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Texas Instruments SN74LVTH244APWRG4
- Part No.:
- SN74LVTH244APWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH244APWRG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,026
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Product details
Overview
SN74LVTH244APWRG4 from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode signal operation (5-V inputs/outputs with 3.3-V VCC). It features bus-hold on all data inputs, Ioff and power-up 3-state for hot insertion, and supports unregulated battery operation down to 2.7 V. Used in industrial backplane interfaces and legacy TTL-to-3.3-V level translation.
For engineers reviewing the SN74LVTH244APWRG4 datasheet, SN74LVTH244APWRG4 pinout, SN74LVTH244APWRG4 application, or SN74LVTH244APWRG4 equivalent, key selection criteria include its 20-pin TSSOP package, ±100 µA Ioff current, 0.55 V typical VOL at 64 mA, bus-hold input retention, and compatibility with 5-V tolerant inputs in 3.3-V systems.
Technical Context
The SN74LVTH244APWRG4 implements two independent 4-bit noninverting buffer sections, each with dedicated output-enable (OE) control. Its ABT (Advanced BiCMOS Technology) architecture delivers high drive strength while maintaining low power consumption and robust noise immunity.
It integrates active bus-hold circuitry on all eight A-inputs to maintain valid logic states without external pull resistors, and employs Ioff protection to disable outputs during power-down, preventing backflow current. Power-up 3-state ensures outputs remain high-impedance until VCC stabilizes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports wide-input unregulated battery rails and tolerates supply droop during transient load conditions. |
| IOL (max) | 64 mA per output - enables direct driving of heavy capacitive loads or multiple TTL inputs without external buffering. |
| VOH (min) | 2.0 V at IOH = −32 mA - ensures reliable high-level recognition by downstream 3.3-V CMOS or TTL receivers. |
| tPZH (max) | 5.3 ns at VCC = 3.3 V - guarantees fast output enable timing critical for burst-mode bus arbitration and memory-mapped I/O. |
| Ioff | ±100 µA - prevents damaging current flow when device is powered off but system buses remain live at 5 V. |
| Bus-Hold Current | ±750 µA dynamic hold - actively maintains stable logic state on floating inputs, eliminating need for 10-kΩ external bias resistors. |
| ESD Rating | 2000-V HBM - meets industrial-grade ESD robustness requirements without additional protection circuitry. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, 1.2 mm max height, exposed thermal pad optional for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 4-bit buffer sections; tied high via pullup for safe power-up high-Z state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight 5-V-tolerant inputs with integrated bus-hold; accept TTL-level signals directly into 3.3-V system. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | Noninverting 3-state outputs capable of sinking 64 mA or sourcing 32 mA at 3.3 V. |
| VCC (Pin 10) | Power supply | 3.3-V core supply; decoupling capacitor required within 10 mm for stable switching performance. |
| GND (Pin 20) | Ground reference | Primary return path for all I/O and supply currents; must be connected to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V input tolerance | Accepts 0–5.5 V input signals while operating from 3.3-V VCC, enabling seamless interface between legacy 5-V peripherals and modern low-voltage controllers. |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on all eight data inputs, reducing BOM count and PCB area in space-constrained designs. |
| Hot-insertion support | Ioff and power-up 3-state prevent backdrive and bus contention during live board insertion, meeting IEEE 1184 compliance requirements. |
| Low ground bounce (VOLP) | <0.8 V typical at VCC = 3.3 V - minimizes noise coupling into adjacent signal lines during high-current switching events. |
| Latch-up immunity | >500 mA per JESD 17 - ensures robust operation in electrically noisy industrial environments with transient voltage spikes. |
Applications
| Industrial Backplane Interface | Legacy System Level Translation |
|---|---|
|
Use Scenario: Interfacing a 3.3-V microcontroller to a 5-V ISA-style backplane with multiple peripheral slots. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer isolating controller I/O from noisy backplane signals while preserving timing integrity. Use Value: Eliminates discrete level-shifter ICs and pull resistors, reducing component count by 6+ parts per interface channel. |
Use Scenario: Upgrading aging test equipment control boards from 5-V TTL logic to energy-efficient 3.3-V FPGAs. IC Role / Device Role / Timing Role: Noninverting buffer with 5-V-tolerant inputs translating FPGA GPIO outputs to legacy TTL-compatible control lines. Use Value: Maintains full 3.3-V logic speed (sub-4 ns propagation delay) while accepting existing 5-V sensor/actuator signals without redesign. |
| Hot-Swappable Module Control | Embedded Data Acquisition Bus |
|
Use Scenario: Managing power sequencing and status signaling for field-replaceable compute modules in telecom chassis. IC Role / Device Role / Timing Role: Hot-insertion-safe 3-state driver controlling module reset, presence detect, and configuration bus lines. Use Value: Ioff protection prevents backfeed damage during module insertion/removal; bus-hold retains last-known state during brief disconnects. |
Use Scenario: Buffering analog-to-digital converter (ADC) parallel output data to a 3.3-V processor in an isolated measurement front-end. IC Role / Device Role / Timing Role: High-drive octal buffer driving 100-pF trace capacitance across 15 cm PCB run with minimal skew. Use Value: 64 mA sink capability ensures clean signal edges at 20 MHz sampling rates; low VOL guarantees reliable low-level detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | No bus-hold; lower drive (24 mA), 1.65–3.6 V VCC; no 5-V input tolerance. | Suitable only for pure 3.3-V systems with externally biased inputs; cannot replace SN74LVTH244APWRG4 in mixed-voltage environments. | Select when cost reduction is prioritized over 5-V interface capability and bus-hold convenience. |
| 74ALVC244PW | Higher speed (tPD ≈ 2.8 ns), same VCC range, no bus-hold, no 5-V tolerance. | Optimized for high-frequency clock distribution or fast data paths where input biasing is already implemented. | Choose only if propagation delay <3 ns is mandatory and external pull resistors are acceptable. |
Compared with SN74LVC244APWR and 74ALVC244PW, the SN74LVTH244APWRG4 uniquely combines 5-V input tolerance, integrated bus-hold, and hot-insertion safety-making it irreplaceable in legacy-to-modern interface and field-serviceable system designs.
Availability
SN74LVTH244APWRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded data acquisition buses, hot-swappable module control, and legacy system level translation requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVTH244APWRG4 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 industrial-grade logic and interface solutions.
The SN74LVTH244APWRG4 belongs to TI's ABT logic family, engineered specifically for robust mixed-voltage interfacing in harsh industrial and telecom environments where reliability, hot-swap capability, and legacy compatibility are critical.
FAQ
What is the maximum allowable input voltage on the A-inputs of SN74LVTH244APWRG4?
The SN74LVTH244APWRG4 supports input voltages up to 5.5 V on all A-inputs, regardless of VCC level. This 5-V tolerance allows direct connection to legacy TTL or 5-V microcontroller outputs without external level-shifting circuitry, making the SN74LVTH244APWRG4 ideal for mixed-voltage system integration.
Does SN74LVTH244APWRG4 require external pullup resistors on its data inputs?
No. The SN74LVTH244APWRG4 includes active bus-hold circuitry on all eight A-inputs, which maintains a valid logic state on floating or unused inputs. Using external pullup or pulldown resistors with the SN74LVTH244APWRG4 is explicitly discouraged in the datasheet, as it may interfere with bus-hold functionality and increase power consumption.
Can SN74LVTH244APWRG4 be used in hot-plug applications?
Yes. The SN74LVTH244APWRG4 incorporates both Ioff protection and power-up 3-state circuitry, enabling safe hot insertion into live backplanes or carrier cards. During power-down, Ioff disables outputs to prevent backflow current; during power-up, outputs remain in high-impedance until VCC reaches operational threshold - a key feature of the SN74LVTH244APWRG4 for modular system architectures.
What is the thermal resistance (θJA) of SN74LVTH244APWRG4 in its TSSOP package?
The SN74LVTH244APWRG4 in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (θJA) of 83°C/W under standard JEDEC conditions. This value assumes a two-layer PCB with 1-in² copper pour; adding thermal vias to the exposed pad (if present) or increasing copper area can reduce effective θJA by up to 25% in optimized layouts.
How does the bus-hold feature of SN74LVTH244APWRG4 improve system reliability?
The bus-hold circuitry in the SN74LVTH244APWRG4 actively drives floating inputs to their last-valid logic state using ±750 µA dynamic current, preventing metastability and unintended toggling during signal transitions or connector mating. This eliminates susceptibility to EMI-induced glitches and removes dependency on precise external resistor values - a design advantage unique to the SN74LVTH244APWRG4 among pin-compatible octal buffers.
SN74LVTH244APWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LVTH244APWRG4 FAQ
1.How can I place an order for SN74LVTH244APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH244APWRG4 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 SN74LVTH244APWRG4 reliable?
The price and inventory of SN74LVTH244APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244APWRG4 is usually 5 days.
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Once your SN74LVTH244APWRG4 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 SN74LVTH244APWRG4?
For technical support, including SN74LVTH244APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244APWRG4 requirements.
6.How does Aetrix verify that SN74LVTH244APWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244APWRG4 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 SN74LVTH244APWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH244APWRG4?
All SN74LVTH244APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244APWRG4, 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 SN74LVTH244APWRG4 part is unused and in its original packaging.
Return procedure for SN74LVTH244APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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