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Microchip Technology 93LC56AT-E/SN
- Part No.:
- 93LC56AT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56AT-E/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,686
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Product details
Overview
The 93LC56AT-E/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 automotive temperature range (−40°C to +125°C), and housed in an 8-lead SOIC package (SN). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used for configuration storage in engine control units and infotainment boot loaders.
For engineers reviewing the 93LC56AT-E/SN datasheet, 93LC56AT-E/SN pinout, 93LC56AT-E/SN application, or 93LC56AT-E/SN equivalent, key selection criteria include its automotive-grade temperature support, dedicated 8-bit organization (no ORG pin), 3-wire serial protocol compatibility, and write-cycle timing of 6 ms at 2.5–5.5 V - critical for deterministic firmware update and calibration retention in safety-critical embedded systems.
Technical Context
This device implements a synchronous serial Microwire interface with CS/CLK/DI/DO signaling and no internal ORG pin - confirming fixed 8-bit word organization. It uses CMOS EEPROM technology with on-chip charge pump for write operations and includes hardware-level power-on reset detection (VPOR = 1.5 V typical) to prevent inadvertent writes during brown-out conditions.
Command execution follows strict clock-synchronized bit-stream protocol: start condition requires simultaneous high CS and DI on CLK rising edge; all instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) require precise clock cycle counts (e.g., 20 for READ, 20 for WRITE); DO pin serves dual role as data output and Ready/Busy status indicator during programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - provides sufficient space for bootloader parameters, sensor calibration tables, or CAN node IDs in compact automotive modules. |
| VCC range | 2.5 V to 5.5 V - supports direct connection to 3.3 V or 5 V microcontroller I/O rails without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - enables reliable field updates over 10+ years in telematics log storage applications. |
| Data retention | 200 years at 25°C - ensures configuration integrity across full vehicle lifecycle without refresh. |
| Write cycle time | 6 ms max (TWC) - guarantees predictable worst-case latency for non-blocking firmware update routines. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and reduces PCB routing complexity vs. SPI/I²C. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified for under-hood ECU mounting without derating. |
| Package | 8-lead SOIC (SN) - industry-standard footprint compatible with automated assembly and thermal rework processes. |
Pinout & Package
8-lead SOIC (SN) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. No ORG pin present - confirms fixed 8-bit organization per device family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable: must be held ≥250 ns low between commands; initiates self-timed write on falling edge for 93LC56A/B variants. |
| CLK (Pin 2) | Serial Clock | Synchronizes all bit transfers; rising edge clocks data in/out; stoppable mid-sequence without corruption. |
| DI (Pin 3) | Data Input | Receives start bit, opcode, address, and write data; tolerant of bus conflict when shared with DO (requires series resistor). |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status polling enabled only after TCSL ≥250 ns. |
| VSS (Pin 5) | Ground | Reference for all logic and analog circuitry; must be low-impedance connection to minimize noise-induced write errors. |
| NC (Pin 6, Pin 7) | No Connection | Unused terminals - must remain unconnected; not bonded internally per 93LC56A device definition. |
| VCC (Pin 8) | Power Supply | Supplies core logic and charge pump; VPOR threshold (1.5 V) prevents operation below safe voltage margin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - simplifies host firmware by removing need for software delays or status polling loops. |
| Automatic ERAL before WRAL | Guarantees clean memory state prior to bulk write - prevents partial overwrite corruption in calibration table updates. |
| Power-on/off data protection | Hardware VPOR circuitry disables writes below 1.5 V - prevents data corruption during power ramp-up/down in automotive battery transients. |
| Erase/Write Enable/Disable (EWEN/EWDS) | Prevents accidental writes: device powers up in EWDS mode; explicit EWEN required before any programming command. |
| Ready/Busy status on DO | Enables efficient polling without dedicated status register - reduces host MCU GPIO count and interrupt overhead. |
| Sequential read function | Allows continuous address increment on single CS assertion - accelerates reading of contiguous configuration blocks (e.g., CAN message filters). |
Applications
| Engine Control Unit (ECU) | Infotainment System Boot Loader |
|---|---|
Use Scenario: Storing fuel map coefficients, ignition timing offsets, and OBD-II diagnostic trouble code history across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with deterministic 6 ms write latency and automotive temperature resilience. Use Value: Enables field-updatable calibration without requiring external backup power or complex wear-leveling firmware. | Use Scenario: Holding secure boot keys, firmware signature hashes, and display resolution profiles loaded before OS initialization. IC Role / Device Role / Timing Role: Trusted configuration store accessed early in boot sequence via simple 3-wire interface. Use Value: Reduces boot time vs. NAND/NOR flash by eliminating complex controller initialization and ECC handling. |
| ADAS Camera Module | Body Control Module (BCM) |
Use Scenario: Retaining lens distortion correction parameters and auto-exposure gain settings calibrated during manufacturing. IC Role / Device Role / Timing Role: Factory-programmed parameter storage with 200-year data retention and 1M endurance for recalibration events. Use Value: Eliminates need for re-calibration after battery disconnect or module replacement. | Use Scenario: Saving user preferences (window position, mirror angle, lighting themes) and door lock event logs. IC Role / Device Role / Timing Role: Low-power configuration memory supporting <1 µA standby current and fast wake-from-sleep writes. Use Value: Extends battery life in always-on BCM designs while maintaining persistent user state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-E/SN | 128 × 16-bit organization (x16), same VCC/temp/package - requires host software adaptation for 16-bit word access. | Preferred where MCU has native 16-bit peripheral or memory-mapped I/O alignment improves throughput. | Select only if system architecture benefits from wider word access; otherwise 93LC56AT-E/SN avoids bit-packing overhead. |
| AT25DF021-SSH-T | SPI interface (4-wire), 2 Mbit density, 2.7–3.6 V only, no automotive temp rating - higher density but incompatible protocol and narrower voltage range. | Suitable for non-automotive industrial controllers needing larger config space and SPI-native hosts. | Not drop-in; requires PCB redesign (SPI vs. Microwire), firmware driver rewrite, and voltage rail verification. |
Compared with 93LC56BT-E/SN, the 93LC56AT-E/SN offers simpler byte-aligned addressing and eliminates 16-bit data marshaling; compared with AT25DF021-SSH-T, it provides guaranteed automotive qualification, broader VCC range, and pin-compatible migration path within Microchip's 93XX family.
Availability
The 93LC56AT-E/SN is available at Aetrix Electronics and suitable for engine control units, infotainment boot loaders, and ADAS camera modules requiring stable component supply across extended automotive production lifecycles.
Supply support for 93LC56AT-E/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56AT-E/SN belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-power, and automotive-qualified nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the memory organization of the 93LC56AT-E/SN?
The 93LC56AT-E/SN has a fixed 256 × 8-bit (2 Kbit) organization. It is an 'A' version device with no ORG pin - meaning word size is permanently configured for 8-bit communication, eliminating external configuration logic and simplifying host interface design.
Does the 93LC56AT-E/SN require an external pull-up resistor on the DO pin?
No, the 93LC56AT-E/SN 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 state when inactive. A series resistor (e.g., 10 kΩ) is recommended only if DI and DO are shorted on the PCB to prevent bus conflict.
What is the minimum VCC required for reliable operation of the 93LC56AT-E/SN?
The 93LC56AT-E/SN requires VCC ≥2.5 V for full specification compliance. Its power-on reset circuit triggers at VPOR ≈1.5 V (typical), disabling all write operations below this threshold - ensuring data integrity during brown-out conditions common in automotive 12 V systems.
How is write protection implemented on the 93LC56AT-E/SN?
Write protection on the 93LC56AT-E/SN uses dual mechanisms: hardware VPOR circuitry disables writes below 1.5 V, and software-controlled EWEN/EWDS commands. The device powers up in EWDS (Erase/Write Disable) mode; an explicit EWEN instruction must precede any ERASE or WRITE command.
Can the 93LC56AT-E/SN be used in place of the 93LC56A-I/SN?
Yes, the 93LC56AT-E/SN is a direct replacement for the 93LC56A-I/SN in terms of pinout, interface, and command set. The 'E' suffix denotes automotive temperature grade (−40°C to +125°C), while 'I' is industrial (−40°C to +85°C); both share identical electrical specs and package (SN), making it suitable for upgraded thermal requirements without design changes.
93LC56AT-E/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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56AT-E/SN FAQ
1.How can I place an order for 93LC56AT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT-E/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-E/SN reliable?
The price and inventory of 93LC56AT-E/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-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC56AT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT-E/SN?
93LC56AT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT-E/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-E/SN?
For technical support, including 93LC56AT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT-E/SN requirements.
6.How does Aetrix verify that 93LC56AT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56AT-E/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-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC56AT-E/SN?
All 93LC56AT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT-E/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-E/SN part is unused and in its original packaging.
Return procedure for 93LC56AT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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