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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 93LC56B-I/P

Name: 93LC56B-I/P
Brand: Microchip Technology
SKU: 93LC56B-I/P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 93LC56B-I/P

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: 93LC56B-I/P.pdf

Description:: IC EEPROM 2KBIT MICROWIRE 8DIP

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Product details

Overview

93LC56B-I/P from Microchip Technology Inc. is a 2 Kbit (128 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status via DO pin, and 1 million erase/write endurance - used for parameter storage in embedded microcontroller systems.

For engineers reviewing the 93LC56B-I/P datasheet, 93LC56B-I/P pinout, 93LC56B-I/P application, or 93LC56B-I/P equivalent, key selection criteria include its fixed 16-bit organization (no ORG pin), PDIP-8 package compatibility, 3 MHz max clock frequency at 4.5–5.5 V, power-on data protection, and sequential read capability in microcontroller peripheral memory subsystems.

Technical Context

This device implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS), and internal auto-erase-before-write logic. Communication uses CS, CLK, DI, and DO pins with strict timing constraints including TCSL ≥250 ns and TPD ≤200 ns at 4.5–5.5 V.

It operates in Standby mode when CS is low, transitions to active on CS high + Start bit (CS=1, DI=1 at CLK rising edge), and asserts Ready/Busy on DO during programming - requiring external polling or delay-based synchronization. The ORG pin is NC, confirming fixed x16 organization per device family specification.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	2 Kbit (128 words × 16 bits) - supports compact configuration storage without external word-width translation logic
V_CC range	2.5 V to 5.5 V - interoperable with 3.3 V and 5 V microcontrollers without level shifting
Clock frequency	Up to 3 MHz at 4.5–5.5 V - enables fast parameter updates in real-time control loops
Endurance	1,000,000 erase/write cycles - suitable for firmware calibration tables updated daily over 27 years
Data retention	Greater than 200 years - ensures long-term reliability in unpowered storage applications
Write cycle time	6 ms typical (T_WC) - defines minimum inter-write interval for burst configuration writes
Interface	3-wire Microwire-compatible (CS, CLK, DI/DO) - reduces MCU GPIO count and PCB routing complexity

Pinout & Package

8-lead PDIP (Plastic Dual In-line Package) with 0.3-inch body width, through-hole mounting, RoHS-compliant matte tin finish. Pin 1 marked by notch or dot; pin 1 ID confirmed per DS21794G-page 17.

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
2 (CLK)	Serial Clock	Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data
3 (DI)	Data Input	Receives start bit, instruction opcodes, address bits, and write data; no internal pull-up
4 (DO)	Data Output / Status	Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status read
5 (V_SS)	Ground	Reference for all I/O and internal circuitry; requires low-impedance connection to system GND plane
6 (NC)	No Connect	Internally unconnected; must be left floating or tied to GND per design guidelines (no voltage applied)
7 (NC)	No Connect	Same as Pin 6; dual NC pins confirm absence of ORG function in 93LC56B variant
8 (V_CC)	Power Supply	Supplies core and I/O circuits; requires local 0.1 µF ceramic decoupling capacitor within 5 mm

Key Features

Feature	Design Value
Self-timed erase/write cycles	Eliminates need for external timing control or software delays - simplifies driver implementation
Automatic ERAL before WRAL	Guarantees full array readiness prior to bulk write, preventing partial-write corruption
Power-on/off data protection	Hardware-level V_CC monitor disables writes below 1.5 V - prevents inadvertent writes during brown-out
Ready/Busy status on DO	Enables efficient polling instead of fixed-delay waits - improves system responsiveness
Sequential read function	Allows continuous address incrementing with single CS assertion - reduces transaction overhead

Applications

Industrial Sensor Calibration	Consumer Appliance Settings
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot and runtime via MCU SPI-like bit-banged Microwire interface. Use Value: Enables field recalibration without firmware update; 200-year retention ensures lifetime accuracy without battery backup.	Use Scenario: Saving user preferences (temperature setpoints, timer durations, display brightness) across power cycles in microwave ovens. IC Role / Device Role / Timing Role: Low-pin-count configuration memory interfaced to 8-bit MCU with limited GPIO resources. Use Value: 128×16-bit organization matches common 16-bit MCU data paths, eliminating byte-splitting logic.
Medical Device Configuration	Automotive Body Control Module
Use Scenario: Holding regulatory-compliant operational limits (e.g., maximum infusion rate, alarm thresholds) in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with hardware write-protection (EWEN/EWDS) activated post-configuration. Use Value: 1M endurance supports frequent recalibration during service; industrial temp range covers clinical environments.	Use Scenario: Storing door lock/unlock patterns, mirror position memory, and lighting profiles in vehicle BCMs. IC Role / Device Role / Timing Role: Secondary nonvolatile memory supplementing main MCU flash for infrequently changed user data. Use Value: Microwire interface avoids dedicated SPI peripheral use; PDIP-8 allows easy prototyping and rework.

Industrial Sensor Calibration

Consumer Appliance Settings

Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in HVAC controllers.

IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot and runtime via MCU SPI-like bit-banged Microwire interface.

Use Value: Enables field recalibration without firmware update; 200-year retention ensures lifetime accuracy without battery backup.

Use Scenario: Saving user preferences (temperature setpoints, timer durations, display brightness) across power cycles in microwave ovens.

IC Role / Device Role / Timing Role: Low-pin-count configuration memory interfaced to 8-bit MCU with limited GPIO resources.

Use Value: 128×16-bit organization matches common 16-bit MCU data paths, eliminating byte-splitting logic.

Medical Device Configuration

Automotive Body Control Module

Use Scenario: Holding regulatory-compliant operational limits (e.g., maximum infusion rate, alarm thresholds) in portable infusion pumps.

IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with hardware write-protection (EWEN/EWDS) activated post-configuration.

Use Value: 1M endurance supports frequent recalibration during service; industrial temp range covers clinical environments.

Use Scenario: Storing door lock/unlock patterns, mirror position memory, and lighting profiles in vehicle BCMs.

IC Role / Device Role / Timing Role: Secondary nonvolatile memory supplementing main MCU flash for infrequently changed user data.

Use Value: Microwire interface avoids dedicated SPI peripheral use; PDIP-8 allows easy prototyping and rework.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
93LC56B-I/SN	SOIC-8 package (surface-mount), identical electrical specs and pinout mapping	Required for automated PCB assembly; lacks through-hole mounting for manual debug boards	Select for volume production where reflow compatibility and board space are critical
AT25020B-MAHL-T	2 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz clock, different command set and status reporting	Requires SPI peripheral instead of bit-banged Microwire; higher speed but incompatible protocol stack	Select only if migrating to SPI infrastructure and redesigning firmware communication layer

Compared with 93LC56B-I/P, the 93LC56B-I/SN offers identical functionality in SOIC-8 for SMT lines, while AT25020B-MAHL-T provides faster SPI access but demands full protocol replacement - making the PDIP variant optimal for legacy designs and prototyping.

Availability

93LC56B-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance settings, medical device configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for 93LC56B-I/P 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, with global design and manufacturing operations.

The 93LC56B-I/P belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems needing reliable, pin-efficient nonvolatile storage with minimal MCU resource usage.

FAQ

What is the memory organization of the 93LC56B-I/P?

The 93LC56B-I/P has a fixed 128 × 16-bit (2 Kbit) organization. Unlike 'C' variants, it lacks an ORG pin - confirming dedicated 16-bit operation per the Device Selection Table in DS21794G. This eliminates external configuration logic and simplifies interface timing for 16-bit data paths.

Does the 93LC56B-I/P require an external pull-up resistor on the DO pin?

No, the 93LC56B-I/P does not require an external pull-up on DO. The pin actively drives high/low during Read or Ready/Busy status reporting and enters High-Z when deselected (CS low) or after status polling. A pull-up may cause bus contention if DI and DO are shorted - refer to Section 2.2 for resistor guidance in shared-bus configurations.

What is the minimum V_CC required to prevent accidental writes on the 93LC56B-I/P?

The 93LC56B-I/P incorporates hardware power-on protection that inhibits all write operations below a typical V_CC of 1.5 V (DS21794G, Table 1-1, Note 1). This ensures data integrity during power ramp-up/down and brown-out conditions without requiring external reset supervisors.

Can the 93LC56B-I/P be used with a 3.3 V microcontroller?

Yes, the 93LC56B-I/P operates across 2.5 V to 5.5 V, making it fully compatible with 3.3 V systems. Its VIH1 threshold is 2.0 V (min) at V_CC ≥2.7 V, and VOL1 is ≤0.4 V at I_OL = 2.1 mA - ensuring robust logic-level interoperability with standard 3.3 V CMOS outputs and inputs.

Is the 93LC56B-I/P RoHS compliant and lead-free?

Yes, the 93LC56B-I/P is Pb-free and RoHS compliant, with a matte tin (Sn) finish on its PDIP leads per DS21794G-page 1. This satisfies EU Directive 2011/65/EU and supports environmentally responsible manufacturing and end-of-life handling.

93LC56B-I/P Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Programmable:: Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 2Kbit

Memory Organization:: 128 x 16

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 ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-PDIP

93LC56B-I/P FAQ

1.How can I place an order for 93LC56B-I/P through Aetrix?

Please submit a Request for Quotation (RFQ) for 93LC56B-I/P 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 93LC56B-I/P reliable?

The price and inventory of 93LC56B-I/P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC56B-I/P is usually 5 days.

3.What payment methods are accepted for 93LC56B-I/P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC56B-I/P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 93LC56B-I/P?

93LC56B-I/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 93LC56B-I/P 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 93LC56B-I/P?

For technical support, including 93LC56B-I/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC56B-I/P requirements.

6.How does Aetrix verify that 93LC56B-I/P is sourced from the original manufacturer or authorized distributors?

All 93LC56B-I/P 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 93LC56B-I/P meets industry standards.

7.What is the process for return or replacement of 93LC56B-I/P?

All 93LC56B-I/P units undergo pre-shipment inspection (PSI). If there is an issue with 93LC56B-I/P, 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 93LC56B-I/P part is unused and in its original packaging.

Return procedure for 93LC56B-I/P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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