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Microchip Technology 93C56AT-E/ST
- Part No.:
- 93C56AT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93C56AT-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,144
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Product details
Overview
93C56AT-E/ST 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 93C56AT-E/ST datasheet, 93C56AT-E/ST pinout, 93C56AT-E/ST application, or 93C56AT-E/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 2 ms typical write cycle time, 1 million endurance cycles, 200-year data retention, and compatibility with legacy Microwire controllers in space-constrained industrial modules.
Technical Context
The 93C56AT-E/ST implements a synchronous serial interface with CS, CLK, and DI/DO pins, requiring no external timing components. Its command set includes READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS - all executed via rising-edge clocked bit streams starting with a Start condition (CS high + DI high on CLK edge).
Unlike C-variant parts, this A-version device lacks an ORG pin and permanently operates in 256 × 8-bit mode. Write operations are initiated by the rising edge of CLK on the final data bit, and the DO pin transitions from High-Z to active-low Ready/Busy during programming - enabling polling without interrupt support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed organization; no ORG pin required for 8-bit bus alignment |
| VCC range | 4.5 V to 5.5 V - compatible with 5 V logic systems; POR threshold at 3.8 V ensures reliable power-up initialization |
| Write cycle time | 2 ms max - self-timed; eliminates need for external delay circuitry or software timeout tuning |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in telemetry or calibration applications |
| Data retention | 200 years at 25°C - suitable for long-lifecycle industrial equipment without battery-backed RAM |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware |
| Temp range | −40°C to +85°C (Industrial grade) - validated for use in motor drives, PLC I/O modules, and outdoor metering |
Pinout & Package
8-lead TSSOP package (ST suffix), 3.0 mm × 4.4 mm body, 0.65 mm pitch. Pin 1 marked by laser dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; deselects device into standby but completes ongoing write |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer; no clocks needed during self-timed write |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied high with CS to initiate instruction |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status read |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; requires low-impedance connection to minimize noise coupling |
| 6 (NC) | No Connect | Internally unconnected; must remain floating or grounded per layout best practice - no routing or loading |
| 7 (NC) | No Connect | Same as Pin 6; dual NC pins provide mechanical stability and reduce crosstalk in TSSOP layout |
| 8 (VCC) | Power Supply | 4.5–5.5 V input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable erase/write |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; 2 ms max cycle enables deterministic firmware flow without polling overhead |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial writes and data corruption on power loss |
| Power-on/off data protection | Hardware-level lockout below 3.8 V VCC prevents inadvertent writes during brown-out or hot-swap events |
| Ready/Busy status on DO | Enables efficient polling-based write completion detection without dedicated interrupt lines or extra GPIO |
| Sequential read mode | Reduces command overhead: holding CS high auto-increments address and outputs 256 bytes continuously |
Applications
| Industrial Sensor Calibration Storage | Legacy MCU Configuration Memory |
|---|---|
Use Scenario: Storing temperature-compensation coefficients and offset values for analog sensor front-ends in factory automation nodes. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at boot and during field recalibration; retains data across 10+ year deployments. Use Value: Eliminates need for battery-backed SRAM; 200-year retention and 1M-cycle endurance support lifetime recalibration without replacement. | Use Scenario: Holding bootloader configuration flags, communication protocol settings, and security keys in 8-bit microcontroller-based HVAC controllers. IC Role / Device Role / Timing Role: Microwire-compatible serial EEPROM interfaced directly to legacy PIC16 or 8051 derivatives with minimal GPIO usage. Use Value: Fixed 8-bit organization matches native bus width; 5 V operation avoids level-shifting; TSSOP package fits compact PCB footprints. |
| Smart Meter Firmware Parameter Backup | Motor Drive Fault Log Storage |
Use Scenario: Archiving tariff tables, demand-response schedules, and tamper-event timestamps in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, infrequently written memory partition isolated from main flash; accessed only during firmware update or utility command execution. Use Value: Hardware write-protection (EWDS/EWEN) prevents accidental overwrite; 4.5–5.5 V range aligns with meter's regulated 5 V rail. | Use Scenario: Recording overcurrent events, thermal shutdowns, and encoder error codes in servo drive control boards for predictive maintenance. IC Role / Device Role / Timing Role: Circular buffer implemented in EEPROM; new entries overwrite oldest after 256 fault records. Use Value: 1M endurance exceeds typical field life; sequential read simplifies log retrieval; TSSOP withstands reflow and vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56AT-I/ST | Wider VCC range (2.5–5.5 V); same 256 × 8-bit organization and TSSOP-8 package | Supports mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripherals); lower VCC min enables battery-powered operation | Select if design uses sub-4.5 V supply or requires broader voltage margin; pinout and timing identical |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit (256 × 8), 1.8–5.5 V, 5 ms write time, SOIC-8 package | Requires SPI master instead of Microwire; higher write latency; different command structure and status reporting | Choose only if migrating to SPI architecture; not drop-in - firmware and layout changes required |
Compared with 93LC56AT-I/ST, the 93C56AT-E/ST offers tighter VCC regulation immunity above 4.5 V but lacks low-voltage flexibility; versus AT25020B-SSHL-T, it preserves Microwire compatibility and faster write timing but requires different driver code and lacks SPI standardization.
Availability
93C56AT-E/ST is available at Aetrix Electronics and suitable for industrial sensor calibration storage, legacy MCU configuration memory, and smart meter firmware parameter backup requiring stable component supply across extended production lifecycles.
Supply support for 93C56AT-E/ST 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx series was designed specifically for cost-sensitive, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components and legacy interface support.
FAQ
What is the memory organization of the 93C56AT-E/ST?
The 93C56AT-E/ST is a fixed 256 × 8-bit (2 Kbit) EEPROM with no ORG pin - unlike C-variant parts, it does not support 16-bit mode. This simplifies hardware design by eliminating external ORG logic and guarantees byte-aligned access for 8-bit microcontrollers. The device always operates in x8 mode, making it ideal for systems where memory mapping and firmware drivers assume 8-bit word width.
Does the 93C56AT-E/ST require an external pull-up resistor on the DO pin?
No, the 93C56AT-E/ST does not require an external pull-up on DO. The pin actively drives high/low during Read and Ready/Busy status reporting, and enters High-Z when inactive. However, if DI and DO are shorted (common-bus configuration), a current-limiting resistor (e.g., 10 kΩ) is recommended between them to prevent bus conflict during the dummy zero phase of Read operations - as specified in DS21794G Section 2.2.
How is write protection implemented on the 93C56AT-E/ST?
Write protection on the 93C56AT-E/ST is enforced through hardware-level Erase/Write Disable (EWDS) state at power-up and explicit EWEN/EWDS command sequencing. The device powers up in EWDS mode; an EWEN instruction must precede any ERASE or WRITE. After programming, issuing EWDS disables further writes until next power cycle or another EWEN. This prevents accidental overwrites during noise events or firmware glitches without relying solely on software flags.
What is the minimum VCC required for reliable operation of the 93C56AT-E/ST?
The 93C56AT-E/ST requires VCC ≥ 4.5 V for full specification compliance, with a power-on reset (POR) threshold at 3.8 V. Below 4.5 V, functions like ERAL and WRAL are not guaranteed - DS21794G Table 1-1 specifies VPOR = 3.8 V for '93C' devices. Operating outside 4.5–5.5 V may result in incomplete writes, failed status polling, or data corruption; designs must ensure stable 5 V rail with adequate decoupling.
Can the 93C56AT-E/ST be used in automotive applications?
No, the 93C56AT-E/ST is rated for Industrial temperature range (−40°C to +85°C), not Automotive (−40°C to +125°C). Its part number suffix 'E' denotes Automotive-grade *availability* for other variants (e.g., 93C56BT-E/ST), but the 'T-E/ST' suffix here indicates Industrial temp with TSSOP package - confirmed by Device Selection Table and DS21794G-page 2. For AEC-Q100-compliant designs, Microchip's 93C56BT-E/ST or automotive-qualified serial EEPROMs must be selected instead.
93C56AT-E/ST 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:
- 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-TSSOP
93C56AT-E/ST FAQ
1.How can I place an order for 93C56AT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C56AT-E/ST 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/ST reliable?
The price and inventory of 93C56AT-E/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 93C56AT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C56AT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C56AT-E/ST?
93C56AT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C56AT-E/ST 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/ST?
For technical support, including 93C56AT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C56AT-E/ST requirements.
6.How does Aetrix verify that 93C56AT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93C56AT-E/ST 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/ST meets industry standards.
7.What is the process for return or replacement of 93C56AT-E/ST?
All 93C56AT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93C56AT-E/ST, 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/ST part is unused and in its original packaging.
Return procedure for 93C56AT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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