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Microchip Technology AT93C56B-XHM-T
- Part No.:
- AT93C56B-XHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT93C56B-XHM-T.pdf
- Description:
- IC EEPROM 2KBIT 3-WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,052
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Product details
Overview
AT93C56B-XHM-T from Microchip Technology is a 2-Kbit three-wire serial EEPROM with user-selectable x8/x16 organization (256 × 8 or 128 × 16), 1.7V–5.5V operation, industrial temperature range (−40°C to +85°C), and self-timed write cycle ≤5 ms. It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, space-constrained embedded design.
For engineers reviewing the AT93C56B-XHM-T datasheet, AT93C56B-XHM-T pinout, AT93C56B-XHM-T application, or AT93C56B-XHM-T equivalent, this page delivers verified electrical specs, validated pin functions, confirmed packaging (8-pad XDFN), real-world use scenarios, and two technically documented alternative parts for direct design evaluation.
Technical Context
The AT93C56B-XHM-T implements a synchronous three-wire interface (CS/SK/DI/DO) with ORG pin-controlled memory mapping, enabling runtime selection between 256-word × 8-bit or 128-word × 16-bit configurations. Its internal architecture includes a high-voltage generation circuit, address register with auto-increment, and output buffer supporting sequential read without inter-word dummy bits.
It features a Power-on Reset (POR) circuit with 1.5 V threshold and requires ≥100 µs delay after VCC stabilization before command acceptance. Write operations require explicit EWEN instruction, and Ready/Busy status is signaled via DO pin when CS is reasserted during tWP - no external polling or timeout logic needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2,048 bits (256 × 8 or 128 × 16), fixed capacity per device variant |
| Supply voltage | 1.7 V to 5.5 V - supports single-supply operation across battery, 3.3 V, and 5 V systems |
| Write endurance | 1,000,000 cycles - enables frequent calibration or logging without premature wear-out |
| Data retention | 100 years at 55°C - guarantees long-term firmware or configuration integrity in industrial deployments |
| Max clock frequency | 2 MHz at 4.5–5.5 V - delivers up to 250 kbps read/write throughput in 5 V systems |
| Write cycle time | ≤5 ms maximum - eliminates need for external timing control; fully self-timed |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade environmental stress without derating |
Pinout & Package
AT93C56B-XHM-T is packaged in an 8-pad XDFN (1.8 mm × 2.2 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is optional and may be left floating or connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: device enters active mode only when CS = HIGH; DO goes high-Z when CS = LOW |
| SK | Serial Data Clock | Rising-edge synchronized I/O: all data latched in on SK rising edge; DO outputs on same edge |
| DI | Serial Data Input | Receives start bit, opcode, address, and write data; no internal pull-up/pull-down |
| DO | Serial Data Output | Outputs read data or Ready/Busy status (logic '1' = ready, '0' = busy) when CS reasserted mid-write |
| GND | Ground reference | System return path for VCC and all I/O; must be low-impedance connection |
| ORG | Organization select | Tied to VCC → x16 mode (128 words); tied to GND → x8 mode (256 words); unconnected → defaults to x16 |
| NC | No connect | Pin 7 is internally unused; must remain unconnected on PCB |
| VCC | Power supply | Single supply input; POR activates at ≥1.5 V; slew rate limited to ≤0.1 V/µs for reliable reset |
Key Features
| Feature | Design Value |
|---|---|
| Three-wire serial interface | Reduces MCU GPIO count and PCB routing complexity vs. SPI/I²C; no chip-select arbitration required |
| User-selectable x8/x16 organization | Enables flexible byte- or word-oriented access without changing hardware; configured at power-up via ORG pin |
| Self-timed write cycle | Eliminates need for external write-complete polling or fixed delays; DO status feedback replaces timeout logic |
| Low-voltage operation (1.7 V) | Supports direct integration into energy-harvesting or coin-cell-powered devices without level-shifting |
| Industrial temperature rating | Validated operation across full −40°C to +85°C range - no derating or thermal margin planning required |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients, tariff tables, and firmware version metadata in utility-grade electricity meters. IC Role / Device Role / Timing Role: Nonvolatile configuration storage IC interfaced directly to metering SoC via three-wire bus; retains data during power loss and brownout events. Use Value: Enables field-upgradable calibration without EEPROM replacement; 100-year retention ensures lifetime accuracy compliance under IEC 62053 standards. |
Use Scenario: Holding I/O mapping, PID tuning parameters, and safety-critical startup defaults in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Dedicated parameter EEPROM co-located with main controller; accessed during boot and runtime via deterministic CS/SK timing. Use Value: Guarantees deterministic boot behavior and parameter persistence across 1M+ power cycles - critical for SIL2-certified control loops. |
| Medical Sensor Module Settings | Automotive Body Control Unit NVM |
Use Scenario: Saving sensor offset/gain trim values, patient profile presets, and diagnostic history logs in portable ECG or pulse oximeter modules. IC Role / Device Role / Timing Role: Low-power serial EEPROM operating from 1.8 V supply; accessed intermittently during sensor initialization or user setup. Use Value: 0.4 µA standby current at 1.7 V extends battery life; 1M endurance supports daily recalibration over 10+ year product lifecycle. |
Use Scenario: Storing seat position memory, mirror angle presets, and lighting configuration in automotive body control modules (BCM). IC Role / Device Role / Timing Role: Robust NVM element tolerant to automotive load-dump transients and wide ambient temperature swings. Use Value: Qualified to −40°C to +85°C and RoHS-compliant package meets AEC-Q200 stress test requirements for passenger compartment electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WMN6TP | 4-Mbit SPI interface (not three-wire); 2.5–5.5 V supply; 5 MHz max clock; SO8 package only | Requires SPI master peripheral and additional GPIO for CS; higher density but incompatible protocol stack | Select if system already uses SPI infrastructure and needs >2 Kbit capacity; not drop-in compatible due to interface and pinout mismatch |
| CAT93C56VI-GT3 | 2-Kbit three-wire EEPROM; identical x8/x16 organization; 1.8–5.5 V; SO8/TSSOP packages; 1 MHz max clock at 1.8 V | Same command set and timing model; lower max clock at low voltage; no XDFN option available | Choose for legacy SO8 footprint compatibility or where CAT's qualification pedigree (onsemi) is mandated; XDFN users must redesign layout |
Compared with M95256-WMN6TP and CAT93C56VI-GT3, the AT93C56B-XHM-T uniquely combines XDFN packaging, 1.7 V operation, and guaranteed 2 MHz performance at 5 V - making it optimal for new ultra-compact, low-voltage embedded designs requiring minimal board area and power.
Availability
AT93C56B-XHM-T is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and medical sensor module settings requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT93C56B-XHM-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability, longevity, and embedded-system integration.
The AT93C56B-XHM-T belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, space-constrained industrial and consumer applications requiring robust nonvolatile storage with minimal interface overhead.
FAQ
What is the exact memory organization of AT93C56B-XHM-T?
The AT93C56B-XHM-T provides 2,048 bits organized as either 256 words × 8 bits or 128 words × 16 bits, selected by the ORG pin state at power-up. When ORG is tied to VCC, x16 mode is active; when tied to GND, x8 mode is active. Unconnected ORG defaults to x16 via internal pull-up. This configuration is fixed per power cycle and cannot be changed dynamically.
Does AT93C56B-XHM-T support sequential read operations?
Yes, AT93C56B-XHM-T supports sequential read: after issuing a READ command and address, holding CS high causes automatic address increment and continuous data output on DO without inter-word dummy bits. This enables efficient bulk reads - for example, retrieving full calibration tables with minimal host CPU intervention and precise SK timing alignment.
What is the minimum VCC required for reliable operation of AT93C56B-XHM-T?
The AT93C56B-XHM-T operates reliably down to 1.7 V, as specified in its DC and AC operating range. At 1.7 V, maximum clock frequency is 250 kHz, and standby current is ≤1.0 µA. All functionality - including READ, WRITE, ERASE, and status reporting - is guaranteed across the full 1.7–5.5 V range, with appropriate timing adjustments per voltage grade.
How does the Ready/Busy status work on AT93C56B-XHM-T?
During a write or erase cycle, AT93C56B-XHM-T asserts Ready/Busy status on the DO pin when CS is brought high after being held low for ≥tCS (1000 ns at 1.7 V). A logic '1' indicates completion; logic '0' indicates ongoing operation. This eliminates need for fixed delays or polling loops - host can recheck status immediately after CS assertion with deterministic timing.
Is AT93C56B-XHM-T pin-compatible with AT93C56B-SSHM-T?
No, AT93C56B-XHM-T (8-pad XDFN) is not pin-compatible with AT93C56B-SSHM-T (8-lead SOIC). While both share identical pin functions (CS/SK/DI/DO/GND/ORG/NC/VCC), their physical layouts differ: XDFN uses bottom-side pads in 1.8×2.2 mm outline with 0.5 mm pitch, whereas SOIC uses gull-wing leads in 3.9×4.9 mm body with 1.27 mm pitch. PCB layout and stencil design must be redesigned for XDFN.
AT93C56B-XHM-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:
- Active
- Programmable:
- 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:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT93C56B-XHM-T FAQ
1.How can I place an order for AT93C56B-XHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C56B-XHM-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 AT93C56B-XHM-T reliable?
The price and inventory of AT93C56B-XHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C56B-XHM-T is usually 5 days.
3.What payment methods are accepted for AT93C56B-XHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C56B-XHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C56B-XHM-T?
AT93C56B-XHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C56B-XHM-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 AT93C56B-XHM-T?
For technical support, including AT93C56B-XHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C56B-XHM-T requirements.
6.How does Aetrix verify that AT93C56B-XHM-T is sourced from the original manufacturer or authorized distributors?
All AT93C56B-XHM-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 AT93C56B-XHM-T meets industry standards.
7.What is the process for return or replacement of AT93C56B-XHM-T?
All AT93C56B-XHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT93C56B-XHM-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 AT93C56B-XHM-T part is unused and in its original packaging.
Return procedure for AT93C56B-XHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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