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Microchip Technology 93C56AT-E/SN
- Part No.:
- 93C56AT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C56AT-E/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,664
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Product details
Overview
93C56AT-E/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and automotive-grade temperature operation (–40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status via DO pin - used for nonvolatile parameter storage in engine control units and automotive sensor modules.
For engineers reviewing the 93C56AT-E/SN datasheet, 93C56AT-E/SN pinout, 93C56AT-E/SN application, or 93C56AT-E/SN equivalent, key selection criteria include its automotive temperature rating, dedicated 8-bit organization (no ORG pin), 2 ms write cycle time, 1 million endurance cycles, and SOIC-8 (SN) package compatibility with legacy board layouts.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals. It operates exclusively in x8 mode (ORG pin not present), requiring no external configuration logic. All instructions - READ, WRITE, ERASE, ERAL, WRAL - are initiated by a Start bit followed by opcode, address, and data bits clocked on CLK rising edges.
Power-on data protection is enforced by internal voltage detection (VPOR = 3.8 V typical); programming is disabled below this threshold. The device powers up in EWDS (Erase/Write Disable) state, mandating an explicit EWEN command before any WRITE or ERASE operation - a hardware-level safeguard against accidental overwrites in noisy automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin required |
| VCC range | 4.5 V to 5.5 V - automotive supply rail compatible; VPOR = 3.8 V prevents operation during brown-out |
| Temp range | –40°C to +125°C (Automotive E grade) - qualified for under-hood and transmission control applications |
| Write cycle time | 2 ms max - self-timed; eliminates need for external timing control or polling overhead |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration or fault-log updates in field-deployed systems |
| Data retention | >200 years at +25°C - ensures long-term reliability without refresh in safety-critical firmware storage |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - minimal GPIO usage; supports daisy-chaining only via external multiplexing |
Pinout & Package
8-lead SOIC package (SN suffix), Pb-free Matte Tin finish, standard footprint compatible with JEDEC MS-012AA. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby but completes ongoing write |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers on rising edge; stoppable at any point; no clock required during self-timed write |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; high-impedance when not selected |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires CS high ≥250 ns to sample status |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection to system ground plane |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice - no pull-up/down required |
| 7 (NC) | No Connect | Same as Pin 6; dual NC pins confirm absence of ORG functionality in 'A' version |
| 8 (VCC) | Power Supply | 4.5–5.5 V input; internal POR circuit disables programming below 3.8 V; decoupling capacitor (0.1 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry and software delay loops - reduces BOM cost and firmware complexity |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial-write corruption in power-loss scenarios |
| Power-on/off data protection | Hardware-enforced lockout below VPOR = 3.8 V - prevents invalid writes during power ramp-up/down in vehicle ignition cycles |
| EWEN/EWDS security protocol | Requires explicit enable before each programming sequence; mitigates spurious noise-induced writes in EMI-heavy automotive harnesses |
| Ready/Busy status on DO | Enables efficient polling without dedicated status lines - saves MCU GPIO and simplifies PCB routing |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, learned idle air control parameters, and diagnostic trouble code (DTC) history across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter memory with guaranteed write integrity during engine cranking voltage dips. Use Value: 3.8 V VPOR threshold ensures data remains protected during 4.2 V battery sag; 2 ms write time enables logging within tight real-time control windows. | Use Scenario: Retaining camera calibration offsets, radar sensor compensation tables, and firmware update staging flags in lane-keeping assist modules. IC Role / Device Role / Timing Role: Secure configuration storage with hardware write-disable (EWDS) preventing corruption from CAN bus transients. Use Value: Automotive temperature rating (–40°C to +125°C) supports operation inside sealed radar housings; 1M endurance accommodates daily recalibration cycles. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Logging gear shift adaptation profiles, clutch wear metrics, and thermal derating thresholds for automatic transmissions. IC Role / Device Role / Timing Role: Field-updatable memory with automatic ERAL/WRAL support for full-table reprogramming. Use Value: 2 ms write cycle allows complete 256-byte table overwrite in <512 ms - well within TCM's 1-second firmware update timeout budget. | Use Scenario: Holding door lock/unlock preferences, mirror position memory, and lighting fade profiles across vehicle power-down events. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced directly to 8-bit microcontroller GPIOs with minimal external components. Use Value: SOIC-8 (SN) package enables drop-in replacement in legacy BCM designs; 100 µA max read current extends battery backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93C56CT-E/SN | Includes ORG pin for x8/x16 word-size selection; otherwise identical electrical specs and package | Supports both 8-bit and 16-bit host interfaces; requires external ORG logic tie-off for x8 use | Select only if future design flexibility for 16-bit data path is needed; adds no benefit for fixed 8-bit systems |
| AT25020B-MAHL-T | SPI interface (4-wire), 2.5–5.5 V VCC, 5 MHz max clock, same 2 Kbit x8 density and automotive temp grade | Requires SPI-capable MCU peripheral; incompatible pinout and protocol - not drop-in | Choose when migrating to SPI-based architecture or consolidating with other SPI peripherals to reduce signal count |
Compared with 93C56CT-E/SN, the 93C56AT-E/SN offers simpler interface wiring and guaranteed x8 behavior without ORG management; versus AT25020B-MAHL-T, it retains Microwire compatibility for legacy MCU designs but trades higher clock speed for lower pin count.
Availability
93C56AT-E/SN is available at Aetrix Electronics and suitable for automotive control units, sensor calibration systems, and industrial programmable logic controllers requiring stable component supply across extended product lifecycles.
Supply support for 93C56AT-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 devices, and memory solutions, headquartered in Chandler, Arizona.
The 93Cxx series was designed specifically for cost-sensitive, low-power, nonvolatile memory applications in automotive, industrial, and consumer systems where Microwire interface simplicity and robust data retention are critical.
FAQ
What is the function of the NC pins on the 93C56AT-E/SN?
The 93C56AT-E/SN has two No-Connect (NC) pins - Pin 6 and Pin 7 - because it belongs to the 'A' version family with fixed 8-bit organization and no ORG pin. These pins are internally unconnected and must be left floating or tied to VSS per PCB layout guidelines. They are not reserved for future functionality and do not affect 93C56AT-E/SN operation.
Does the 93C56AT-E/SN require an external pull-up resistor on the DO pin?
No, the 93C56AT-E/SN does not require an external pull-up on the DO pin. The DO pin actively drives high/low during READ or Ready/Busy status reporting and enters High-Z when deselected or idle. A pull-up may interfere with valid low-level status signaling and is explicitly discouraged in Microchip's DS21794G design guidance.
Can the 93C56AT-E/SN be used in a 3.3 V system?
No, the 93C56AT-E/SN is not rated for 3.3 V operation. Its specified VCC range is strictly 4.5 V to 5.5 V, and its power-on reset threshold (VPOR) is 3.8 V typical. Operating below 4.5 V risks unreliable communication, incomplete writes, or premature disablement - use 93LC56AT-E/SN (2.5–5.5 V) or 93AA56AT-I/SN (1.8–5.5 V) for lower-voltage systems.
How is data protection implemented during power loss on the 93C56AT-E/SN?
Data protection on the 93C56AT-E/SN is implemented via hardware-level voltage monitoring: the internal VPOR circuit disables all write/erase operations when VCC falls below ~3.8 V. Combined with mandatory EWEN activation and automatic ERAL before WRAL, this ensures that partial writes or corrupted pages cannot be committed during brown-out conditions common in automotive power networks.
What is the minimum CS low time required between commands on the 93C56AT-E/SN?
The minimum Chip Select low time (TCSL) between consecutive instructions on the 93C56AT-E/SN is 250 ns across its full operating voltage and temperature range. This interval resets the internal instruction decoder and ensures reliable command separation - violating this timing may result in opcode misinterpretation or skipped operations.
93C56AT-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:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C56AT-E/SN FAQ
1.How can I place an order for 93C56AT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56AT-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 93C56AT-E/SN reliable?
The price and inventory of 93C56AT-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 93C56AT-E/SN is usually 5 days.
3.What payment methods are accepted for 93C56AT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56AT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56AT-E/SN?
93C56AT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56AT-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 93C56AT-E/SN?
For technical support, including 93C56AT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56AT-E/SN requirements.
6.How does Aetrix verify that 93C56AT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93C56AT-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 93C56AT-E/SN meets industry standards.
7.What is the process for return or replacement of 93C56AT-E/SN?
All 93C56AT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C56AT-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 93C56AT-E/SN part is unused and in its original packaging.
Return procedure for 93C56AT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93C56AT-E/SN Tags
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AT24C02C-XHM-T
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