My Inquiry
My Account
Microchip Technology 93LC56A/ST
- Part No.:
- 93LC56A/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC56A/ST.pdf
- Description:
- IC EEPROM 2KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,507
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
93LC56A/ST from Microchip Technology Inc. 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 industrial/automotive temperature support (−40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, and Ready/Busy status signaling via DO pin - used for firmware parameter storage in embedded microcontroller systems.
For engineers reviewing the 93LC56A/ST datasheet, 93LC56A/ST pinout, 93LC56A/ST application, or 93LC56A/ST equivalent, key selection criteria include its fixed 8-bit organization (no ORG pin), 6 ms typical write cycle time, 1 million endurance cycles, and compatibility with SOIC-8 (ST) packaging for board-level nonvolatile configuration memory.
Technical Context
The 93LC56A/ST implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO signals. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit (CS high + DI high on CLK rising edge), followed by opcode, address, and data bits clocked on CLK rising edges.
It uses internal auto-erase-before-write logic and supports sequential read mode when CS remains high. The DO pin serves dual function: data output during READ and Ready/Busy status indicator during programming - low = busy, high = ready - requiring CS reassertion after TCSL ≥250 ns to sample status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 words × 8 bits) - fixed x8 organization; no ORG pin required |
| VCC range | 2.5 V to 5.5 V - supports wide-input industrial and automotive power rails |
| Write cycle time | 6 ms typical - self-timed; includes auto-erase; enables deterministic firmware update timing |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in field-updatable systems |
| Data retention | >200 years at 25°C - guarantees parameter integrity across product lifecycle |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage on host MCU |
| Temp range | −40°C to +125°C (E grade) - qualified for under-hood and industrial control environments |
Pinout & Package
93LC56A/ST is packaged in 8-lead SOIC (ST), with lead finish Pb-free (Matte Tin). Pin 1 is CS; pin 2 is CLK; pin 3 is DI; pin 4 is DO; pin 5 is VSS; pin 6 is NC (no internal connection, not ORG); pin 7 is NC; pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; deselects device into standby |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| DI (Pin 3) | Data Input | Receives Start bit, instruction opcodes, addresses, and write data; shares bus with DO only with external current-limiting resistor |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| VSS (Pin 5) | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
| NC (Pin 6) | No Connection | Not bonded; must remain unconnected - differs from ORG pin on 'C' variants |
| NC (Pin 7) | No Connection | Not bonded; floating or grounded per layout best practice; no functional role |
| VCC (Pin 8) | Power Supply | 2.5–5.5 V input; internal POR triggers at ~1.5 V; powers EEPROM array and logic |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control; 6 ms typical cycle enables predictable firmware update latency |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial writes due to residual data |
| Power-on/off data protection | Internal voltage monitor disables writes below ~1.5 V; prevents corruption during brown-out or hot-swap |
| Ready/Busy status on DO | Enables polling-based host synchronization without dedicated interrupt lines or timeouts |
| 1,000,000 endurance cycles | Supports frequent calibration or logging use cases over 10+ years of operation |
Applications
| Industrial Sensor Calibration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing factory-calibrated sensor offsets and gain coefficients in industrial pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding critical calibration constants accessed at boot and during field recalibration. Use Value: Ensures measurement accuracy across temperature and lifetime; leverages 200-year data retention and −40°C to +125°C operation. | Use Scenario: Retaining user-configured lighting preferences and door lock settings in automotive BCMs. IC Role / Device Role / Timing Role: Parameter EEPROM interfaced to 8-bit MCU via Microwire; updated during vehicle personalization events. Use Value: Supports E-grade qualification and withstands engine bay thermal cycling; 1M endurance handles repeated user updates. |
| Medical Infusion Pump Settings | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing drug library profiles, alarm thresholds, and dose history in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Low-power serial EEPROM enabling safe, infrequent writes during maintenance mode. Use Value: 2.5 V minimum VCC allows direct connection to Li-ion battery rail; 1 µA standby current extends battery life. | Use Scenario: Holding tariff tables, metering calibration factors, and communication keys in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure configuration store accessed by metrology SoC; write-protected via EWEN/EWDS sequence. Use Value: Built-in Erase/Write Disable (EWDS) prevents accidental overwrites during firmware upgrades or power faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC56B/ST | 128 × 16-bit organization; same VCC range, package, and timing | Requires 16-bit host interface; incompatible with 8-bit software drivers | Select only if system architecture mandates 16-bit word access and host supports x16 addressing |
| AT25020B-SSHL-T | SPI interface (4-wire), 2 Kbit, 1.8–5.5 V, 5 ms write time, same endurance | Requires SPI-capable MCU; different command set and CS/CLK timing behavior | Choose when migrating to SPI ecosystem or needing faster clock rates (up to 20 MHz) |
Compared with 93LC56B/ST, the 93LC56A/ST provides native 8-bit compatibility without address translation; versus AT25020B-SSHL-T, it retains Microwire simplicity and lower pin count but lacks SPI speed and daisy-chain capability.
Availability
93LC56A/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and medical infusion pump designs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC56A/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 components, and memory solutions, headquartered in Chandler, Arizona.
The 93LC56A/ST belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC56A/ST?
The 93LC56A/ST has a fixed 256 × 8-bit (2 Kbit) organization. Unlike 'C' variants, it does not feature an ORG pin - its x8 structure is hardwired, eliminating external configuration logic and simplifying PCB layout and firmware driver design for 8-bit hosts.
Does the 93LC56A/ST require an external pull-up resistor on the DO pin?
No, the 93LC56A/ST does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when CS is low or during non-read operations - consistent with Microwire protocol requirements.
How is write protection implemented on the 93LC56A/ST?
Write protection on the 93LC56A/ST is enforced via the EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) instructions. The device powers up in EWDS mode; an explicit EWEN command must precede any ERASE or WRITE operation, and EWDS should follow to relock the array - preventing accidental overwrites.
What is the maximum clock frequency supported by the 93LC56A/ST at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC56A/ST supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) for 2.5 V ≤ VCC < 5.5 V, ensuring reliable setup/hold timing margins for robust communication with diverse MCUs.
Is the 93LC56A/ST pin-compatible with the 93AA56A/ST?
Yes, the 93LC56A/ST and 93AA56A/ST share identical 8-lead SOIC (ST) packaging, pinout, and x8 organization. However, they differ in VCC range (93AA56A: 1.8–5.5 V; 93LC56A: 2.5–5.5 V) and temperature grading - verify voltage compliance before substitution.
93LC56A/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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC56A/ST FAQ
1.How can I place an order for 93LC56A/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC56A/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 93LC56A/ST reliable?
The price and inventory of 93LC56A/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56A/ST is usually 5 days.
3.What payment methods are accepted for 93LC56A/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56A/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC56A/ST?
93LC56A/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC56A/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 93LC56A/ST?
For technical support, including 93LC56A/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56A/ST requirements.
6.How does Aetrix verify that 93LC56A/ST is sourced from the original manufacturer or authorized distributors?
All 93LC56A/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 93LC56A/ST meets industry standards.
7.What is the process for return or replacement of 93LC56A/ST?
All 93LC56A/ST units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56A/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 93LC56A/ST part is unused and in its original packaging.
Return procedure for 93LC56A/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC56A/ST 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…
