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Microchip Technology 93LC56X/SN
- Part No.:
- 93LC56X/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56X/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,842
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Product details
Overview
93LC56X/SN from Microchip Technology Inc. is a 2 Kbit (256 × 8 or 128 × 16) low-voltage serial EEPROM with Microwire™ interface, ORG-pin-selectable memory organization, and industrial temperature range (–40°C to +85°C). It operates down to 2.5 V, features self-timed erase/write cycles, and delivers 100 µA typical active read current at 2.5 V for battery-sensitive embedded systems.
For engineers reviewing the 93LC56X/SN datasheet, 93LC56X/SN pinout, 93LC56X/SN application, or 93LC56X/SN equivalent, this page provides verified functional specifications, rotated SOIC package details, real-world timing behavior, and validated alternative options for legacy design continuity and supply chain resilience.
Technical Context
The 93LC56X/SN implements a synchronous 3-wire Microwire interface (CS/CLK/DI/DO) with start-bit detection and opcode-driven command execution. Its dual-organization architecture (x8/x16) is determined solely by the logic level on the ORG pin at power-up, with no internal configuration register.
It uses self-timed internal programming logic that automatically performs erase-before-write (ERAL before WRAL), supports sequential read, and asserts Ready/Busy status via DO pin polling during erase/write operations - all without requiring external timing control or additional control lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 or 128 × 16), selectable via ORG pin - enables flexible data-width alignment in microcontroller firmware |
| Supply voltage | 2.5 V to 5.5 V - supports direct interfacing with 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| Interface | Microwire™ 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage; compatible with legacy PIC® MCU peripheral modules |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in frequent parameter storage applications (e.g., calibration, counters) |
| Data retention | >200 years at 25°C - suitable for unattended equipment with multi-decade service life requirements |
| Write cycle time | 4 ms per word (typical) - predictable latency for deterministic firmware timing budgets |
| Operating current | 100 µA typical read current at 2.5 V - critical for ultra-low-power wake-on-event designs |
Pinout & Package
93LC56X/SN is supplied in an 8-lead rotated SOIC (SN) package per JEDEC MS-012, with pin 1 located at the bottom-right corner when the notch faces up - distinct from standard SOIC orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 3) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state and prevent spurious commands |
| CLK (Pin 4) | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer without loss of state - simplifies software bit-banging |
| DI (Pin 5) | Data Input | Accepts start bit, opcode, address, and write data; high-Z when not selected - allows shared bus with pull-up |
| DO (Pin 6) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); requires external pull-up for reliable status polling after erase/write |
| VSS (Pin 7) | Ground | Reference return path; must be connected before VCC to ensure proper power-on reset behavior |
| ORG (Pin 8) | Organization Select | High = x16 mode (128 words), low = x8 mode (256 bytes); floating only allowed ≤1 MHz in x16 mode |
| NU (Pin 1) | No Connect | Not internally bonded; must remain unconnected - routing to ground or VCC causes undefined operation |
| VCC (Pin 2) | Power Supply | 2.5–5.5 V input; internal power-on protection inhibits programming until VCC >1.4 V - prevents corruption during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin memory configuration | Hardware-selectable x8/x16 organization eliminates firmware branching overhead and reduces code footprint |
| Self-timed erase/write | Removes need for external timing components or delay loops - simplifies driver implementation and improves portability |
| Power-on/off data protection | Automatic inhibit below 1.4 V prevents accidental writes during power ramp - essential for robust field deployment |
| Sequential read function | Enables burst reads across consecutive addresses with single CS assertion - cuts transaction overhead by ~40% vs. random access |
| RDY/BSY status via DO | Allows non-blocking polling instead of fixed delays - improves system responsiveness and CPU utilization efficiency |
Applications
| Industrial Sensor Calibration Storage | Consumer Remote Control Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and runtime recalibration; interfaces via dedicated Microwire peripheral on Cortex-M0+ MCU. Use Value: 200-year data retention ensures calibration integrity over full product lifecycle without periodic reprogramming. | Use Scenario: Holding IR code mappings, button remapping preferences, and backlight brightness settings in universal remote controls. IC Role / Device Role / Timing Role: Low-power configuration memory powered directly from coin cell; accessed infrequently but must survive 10+ years of shelf life. Use Value: 100 µA active current at 2.5 V extends battery life beyond 5 years under typical usage patterns. |
| Medical Device Usage Log | Automotive Body Control Module Settings |
Use Scenario: Recording cumulative operating hours, error event timestamps, and firmware update history in portable diagnostic tools. IC Role / Device Role / Timing Role: Write-once-per-session logging device; uses WRAL to atomically update status blocks after each clinical session. Use Value: 1M endurance supports >270 years of daily logging at one write per day - exceeds regulatory traceability requirements. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles tied to key fob IDs in entry-level vehicles. IC Role / Device Role / Timing Role: Parameter EEPROM interfaced to 8-bit automotive MCU via bit-banged Microwire; survives –40°C to +85°C ambient. Use Value: Industrial temperature grade and 2.5 V minimum operation ensure reliable function during cold cranking and under-hood thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56C-I/SN | Pin-compatible successor with enhanced ESD rating (≥6 kV HBM), improved write-cycle consistency, and updated qualification per AEC-Q200 Grade 2 | Approved for new automotive designs; supports higher-reliability requirements in safety-critical subsystems | Select 93LC56C-I/SN for new designs requiring extended qualification, while retaining identical layout and firmware |
| AT25020B-MAHL-T | 2 Kbit SPI EEPROM (not Microwire); 1.8–5.5 V supply; 5 MHz max clock; no ORG pin - fixed 256 × 8 organization | Requires SPI interface and revised command set; lacks hardware organization select but offers faster clock rate | Choose AT25020B-MAHL-T when migrating to SPI-based platforms or when higher throughput justifies firmware adaptation |
Compared with 93LC56X/SN, the 93LC56C-I/SN offers drop-in replacement with superior robustness for production ramp, whereas the AT25020B-MAHL-T trades Microwire compatibility for SPI ecosystem alignment and speed - both require validation against timing margins and voltage rail stability.
Availability
93LC56X/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, consumer remote control configuration, and medical device usage log applications requiring stable component supply and long-term obsolescence management.
Supply support for 93LC56X/SN 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products for embedded control applications.
The 93LC56X/SN belongs to Microchip's legacy Microwire EEPROM family, designed specifically for cost-sensitive, low-power, and space-constrained systems where simple 3-wire communication and hardware-configurable memory width are prioritized over high-speed serial protocols.
FAQ
What is the correct pin 1 location for 93LC56X/SN?
The 93LC56X/SN uses a rotated SOIC (SN) package where pin 1 is at the bottom-right corner when the package notch faces upward - unlike standard SOIC. This rotation aligns CS to pin 3 and VCC to pin 2. Misidentifying pin 1 causes immediate communication failure, so always verify orientation using the Microchip package drawing C04-057 before PCB layout.
Can the ORG pin of 93LC56X/SN be left floating?
The ORG pin of 93LC56X/SN may be floated only when operating at clock frequencies ≤1 MHz and in x16 mode; otherwise, it must be hard-wired to VCC (x16) or VSS (x8). Floating ORG at higher frequencies risks metastability and unpredictable memory mapping - always tie ORG with a 10 kΩ pull-up or pull-down resistor in production designs.
How does the 93LC56X/SN indicate readiness after a write operation?
The 93LC56X/SN signals readiness via the DO pin: logical high indicates completion, low indicates ongoing erase/write. To poll correctly, bring CS high for ≥250 ns after initiating the command, then sample DO - a pull-up resistor is mandatory for valid high-state reading. Relying on fixed delays instead of DO polling risks premature access and data corruption.
Is 93LC56X/SN compatible with modern 3.3 V microcontrollers?
Yes, 93LC56X/SN is fully compatible with 3.3 V microcontrollers: its VIH1 threshold is 2.0 V minimum (VCC ≥2.7 V), and VOL2 is ≤0.3 V at 100 µA load - well within 3.3 V logic margins. No level shifting is required, but ensure the MCU's DI output drive strength meets 93LC56X/SN's 10 µA input leakage limit.
Why does 93LC56X/SN require an EWEN instruction before writing?
The 93LC56X/SN powers up in Erase/Write Disable (EWDS) mode to prevent accidental writes during power transients. An EWEN instruction must precede any ERASE or WRITE command - this is a hardware-enforced safety mechanism. Omitting EWEN results in silent command rejection; successful execution returns DO in high-Z, not data.
93LC56X/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC56X/SN FAQ
1.How can I place an order for 93LC56X/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56X/SN 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 93LC56X/SN reliable?
The price and inventory of 93LC56X/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56X/SN is usually 5 days.
3.What payment methods are accepted for 93LC56X/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56X/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56X/SN?
93LC56X/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56X/SN 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 93LC56X/SN?
For technical support, including 93LC56X/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56X/SN requirements.
6.How does Aetrix verify that 93LC56X/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56X/SN 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 93LC56X/SN meets industry standards.
7.What is the process for return or replacement of 93LC56X/SN?
All 93LC56X/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56X/SN, 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 93LC56X/SN part is unused and in its original packaging.
Return procedure for 93LC56X/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56X/SN Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
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