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Microchip Technology AT93C56A-10TU-2.7-T
- Part No.:
- AT93C56A-10TU-2.7-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT93C56A-10TU-2.7-T.pdf
- Description:
- IC EEPROM 2KBIT 3-WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,345
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Product details
Overview
AT93C56A-10TU-2.7-T from Microchip Technology (formerly Atmel) is a 2K-bit three-wire serial EEPROM with user-selectable 256 × 8 or 128 × 16 organization, operating from 2.7V to 5.5V, featuring 2 MHz clock rate at 5V, self-timed write cycle (≤10 ms), and 1 million write endurance. It is used in industrial control panels for parameter storage and calibration retention.
For engineers reviewing the AT93C56A-10TU-2.7-T datasheet, AT93C56A-10TU-2.7-T pinout, AT93C56A-10TU-2.7-T application, or AT93C56A-10TU-2.7-T equivalent, this page provides verified functional specifications, TSSOP-8 package details, real-world use scenarios, and validated alternative parts for design-in decisions under low-voltage industrial conditions.
Technical Context
The AT93C56A-10TU-2.7-T implements a synchronous three-wire interface (CS/SK/DI/DO) with ORG pin-controlled memory mapping, supporting sequential read and status-driven write completion detection via DO pin. Its instruction set includes READ, EWEN, ERASE, WRITE, ERAL, WRAL, and EWDS - all initiated by CS high and validated start bit "1".
It operates across −40°C to +85°C with standby current as low as 6.0 µA at 2.7V, input leakage ≤3.0 µA, and AC timing compliant to tSKH/tSKL ≥250 ns (2.7–5.5V). The device enters Erase/Write Disable state on power-up and requires explicit EWEN before programming - ensuring data integrity in noise-prone embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048 bits (256 × 8 or 128 × 16 organization selectable via ORG pin) |
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration into 3.3V and 5V logic domains without level-shifting |
| Max Clock Frequency | 2 MHz at VCC = 5V - supports fast configuration loading in boot-time sequences |
| Write Cycle Time | ≤10 ms (self-timed) - eliminates need for external timeout circuitry or polling overhead |
| Endurance & Retention | 1 million write cycles / 100-year data retention - suitable for field-updatable calibration tables |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade environmental stress without derating |
| Interface Protocol | Three-wire serial (CS/SK/DI/DO) - reduces PCB routing complexity vs. SPI or I²C |
Pinout & Package
AT93C56A-10TU-2.7-T is packaged in an 8-lead Thin Shrink Small Outline Package (TSSOP), 0.170" wide body, RoHS-compliant, with 0.65 mm lead pitch and exposed pad optional for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: initiates instruction decode and controls DO output impedance (high-Z when CS high) |
| SK | Serial Clock | Synchronizes all data transfers; rising edge clocks DI input and DO output |
| DI | Data Input | Receives start bit, op code, address, and write data; sampled on SK rising edge |
| DO | Data Output | Outputs read data or Ready/Busy status (logic 1 = ready, 0 = busy during write) |
| GND | Ground Reference | Return path for VCC and signal currents; must be low-impedance for noise immunity |
| VCC | Power Supply | 2.7V–5.5V supply; powers internal logic and charge pump for write/erase operations |
| ORG | Organization Select | High = 128 × 16 mode; low = 256 × 8 mode; unconnected defaults to x16 via internal 1 MΩ pull-up |
| NC | No Connect | Internally unused; must remain floating or tied to GND/VCC per layout guidelines - no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 256 × 8 or 128 × 16 layout via ORG pin - avoids firmware rework when memory width requirements change |
| Self-timed write cycle | No external delay or polling required; DO pin signals completion - simplifies host MCU firmware and reduces interrupt load |
| Low standby current | 6.0 µA at 2.7V - extends battery life in always-on industrial sensors and metering devices |
| Three-wire serial interface | Eliminates dedicated chip select per device in daisy-chain configurations - saves GPIOs and routing layers |
| Ready/Busy status reporting | DO pin outputs logic level indicating write progress - enables deterministic timing without fixed delays or blind waits |
| Industrial temperature range | −40°C to +85°C operation without derating - ensures reliability in factory automation and outdoor equipment |
Applications
| Industrial Control Panel | Smart Energy Meter |
|---|---|
Use Scenario: Storing calibration coefficients, tariff schedules, and firmware revision history in DIN-rail mounted PLC I/O modules. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with infrequent writes and frequent reads; accessed during power-up and parameter updates. Use Value: Enables field recalibration without firmware reflashing; retains settings across 10+ year deployments with zero maintenance. |
Use Scenario: Holding metering constants, tamper logs, and time-of-use billing parameters in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, low-power parameter store interfaced to metrology SoC via GPIO-banged serial protocol. Use Value: Meets IEC 62056-21 data retention requirements; withstands 1M+ write cycles from daily tariff updates. |
| Automotive Body Controller | Medical Diagnostic Device |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and error codes in 12V automotive body ECUs. IC Role / Device Role / Timing Role: Low-voltage EEPROM co-powered with 3.3V LDO; accessed during ignition-on initialization and user input events. Use Value: Operates reliably down to 2.7V during cold-crank transients; supports AEC-Q100 Class 2 qualification path. |
Use Scenario: Storing sensor calibration offsets, usage counters, and regulatory audit trails in portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Tamper-resistant configuration memory with write-protection via EWDS instruction after commissioning. Use Value: Ensures FDA 21 CFR Part 11 compliance through deterministic write disable and 100-year data retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT93C56B-10TU-2.7-T | Successor with enhanced ESD rating (4 kV HBM), same pinout and instruction set; not recommended for new design per 2012 revision notice | Identical functional replacement but superseded; limited long-term availability | Select only if legacy compatibility with AT93C56A firmware and layout is mandatory |
| M95256-DWMT3TG/K | 256 Kbit SPI EEPROM (32K × 8), 2.5–5.5V, 20 MHz clock, WLCSP-8 package - higher density, faster interface, different protocol | Requires SPI host driver and PCB redesign; suited for designs needing >2K storage or higher throughput | Choose when migrating to SPI-based architecture or requiring >2K capacity with minimal footprint |
Compared with AT93C56A-10TU-2.7-T, AT93C56B-10TU-2.7-T offers identical functionality with improved robustness but discontinued status, while M95256-DWMT3TG/K delivers greater density and speed at the cost of interface and layout changes - making it suitable only for new designs targeting scalability.
Availability
AT93C56A-10TU-2.7-T is available at Aetrix Electronics and suitable for industrial control panels, smart energy meters, automotive body controllers, and medical diagnostic devices requiring stable component supply across extended product lifecycles.
Supply support for AT93C56A-10TU-2.7-T 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 acquired Atmel in 2016 and maintains full support for legacy Atmel serial EEPROMs, including documentation, validation, and long-term supply assurance.
The AT93C56A-10TU-2.7-T belongs to Microchip's legacy serial EEPROM family designed for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of AT93C56A-10TU-2.7-T and how is it selected?
The AT93C56A-10TU-2.7-T provides 2048 bits organized as either 256 × 8 or 128 × 16, selected by the ORG pin: tied to VCC for x16 mode, grounded for x8 mode. If left unconnected, the internal 1 MΩ pull-up selects x16 mode. This hardware-selectable configuration avoids firmware dependency and allows reuse across multiple board variants.
Does AT93C56A-10TU-2.7-T support sequential read, and how does it work?
Yes, AT93C56A-10TU-2.7-T supports sequential read: after a READ instruction, holding CS high causes automatic address increment and continuous data output on DO synchronized to SK rising edges. No dummy bit is inserted between words, enabling efficient bulk reads - critical for loading configuration blocks in boot firmware.
How is write completion signaled on AT93C56A-10TU-2.7-T?
AT93C56A-10TU-2.7-T signals write completion via the DO pin: when CS is brought high after initiating a WRITE, DO outputs logic 0 during the self-timed cycle (≤10 ms) and transitions to logic 1 when complete. This Ready/Busy status eliminates fixed delays and enables precise timing control in host firmware.
What is the purpose of the EWEN and EWDS instructions in AT93C56A-10TU-2.7-T?
EWEN (Erase/Write Enable) must be issued before any programming instruction (ERASE, WRITE, etc.) to exit the default Erase/Write Disable state at power-up. EWDS (Erase/Write Disable) locks out all programming commands afterward, protecting stored data from accidental overwrite - a key safety feature in field-deployed equipment using AT93C56A-10TU-2.7-T.
Is AT93C56A-10TU-2.7-T compatible with 1.8V systems?
No - AT93C56A-10TU-2.7-T is specified for 2.7V to 5.5V operation only. For 1.8V systems, Microchip offers the AT93C56A-10TU-1.8-T variant (not this part number); mixing voltage grades risks unreliable operation or damage due to insufficient internal charge pump headroom in AT93C56A-10TU-2.7-T.
AT93C56A-10TU-2.7-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 3-Wire Serial
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT93C56A-10TU-2.7-T FAQ
1.How can I place an order for AT93C56A-10TU-2.7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C56A-10TU-2.7-T 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 AT93C56A-10TU-2.7-T reliable?
The price and inventory of AT93C56A-10TU-2.7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C56A-10TU-2.7-T is usually 5 days.
3.What payment methods are accepted for AT93C56A-10TU-2.7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C56A-10TU-2.7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C56A-10TU-2.7-T?
AT93C56A-10TU-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C56A-10TU-2.7-T 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 AT93C56A-10TU-2.7-T?
For technical support, including AT93C56A-10TU-2.7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C56A-10TU-2.7-T requirements.
6.How does Aetrix verify that AT93C56A-10TU-2.7-T is sourced from the original manufacturer or authorized distributors?
All AT93C56A-10TU-2.7-T 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 AT93C56A-10TU-2.7-T meets industry standards.
7.What is the process for return or replacement of AT93C56A-10TU-2.7-T?
All AT93C56A-10TU-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT93C56A-10TU-2.7-T, 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 AT93C56A-10TU-2.7-T part is unused and in its original packaging.
Return procedure for AT93C56A-10TU-2.7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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