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Microchip Technology 93LC56AT-E/ST
- Part No.:
- 93LC56AT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56AT-E/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,029
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Product details
Overview
93LC56AT-E/ST from Microchip Technology is a 2 Kbit (256 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and automotive-grade temperature operation (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status on DO pin, and 1,000,000 endurance cycles - used for configuration storage in engine control units and infotainment boot loaders.
For engineers reviewing the 93LC56AT-E/ST datasheet, 93LC56AT-E/ST pinout, 93LC56AT-E/ST application, or 93LC56AT-E/ST equivalent, key selection criteria include its automotive temperature rating, 8-bit fixed organization (no ORG pin), TSSOP-8 package, 3-wire serial protocol compatibility, and built-in power-on/off data protection circuitry.
Technical Context
The 93LC56AT-E/ST implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It uses a dedicated 8-bit memory organization (256 × 8), eliminating ORG pin dependency - unlike C-versions. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are executed via clocked bit sequences starting with a Start condition (CS high + DI high on CLK rising edge).
Internal logic includes an address decoder, data register, mode decode logic, and output buffer. Write operations trigger auto-erase before programming; ERAL and WRAL commands are fully self-timed (6 ms and 15 ms typical, respectively) and require VCC ≥ 4.5 V. Ready/Busy status is polled via DO pin after CS reassertion with ≥250 ns low time (TCSL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit) - fixed 8-bit organization; no ORG pin required or functional. |
| Supply voltage | 2.5 V to 5.5 V - supports wide-range industrial and automotive power rails; POR threshold at 1.5 V. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified for under-hood and safety-critical ECUs. |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration and firmware parameter updates. |
| Data retention | 200 years at +85°C - ensures nonvolatile storage integrity over full vehicle lifecycle. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage; no SPI mode or dual I/O. |
| Write cycle time | 6 ms typical (TWC) - deterministic timing for host software timeout handling during programming. |
Pinout & Package
93LC56AT-E/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad not present (unlike DFN/TDFN variants).
| 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 completes ongoing write. |
| 2 (CLK) | Serial Clock | Synchronizes all bit transfers on rising edge; stoppable at any point; ignored when CS is low. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and data; tied high with CS to initiate instruction sequence. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires CS high ≥250 ns to sample status. |
| 5 (VSS) | Ground | Reference return path for all I/O and internal logic; must be low-impedance connection. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice - no functionality. |
| 7 (NC) | No Connect | Second NC pin; identical treatment as Pin 6; no internal bond wire or circuit connection. |
| 8 (VCC) | Power Supply | Primary supply input; powers internal logic, memory array, and I/O buffers; decoupling capacitor mandatory. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control; host only waits for DO status or uses fixed 6 ms timeout. |
| Automatic ERAL before WRAL | Guarantees clean memory state prior to full-array write - prevents partial-data corruption without host intervention. |
| Power-on/off data protection | Hardware-level inhibition below 1.5 V VCC; prevents spurious writes during brown-out or power ramp-up/down. |
| Ready/Busy status on DO | Enables polling-based host synchronization instead of fixed delays - improves system responsiveness and efficiency. |
| Sequential read mode | Allows continuous address increment and data streaming while CS remains high - reduces command overhead for block reads. |
| EWEN/EWDS security lock | Prevents accidental writes: device powers up in EWDS state; explicit EWEN required before each erase/write session. |
Applications
| Engine Control Unit (ECU) | Automotive Infotainment Boot Loader |
|---|---|
Use Scenario: Storing trim values, sensor calibration coefficients, and fault code history across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during ECU initialization and runtime diagnostics. Use Value: Automotive temperature rating (−40°C to +125°C) and 200-year data retention ensure reliability over 15+ year vehicle service life. |
Use Scenario: Holding secure boot keys, firmware hash signatures, and display resolution settings before main SoC initialization. IC Role / Device Role / Timing Role: Early-boot configuration store accessed via MCU's Microwire peripheral before DRAM or flash initialization. Use Value: 3-wire interface minimizes pin count on boot controller; 6 ms write time enables fast parameter updates during factory programming. |
| Body Control Module (BCM) | Advanced Driver Assistance System (ADAS) Camera Module |
Use Scenario: Saving user preferences (window positions, mirror angles, lighting profiles) and door lock event logs. IC Role / Device Role / Timing Role: Persistent parameter storage interfaced to 8-bit microcontroller with limited GPIO resources. Use Value: TSSOP-8 package enables compact PCB layout; 1M endurance supports daily user adjustments over 10+ years. |
Use Scenario: Storing lens calibration data, ISP configuration registers, and thermal compensation tables for image sensors. IC Role / Device Role / Timing Role: Calibration data repository accessed during camera power-up and temperature drift compensation routines. Use Value: Built-in ERAL/WRAL simplifies field recalibration; 2.5 V min VCC allows direct connection to 3.3 V camera power rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56BT-E/ST | 128 × 16-bit organization; same VCC range, temp grade, and package - but outputs 16-bit words per READ. | Requires host firmware support for 16-bit word access; incompatible with 8-bit-only drivers or legacy code. | Select only if system architecture mandates 16-bit data alignment and memory bandwidth optimization. |
| AT25DF021-SSH-T | SPI interface (4-wire), 2 Mbit density, 2.7–3.6 V supply, industrial temp only (−40°C to +85°C). | Higher density and faster SPI clock (up to 70 MHz) but lacks automotive qualification and Microwire compatibility. | Use when migrating to SPI-based platforms or requiring >2 Kbit capacity - not a drop-in replacement. |
Compared with 93LC56BT-E/ST, the 93LC56AT-E/ST provides native 8-bit word access without bit-packing overhead; compared with AT25DF021-SSH-T, it offers guaranteed automotive qualification and simpler 3-wire timing but lower density and slower throughput.
Availability
93LC56AT-E/ST is available at Aetrix Electronics and suitable for automotive electronics, engine management systems, and infotainment modules requiring stable component supply across extended product lifecycles.
Supply support for 93LC56AT-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 93LC56A/B/C family was designed specifically for cost-sensitive, low-power, nonvolatile memory applications in automotive and industrial systems where Microwire compatibility, small footprint, and robust data retention are critical.
FAQ
What is the memory organization of the 93LC56AT-E/ST?
The 93LC56AT-E/ST has a fixed 256 × 8-bit organization - meaning it stores 256 bytes, accessible as 8-bit words. Unlike C-versions, it does not have an ORG pin and cannot be configured for 16-bit operation. This simplifies hardware design and eliminates external logic for word-size selection, making it ideal for 8-bit microcontroller interfaces.
Does the 93LC56AT-E/ST support SPI communication?
No, the 93LC56AT-E/ST does not support SPI. It implements a Microwire-compatible 3-wire serial interface (CS, CLK, DI/DO) with specific instruction opcodes and timing. While functionally similar to SPI in using clocked serial data, it lacks MOSI/MISO separation and requires strict adherence to Microwire start conditions and command formats - not SPI mode bits or CPOL/CPHA settings.
What is the purpose of the NC pins on the 93LC56AT-E/ST?
The 93LC56AT-E/ST has two NC (No Connect) pins - Pins 6 and 7 in the TSSOP-8 package. These pins have no internal connection to die circuitry and must be left floating or tied to VSS per board layout guidelines. They exist for mechanical symmetry and package compatibility across the 93XX56 family - for example, Pin 6 corresponds to ORG on C-versions, which is unused in A-versions like the 93LC56AT-E/ST.
How is data protection implemented during power transitions in the 93LC56AT-E/ST?
The 93LC56AT-E/ST includes hardware-level power-on/off data protection: internal circuitry inhibits all write operations when VCC falls below ~1.5 V. This prevents corruption during brown-out, power-up ramping, or sudden shutdown. Additionally, the device powers up in EWDS (Erase/Write Disable) state, requiring an explicit EWEN command before any programming - adding a software layer of protection against accidental writes.
Can the 93LC56AT-E/ST be used in place of the 93LC56A-I/ST?
Yes, the 93LC56AT-E/ST is a direct functional and pin-compatible upgrade to the 93LC56A-I/ST, differing only in temperature grade: 'E' supports −40°C to +125°C (automotive), while 'I' supports −40°C to +85°C (industrial). Electrical specifications, pinout, instruction set, and timing are identical. No PCB or firmware changes are required - only qualification for extended temperature operation.
93LC56AT-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:
- 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:
- 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
93LC56AT-E/ST FAQ
1.How can I place an order for 93LC56AT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56AT-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 93LC56AT-E/ST reliable?
The price and inventory of 93LC56AT-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 93LC56AT-E/ST is usually 5 days.
3.What payment methods are accepted for 93LC56AT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56AT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56AT-E/ST?
93LC56AT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56AT-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 93LC56AT-E/ST?
For technical support, including 93LC56AT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56AT-E/ST requirements.
6.How does Aetrix verify that 93LC56AT-E/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56AT-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 93LC56AT-E/ST meets industry standards.
7.What is the process for return or replacement of 93LC56AT-E/ST?
All 93LC56AT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56AT-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 93LC56AT-E/ST part is unused and in its original packaging.
Return procedure for 93LC56AT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56AT-E/ST Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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AT24C08C-STUM-T
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