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Texas Instruments SN74LVTH244ARGYR
- Part No.:
- SN74LVTH244ARGYR
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
SN74LVTH244ARGYR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,568
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Product details
Overview
SN74LVTH244ARGYR 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 systems. It features bus-hold on all data inputs, Ioff support for hot insertion, and operates down to 2.7 V supply voltage. Used in backplane interface, memory address buffering, and legacy bus translation where level-shifting and output isolation are required.
For engineers reviewing the SN74LVTH244ARGYR datasheet, SN74LVTH244ARGYR pinout, SN74LVTH244ARGYR application, or SN74LVTH244ARGYR equivalent, key selection criteria include its 20-pin VQFN (RGY) package with exposed thermal pad, ±100 µA Ioff specification at 0 V VCC, 3.3-V-compatible 5-V-tolerant inputs, and guaranteed 3-state enable timing (tPZH/tPZL ≤ 5.3 ns at VCC = 3.3 V).
Technical Context
The SN74LVTH244ARGYR implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control - 1OE for Y1–Y4 and 2OE for Y1–Y4 of the second group. Its ABT (Advanced BiCMOS Technology) architecture delivers TTL-compatible output drive (64 mA sink, 32 mA source) while maintaining 3.3-V logic thresholds and low ground bounce (VOLP < 0.8 V).
Bus-hold circuitry actively maintains valid logic levels on floating A-inputs without external resistors, and Ioff + power-up 3-state functionality prevents current backflow and driver contention during hot-plug events. The device meets JESD 17 latch-up immunity (>500 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and brownout resilience |
| IOL / IOH | 64 mA / 32 mA - drives standard TTL loads directly without external buffers |
| tPLH / tPHL | 2.3 ns / 2.1 ns (typ, VCC = 3.3 V) - enables high-speed bus interfacing up to ~200 MHz effective toggle rate |
| VIH / VIL | 2.0 V / 0.8 V - accepts 5-V TTL input levels while powered from 3.3 V |
| θJA | 37°C/W - low thermal resistance due to RGY package's exposed thermal pad, enabling sustained 64-mA per-output operation |
| IOFF | ±100 µA (VCC = 0 V) - blocks damaging back-current during hot-insertion or partial power-down |
| Bus-Hold Current | ±750 µA (dynamic hold) - maintains stable logic state on unused inputs without pull resistors |
Pinout & Package
VQFN-20 (RGY) package: 3.5 mm × 4.5 mm, 0.5 mm pitch, 1.0 mm max height, with exposed thermal pad (Pin 21) requiring PCB solder connection for thermal and mechanical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 17, 18, 19, 20 | Data Inputs (1A1–1A4, 2A1–2A4) | Noninverting input terminals for respective buffer channels; tolerate 5-V inputs at 3.3-V VCC |
| 5, 6, 7, 8, 11, 12, 13, 14 | Outputs (1Y1–1Y4, 2Y1–2Y4) | 3-state buffered outputs; high-impedance when corresponding OE is high |
| 9, 16 | Output Enables (1OE, 2OE) | Active-low controls; both must be low for output drivers to pass data; tied to VCC via pullup for safe power-up |
| 10 | GND | Ground reference for all logic and output stages |
| 15 | VCC | 3.3-V supply input; decoupling capacitor required near pin |
| 21 | Thermal Pad | Exposed copper pad - must be soldered to PCB ground plane for thermal dissipation and mechanical reliability |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Accepts 5-V TTL inputs while operating from 3.3-V VCC - eliminates level-shifters in legacy-to-modern system interconnects |
| Integrated bus-hold circuitry | Holds floating A-inputs at valid logic levels - removes need for 10-kΩ external pullup/pulldown resistors and saves board space |
| Hot-insertion support | Ioff + power-up 3-state ensures zero current backflow and no bus conflict during live card insertion/removal |
| Low ground bounce (VOLP) | <0.8 V at VCC = 3.3 V, TA = 25°C - reduces noise coupling into adjacent signals and improves signal integrity |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - ensures robust operation in noisy industrial environments with transient overvoltage |
Applications
| Backplane Bus Interface | Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating and driving address/data lines across a multi-slot backplane with mixed-voltage cards. IC Role / Device Role / Timing Role: Octal buffer providing 3-state isolation between slots; enables time-multiplexed bus sharing. Use Value: 5-V-tolerant inputs accept legacy controller outputs; 3.3-V outputs drive modern slot peripherals; bus-hold prevents glitches on disconnected slots. |
Use Scenario: Buffering microcontroller address lines to SRAM or Flash memory with strict setup/hold timing. IC Role / Device Role / Timing Role: Noninverting driver delivering fast, low-skew address propagation (tPLH/tPHL ≤ 2.3 ns typ). Use Value: 64-mA sink capability ensures clean logic transitions under capacitive load; low VOLP minimizes address decoding errors. |
| Legacy System Level-Shifting | Hot-Swappable I/O Module |
|
Use Scenario: Interfacing a 5-V FPGA I/O bank to a 3.3-V ASIC without discrete level translators. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating logic levels bidirectionally (input only) with minimal propagation delay. Use Value: Eliminates need for dual-supply translators; VI = 5.5 V rating allows direct connection to 5-V rails. |
Use Scenario: Enabling live replacement of sensor acquisition modules in industrial PLC backplanes. IC Role / Device Role / Timing Role: Output isolator using Ioff and power-up 3-state to prevent backfeeding and bus contention during insertion. Use Value: ±100 µA Ioff at VCC = 0 V blocks fault current; tPZH/tPZL ≤ 5.3 ns ensures rapid output disable on power ramp. |
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 (24 mA sink), no bus-hold, no Ioff, 1.65–3.6 V VCC range | Suitable for cost-sensitive, low-power 3.3-V-only systems without hot-swap or floating-input requirements | Choose when bus-hold and hot-insertion are unnecessary and lower BOM cost is prioritized |
| SN74ALVCH16244DGGR | 16-bit, dual-supply (1.65–3.6 V), no bus-hold, higher pin count (48-pin TSSOP), no Ioff | Targets wider buses in compact embedded controllers; lacks mixed-voltage tolerance and hot-swap protection | Choose for 16-bit parallel interfaces where 3.3-V-only operation and higher channel density are needed |
Compared with SN74LVC244APWR and SN74ALVCH16244DGGR, the SN74LVTH244ARGYR uniquely combines 5-V-tolerant inputs, integrated bus-hold, and Ioff-enabled hot insertion - making it irreplaceable in mixed-voltage backplane and field-replaceable module designs where signal integrity and live maintenance are critical.
Availability
SN74LVTH244ARGYR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem buffering, legacy-to-modern level-shifting, and hot-swappable I/O modules requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH244ARGYR 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 experience in high-reliability interface ICs.
The SN74LVTH244A product line was engineered for robust 3.3-V system interfacing in mixed-voltage environments - specifically targeting backplane, memory, and hot-plug applications where signal integrity, level translation, and fault resilience are essential.
FAQ
What is the maximum input voltage the SN74LVTH244ARGYR can tolerate on its A-inputs?
The SN74LVTH244ARGYR supports input voltages up to 5.5 V on all A-input pins, regardless of VCC level - enabling direct connection to 5-V TTL sources while operating from a 3.3-V supply. This 5-V tolerance is explicitly specified in the recommended operating conditions table and verified across temperature and voltage corners.
Does the SN74LVTH244ARGYR require external pullup resistors on its input pins?
No. The SN74LVTH244ARGYR includes active bus-hold circuitry on all A-inputs, which maintains a valid logic state when inputs float. Using external pullup or pulldown resistors with bus-hold enabled is not recommended, as it may cause excessive current draw or logic instability.
How does the SN74LVTH244ARGYR support hot insertion in backplane systems?
The SN74LVTH244ARGYR supports hot insertion via two complementary features: Ioff circuitry disables outputs when VCC = 0 V (blocking back-current), and power-up 3-state forces outputs into high-impedance during power ramp. Together, they prevent bus contention and damage during live card insertion - confirmed by JESD 78 testing and application note SCBA004.
What is the thermal performance advantage of the RGY package used in the SN74LVTH244ARGYR?
The SN74LVTH244ARGYR's VQFN-20 (RGY) package achieves θJA = 37°C/W - significantly lower than SOIC (58°C/W) or SSOP (70°C/W) variants - due to its exposed thermal pad. This allows sustained 64-mA per-output drive without exceeding junction temperature limits, critical for dense backplane layouts with limited airflow.
Can the SN74LVTH244ARGYR be used in systems powered below 3.3 V?
Yes. The SN74LVTH244ARGYR is fully specified from 2.7 V to 3.6 V VCC, supporting unregulated battery operation down to 2.7 V. All key parameters - including VOH ≥ 2.0 V, VOL ≤ 0.55 V, and tPLH/tPHL ≤ 3.8 ns - remain guaranteed across this range, enabling use in brownout-prone portable and automotive auxiliary systems.
SN74LVTH244ARGYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-VQFN (3.5x4.5)
SN74LVTH244ARGYR FAQ
1.How can I place an order for SN74LVTH244ARGYR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH244ARGYR 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 SN74LVTH244ARGYR reliable?
The price and inventory of SN74LVTH244ARGYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244ARGYR is usually 5 days.
3.What payment methods are accepted for SN74LVTH244ARGYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH244ARGYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH244ARGYR?
SN74LVTH244ARGYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH244ARGYR 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 SN74LVTH244ARGYR?
For technical support, including SN74LVTH244ARGYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244ARGYR requirements.
6.How does Aetrix verify that SN74LVTH244ARGYR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244ARGYR 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 SN74LVTH244ARGYR meets industry standards.
7.What is the process for return or replacement of SN74LVTH244ARGYR?
All SN74LVTH244ARGYR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244ARGYR, 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 SN74LVTH244ARGYR part is unused and in its original packaging.
Return procedure for SN74LVTH244ARGYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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