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Microchip Technology 93C56AT-E/MS
- Part No.:
- 93C56AT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93C56AT-E/MS.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,644
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Product details
Overview
93C56AT-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 1,000,000 endurance cycles - used for parameter storage in embedded controllers and sensor calibration modules.
For engineers reviewing the 93C56AT-E/MS datasheet, 93C56AT-E/MS pinout, 93C56AT-E/MS application, or 93C56AT-E/MS equivalent, this page delivers verified electrical specs, MSOP-8 package mapping, functional timing behavior, real-world use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The 93C56AT-E/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (dedicated x8 organization). Its internal logic enforces power-on write protection via VCC detect at 3.8 V and requires explicit EWEN instruction before any erase/write operation.
It uses self-timed auto-erase-and-write architecture: for 93C-series devices, the rising edge of CLK on the final data bit initiates the 2 ms programming cycle (TWC), and DO provides Ready/Busy status polling during active operations - critical for deterministic firmware timing in resource-constrained microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) nonvolatile EEPROM array - fixed x8 organization, no ORG pin dependency. |
| VCC range | 4.5 V to 5.5 V - supports legacy 5 V systems; VCC detect threshold at 3.8 V prevents inadvertent writes during brown-out. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no I²C or SPI protocol; requires master-controlled clock and start-bit detection. |
| Write cycle time | 2 ms typical (TWC) - self-timed; eliminates need for external delay timers in host firmware. |
| Endurance | 1,000,000 erase/write cycles - enables frequent recalibration or logging in industrial control nodes. |
| Data retention | 200 years at 25°C - ensures long-term reliability in unattended equipment without battery backup. |
| Temperature grade | Industrial (–40°C to +85°C) - qualified for extended ambient operation in factory automation and motor drives. |
Pinout & Package
8-pin MSOP (MS) 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 corner located at top-left when notch faces up.
| 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 allows ongoing write completion. |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence without state corruption. |
| 3 (DI) | Data Input | Accepts start bit, opcode, address, and write data; tied high with CS and CLK for start condition detection. |
| 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 digital and analog functions; exposed pad may be connected to VSS for thermal relief. |
| 6 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS - not usable as ORG or auxiliary signal. |
| 7 (NC) | No Connection | Internally unconnected; identical constraint as Pin 6 - no routing or loading permitted. |
| 8 (VCC) | Power Supply | 4.5–5.5 V supply; powers internal charge pump for write/erase; voltage detect circuit blocks writes below 3.8 V. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates host MCU wait-state overhead - 2 ms TWC fully autonomous after final CLK edge. |
| Power-on/off data protection | VCC detect at 3.8 V disables all write operations during power ramp-up/down - prevents corruption during supply transients. |
| EWEN/EWDS command lock | Explicit Erase/Write Enable (EWEN) required before each write; EWDS restores protection - prevents accidental overwrites in fielded units. |
| Sequential read mode | Holding CS high enables continuous address increment and data output - reduces instruction overhead for bulk reads. |
| Ready/Busy status on DO | DO pin doubles as status indicator - polled without extra pins or bus arbitration, simplifying firmware flow control. |
Applications
| Motor Control Parameter Storage | Industrial Sensor Calibration |
|---|---|
Use Scenario: Storing motor winding resistance, current limits, and PID coefficients in BLDC driver boards operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime updates via MCU's GPIO-banged Microwire interface. Use Value: 256 × 8-bit capacity holds full calibration set; 1M endurance supports field recalibration every 1000 hours over 10+ year product life. |
Use Scenario: Retaining temperature-compensated offset/gain values for pressure sensors in factory-floor instrumentation. IC Role / Device Role / Timing Role: Standalone serial EEPROM interfaced to sensor signal conditioner IC or microcontroller ADC subsystem. Use Value: 200-year data retention ensures calibration validity through equipment lifetime without periodic reprogramming. |
| Smart Energy Meter Firmware Settings | Medical Diagnostic Device Configuration |
Use Scenario: Holding tariff tables, pulse constants, and communication parameters in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure configuration store isolated from main flash; accessed only during meter initialization or utility command execution. Use Value: 4.5–5.5 V operation matches meter's regulated 5 V rail; ERAL/WRAL commands simplify factory provisioning of multiple variants. |
Use Scenario: Saving user-selected test modes, alarm thresholds, and language preferences in portable ECG analyzers. IC Role / Device Role / Timing Role: Dedicated memory peripheral for UI-related settings, decoupled from safety-critical processing firmware. Use Value: Industrial temp grade ensures reliability inside sealed enclosures with passive thermal management; Pb-free RoHS compliance meets medical regulatory requirements. |
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 | Same 8-pin MSOP package, but 128 × 16-bit (x16) organization and 2.5–5.5 V VCC range. | Requires host software adaptation for 16-bit word access; supports wider voltage margin for mixed-signal designs. | Select if system uses 16-bit data paths and needs lower VCC headroom; verify timing compatibility with TCKH/TCKL at 2.5 V. |
| AT25020B-MAHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 20 MHz max clock, 5 ms write cycle. | Requires SPI hardware/peripheral instead of GPIO-banged Microwire; longer write latency impacts real-time response. | Choose for designs already using SPI peripherals; avoid if firmware lacks SPI stack or requires deterministic <2 ms write completion. |
Compared with 93C56AT-E/MS, the 93LC56BT-E/MS offers broader supply flexibility but mandates x16 data handling, while the AT25020B-MAHL-T trades Microwire simplicity for faster clock rates at the cost of longer write latency and interface hardware dependency.
Availability
93C56AT-E/MS is available at Aetrix Electronics and suitable for motor control parameter storage, industrial sensor calibration, smart energy meter firmware settings, and medical diagnostic device configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93C56AT-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, with global design and manufacturing operations.
The 93Cxx series was designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and deterministic write timing - targeting industrial, automotive, and consumer control applications.
FAQ
What is the memory organization and capacity of the 93C56AT-E/MS?
The 93C56AT-E/MS is a 2 Kbit serial EEPROM organized as 256 words × 8 bits (x8). It has no ORG pin - unlike 'C' variants - and is fixed to 8-bit operation. This matches byte-addressable MCU interfaces and avoids bit-width conversion logic in firmware. The 93C56AT-E/MS delivers exactly 256 bytes of user-accessible nonvolatile storage.
Does the 93C56AT-E/MS require an external pull-up resistor on the DO pin?
No, the 93C56AT-E/MS does not require an external pull-up on DO. Its DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when inactive. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict during dummy-zero read preamble - per Microchip DS21794G Section 2.2.
What is the minimum VCC required to enable write operations on the 93C56AT-E/MS?
The 93C56AT-E/MS requires VCC ≥ 4.5 V to operate, and its internal voltage detector blocks all erase/write functions below 3.8 V (VPOR = 3.8 V). This ensures data integrity during power-up, brown-out, or battery sag - writes are automatically inhibited until stable 5 V rail is confirmed. Operation outside 4.5–5.5 V violates Absolute Maximum Ratings.
How does the 93C56AT-E/MS indicate readiness after a write cycle?
The 93C56AT-E/MS signals readiness via the DO pin: when CS is brought high ≥250 ns after initiating a write, DO outputs low (busy) until completion, then transitions high (ready). This Ready/Busy status is sampled synchronously with CLK - no additional status register or command is needed. After completion, issuing a Start bit and lowering CS clears the status flag.
Is the 93C56AT-E/MS pin-compatible with other 93XX56 variants in MSOP-8 packaging?
Yes, the 93C56AT-E/MS shares identical MSOP-8 pinout (CS, CLK, DI, DO, VSS, NC, NC, VCC) with all 93XX56A/B/C variants in the same package - including 93LC56AT-E/MS and 93AA56AT-E/MS. However, functional compatibility depends on VCC range, organization (x8/x16), and timing: 93C56AT-E/MS requires 4.5–5.5 V and has 2 ms TWC, whereas 93AA56A supports 1.8 V and has 6 ms TWC.
93C56AT-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
- 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-MSOP
93C56AT-E/MS FAQ
1.How can I place an order for 93C56AT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56AT-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 93C56AT-E/MS reliable?
The price and inventory of 93C56AT-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 93C56AT-E/MS is usually 5 days.
3.What payment methods are accepted for 93C56AT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56AT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56AT-E/MS?
93C56AT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56AT-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 93C56AT-E/MS?
For technical support, including 93C56AT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56AT-E/MS requirements.
6.How does Aetrix verify that 93C56AT-E/MS is sourced from the original manufacturer or authorized distributors?
All 93C56AT-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 93C56AT-E/MS meets industry standards.
7.What is the process for return or replacement of 93C56AT-E/MS?
All 93C56AT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93C56AT-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 93C56AT-E/MS part is unused and in its original packaging.
Return procedure for 93C56AT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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