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Microchip Technology 93LC56C-E/ST
- Part No.:
- 93LC56C-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56C-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,943
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Product details
Overview
93LC56C-E/ST from Microchip Technology Inc. is a 2 Kbit low-voltage serial EEPROM with configurable 8-/16-bit word organization via the ORG pin, 2.5–5.5 V supply range, -40°C to +125°C automotive temperature grade, and industry-standard 3-wire Microwire-compatible interface. It delivers 1 million erase/write cycles and >200 years data retention for nonvolatile storage in automotive control modules.
For engineers reviewing the 93LC56C-E/ST datasheet, 93LC56C-E/ST pinout, 93LC56C-E/ST application, or 93LC56C-E/ST equivalent, key selection criteria include ORG-pin-configurable memory width, automotive-grade reliability, self-timed erase/write with ERAL/WRAL support, Ready/Busy status signaling, and compatibility with legacy Microwire host controllers.
Technical Context
The 93LC56C-E/ST implements a synchronous 3-wire serial interface (CS, CLK, DI/DO) with start-bit detection and opcode-driven command set. Memory organization is dynamically selected: ORG = VSS enables 256 × 8-bit mode; ORG = VCC enables 128 × 16-bit mode. All operations - READ, WRITE, ERASE, ERAL, WRAL - are initiated by clocked instruction sequences followed by auto-erase-and-program cycles.
Power-on/off data protection is enforced via internal voltage monitoring (VPOR = 1.5 V typical), and write security is managed through EWEN/EWDS commands. The DO pin serves dual function: serial data output during READ and Ready/Busy status indicator during programming - active-high when ready, low during active erase/write.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit or 128 × 16-bit, selectable via ORG pin) |
| VCC range | 2.5 V to 5.5 V - supports wide-input industrial and automotive power rails |
| Temperature grade | Automotive (E): -40°C to +125°C - qualified for under-hood and safety-critical systems |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware parameter updates |
| Data retention | >200 years at 25°C - ensures long-term calibration and configuration storage |
| Write cycle time | 6 ms max (TWC) - deterministic timing for real-time system scheduling |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage on microcontrollers |
| Package | 8-lead TSSOP (ST) - surface-mount footprint with 0.65 mm pitch, RoHS-compliant matte tin finish |
Pinout & Package
8-lead TSSOP (ST) package with exposed pad option; Pb-free matte tin finish; pin 1 marked by laser dot; standard JEDEC MO-153 variant.
| 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 on rising edge; stoppable at any level; no clocks required during self-timed write |
| 3 DI | Data Input | Accepts start bit, opcode, address, and write data; may share trace with DO if series resistor used to prevent bus conflict |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters high-Z on CS falling edge |
| 5 VSS | Ground | Reference for all I/O and internal logic; connects to PCB ground plane |
| 6 ORG | Organization Select | Logic high → 128 × 16-bit mode; logic low → 256 × 8-bit mode; must be externally biased - not NC on 'C' variants |
| 7 NC | No Internal Connection | Unbonded pin; must remain floating or tied to VSS/VCC per layout best practice |
| 8 VCC | Power Supply | 2.5–5.5 V input; internal POR circuit disables writes below ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single BOM for both 8-bit and 16-bit host systems without redesigning firmware or PCB |
| Self-timed erase/write with auto-erase | Eliminates need for external timing control or polling delays beyond TWC/TEC/TWL max values |
| ERAL and WRAL commands | Supports full-array initialization in one instruction - critical for factory provisioning and recovery modes |
| Ready/Busy status on DO | Allows efficient polling without additional pins; avoids fixed-delay waits in time-constrained applications |
| EWEN/EWDS write protection | Prevents accidental overwrites during power transients or software faults; powers up in locked (EWDS) state |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR, ensuring integrity during brown-out or hot-swap events |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim tables, fault codes, and sensor calibration offsets subject to frequent field updates. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to MCU's Microwire peripheral; accessed during boot and runtime reconfiguration. Use Value: 1M endurance supports >10 years of daily recalibration; automotive temp grade ensures operation across engine bay thermal extremes. | Use Scenario: Retaining camera lens focus profiles, radar beamforming coefficients, and collision avoidance thresholds. IC Role / Device Role / Timing Role: Dedicated parameter store for vision/radar SoCs; accessed via dedicated SPI-like controller with minimal pin count. Use Value: ORG-selectable word width matches native data paths of ADAS processors; >200-year retention preserves safety-critical settings over vehicle lifetime. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Holding user preferences (window position, mirror angle, seat memory) and door lock configuration states. IC Role / Device Role / Timing Role: Low-power serial EEPROM sharing bus with other peripherals; accessed intermittently during wake-up events. Use Value: 2.5 V min VCC enables operation during battery cranking; standby current <5 µA minimizes parasitic drain. | Use Scenario: Storing torque sensor zero-point compensation, motor phase alignment data, and fail-safe steering maps. IC Role / Device Role / Timing Role: Safety-relevant nonvolatile memory with hardware write protection (EWEN/EWDS) and POR enforcement. Use Value: Automotive qualification and deterministic 6 ms write time meet ASIL-B functional safety timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B-E/ST | Dedicated 128 × 16-bit organization; no ORG pin - fixed 16-bit interface | Requires 16-bit host interface; eliminates ORG biasing complexity but lacks flexibility | Select when system exclusively uses 16-bit data paths and board space permits fixed-organization part |
| AT25DF021-SSH-T | 2 Mbit SPI NOR Flash; sector erase; no built-in ERAL/WRAL; requires external command sequencing | Higher density but slower random-write performance; lacks hardware write-protection and automatic erase-before-write | Choose only if >2 Kbit capacity is needed and host firmware can manage erase granularity and wear leveling |
Compared with 93LC56B-E/ST, the 93LC56C-E/ST adds ORG-pin configurability for mixed-host environments; compared with AT25DF021-SSH-T, it offers guaranteed 1M endurance, deterministic 6 ms writes, and integrated ERAL/WRAL - making it superior for small-parameter, high-reliability automotive storage.
Availability
93LC56C-E/ST is available at Aetrix Electronics and suitable for automotive control units, ADAS subsystems, and body electronics requiring stable component supply across extended product lifecycles.
Supply support for 93LC56C-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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC56C-E/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count nonvolatile storage in automotive and industrial systems where reliability, wide VCC range, and Microwire compatibility are essential.
FAQ
What is the function of the ORG pin on the 93LC56C-E/ST?
The ORG pin on the 93LC56C-E/ST selects memory organization: tied to VCC it configures the device as 128 × 16-bit; tied to VSS it configures as 256 × 8-bit. This pin is functional only on 'C' variants like the 93LC56C-E/ST - it is NC on 'A' and 'B' versions. Proper biasing is mandatory for reliable operation; floating the ORG pin is not permitted.
Does the 93LC56C-E/ST support automatic erase before write?
Yes, the 93LC56C-E/ST performs automatic erase before each WRITE or ERASE operation - no separate erase command is needed for single-location writes. The self-timed cycle completes in ≤6 ms (TWC). Full-array erase is also supported via the ERAL command, which requires VCC ≥4.5 V and executes in ≤6 ms (TEC).
How is Ready/Busy status monitored on the 93LC56C-E/ST?
Ready/Busy status is signaled on the DO pin: logic low indicates an erase or write operation is in progress; logic high indicates completion and readiness for the next command. To sample status, CS must be brought high for ≥250 ns after the initial CS low pulse (TCSL). The DO pin returns to high-Z on CS falling edge.
What is the maximum clock frequency supported by the 93LC56C-E/ST at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC56C-E/ST supports a maximum clock frequency of 2 MHz (per Table 1-2, A1). Clock high/low times must meet TCKH ≥200 ns and TCKL ≥100 ns respectively. These AC limits ensure reliable setup/hold timing for opcode, address, and data bits.
Is the 93LC56C-E/ST pin-compatible with the 93LC56A-E/ST?
No - the 93LC56C-E/ST and 93LC56A-E/ST are not pin-compatible. The 93LC56C-E/ST uses pin 6 for ORG functionality, whereas the 93LC56A-E/ST has NC at pin 6. Swapping them without modifying the ORG bias network will cause undefined memory organization behavior or communication failure. Board-level redesign is required for substitution.
93LC56C-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC56C-E/ST FAQ
1.How can I place an order for 93LC56C-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56C-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 93LC56C-E/ST reliable?
The price and inventory of 93LC56C-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 93LC56C-E/ST is usually 5 days.
3.What payment methods are accepted for 93LC56C-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56C-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56C-E/ST?
93LC56C-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56C-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 93LC56C-E/ST?
For technical support, including 93LC56C-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56C-E/ST requirements.
6.How does Aetrix verify that 93LC56C-E/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56C-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 93LC56C-E/ST meets industry standards.
7.What is the process for return or replacement of 93LC56C-E/ST?
All 93LC56C-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56C-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 93LC56C-E/ST part is unused and in its original packaging.
Return procedure for 93LC56C-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56C-E/ST Tags
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AT24C02C-XHM-T
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