My Inquiry
My Account
Microchip Technology 93LC56T/SN
- Part No.:
- 93LC56T/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC56T/SN.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93LC56T/SN from Microchip Technology Inc. is a 2K-bit (256 × 8 or 128 × 16) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, ORG-pin-selectable memory organization, and self-timed erase/write cycles. It operates down to 2.5V, draws only 3 μA standby current at 2.5V, and supports industrial temperature range (−40°C to +85°C). It is used in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.
For engineers reviewing the 93LC56T/SN datasheet, 93LC56T/SN pinout, 93LC56T/SN application, or 93LC56T/SN equivalent, key selection criteria include voltage compatibility (2.5–5.5 V), x8/x16 configurability via ORG pin, guaranteed 1 million erase/write cycles, >200-year data retention, and SOIC-8 narrow (SN) package footprint for space-constrained PCBs.
Technical Context
The 93LC56T/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO lines - no SPI mode or address byte auto-increment. Memory organization (256 × 8 vs. 128 × 16) is statically selected by the logic level on the ORG pin at power-up and remains fixed during operation.
It features hardware-based power-on/off data protection, automatic ERAL before WRAL, and device status signaling via DO pin (low = busy, high = ready) during erase/write. All programming operations require explicit EWEN/EWDS command sequencing and are self-timed - no external timing control needed beyond minimum CS low time (250 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 or 128 × 16 bits), selectable via ORG pin - enables flexible byte/word addressing without firmware rework. |
| Supply voltage | 2.5 V to 5.5 V - supports direct connection to 3.3 V or 5 V rails without level-shifting in mixed-voltage systems. |
| Standby current | 3 μA typical at 2.5 V - enables ultra-low-power operation in battery-backed or energy-harvesting applications. |
| Erase/write endurance | 1,000,000 cycles - ensures long-term reliability in frequently updated configuration registers or logging buffers. |
| Data retention | >200 years at 25°C - guarantees nonvolatile data integrity across product lifetime without refresh. |
| Interface protocol | Industry-standard 3-wire Microwire (CS/CLK/DI/DO) - compatible with legacy microcontrollers lacking SPI hardware but supporting bit-banged serial I/O. |
| Operating temperature | −40°C to +85°C (Industrial grade) - validated for use in automotive body electronics, industrial controls, and outdoor IoT nodes. |
Pinout & Package
8-pin narrow SOIC (SN) package per JEDEC MS-012, 150-mil width, surface-mount compatible. Pin 1 marked by notch or dot; pin numbering follows standard SOIC convention (counterclockwise from notch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state and prevent spurious commands. |
| 2 (CLK) | Serial Clock | Positive-edge-triggered clock; synchronizes all opcode, address, and data transfers; stoppable at any point without corruption. |
| 3 (DI) | Data Input | Accepts start bit, opcode, address, and write data; requires setup/hold times relative to CLK rising edge (100 ns each). |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when inactive; requires pull-up for reliable status polling. |
| 5 (VSS) | Ground | Reference return path for all digital and analog functions; must be low-impedance and decoupled near VCC pin. |
| 6 (ORG) | Organization Select | High = 128 × 16-bit mode; low = 256 × 8-bit mode; floating allowed only ≤1 MHz in x16 mode. |
| 7 (NU) | No Connect | Internally unconnected; must remain floating or tied to VSS/VCC per layout best practice - no functional role. |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; includes on-chip power-on reset and voltage monitor to inhibit programming below 1.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - WRAL completes in 16 ms typical, ERAL in 8 ms, WRITE/ERASE in 4 ms per word. |
| Power-on/off data protection | Hardware circuitry blocks all programming when VCC < 1.4 V - prevents corruption during brown-out or hot-plug events. |
| Sequential read function | Enables continuous burst reads across consecutive addresses while CS remains high - reduces command overhead in firmware. |
| EWEN/EWDS security lock | Explicit Erase/Write Enable/Disable commands prevent accidental writes - device powers up in EWDS state by default. |
| Device status signaling | DO pin provides real-time Ready/Busy feedback during programming - allows polling instead of fixed delay loops. |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Backup |
|---|---|
|
Use Scenario: Storing factory-calibrated coefficients for temperature, pressure, or humidity sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register holding trim values accessed at boot and updated during field recalibration. Use Value: Ensures measurement accuracy over product lifetime using >200-year data retention and 1M-cycle endurance for periodic updates. |
Use Scenario: Retaining user-defined settings (network IP, display brightness, alarm thresholds) across power cycles in medical diagnostic equipment. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to MCU via bit-banged Microwire, accessed during initialization and runtime save. Use Value: Enables zero-battery backup design with 3 μA standby current and 2.5 V operation compatible with Li-ion coin-cell backup rails. |
| Automotive Body Control Module | Consumer Appliance Power-Fail Logging |
|
Use Scenario: Recording door lock actuation history, mirror position presets, and seat memory in 12 V automotive body ECUs. IC Role / Device Role / Timing Role: Industrial-grade serial EEPROM with −40°C to +85°C rating, directly powered from regulated 5 V rail. Use Value: Survives automotive thermal cycling and meets AEC-Q200 stress requirements via proven Microchip process and qualification. |
Use Scenario: Capturing last operating state (timer value, cooking mode, error code) before AC mains loss in smart ovens and washing machines. IC Role / Device Role / Timing Role: Fast-write-capable EEPROM with auto-erase and WRAL support - stores full memory image within safe capacitor hold-up time. Use Value: WRAL completes in 16 ms typical at 5 V, enabling complete memory save before brown-out detection triggers shutdown. |
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 revision with enhanced ESD robustness (≥4 kV HBM), same 2K-bit capacity and SOIC-8 package. | Preferred for new designs requiring higher reliability in handling-sensitive environments or noisy industrial settings. | Select 93LC56C-I/SN if long-term supply continuity and improved robustness are prioritized over legacy 93LC56T/SN stock. |
| AT25020B-MAU-1.8 | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V supply, 5 MHz max clock, 200-year retention, SOIC-8. | Requires SPI-capable MCU; not Microwire-compatible - firmware driver rewrite needed; better suited for high-speed logging. | Choose AT25020B-MAU-1.8 only when migrating to SPI infrastructure and needing faster 5 MHz access versus 1 MHz Microwire limit. |
Compared with 93LC56C-I/SN, the 93LC56T/SN lacks updated ESD specs but maintains identical timing, pinout, and instruction set; compared with AT25020B-MAU-1.8, it offers Microwire compatibility and simpler GPIO-driven interface at the cost of lower speed and narrower voltage margin.
Availability
93LC56T/SN is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration backup, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for 93LC56T/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 leading provider of microcontrollers, analog components, and nonvolatile memory solutions, headquartered in Chandler, Arizona.
The 93LC56T/SN belongs to Microchip's legacy Microwire EEPROM family, designed specifically for low-power, pin-efficient configuration storage in resource-constrained embedded systems where SPI is unavailable or undesirable.
FAQ
What is the memory organization of the 93LC56T/SN and how is it selected?
The 93LC56T/SN supports two memory organizations: 256 × 8 bits or 128 × 16 bits. Selection is controlled by the ORG pin - tied to VCC for x16 mode, to VSS for x8 mode. This configuration is sampled at power-up and remains fixed during operation. The 93LC56T/SN does not support dynamic reconfiguration; the ORG pin must be externally biased with a stable voltage or pull-up/down resistor.
Does the 93LC56T/SN support SPI communication?
No, the 93LC56T/SN uses a proprietary Microwire-compatible 3-wire serial interface (CS, CLK, DI, DO), not SPI. It lacks an SS/CS slave select line independent of chip enable, and its instruction encoding, timing, and status reporting differ from SPI EEPROMs. Firmware drivers for SPI devices cannot be reused for the 93LC56T/SN without full protocol redesign.
What is the maximum clock frequency supported by the 93LC56T/SN?
The 93LC56T/SN supports up to 2 MHz clock frequency when VCC ≥ 4.5 V, and up to 1 MHz when VCC < 4.5 V. These limits are specified in the AC Characteristics table (DS21712C, page 3). Exceeding them may cause command misreads or timing violations, especially during status polling or sequential read operations.
How does the 93LC56T/SN handle power loss during a write cycle?
The 93LC56T/SN incorporates hardware power-loss protection: programming is automatically inhibited when VCC drops below ~1.4 V. If power fails mid-cycle, the internal state machine aborts the operation and retains pre-write data. No partial writes or corruption occurs. The 93LC56T/SN also requires explicit EWEN before any erase/write, adding software-level safeguarding.
Is the 93LC56T/SN RoHS compliant and lead-free?
Yes, the 93LC56T/SN in SN package is RoHS compliant and lead-free, with Matte Tin (Sn) plating per JEDEC standards. The Pb-free JEDEC designator "3e" appears on outer packaging, and the device meets J-STD-609 Category 1 requirements. Full compliance documentation is available in Microchip's Packaging Specification referenced in DS21712C.
93LC56T/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 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
93LC56T/SN FAQ
1.How can I place an order for 93LC56T/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56T/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 93LC56T/SN reliable?
The price and inventory of 93LC56T/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56T/SN is usually 5 days.
3.What payment methods are accepted for 93LC56T/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56T/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56T/SN?
93LC56T/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56T/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 93LC56T/SN?
For technical support, including 93LC56T/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56T/SN requirements.
6.How does Aetrix verify that 93LC56T/SN is sourced from the original manufacturer or authorized distributors?
All 93LC56T/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 93LC56T/SN meets industry standards.
7.What is the process for return or replacement of 93LC56T/SN?
All 93LC56T/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56T/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 93LC56T/SN part is unused and in its original packaging.
Return procedure for 93LC56T/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56T/SN Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
