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Microchip Technology 24LC22A-I/SN
- Part No.:
- 24LC22A-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC22A-I/SN.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:605
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Product details
Overview
24LC22A-I/SN from Microchip Technology Inc. is a 2 Kbit dual-mode serial EEPROM designed for VESA DDC/EDID applications in display systems. It operates in Transmit-Only mode (1 Kbit, VCLK-clocked) and Bidirectional I²C mode (2 Kbit, SCL-clocked), supports 2.5–5.5V supply, features 1 mA active current, and is housed in an 8-pin SOIC package rated for -40°C to +85°C.
For engineers reviewing the 24LC22A-I/SN datasheet, 24LC22A-I/SN pinout, 24LC22A-I/SN application, or 24LC22A-I/SN equivalent, key selection considerations include its dual-clock interface (VCLK + SCL), E-EDID™ 1.3 compliance, page-write buffer (8 bytes), 1M endurance cycles, and write-protection via VCLK logic level - all critical for monitor identification and configuration storage in embedded display interfaces.
Technical Context
The 24LC22A-I/SN implements two independent serial protocols on shared SDA: a unidirectional DDC1™ mode synchronized to VCLK (for continuous EDID transmission), and a bidirectional I²C-compatible mode synchronized to SCL (for full 2 Kbit read/write access). Mode transition is triggered by a high-to-low edge on SCL while VCLK remains idle.
Its internal architecture includes a dual-port memory array with separate address pointers, Schmitt-triggered inputs on SDA/SCL/VCLK for noise immunity, and a VCC threshold detector that disables writes below 1.5V. Write enable requires VCLK = high in Bidirectional mode; holding VCLK = low provides hardware write protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 × 8-bit (2 Kbit) with dual-mode addressing: first 1 Kbit accessible in Transmit-Only mode, full 2 Kbit in Bidirectional mode |
| Interface modes | Transmit-Only (VCLK clocked, unidirectional EDID stream) and Bidirectional I²C (SCL clocked, full read/write) |
| Supply voltage | 2.5V to 5.5V - enables direct integration into 3.3V and 5V display subsystems without level shifting |
| Write endurance | 1,000,000 erase/write cycles - ensures long-term reliability in dynamic EDID update scenarios |
| Data retention | Greater than 200 years at 25°C - guarantees persistent display configuration storage over product lifetime |
| I²C speed | 100 kHz at 2.5V, 400 kHz at 5V - matches standard DDC2B timing requirements and supports faster host polling |
| ESD protection | >4000V HBM - robust against electrostatic discharge during board handling and system integration |
Pinout & Package
24LC22A-I/SN is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 3.90 mm body width, RoHS-compliant matte tin plating, and industrial temperature range (-40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground reference | System return path; must be connected to PCB ground plane for stable operation and noise immunity |
| SDA | Serial data I/O | Open-drain bidirectional bus line shared between both modes; requires external pull-up resistor (2–10 kΩ) |
| SCL | Bidirectional mode clock input | Triggers mode transition from Transmit-Only to Bidirectional; controls I²C timing and bus arbitration |
| VCLK | Transmit-Only mode clock input / write-enable control | Clocks EDID bitstream in Transmit-Only mode; must be held high to permit writes in Bidirectional mode |
| VCC | Power supply | 2.5–5.5V supply input; internal regulation enables consistent performance across voltage range |
| NC (pins 1, 2, 3) | No internal connection | Unbonded pins; must remain unconnected per Microchip design - no routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation | Enables seamless EDID broadcast (Transmit-Only) and host-configurable memory updates (Bidirectional) on same device |
| E-EDID™ 1.3 compliance | Fully implements VESA DDC1™/DDC2™ standards for plug-and-play monitor identification and capability reporting |
| Hardware write protection | VCLK pin doubles as write-enable: logic low disables all writes, enabling ROM-like behavior without software locks |
| Page-write buffer (8 bytes) | Reduces I²C bus occupancy by up to 8× vs. byte-write - critical for minimizing DDC bus contention in multi-monitor systems |
| Noise-immune inputs | Schmitt-triggered SDA/SCL/VCLK with 50 ns spike suppression ensures reliable operation on electrically noisy display PCBs |
Applications
| Monitor EDID Storage | Display Configuration Memory |
|---|---|
|
Use Scenario: Storing Extended Display Identification Data (E-EDID™) in LCD/LED monitors for automatic resolution, timing, and color profile negotiation with GPUs. IC Role / Device Role / Timing Role: Primary EDID source in DDC1™/DDC2™ channel; transmits fixed 128-byte block continuously on VCLK in Transmit-Only mode. Use Value: Eliminates need for external microcontroller or FPGA to manage EDID - reduces BOM cost and firmware complexity. |
Use Scenario: Storing user-adjusted display settings (brightness, contrast, gamma, input source mapping) that persist across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C in Bidirectional mode; supports random read/write of individual bytes. Use Value: Enables field-upgradable display parameters without requiring reprogramming tools - improves serviceability and customization. |
| Video Wall Controller | Embedded Graphics Subsystem |
|
Use Scenario: Managing unique EDID profiles for each tile in large-format video walls where individual panel calibration and identity must be preserved. IC Role / Device Role / Timing Role: Dedicated 24LC22A-I/SN per panel provides isolated, tamper-resistant EDID storage; VCLK synchronized to panel-specific sync signal. Use Value: Prevents EDID corruption during hot-swap events and allows per-panel firmware updates without disrupting wall-wide timing. |
Use Scenario: Storing GPU initialization tables, display port training sequences, and HDCP keys in embedded systems like medical imaging or digital signage controllers. IC Role / Device Role / Timing Role: Secure boot-time configuration store accessed early in power-on sequence; write-protected via VCLK = low after programming. Use Value: Ensures deterministic display initialization and prevents accidental overwrite of critical security or timing parameters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC21A-I/SN | 1 Kbit capacity, single-mode only (Transmit-Only), no Bidirectional I²C support | Limited to basic DDC1™ EDID broadcast; cannot store extended configuration or support host updates | Select only when full 2 Kbit and bidirectional access are unnecessary - lower cost but reduced flexibility |
| AT24C256-10PU-2.7 | 256 Kbit I²C EEPROM, single-mode only, no VCLK pin or Transmit-Only functionality | Requires external controller for EDID streaming; lacks native DDC1™ compatibility and hardware write protection | Choose for high-capacity general-purpose storage where DDC protocol offload is handled in firmware |
Compared with 24LC22A-I/SN, the 24LC21A-I/SN sacrifices bidirectional configurability for lower cost and simpler layout, while the AT24C256-10PU-2.7 offers vastly more memory but requires full software implementation of EDID timing and lacks VCLK-based hardware write protection - making 24LC22A-I/SN uniquely suited for integrated DDC/EDID solutions.
Availability
24LC22A-I/SN is available at Aetrix Electronics and suitable for display interface design, monitor manufacturing, and embedded graphics subsystems requiring stable component supply, guaranteed industrial temperature operation, and long-term lifecycle support.
Supply support for 24LC22A-I/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24LC22A-I/SN belongs to Microchip's legacy serial EEPROM family optimized for display industry standards - specifically engineered to offload VESA DDC/EDID protocol handling from host processors while ensuring robustness in electrically noisy video environments.
FAQ
What is the primary function of the VCLK pin on the 24LC22A-I/SN?
The VCLK pin serves two distinct functions: in Transmit-Only mode, it clocks out EDID data bits on the rising edge for DDC1™ compliance; in Bidirectional mode, it acts as a hardware write-enable - writes are permitted only when VCLK is held high, and setting it low disables all write operations. This dual role eliminates the need for external write-protect circuitry in the 24LC22A-I/SN design.
How does the 24LC22A-I/SN switch between Transmit-Only and Bidirectional modes?
The 24LC22A-I/SN powers up in Transmit-Only mode. A valid high-to-low transition on the SCL pin triggers entry into Transition mode, where the device listens for its I²C slave address (1010000X). If detected within 128 VCLK pulses, it enters Bidirectional mode permanently until power is cycled. If no address is received, it reverts to Transmit-Only mode - a behavior explicitly defined in the 24LC22A-I/SN functional specification.
Does the 24LC22A-I/SN support standard I²C addressing and ACK polling?
Yes, the 24LC22A-I/SN uses standard 7-bit I²C addressing (1010000) with R/W bit, and fully supports ACK polling to detect write completion. After issuing a Stop condition, the master can immediately send a Start + control byte (R/W=0); absence of ACK indicates ongoing internal write cycle, while ACK confirms readiness - a documented feature used to maximize bus throughput in the 24LC22A-I/SN datasheet.
What is the maximum page-write size supported by the 24LC22A-I/SN?
The 24LC22A-I/SN supports an 8-byte page-write buffer. During a page write, the master sends up to eight data bytes before the final Stop condition; the device stores them in an on-chip latch and writes them sequentially to memory. Exceeding eight bytes causes wraparound within the same page - a constraint explicitly detailed in Section 4.2 of the 24LC22A-I/SN datasheet to prevent unintended cross-page writes.
Is the 24LC22A-I/SN compatible with both 3.3V and 5V display systems?
Yes, the 24LC22A-I/SN operates across 2.5V to 5.5V, making it compatible with both 3.3V and 5V display subsystems. Its I²C interface meets 100 kHz timing at 2.5V and 400 kHz at 5V, and its Schmitt-triggered inputs ensure reliable signal recognition across voltage levels - a key specification confirmed in the DC and AC characteristics tables of the 24LC22A-I/SN datasheet.
24LC22A-I/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
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24LC22A-I/SN FAQ
1.How can I place an order for 24LC22A-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC22A-I/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 24LC22A-I/SN reliable?
The price and inventory of 24LC22A-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC22A-I/SN is usually 5 days.
3.What payment methods are accepted for 24LC22A-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC22A-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC22A-I/SN?
24LC22A-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC22A-I/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 24LC22A-I/SN?
For technical support, including 24LC22A-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC22A-I/SN requirements.
6.How does Aetrix verify that 24LC22A-I/SN is sourced from the original manufacturer or authorized distributors?
All 24LC22A-I/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 24LC22A-I/SN meets industry standards.
7.What is the process for return or replacement of 24LC22A-I/SN?
All 24LC22A-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC22A-I/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 24LC22A-I/SN part is unused and in its original packaging.
Return procedure for 24LC22A-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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