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Microchip Technology 93C56AT-I/SN
- Part No.:
- 93C56AT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93C56AT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,292
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Product details
Overview
93C56AT-I/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 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 signaling via DO pin - used in embedded microcontroller systems for parameter storage and calibration data retention.
For engineers reviewing the 93C56AT-I/SN datasheet, 93C56AT-I/SN pinout, 93C56AT-I/SN application, or 93C56AT-I/SN equivalent, this page delivers verified electrical specs, package mapping to SOIC-8 (SN), functional timing behavior, real-world use scenarios, and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals - no ORG pin (dedicated x8 organization). All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are initiated by a Start bit followed by opcode, address, and optional data, clocked on rising CLK edges. The DO pin serves dual role: data output during READ and Ready/Busy status indicator during programming.
Programming is self-timed: for 93C56A/B/C variants, the rising edge of CLK on the final data bit triggers auto-erase-and-write; VCC ≥ 4.5 V is mandatory for ERAL and WRAL operations. Power-on reset logic inhibits all operations below 3.8 V, and the device powers up in EWDS (Erase/Write Disable) state for data integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 words × 8 bits) - fixed x8 organization, no ORG pin; supports sequential read and single-byte write. |
| VCC operating range | 4.5 V to 5.5 V - strict minimum ensures reliable ERAL/WRAL execution and internal voltage detection (VPOR = 3.8 V). |
| Clock frequency | Up to 3 MHz at VCC ≥ 4.5 V - defines maximum SPI-like throughput; timing margins (TCKH/TCKL) scale with voltage. |
| Write cycle time | 2 ms typical - self-timed erase-and-write per byte or full array; eliminates need for external delay management. |
| Data retention | 200 years - guaranteed nonvolatile storage under industrial temp conditions without refresh. |
| Endurance | 1,000,000 erase/write cycles - enables frequent field updates in calibration or logging applications. |
| Interface | 3-wire Microwire-compatible (CS/CLK/DI/DO) - requires no additional control lines; supports daisy-chaining with shared CLK/CS. |
Pinout & Package
93C56AT-I/SN is packaged in 8-lead SOIC (SN), with lead finish Pb-free (Matte Tin). Pin 1 is CS; pin 2 is CLK; pin 3 is DI; pin 4 is DO; pin 5 is VSS; pin 6 is NC (no internal connection); pin 7 is NC; pin 8 is VCC. ORG pin is absent - consistent with 'A' version designation (x8-only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable: must be held high ≥250 ns between instructions; falling edge initiates standby, rising edge wakes device. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stopped mid-transfer without side effects. |
| DI (Pin 3) | Data Input | Accepts Start bit, instruction opcodes, addresses, and write data; must be stable before rising CLK edge. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read states. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be low-impedance return path for noise immunity. |
| NC (Pin 6 & 7) | No Connection | Internally unconnected; must be left floating or tied to VSS/VCC per board layout best practice - no functional impact. |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; voltage detect circuit blocks operation below 3.8 V to prevent corruption. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - device manages internal charge pump and verification automatically in ≤2 ms. |
| Automatic ERAL before WRAL | Ensures full-array readiness prior to bulk write; prevents partial writes and guarantees deterministic WRAL behavior. |
| Power-on/off data protection | Hardware-level lockout below 3.8 V prevents inadvertent writes during brown-out or power ramp-up/down sequences. |
| Ready/Busy status on DO | Enables polling-based firmware flow control without dedicated interrupt line - reduces MCU GPIO count. |
| 1,000,000 endurance cycles | Supports daily field recalibration over 27+ years at 100 writes/day - suitable for industrial maintenance and OTA update logs. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed at boot and during field service; x8 interface matches 8-bit MCU bus width. Use Value: Enables one-time calibration with 200-year data retention and immunity to power loss during write due to VPOR lockout. |
Use Scenario: Saving user preferences (temperature setpoints, timer durations, display brightness) across power cycles in smart microwaves. IC Role / Device Role / Timing Role: Low-pin-count configuration store interfaced directly to 8-bit MCU GPIOs using minimal 4-wire Microwire protocol. Use Value: Reduces BOM cost vs. I²C EEPROM; 2 ms write time allows responsive UI updates without perceptible lag. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Recording door lock actuation history and mirror position memory in entry-level BCMs. IC Role / Device Role / Timing Role: Industrial-temp EEPROM co-located with 8-bit automotive MCU; operates reliably at –40°C to +85°C. Use Value: Meets AEC-Q100 stress requirements via qualified process; 1M-cycle endurance supports lifetime vehicle diagnostics. |
Use Scenario: Storing FDA-mandated usage logs, calibration timestamps, and error counters in portable ultrasound units. IC Role / Device Role / Timing Role: Tamper-resistant audit trail storage with hardware write-protection (EWDS default on power-up). Use Value: Ensures regulatory compliance via guaranteed data integrity - no accidental overwrite without explicit EWEN command. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56AT-I/SN | VCC range 2.5–5.5 V; same 256×8 organization; supports wider voltage headroom for battery-powered designs. | Better suited for mixed-supply systems (e.g., 3.3 V MCU + 5 V peripherals); not rated for 4.5–5.5 V only operation. | Select when system VCC may dip below 4.5 V; verify VPOR (1.5 V) compatibility with power sequencing. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2.5–5.5 V, 2 Kbit (256×8); includes Write Protect pin and software write protection. | Requires dedicated WP pin and SPI master; lacks Ready/Busy polling - uses WIP flag in Status Register instead. | Choose for SPI-native designs needing hardware WP pin; avoid if Microwire compatibility or DO-status polling is required. |
Compared with 93LC56AT-I/SN, the 93C56AT-I/SN offers tighter VCC tolerance ideal for stable 5 V rails but less flexibility in low-voltage operation; versus AT25020B-MAHL-T, it provides simpler 3-wire timing and direct status feedback but lacks SPI standardization and hardware write protect.
Availability
93C56AT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93C56AT-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx EEPROM family was designed for cost-sensitive, space-constrained embedded systems requiring robust nonvolatile storage with minimal pin count and industry-standard Microwire compatibility.
FAQ
What is the memory organization of the 93C56AT-I/SN?
The 93C56AT-I/SN has a fixed 256 × 8-bit (2 Kbit) organization with no ORG pin - consistent with the 'A' suffix designation. It does not support x16 mode or external word-size selection. All read and write operations transfer 8-bit data words, and the address space spans 00h to FFh.
Does the 93C56AT-I/SN require an external pull-up resistor on the DO pin?
No, the 93C56AT-I/SN does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when inactive. However, a 10 kΩ pull-down on CS is recommended per Microchip's application guidance to prevent spurious wake-up.
What is the minimum VCC required for the 93C56AT-I/SN to operate correctly?
The 93C56AT-I/SN requires VCC ≥ 4.5 V for full functionality. Its internal voltage detector (VPOR) disables all operations below 3.8 V to prevent data corruption. Operation at 4.5–5.5 V ensures reliable ERAL, WRAL, and self-timed write cycles - unlike 93AA/93LC variants with lower VCC minima.
How does the 93C56AT-I/SN handle write protection after power-up?
The 93C56AT-I/SN powers up in Erase/Write Disable (EWDS) mode. Before any ERASE or WRITE instruction can execute, an EWEN (Erase/Write Enable) command must first be issued. This hardware-enforced default prevents accidental writes during power transitions or firmware initialization errors.
Can the 93C56AT-I/SN be used in place of the 93C56B-I/SN?
No - the 93C56AT-I/SN (x8 organization) is not functionally interchangeable with the 93C56B-I/SN (x16 organization). They differ in address width (8-bit vs. 7-bit), data width (8-bit vs. 16-bit), instruction timing (20 vs. 27 CLK cycles for READ/WRITE), and opcode mapping. Software and hardware interfaces are incompatible.
93C56AT-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:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93C56AT-I/SN FAQ
1.How can I place an order for 93C56AT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56AT-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 93C56AT-I/SN reliable?
The price and inventory of 93C56AT-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 93C56AT-I/SN is usually 5 days.
3.What payment methods are accepted for 93C56AT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56AT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56AT-I/SN?
93C56AT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56AT-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 93C56AT-I/SN?
For technical support, including 93C56AT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56AT-I/SN requirements.
6.How does Aetrix verify that 93C56AT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93C56AT-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 93C56AT-I/SN meets industry standards.
7.What is the process for return or replacement of 93C56AT-I/SN?
All 93C56AT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93C56AT-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 93C56AT-I/SN part is unused and in its original packaging.
Return procedure for 93C56AT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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