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Texas Instruments SN74LVC244ADBRG4
- Part No.:
- SN74LVC244ADBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC244ADBRG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,992
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Product details
Overview
SN74LVC244ADBRG4 from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for asynchronous bus interfacing in 1.65V–3.6V systems. It features dual 4-bit banks, 5.9ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and Ioff support for live insertion-used in server backplanes and telecom infrastructure signal routing.
For engineers reviewing the SN74LVC244ADBRG4 datasheet, SN74LVC244ADBRG4 pinout, SN74LVC244ADBRG4 application, or SN74LVC244ADBRG4 equivalent, this page delivers verified electrical specs, package mapping to SSOP-20 (DB), functional mode behavior, real-world translation use cases, and two validated alternative parts with documented differences.
Technical Context
The SN74LVC244ADBRG4 implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable input (1OE, 2OE). Each bank drives its four outputs (e.g., 1Y1–1Y4) directly from corresponding inputs (1A1–1A4), with CMOS-compatible logic thresholds and balanced drive strength (±24mA at 3V).
Its Ioff circuitry disables all outputs when VCC = 0V, preventing back-drive current and enabling partial-power-down operation. Input tolerance up to 5.5V allows mixed-voltage interfacing-e.g., 5V peripherals driving into a 3.3V system bus-without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - supports modern low-voltage logic domains while maintaining compatibility with legacy 3.3V infrastructure |
| Input Voltage Tolerance | Up to 5.5V - enables direct connection of 5V signals without clamping diodes or external protection |
| Max Propagation Delay | 5.9ns at 3.3V - ensures timing-critical bus buffering in high-speed digital interfaces (e.g., memory expansion, FPGA I/O) |
| Output Drive Strength | ±24mA at 3V - sufficient to drive 50Ω transmission lines or multiple CMOS loads over PCB traces up to 12cm |
| Operating Temperature | –40°C to +125°C - qualified for industrial and telecom environments where thermal stability is critical |
| Ioff Current | ±20µA at 5.5V - guarantees safe hot-plug operation and prevents power rail contention during partial power-down |
| ESD Rating (HBM) | ±2000V - meets JEDEC JS-001 for robust handling in manufacturing and field service |
Pinout & Package
SN74LVC244ADBRG4 is packaged in a 20-pin SSOP (DB) with 0.65mm pitch, body size 7.2mm × 5.30mm, and nominal footprint 7.2mm × 7.8mm. The package includes exposed thermal pad on bottom for enhanced heat dissipation in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Input | Eight buffered data inputs, grouped into two 4-bit banks; tolerate 5.5V regardless of VCC |
| 1Y1–1Y4, 2Y1–2Y4 | Output | Eight 3-state outputs; enter high-impedance when respective OE is high, enabling bus sharing |
| 1OE, 2OE | Input | Active-low enable controls for Bank 1 and Bank 2; both must be low for output assertion |
| VCC | Power | Primary supply (1.65V–3.6V); powers internal logic and output drivers |
| GND | Ground | Reference return path for all signals and power; required for stable noise margin and ESD performance |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5V inputs safely interface with 3.3V VCC - eliminates need for discrete level translators in heterogeneous voltage systems |
| Ioff partial-power-down | Outputs disable completely at VCC = 0V - prevents back-driving and enables hot-swap capability in modular chassis designs |
| Balanced CMOS 3-state outputs | Sinks and sources up to ±24mA symmetrically - supports bidirectional bus termination and clean signal edges into light loads |
| Low ground bounce (VOLP) | <0.8V typical at 3.3V - reduces switching noise coupling into shared ground planes in dense PCB layouts |
| Ultra-small logic footprint | SSOP-20 occupies only 56.2 mm² - ideal for space-constrained applications like network switch line cards and LED display controllers |
Applications
| Server Backplane Interfacing | LED Display Column Drivers |
|---|---|
|
Use Scenario: Buffering address/data signals between CPU module and peripheral slots in modular server chassis. IC Role / Device Role / Timing Role: Octal buffer isolates source and load domains while maintaining signal integrity across long backplane traces. Use Value: 5.9ns tpd and ±24mA drive ensure setup/hold timing margins are met even with 12cm trace lengths and 50pF loads. |
Use Scenario: Driving column segments of high-brightness LED matrix displays requiring multiplexed current sourcing. IC Role / Device Role / Timing Role: 3-state outputs enable time-multiplexed column activation while minimizing ghosting via fast enable/disable transitions. Use Value: 7.6ns tdis at 3.3V ensures rapid output disable, reducing crosstalk between adjacent columns during scanning. |
| Telecom Line Card Signal Routing | FPGA I/O Expansion Interface |
|
Use Scenario: Translating control signals between 5V legacy PHYs and 3.3V FPGA-based packet processors on telecom line cards. IC Role / Device Role / Timing Role: Acts as a down-translator: accepts 5.5V inputs, outputs referenced to 3.3V VCC without external components. Use Value: 5.5V-tolerant inputs eliminate level-shifter ICs, reducing BOM count and board area in cost-sensitive carrier-grade hardware. |
Use Scenario: Expanding GPIO count of resource-constrained FPGAs to manage status LEDs, fan control, and sensor readouts. IC Role / Device Role / Timing Role: Provides eight additional push-pull outputs with configurable 3-state control per bank for flexible peripheral management. Use Value: Dual OE pins allow independent gating of two function groups (e.g., LEDs vs. fans), simplifying firmware state management. |
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; otherwise identical VCC range, drive strength, and pinout | Eliminates need for external pull-up/down resistors on unused or floating inputs - preferred in systems with intermittent signal sources | Select SN74LVCH244A when input signal integrity is compromised by slow edges or open-circuit conditions |
| 74LVC244APW,118 | NXP variant in TSSOP-20 package; same electrical specs but different thermal metrics (RθJA = 120.3°C/W vs. DB's 121.7°C/W) | Compatible footprint but slightly better thermal resistance; requires validation of solder paste profile due to differing land pattern tolerances | Choose 74LVC244APW,118 only if sourcing diversification is required and thermal margin analysis confirms suitability |
Compared with SN74LVC244ADBRG4, SN74LVCH244A adds bus-hold for robustness against floating inputs, while 74LVC244APW,118 offers second-source availability in a thermally similar TSSOP package-neither is pin-compatible without layout review due to mechanical differences between SSOP and TSSOP footprints.
Availability
SN74LVC244ADBRG4 is available at Aetrix Electronics and suitable for server backplanes, LED display controllers, and telecom line cards requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74LVC244ADBRG4 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 decades of expertise in high-reliability interface ICs.
The SN74LVC244ADBRG4 belongs to TI's LVC logic family, engineered for low-voltage, high-speed bus interfacing in industrial, computing, and communications equipment where signal integrity and mixed-voltage compatibility are essential.
FAQ
What is the maximum input voltage rating for SN74LVC244ADBRG4?
The SN74LVC244ADBRG4 supports input voltages up to 5.5V across its entire operating VCC range (1.65V–3.6V), enabling direct interfacing with 5V logic without external level-shifting circuitry. This specification is confirmed in Section 5.3 of the official TI datasheet under "Recommended Operating Conditions" for VI, and applies regardless of whether VCC is at 1.65V or 3.6V. The device uses internal clamp diodes to safely handle overvoltage conditions within absolute maximum limits.
Does SN74LVC244ADBRG4 support hot-swap or live-insertion applications?
Yes, SN74LVC244ADBRG4 supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter a high-impedance state with leakage current limited to ±20µA (per Electrical Characteristics table), preventing back-drive current into powered subsystems. This behavior is explicitly documented in Section 7.3.2 ("Partial Power Down") and qualifies the SN74LVC244ADBRG4 for use in modular chassis, pluggable line cards, and field-replaceable units where components may be inserted or removed while system power remains active.
What is the propagation delay of SN74LVC244ADBRG4 at 3.3V operation?
The maximum propagation delay (tpd) of SN74LVC244ADBRG4 is 5.9ns at VCC = 3.3V ± 0.3V and TA = 25°C, as specified in Table 5.6 ("Switching Characteristics"). This value represents the worst-case delay from input transition to valid output transition under standard test conditions (CL = 50pF). At –40°C to +125°C, the max tpd increases to 7.2ns, ensuring timing predictability across full industrial temperature range.
Can SN74LVC244ADBRG4 be used as a level translator between 5V and 3.3V systems?
Yes, SN74LVC244ADBRG4 functions as a unidirectional down-translator: its 5.5V-tolerant inputs accept 5V logic levels while outputting referenced to VCC (e.g., 3.3V), as stated in Feature #8 and Section 7.3.3. It does not translate in the reverse direction (3.3V-out → 5V-in), and output voltage swing is bounded by VCC and GND. No external components are needed for this translation mode, making it suitable for interfacing 5V peripherals to 3.3V microcontrollers or FPGAs.
What package type is used for SN74LVC244ADBRG4?
SN74LVC244ADBRG4 uses the SSOP-20 (DB) package: a 20-pin shrink small-outline package with 0.65mm lead pitch, body dimensions of 7.2mm × 5.30mm, and overall footprint of 7.2mm × 7.8mm. This is confirmed in the "Package Information" table and Figure 4-2 of the TI datasheet. The "RG4" suffix denotes green (lead-free) RoHS-compliant finish, and "DB" is the official TI package code for this variant.
SN74LVC244ADBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
SN74LVC244ADBRG4 FAQ
1.How can I place an order for SN74LVC244ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC244ADBRG4 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 SN74LVC244ADBRG4 reliable?
The price and inventory of SN74LVC244ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC244ADBRG4 is usually 5 days.
3.What payment methods are accepted for SN74LVC244ADBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC244ADBRG4 transactions.
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4.How is shipping managed for SN74LVC244ADBRG4?
SN74LVC244ADBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC244ADBRG4 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 SN74LVC244ADBRG4?
For technical support, including SN74LVC244ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC244ADBRG4 requirements.
6.How does Aetrix verify that SN74LVC244ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVC244ADBRG4 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 SN74LVC244ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVC244ADBRG4?
All SN74LVC244ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC244ADBRG4, 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 SN74LVC244ADBRG4 part is unused and in its original packaging.
Return procedure for SN74LVC244ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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