged implementation; lacks hardware VCC-lockout below 1.5 V; different command set. | Choose when migrating to SPI-standard peripherals or when needing faster 20 MHz clock support over Microwire's 3 MHz limit. |
Compared with 93LC56B-I/SN, the 93LC56AT-I/SN offers native byte addressing without packing logic; versus AT25020B-MAHL-T, it delivers deterministic Ready/Busy signaling and tighter voltage-lockout protection - critical for brown-out resilience in resource-constrained microcontrollers.
Availability
The 93LC56AT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance settings, and medical device configuration requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56AT-I/SN 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 93LC56AT-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring simple, reliable nonvolatile storage with minimal pin count and firmware overhead.
FAQ
What is the memory organization of the 93LC56AT-I/SN?
The 93LC56AT-I/SN is a fixed 256 × 8-bit (2 Kbit) organization device. As an 'A' version, it has no ORG pin and does not support 16-bit word configuration. All read and write operations are byte-oriented, with address bits A7–A0 selecting one of 256 locations, each holding 8 bits of data.
Does the 93LC56AT-I/SN require an external pull-up resistor on the DO pin?
No external pull-up is required on the DO pin of the 93LC56AT-I/SN. The device drives DO actively during READ and Ready/Busy status checks. 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 when A0 = high during dummy-zero phase.
How does the 93LC56AT-I/SN protect against accidental writes during power-up?
The 93LC56AT-I/SN incorporates hardware voltage detection (VPOR ≈ 1.5 V) that disables all erase/write functions until VCC stabilizes above this threshold. Additionally, it powers up in Erase/Write Disable (EWDS) mode, requiring an explicit EWEN command before any WRITE or ERASE instruction executes - providing dual-layer protection.
What is the maximum clock frequency supported by the 93LC56AT-I/SN?
The 93LC56AT-I/SN supports a maximum clock frequency of 3 MHz when VCC ≥ 4.5 V. At 2.5 V ≤ VCC < 4.5 V, the maximum is 2 MHz. These limits are defined by AC timing parameters TCKH (clock high time) and TCKL (clock low time), which scale with supply voltage to ensure reliable setup/hold margins.
Can the 93LC56AT-I/SN be used in automotive applications?
The 93LC56AT-I/SN is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). For automotive use, Microchip specifies the 93LC56AT-E/SN variant - identical functionality but qualified to AEC-Q100 Grade 3. Using the -I version in under-hood environments may violate thermal reliability requirements.
93LC56AT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
93LC56AT-I/SN FAQ
1.How can I place an order for 93LC56AT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT-I/SN 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/SN reliable?
The price and inventory of 93LC56AT-I/SN 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/SN is usually 5 days.
3.What payment methods are accepted for 93LC56AT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT-I/SN?
93LC56AT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT-I/SN 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/SN?
For technical support, including 93LC56AT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT-I/SN requirements.
6.How does Aetrix verify that 93LC56AT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56AT-I/SN 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/SN meets industry standards.
7.What is the process for return or replacement of 93LC56AT-I/SN?
All 93LC56AT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT-I/SN, 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/SN part is unused and in its original packaging.
Return procedure for 93LC56AT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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