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Microchip Technology 93C56CT-E/MS
- Part No.:
- 93C56CT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C56CT-E/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
93C56CT-E/MS 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 operation (–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 system configuration storage, sensor calibration retention, and firmware parameter backup.
For engineers reviewing the 93C56CT-E/MS datasheet, 93C56CT-E/MS pinout, 93C56CT-E/MS application, or 93C56CT-E/MS equivalent, key selection criteria include VCC operating range (4.5–5.5 V), 8-bit x256 organization (fixed, no ORG pin), MSOP-8 package compatibility, 1 million erase/write endurance, and 200-year data retention - critical for long-life industrial control and automotive subsystems.
Technical Context
The 93C56CT-E/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It operates exclusively in 8-bit mode ('A' variant), eliminating ORG pin dependency and simplifying host controller logic. All erase/write operations are self-timed and include auto-erase prior to write, with dedicated ERAL and WRAL commands requiring ≥4.5 V for execution.
Power management includes built-in POR detection at 3.8 V, standby current ≤5 µA, and automatic entry into EWDS (Erase/Write Disable) state on power-up. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during programming - asserted low until completion of TWC = 2 ms (typical) write cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed x8 organization; no ORG pin required |
| VCC operating range | 4.5 V to 5.5 V - supports legacy 5 V systems; POR threshold at 3.8 V prevents spurious writes |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no address bus needed |
| Endurance | 1,000,000 erase/write cycles - enables frequent field updates in telemetry or logging applications |
| Data retention | >200 years at 85°C - ensures configuration integrity over full product lifecycle without refresh |
| Write cycle time | 2 ms typical (TWC) - deterministic timing for real-time host polling of DO pin during programming |
| Temperature grade | Industrial (–40°C to +85°C) - qualified for factory automation, motor drives, and industrial HMI |
Pinout & Package
8-pin MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating). Pin 1 marked by laser dot; pin 1 location confirmed per DS21794G-page 17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge (93C series) |
| CLK | Serial Clock | Synchronizes all data transfers; rising-edge sampling for DI/DO; stoppable mid-sequence without corruption |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; tied to DO only with external 10 kΩ resistor to avoid bus conflict |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires TCSL ≥250 ns before status check |
| VSS | Ground | Reference for all I/O and internal logic; exposed pad may be connected to VSS for thermal relief |
| NC | No Connection | Pin 7 in MSOP - internally unconnected; must be left floating or tied to VSS (no drive capability) |
| VCC | Power Supply | 4.5–5.5 V supply; powers internal charge pump for erase/write; POR circuit blocks operation below 3.8 V |
| ORG | Organization Select | Not present - 93C56A variant has NC on this pin; memory fixed at 256 × 8-bit |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control; host polls DO pin instead of managing variable delay |
| Auto-erase before Write | Guarantees clean page before data commit; prevents partial-write corruption without software overhead |
| ERAL before WRAL | Hardware-enforced sequence prevents accidental partial array overwrite; requires no host-side validation |
| Power-On/Off Data Protection | POR circuit disables write logic below 3.8 V; prevents data loss during brown-out or hot-swap events |
| Ready/Busy Status on DO | Single-pin status reporting reduces PCB routing complexity versus dedicated BUSY signal |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and calibration offsets in programmable logic controllers subject to frequent firmware updates and field reconfiguration. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed via SPI-like Microwire interface during boot or maintenance mode; 2 ms write latency accommodated by watchdog-timed host polling. Use Value: 1M endurance supports >10 years of daily recalibration; 200-year retention eliminates need for battery-backed SRAM or external supervision. | Use Scenario: Retaining seat position memory, mirror angle presets, and lighting profiles across ignition cycles in 12 V automotive systems. IC Role / Device Role / Timing Role: Dedicated configuration EEPROM interfaced to 8-bit microcontroller with limited GPIO; operates within 4.5–5.5 V rail during cold-crank conditions. Use Value: POR at 3.8 V ensures write inhibition during cranking dips; industrial temp grade covers under-hood ambient extremes without derating. |
| Medical Infusion Pump Parameter Backup | Smart Energy Meter Firmware Settings |
Use Scenario: Preserving drug library, dose limits, and alarm thresholds in Class II medical devices requiring regulatory-compliant nonvolatile storage. IC Role / Device Role / Timing Role: Safety-critical configuration store accessed only during setup or service mode; write-protected via EWEN/EWDS command sequence. Use Value: Hardware-level write disable (EWDS) prevents unintended modification; 256 × 8-bit capacity matches typical parameter set size with margin. | Use Scenario: Holding tariff schedules, CT/PT ratios, and communication credentials in ANSI C12.22-compliant electricity meters deployed for 15+ year lifespans. IC Role / Device Role / Timing Role: Long-term settings repository updated infrequently but requiring absolute reliability; accessed via isolated UART-to-Microwire bridge IC. Use Value: >200-year retention meets utility-grade longevity requirements; Pb-free MSOP-8 supports RoHS-compliant reflow assembly. |
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/MS | 2.5–5.5 V VCC range; 128 × 16-bit organization; same MSOP-8 package and pinout | Requires host support for 16-bit word access; lower minimum voltage enables 3.3 V system integration | Select when migrating to mixed-voltage designs or consolidating 16-bit data structures; verify clock timing (TCKH/TCKL) at 2.5 V |
| AT25020B-MAHL-T | SPI interface (4-wire), 2.5–5.5 V, 2 Kbit (256 × 8), 5 MHz max clock, WP pin for hardware write protect | Requires additional WP trace and SPI-capable MCU peripheral; no Ready/Busy pin - relies on WIP flag polling | Choose for higher-speed access or existing SPI infrastructure; trade DO status simplicity for faster throughput and standard protocol compliance |
Compared with 93LC56BT-E/MS, the 93C56CT-E/MS offers tighter VCC tolerance for 5 V-only systems and simpler 8-bit addressing, while AT25020B-MAHL-T provides faster SPI throughput and industry-standard interface - but sacrifices the integrated Ready/Busy signaling and Microwire pin-count efficiency.
Availability
93C56CT-E/MS is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and medical device manufacturing requiring stable component supply across multi-year production programs.
Supply support for 93C56CT-E/MS 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.
The 93Cxx family was designed specifically for cost-sensitive, low-power embedded systems needing reliable, small-footprint serial EEPROM - emphasizing robustness in noisy industrial environments and long-term data integrity.
FAQ
What is the exact memory organization of the 93C56CT-E/MS?
The 93C56CT-E/MS is a fixed 256 × 8-bit (2 Kbit) EEPROM - it belongs to the 'A' variant subgroup and does not use the ORG pin. Its memory map consists of 256 addressable bytes, each accessible via 8-bit address field in READ/WRITE instructions. This differs from 'B' (128 × 16-bit) and 'C' (configurable) variants in the same family.
Does the 93C56CT-E/MS require an external pull-up resistor on the DO pin?
No, the 93C56CT-E/MS does not require an external pull-up on DO. During READ, DO actively drives high/low logic levels; during READY/BUSSY status checks, it outputs valid logic states. However, if DI and DO are shorted (shared bus), a 10 kΩ series resistor is mandatory to prevent bus conflict when A0 = high during dummy-zero phase.
What is the minimum VCC required for reliable write operation of the 93C56CT-E/MS?
The 93C56CT-E/MS requires VCC ≥4.5 V for all write, erase, ERAL, and WRAL operations. Its POR circuit disables programming below 3.8 V, and AC timing parameters (e.g., TWC = 2 ms) are specified only across 4.5–5.5 V. Operation at 4.4 V or lower risks incomplete writes or data corruption.
How is Ready/Busy status monitored on the 93C56CT-E/MS?
Ready/Busy status is monitored by sampling the DO pin after bringing CS high for ≥250 ns (TCSL) following initiation of an erase or write command. DO = low indicates ongoing operation; DO = high signals completion. After completion, issuing a Start bit followed by CS low clears the status latch. No external interrupt is needed.
Is the 93C56CT-E/MS pin-compatible with other 8-pin MSOP EEPROMs like the 25AA02E48?
No, the 93C56CT-E/MS is not pin-compatible with SPI EEPROMs such as the 25AA02E48. While both use MSOP-8 packages, the 93C56CT-E/MS uses Microwire (3-wire: CS, CLK, DI/DO) with no dedicated WP or HOLD pins, whereas the 25AA02E48 uses SPI (4-wire: CS, SCK, SI, SO) plus WP/HOLD. Pin functions differ at positions 3 (DI vs SI), 4 (DO vs SO), and 7 (NC vs HOLD).
93C56CT-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8, 128 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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-MSOP
93C56CT-E/MS FAQ
1.How can I place an order for 93C56CT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56CT-E/MS 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 93C56CT-E/MS reliable?
The price and inventory of 93C56CT-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93C56CT-E/MS is usually 5 days.
3.What payment methods are accepted for 93C56CT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56CT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56CT-E/MS?
93C56CT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56CT-E/MS 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 93C56CT-E/MS?
For technical support, including 93C56CT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56CT-E/MS requirements.
6.How does Aetrix verify that 93C56CT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93C56CT-E/MS 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 93C56CT-E/MS meets industry standards.
7.What is the process for return or replacement of 93C56CT-E/MS?
All 93C56CT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C56CT-E/MS, 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 93C56CT-E/MS part is unused and in its original packaging.
Return procedure for 93C56CT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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