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Texas Instruments SN74LVC244ADWG4
- Part No.:
- SN74LVC244ADWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC244ADWG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,438
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Product details
Overview
SN74LVC244ADWG4 from Texas Instruments is an octal 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It provides two independent 4-bit banks (1A/1Y and 2A/2Y), each controlled by its own output-enable pin (1OE, 2OE), with 5.9ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-used in server backplanes and telecom line-card signal routing.
For engineers reviewing the SN74LVC244ADWG4 datasheet, SN74LVC244ADWG4 pinout, SN74LVC244ADWG4 application, or SN74LVC244ADWG4 equivalent, key selection criteria include VCC operating range (1.65–3.6V), 3-state timing (ten/tdis ≤ 9.4ns), mixed-voltage translation capability (5.5V inputs to 3.3V VCC), thermal performance in DW package (RθJA = 114.8°C/W), and Ioff-enabled partial-power-down behavior.
Technical Context
The SN74LVC244ADWG4 implements two independent 4-bit noninverting buffers with CMOS 3-state outputs, where each bank's four outputs are simultaneously enabled or disabled via dedicated OE pins. Its balanced drive strength supports ±24mA output current at 3.0V VCC while maintaining low ground bounce (VOLP < 0.8V) and VOH undershoot (VOHV > 2V).
It features standard CMOS inputs with 5.5V tolerance, Ioff circuitry that disables all outputs when VCC = 0V, and a clamped diode structure limiting input/output voltage excursions. The device operates across –40°C to +125°C ambient, with guaranteed switching performance up to 3.6V supply and load capacitance up to 50pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables direct integration into 1.8V/2.5V/3.3V logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5V - Allows safe interfacing with legacy 5V peripherals or mixed-signal subsystems. |
| Max Propagation Delay | 5.9ns at 3.3V - Supports high-speed data transfer on PCB traces up to 12cm without signal integrity degradation. |
| Output Drive Strength | ±24mA at 3.0V - Sufficient to drive multiple CMOS loads or moderate capacitive traces without external buffering. |
| Ioff Current | ±20µA at VCC = 0V - Ensures zero-current leakage during hot-swap or partial power-down, preventing back-drive damage. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and telecom infrastructure environments with no derating required. |
| ESD Rating (HBM) | ±2000V - Meets JEDEC JS-001 for robust handling in automated assembly and field service. |
Pinout & Package
The SN74LVC244ADWG4 uses a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.80mm × 7.50mm), with gull-wing leads and standard 1.27mm pitch. Thermal resistance is RθJA = 114.8°C/W and RθJC(top) = 84.1°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 11, 13, 15 | Input (1A1–1A4, 2A1–2A4) | Noninverting data inputs for two independent 4-bit banks; accept 0–5.5V signals regardless of VCC. |
| 3, 19 | Output Enable (1OE, 2OE) | Active-low controls for respective banks; tie high via pull-up during power-up to ensure high-Z default state. |
| 12, 14, 16, 18, 9, 7, 5, 3 | Output (1Y1–1Y4, 2Y1–2Y4) | CMOS 3-state outputs with balanced sourcing/sinking; enter high-impedance when OE = high. |
| 10 | GND | Reference ground for all logic and power paths; must be low-impedance connection to minimize noise coupling. |
| 20 | VCC | Primary power supply (1.65–3.6V); requires local 0.1µF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | Enables 5V input signals to interface directly with 3.3V system buses-eliminates need for discrete level translators. |
| Ioff partial-power-down protection | Prevents current flow between powered and unpowered sections during hot-plug events, protecting downstream logic. |
| Balanced CMOS 3-state outputs | Provides matched rise/fall times and symmetrical drive strength (±24mA), reducing signal skew in parallel bus applications. |
| Low ground bounce (VOLP) | Typical < 0.8V at 3.3V ensures stable reference for adjacent sensitive analog or clock circuits on shared PCB layers. |
| Ultra-fast enable/disable timing | tdis ≤ 8.0ns and ten ≤ 9.4ns at 3.3V enables precise bus arbitration in time-critical multiplexed architectures. |
Applications
| Server Backplane Interface | LED Display Column Driver |
|---|---|
|
Use Scenario: Isolating control signals between CPU module and hot-swappable I/O mezzanine cards in 1U rack servers. IC Role / Device Role / Timing Role: Octal buffer providing direction-controlled, 3-state isolation between 3.3V processor GPIO and 5V-compatible peripheral address/data lines. Use Value: Ioff prevents back-drive during card insertion/removal; 5.5V-tolerant inputs eliminate external level-shifting components. |
Use Scenario: Driving 8-column segments of a 16×16 LED matrix in industrial HMI panels. IC Role / Device Role / Timing Role: High-current buffer translating microcontroller GPIO outputs to sink-driven LED columns with fast edge rates. Use Value: ±24mA per output sustains brightness across full matrix refresh; 5.9ns tpd minimizes column ghosting artifacts. |
| Telecom Line Card Signal Routing | Industrial I/O Expander Interface |
|
Use Scenario: Buffering serial control signals (SPI, UART) between baseband processor and RF transceiver modules in cellular base stations. IC Role / Device Role / Timing Role: Dual-bank 3-state driver enabling bidirectional signal isolation and bus contention avoidance on shared control lines. Use Value: Independent OE pins allow dynamic reconfiguration of signal paths; –40°C to +125°C rating ensures reliability in outdoor enclosures. |
Use Scenario: Extending GPIO count of PLC main controller to manage 16 digital sensors via two cascaded SN74LVC244ADWG4 devices. IC Role / Device Role / Timing Role: Parallel-output expander stage converting serial command data into synchronized 8-bit parallel enable/control signals. Use Value: Low ICC (≤40µA) reduces standby power; 3.3V compatibility aligns with modern ARM-based controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVCH244A | Includes bus-hold circuitry on all inputs; slightly higher ICC (max 10µA vs 40µA) but same VCC range and drive strength. | Preferred in systems with floating inputs or noisy environments where input state retention is critical. | Choose SN74LVCH244A if bus-hold functionality is required; otherwise SN74LVC244ADWG4 offers lower cost and identical core timing/performance. |
| 74LVC244APW | TSSOP-20 package (6.5mm × 6.4mm); RθJA = 120.3°C/W; identical electrical specs but smaller footprint and higher thermal resistance. | Better suited for space-constrained designs where board area is prioritized over thermal margin. | Select 74LVC244APW only when PCB real estate is constrained and thermal derating can be accommodated; SN74LVC244ADWG4 remains optimal for thermally demanding applications. |
Compared with SN74LVCH244A and 74LVC244APW, the SN74LVC244ADWG4 delivers superior thermal performance in SOIC packaging, eliminates bus-hold overhead where unnecessary, and maintains full pin compatibility with legacy LVC244 layouts-making it the preferred choice for industrial and telecom systems requiring long-term reliability and ease of layout reuse.
Availability
SN74LVC244ADWG4 is available at Aetrix Electronics and suitable for server backplanes, LED display drivers, telecom line cards, industrial I/O expanders, and embedded bus isolation applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for SN74LVC244ADWG4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface and power management ICs.
The SN74LVC244ADWG4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for robust 1.65–3.6V operation in industrial, telecom, and computing infrastructure where signal integrity, mixed-voltage interoperability, and thermal resilience are critical.
FAQ
What is the maximum input voltage the SN74LVC244ADWG4 can tolerate?
The SN74LVC244ADWG4 accepts input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic or legacy peripherals without external level shifters. This overvoltage tolerance is specified across the full operating temperature range (–40°C to +125°C) and applies to all eight input pins (1A1–1A4, 2A1–2A4). The internal clamp diodes limit current to ±50mA under fault conditions, ensuring robustness in mixed-voltage systems.
Does the SN74LVC244ADWG4 support hot-swap or live-insertion applications?
Yes, the SN74LVC244ADWG4 supports live insertion through its Ioff feature: when VCC = 0V, all outputs enter a high-impedance state with leakage current limited to ±20µA, preventing back-drive into powered circuitry. This allows safe insertion/removal in partially powered systems like modular telecom line cards or server I/O mezzanines-provided OE pins are pulled high via external resistors during power transitions.
What is the recommended bypass capacitor for the SN74LVC244ADWG4?
A 0.1µF ceramic capacitor is recommended for bypassing the VCC pin of the SN74LVC244ADWG4, placed as close as possible to the pin with minimal trace length and low-inductance ground return. For enhanced noise suppression, this can be paralleled with a 1µF capacitor. The SOIC (DW) package's thermal pad is not electrically connected, so no additional grounding is required beyond standard GND pin connections.
How does the SN74LVC244ADWG4 handle bus contention?
The SN74LVC244ADWG4 does not include built-in bus contention detection or protection. Its balanced CMOS outputs can source or sink up to ±24mA, but simultaneous driving of opposing logic states on the same net may exceed absolute maximum ratings (±50mA per output). System-level design must prevent contention using strict OE control sequencing, bus arbitration logic, or external current-limiting resistors-especially in multi-driver configurations.
Can the SN74LVC244ADWG4 be used as a level translator between 5V and 3.3V systems?
Yes, the SN74LVC244ADWG4 functions as a unidirectional down-translator: 5.5V-tolerant inputs accept 5V signals while operating from a 3.3V (or 1.8V/2.5V) VCC supply, producing valid 3.3V-compatible outputs. It does not translate in the reverse direction (3.3V out → 5V in), and output voltage swing is bounded by VCC-not 5V-so external pull-ups are required for true 5V logic levels on driven nets.
SN74LVC244ADWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVC244ADWG4 FAQ
1.How can I place an order for SN74LVC244ADWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244ADWG4 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 SN74LVC244ADWG4 reliable?
The price and inventory of SN74LVC244ADWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244ADWG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC244ADWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244ADWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC244ADWG4?
SN74LVC244ADWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244ADWG4 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 SN74LVC244ADWG4?
For technical support, including SN74LVC244ADWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244ADWG4 requirements.
6.How does Aetrix verify that SN74LVC244ADWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC244ADWG4 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 SN74LVC244ADWG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC244ADWG4?
All SN74LVC244ADWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244ADWG4, 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 SN74LVC244ADWG4 part is unused and in its original packaging.
Return procedure for SN74LVC244ADWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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