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Texas Instruments SN74LVTH244ADBRE4
- Part No.:
- SN74LVTH244ADBRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH244ADBRE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,251
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Product details
Overview
SN74LVTH244ADBRE4 from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation between 5-V inputs and 3.3-V VCC. It features bus-hold on all data inputs, Ioff support for hot insertion, and operates down to 2.7 V. Used in backplane interface, memory address buffering, and level-shifting I/O expansion.
For engineers reviewing the SN74LVTH244ADBRE4 datasheet, SN74LVTH244ADBRE4 pinout, SN74LVTH244ADBRE4 application, or SN74LVTH244ADBRE4 equivalent, key selection criteria include its 20-pin SSOP (DB) package, ±100 µA Ioff, 3.3-V supply compatibility with 5-V tolerant inputs, and guaranteed 3-state behavior during power-up/down.
Technical Context
The SN74LVTH244ADBRE4 implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input. When OE is low, data passes from A inputs to Y outputs; when high, outputs enter high-impedance state. Active bus-hold circuitry maintains valid logic levels on floating inputs without external resistors.
Its Ioff protection disables outputs during power-down to prevent current backflow, while power-up 3-state ensures outputs remain high-Z during VCC ramp-up. Input voltage tolerance extends to 7 V, enabling direct interfacing with legacy 5-V systems while powered from 3.3-V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and accommodates typical 3.3-V rail tolerances. |
| IOL (max) | 64 mA per output - drives standard TTL loads and enables fan-out to multiple downstream devices. |
| tPLH/tPHL | 2.3 ns / 2.1 ns at VCC = 3.3 V - ensures sub-3 ns propagation delay for high-speed address/data buffering. |
| VIH/VIL | 2.0 V / 0.8 V - compatible with both 3.3-V CMOS and 5-V TTL input thresholds. |
| Ioff | ±100 µA - blocks damaging current flow during hot-swap or partial power-down conditions. |
| Bus-Hold Current | ±750 µA (dynamic) - actively holds unused inputs at valid logic levels without external components. |
| ESD Rating | 2000-V HBM - exceeds JEDEC JESD22-A114A for robust handling in manufacturing and field environments. |
Pinout & Package
SN74LVTH244ADBRE4 uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch and 7.4 mm × 5.3 mm body size. Pin 1 is marked by a notch or dot; device orientation follows JEDEC MO-150 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 4-bit buffer sections; tied to VCC via pullup for safe power-up state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with integrated bus-hold; tolerate up to 7 V regardless of VCC. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Noninverting buffered outputs; high-impedance when corresponding OE is high. |
| VCC (Pin 10) | Power supply | 3.3-V nominal supply; supports operation down to 2.7 V with full functionality. |
| GND (Pin 11) | Ground reference | Common return path for all logic and output currents; decoupling required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs with 3.3-V VCC enable seamless interconnection between legacy 5-V logic and modern low-voltage systems. |
| Bus-hold circuitry | Eliminates need for external pullup/pulldown resistors on all eight data inputs, reducing BOM count and board space. |
| Ioff and power-up 3-state | Prevents current backflow during hot insertion and guarantees high-impedance outputs during power sequencing. |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes in dense PCB layouts. |
| Latch-up immunity | >500 mA per JESD17 - ensures robust operation under transient overvoltage or ESD stress events. |
Applications
| Backplane Interface Buffering | Memory Address Expansion |
|---|---|
|
Use Scenario: Isolating and driving address/data lines across a multi-slot industrial backplane with mixed 3.3-V and 5-V card voltages. IC Role / Device Role / Timing Role: Noninverting octal buffer providing level translation and drive strength enhancement between slots. Use Value: Enables reliable communication without external level shifters or pull resistors, leveraging built-in 5-V-tolerant inputs and bus-hold. |
Use Scenario: Expanding microcontroller address bus to access external SRAM or flash memory in embedded instrumentation. IC Role / Device Role / Timing Role: Address line driver with fast 2.1 ns tPHL ensuring setup/hold timing margins for parallel memory interfaces. Use Value: Delivers 64 mA sink current per output to meet memory chip input requirements while maintaining sub-3 ns propagation delay. |
| Hot-Swappable I/O Module | Legacy System I/O Bridge |
|
Use Scenario: Supporting live insertion/removal of peripheral modules in telecom shelf management systems. IC Role / Device Role / Timing Role: Signal isolator using Ioff and power-up 3-state to prevent bus contention during module power transitions. Use Value: Eliminates risk of damaging current flow between powered and unpowered subsystems, certified per JESD78. |
Use Scenario: Interfacing a 3.3-V FPGA to legacy 5-V peripheral controllers in industrial PLC backplanes. IC Role / Device Role / Timing Role: Bidirectional level translator for control signals (e.g., chip select, write enable) with no direction pin required. Use Value: Accepts 5-V inputs directly while sourcing/sinking 3.3-V-compatible currents, avoiding discrete transistor solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower drive strength (24 mA IOL), no bus-hold, 1.65–3.6 V VCC range | Suitable for lower-power, cost-sensitive designs where external pull resistors are acceptable | Select when reduced power consumption and wider VCC range outweigh need for bus-hold and higher drive. |
| SN74ALVC244PWR | Higher speed (tPD ≈ 2.0 ns), 1.65–3.6 V VCC, no bus-hold, lower IOL (24 mA) | Better for high-frequency clock distribution or timing-critical paths where bus-hold is not needed | Choose for sub-2.5 ns propagation in compact 3.3-V-only systems; requires external biasing for floating inputs. |
Compared with SN74LVC244APWR and SN74ALVC244PWR, the SN74LVTH244ADBRE4 provides superior drive capability (64 mA), integrated bus-hold, and guaranteed 5-V input tolerance-making it uniquely suited for mixed-voltage backplane and hot-swap applications where reliability and design simplicity are critical.
Availability
SN74LVTH244ADBRE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address expansion, hot-swappable I/O modules, and legacy system bridging requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVTH244ADBRE4 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.
The SN74LVTH244ADBRE4 belongs to TI's ABT (Advanced BiCMOS Technology) logic family, engineered for robust mixed-voltage system interfacing, hot-swap readiness, and industrial-grade ESD/latch-up performance.
FAQ
What is the maximum input voltage rating for SN74LVTH244ADBRE4?
The SN74LVTH244ADBRE4 supports input voltages up to 7 V regardless of VCC level, enabling direct connection to 5-V TTL outputs while operating from a 3.3-V supply. This is explicitly specified in the Absolute Maximum Ratings table and confirmed across all recommended operating conditions in the datasheet.
Does SN74LVTH244ADBRE4 require external pullup resistors on its inputs?
No, SN74LVTH244ADBRE4 includes active bus-hold circuitry on all eight data inputs, eliminating the need for external pullup or pulldown resistors. The bus-hold current (±750 µA dynamic) actively maintains valid logic states on floating inputs, reducing component count and layout complexity.
Can SN74LVTH244ADBRE4 be used in hot-swap applications?
Yes, SN74LVTH244ADBRE4 is fully specified for hot-insertion use via its Ioff protection and power-up 3-state features. When VCC = 0 V, Ioff limits current to ±100 µA, and the outputs remain in high-impedance state during power ramp-up, preventing bus conflicts during live module insertion.
What is the thermal resistance (θJA) of the SN74LVTH244ADBRE4 package?
The SN74LVTH244ADBRE4 in the SSOP (DB) package has a junction-to-ambient thermal resistance (θJA) of 70°C/W, as specified in the Absolute Maximum Ratings section. This value assumes standard JEDEC test board conditions and guides thermal design for continuous operation at rated load.
How does the output-enable logic work on SN74LVTH244ADBRE4?
SN74LVTH244ADBRE4 has two independent active-low output-enable inputs: 1OE controls Y1–Y4, and 2OE controls Y5–Y8. When an OE input is low, the corresponding four outputs pass data from A inputs to Y outputs; when high, those outputs enter high-impedance state. OE pins must be held at VCC or GND for stable operation.
SN74LVTH244ADBRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVTH244ADBRE4 FAQ
1.How can I place an order for SN74LVTH244ADBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH244ADBRE4 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 SN74LVTH244ADBRE4 reliable?
The price and inventory of SN74LVTH244ADBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244ADBRE4 is usually 5 days.
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Once your SN74LVTH244ADBRE4 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 SN74LVTH244ADBRE4?
For technical support, including SN74LVTH244ADBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244ADBRE4 requirements.
6.How does Aetrix verify that SN74LVTH244ADBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244ADBRE4 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 SN74LVTH244ADBRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH244ADBRE4?
All SN74LVTH244ADBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244ADBRE4, 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 SN74LVTH244ADBRE4 part is unused and in its original packaging.
Return procedure for SN74LVTH244ADBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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