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Microchip Technology AT93C56B-SSHM-B
- Part No.:
- AT93C56B-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C56B-SSHM-B.pdf
- Description:
- IC EEPROM 2KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,324
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Product details
Overview
AT93C56B-SSHM-B from Microchip Technology is a 2-Kbit three-wire serial EEPROM with user-selectable 256 × 8 or 128 × 16 organization, operating from 1.7V to 5.5V, rated for -40°C to +85°C, and featuring self-timed write cycles ≤5 ms. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules.
For engineers reviewing the AT93C56B-SSHM-B datasheet, AT93C56B-SSHM-B pinout, AT93C56B-SSHM-B application, or AT93C56B-SSHM-B equivalent, key selection considerations include voltage range compatibility (1.7–5.5 V), x8/x16 organization flexibility via ORG pin, SOIC-8 package footprint, and guaranteed 1M write cycles with 100-year data retention.
Technical Context
The AT93C56B-SSHM-B implements a synchronous three-wire interface (CS/SK/DI/DO) with rising-edge clocking on SK and supports sequential read, ERASE, WRITE, WRAL, and ERAL commands. Its internal organization is dynamically selected by the ORG pin state-tied to VCC for 128 × 16 mode or GND for 256 × 8 mode.
It integrates a power-on reset (POR) circuit with VPOR ≤1.5 V and requires ≥100 µs stable VCC before first command. Write operations require prior EWEN instruction and are self-timed with tWP = 0.1–5 ms; DO pin provides Ready/Busy status when CS is reasserted during active programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2,048 bits (256 × 8 or 128 × 16), fixed capacity for compact configuration storage |
| Supply voltage | 1.7 V to 5.5 V - enables direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V logic systems |
| Clock frequency | Up to 2 MHz at 4.5–5.5 V - supports high-speed serial access without external timing components |
| Write endurance | 1,000,000 cycles - ensures long-term reliability in firmware update or calibration logging applications |
| Data retention | 100 years at 55 °C - guarantees persistent storage across product lifecycles in industrial environments |
| Operating temperature | -40 °C to +85 °C - qualified for use in uncontrolled ambient industrial and automotive under-hood locations |
| Package | 8-lead SOIC (3.9 mm body) - standard surface-mount footprint compatible with automated assembly and legacy PCB layouts |
Pinout & Package
AT93C56B-SSHM-B uses an 8-lead SOIC package (Microchip drawing C04-057-SN) with 1.27 mm pitch, 3.90 mm body width, and JEDEC-standard pin 1 index. Pin 1 is CS; pins 2–8 follow standard SOIC numbering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable: device enters standby (high-Z DO) when low; required to initiate all commands |
| SK (Pin 2) | Serial Data Clock | Rising-edge synchronized I/O: latches DI and clocks DO; max 2 MHz at 5 V |
| DI (Pin 3) | Serial Data Input | Accepts start bit, opcode, address, and data; sampled on SK rising edge |
| DO (Pin 4) | Serial Data Output | Outputs read data or Ready/Busy status (logic 1 = ready, 0 = busy) after tSV delay |
| GND (Pin 5) | Ground reference | System return path for VCC and signal currents; must be low-impedance connection |
| ORG (Pin 6) | Organization select | High = 128 × 16 mode; low = 256 × 8 mode; open = default x16 via internal pull-up |
| NC (Pin 7) | No connect | Internally unused; must be left floating or tied to GND/VCC per layout constraints - no electrical function |
| VCC (Pin 8) | Power supply | Single 1.7–5.5 V rail powers logic and EEPROM array; POR activates below 1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable x8 or x16 word width via ORG pin - eliminates software remapping in host firmware |
| Low-voltage operation down to 1.7 V | Enables direct integration into battery-powered or energy-harvesting systems without level-shifting |
| Self-timed write cycle ≤5 ms | Removes need for external write-complete polling or timeout logic in host controller design |
| Ready/Busy status on DO pin | Allows real-time monitoring of erase/write progress without dedicated status registers or interrupts |
| 100-year data retention at 55 °C | Validated for long-life deployments in sealed industrial enclosures where replacement is impractical |
| Green RoHS-compliant packaging | Lead-free, halide-free SOIC meets global environmental compliance requirements for commercial and industrial shipments |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing I/O mapping tables and sensor calibration coefficients in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent settings that survive power loss and system resets. Use Value: Enables field-replaceable module interoperability and zero-configuration startup after maintenance cycles. |
Use Scenario: Retaining patient-specific therapy parameters and transducer gain offsets in portable infusion pumps certified to IEC 62304. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault accessed only during device initialization or service mode. Use Value: Meets regulatory requirement for deterministic data persistence across 10+ year product lifetimes. |
| Automotive Body Control Module (BCM) | Consumer Appliance User Preference Memory |
|
Use Scenario: Saving seat/mirror position presets and lighting profiles in 12 V automotive BCMs operating across cold cranking (-40 °C) to engine bay heat (+85 °C). IC Role / Device Role / Timing Role: Low-power serial NV memory interfaced directly to 5 V MCU GPIOs without voltage translation. Use Value: Eliminates need for external regulators or level shifters while maintaining AEC-Q200 stress margins. |
Use Scenario: Recording wash cycle selections, spin speed preferences, and language settings in smart washing machines with 3.3 V main controllers. IC Role / Device Role / Timing Role: Cost-optimized configuration store supporting frequent writes during user interaction and infrequent reads during boot. Use Value: Delivers 1M-cycle endurance at <10 µA standby current - extends battery backup life in AC-loss scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DFMN6TP | 4-Kbit SPI interface, 8-pin SOIC, 2.5–5.5 V, 5 MHz clock, no ORG pin - fixed 32K × 8 organization | Requires SPI master support; lacks hardware organization selection; higher density but no x16 mode | Select when migrating to SPI infrastructure or requiring >2 Kbit capacity without redesigning address logic. |
| CAT93C56VI-GT3 | 2-Kbit 3-wire interface, SOIC-8, 1.8–5.5 V, 2 MHz, same x8/x16 ORG functionality, but 100k write cycles and 40-year retention | Lower endurance and retention spec; identical pinout and command set; RoHS compliant | Acceptable for cost-sensitive consumer designs where 100k cycles suffice and 40-year retention is adequate. |
Compared with M95256-DFMN6TP and CAT93C56VI-GT3, AT93C56B-SSHM-B uniquely balances 1.7 V operation, 1M-cycle endurance, and hardware-selectable organization - making it optimal for industrial designs requiring wide voltage tolerance and long-term field reliability without SPI dependency.
Availability
AT93C56B-SSHM-B is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body control modules, and consumer appliance control boards requiring stable component supply across multi-year production runs.
Supply support for AT93C56B-SSHM-B 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified global manufacturing and design centers.
AT93C56B-SSHM-B belongs to Microchip's legacy AT93CxxB serial EEPROM product line, engineered for robust, low-power nonvolatile storage in space-constrained industrial and automotive control systems.
FAQ
What is the memory organization of AT93C56B-SSHM-B?
The AT93C56B-SSHM-B supports two configurations: 256 words × 8 bits or 128 words × 16 bits. The ORG pin determines selection - tied to VCC for x16 mode, GND for x8 mode. If left unconnected, the internal 10 MΩ pull-up defaults to x16 organization. This hardware-selectable structure avoids firmware overhead in host MCU drivers.
Does AT93C56B-SSHM-B require external circuitry for write completion detection?
No. AT93C56B-SSHM-B provides Ready/Busy status directly on the DO pin: logic '1' indicates completion, logic '0' indicates active erase/write. This occurs when CS is reasserted after tCS minimum low time. No external polling timer or interrupt handler is needed - simplifying host firmware and reducing CPU load during configuration updates.
What is the maximum clock frequency supported by AT93C56B-SSHM-B at 3.3 V?
At 3.3 V supply, AT93C56B-SSHM-B supports up to 1 MHz clock frequency on the SK pin, as specified in Table 4-3 of the datasheet. This is lower than the 2 MHz maximum at 4.5–5.5 V but sufficient for most configuration storage tasks in 3.3 V embedded systems without compromising timing margin or signal integrity.
Can AT93C56B-SSHM-B operate reliably at 1.8 V?
Yes. AT93C56B-SSHM-B is fully specified for 1.7 V to 5.5 V operation, including reliable read/write functionality at 1.8 V. At this voltage, clock frequency is limited to 250 kHz, standby current is ≤1.0 µA, and write cycle time remains ≤5 ms - enabling use in ultra-low-power battery-backed applications such as smart meters and IoT edge sensors.
Is AT93C56B-SSHM-B pin-compatible with older AT93C56 versions?
Yes. AT93C56B-SSHM-B maintains identical SOIC-8 pinout, electrical characteristics, and command set with legacy AT93C56 variants (e.g., AT93C56-10SU-2.7). The 'B' suffix denotes enhanced reliability and extended voltage range; no PCB or firmware changes are required for drop-in replacement in existing designs using the original AT93C56.
AT93C56B-SSHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SOIC
AT93C56B-SSHM-B FAQ
1.How can I place an order for AT93C56B-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C56B-SSHM-B 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-SSHM-B reliable?
The price and inventory of AT93C56B-SSHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C56B-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT93C56B-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C56B-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C56B-SSHM-B?
AT93C56B-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C56B-SSHM-B 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-SSHM-B?
For technical support, including AT93C56B-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C56B-SSHM-B requirements.
6.How does Aetrix verify that AT93C56B-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT93C56B-SSHM-B 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-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT93C56B-SSHM-B?
All AT93C56B-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT93C56B-SSHM-B, 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-SSHM-B part is unused and in its original packaging.
Return procedure for AT93C56B-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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