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Texas Instruments SN74LVTH244APWRE4
- Part No.:
- SN74LVTH244APWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVTH244APWRE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,421
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Product details
Overview
SN74LVTH244APWRE4 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 backplane interface, memory address buffering, and industrial control bus isolation.
For engineers reviewing the SN74LVTH244APWRE4 datasheet, SN74LVTH244APWRE4 pinout, SN74LVTH244APWRE4 application, or SN74LVTH244APWRE4 equivalent, key selection criteria include its 20-pin TSSOP package, 3.3-V supply with 5-V tolerant I/O, ±100 µA Ioff, 0.55 V typical VOL at 64 mA, and bus-hold circuitry eliminating external pull resistors.
Technical Context
The SN74LVTH244APWRE4 implements two independent 4-bit noninverting buffers, each with dedicated output-enable (OE) control. Its ABT (Advanced BiCMOS Technology) architecture enables TTL-level compatibility while operating from a 3.3-V supply, supporting bidirectional voltage translation between 3.3-V logic domains and legacy 5-V systems.
Active bus-hold circuitry maintains valid logic states on floating inputs without external components, and the Ioff protection disables outputs during power-down to prevent current backflow. Power-up 3-state ensures high-impedance outputs during supply ramping, avoiding bus contention in hot-swap applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and tolerates supply droop in portable industrial systems. |
| IOL (max) | 64 mA - drives heavy capacitive loads or multiple TTL inputs without external amplification. |
| VOL (typ) | 0.55 V at IOL = 64 mA - ensures robust low-level noise margin in noisy industrial environments. |
| tPLH/tPHL | 2.3 ns / 2.1 ns at VCC = 3.3 V - enables high-speed data transfer in 32-bit address/data buses. |
| Ioff | ±100 µA - prevents damaging back-current flow when powered off in live-backplane configurations. |
| Bus-Hold Current | ±750 µA dynamic hold - actively sustains input logic state without external pullup/pulldown resistors. |
| ESD Rating | 2000-V HBM - meets industrial-grade ESD immunity requirements per JESD22-A114. |
Pinout & Package
TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 1.2 mm max height, 0.65 mm lead pitch, exposed thermal pad optional for enhanced thermal performance.
| 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 high-impedance state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for two independent 4-bit channels; feature integrated bus-hold circuitry. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive external buses or loads; enter high-Z when OE is high, preventing contention during bus arbitration. |
| VCC | Power supply | 3.3-V nominal supply; accepts 2.7–3.6 V range for battery-backed or brownout-tolerant designs. |
| GND | Ground reference | Common return path for all I/O and internal logic; requires low-impedance PCB plane for noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O tolerance | 5-V input/output voltage capability with 3.3-V VCC enables seamless interfacing between legacy 5-V peripherals and modern 3.3-V controllers. |
| Bus-hold circuitry | Eliminates need for 10-kΩ external pullup/pulldown resistors on all eight data inputs, reducing BOM count and board space. |
| Hot-insertion support | Ioff and power-up 3-state prevent current backflow and bus conflicts during live module replacement in telecom or server backplanes. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures stable switching margins under fast transient load conditions. |
| Latch-up immunity | >500 mA per JESD17 - guarantees robust operation in high-noise industrial motor-control or power-conversion environments. |
Applications
| Industrial Backplane Interface | Memory Address Buffering |
|---|---|
Use Scenario: Isolating microcontroller address lines from a shared 32-bit ISA-style backplane with multiple peripheral slots. IC Role / Device Role / Timing Role: Noninverting octal buffer providing level-shifted, high-drive-strength address propagation with bus-hold stability during slot insertion/removal. Use Value: Enables hot-plug expansion without system reset; eliminates 16 external pull resistors and reduces layout complexity by 28%. |
Use Scenario: Driving 12-bit address lines from an FPGA to parallel SRAM in a real-time motion controller. IC Role / Device Role / Timing Role: Low-propagation-delay (2.1 ns tPHL) buffer ensuring setup/hold timing compliance across temperature extremes. Use Value: Guarantees <1 ns timing margin at 100 MHz clock rates, preventing address skew-induced memory access errors. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
Use Scenario: Interfacing a 3.3-V MCU GPIO bank to 5-V CAN transceiver control signals and sensor power switches. IC Role / Device Role / Timing Role: Voltage-tolerant buffer enabling direct connection to 5-V subsystems without level-shifter ICs or discrete FETs. Use Value: Reduces component count by 3 devices per interface channel and improves EMC robustness via controlled edge rates. |
Use Scenario: Conditioning DUT I/O signals in automated test equipment where multiple voltage domains coexist on one fixture. IC Role / Device Role / Timing Role: Bidirectional signal isolator with configurable 3-state control for safe probing and signal injection sequences. Use Value: Prevents accidental short-circuits during test sequence transitions; supports 100% functional coverage without manual reconfiguration. |
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 vs. 64 mA), no bus-hold, no Ioff; LVC family, not ABT. | Suitable only for low-capacitance, non-hot-swap 3.3-V-only systems without floating inputs. | Select when cost is critical and full industrial hot-swap capability is unnecessary. |
| SN74ALVCH162244GR | 16-bit, dual-supply (1.65–3.6 V), no 5-V tolerance, higher pin count (56-pin RGY), no bus-hold. | Targets high-density, low-voltage memory interfaces-not mixed-voltage backplane isolation. | Choose only for wide-bus applications requiring 16-bit width and strict low-voltage operation. |
Compared with SN74LVC244APWR and SN74ALVCH162244GR, the SN74LVTH244APWRE4 uniquely delivers 5-V I/O tolerance, integrated bus-hold, and Ioff-enabled hot insertion in a compact 20-pin TSSOP-making it the sole option for ruggedized mixed-voltage industrial bus isolation.
Availability
SN74LVTH244APWRE4 is available at Aetrix Electronics and suitable for industrial backplane interface, memory address buffering, and automotive body control modules requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for SN74LVTH244APWRE4 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH244APWRE4 belongs to TI's LVTH (Low-Voltage BiCMOS Technology) logic family, engineered for mixed-voltage system interfacing, hot-swap reliability, and reduced board-level component count in mission-critical industrial control applications.
FAQ
What is the maximum output sink current supported by the SN74LVTH244APWRE4?
The SN74LVTH244APWRE4 supports up to 64 mA per output in the low state (IOL = 64 mA) at VCC = 3.3 V, enabling direct drive of multiple TTL loads or moderate-capacitance buses without external buffers. This rating is confirmed in the Electrical Characteristics table of the SCAS586J datasheet under recommended operating conditions.
Does the SN74LVTH244APWRE4 require external pullup resistors on its inputs?
No - the SN74LVTH244APWRE4 integrates active bus-hold circuitry on all eight data inputs, maintaining valid logic levels on unused or floating inputs without external pullup or pulldown resistors. Using external resistors with this feature is explicitly discouraged in the datasheet to avoid conflict and increased power consumption.
Can the SN74LVTH244APWRE4 be used in hot-swap applications?
Yes - the SN74LVTH244APWRE4 is fully specified for hot-insertion use via Ioff circuitry (±100 µA leakage when powered down) and power-up 3-state logic, which forces outputs into high-impedance during supply ramping. These features prevent damaging current backflow and bus contention in live-backplane systems like telecom shelves or modular PLCs.
What is the thermal resistance (θJA) of the SN74LVTH244APWRE4 in its TSSOP package?
The SN74LVTH244APWRE4 in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (θJA) of 83°C/W, as specified in the Absolute Maximum Ratings table of the SCAS586J datasheet. This value assumes standard JEDEC 2-layer board conditions and guides thermal design for continuous operation at full output loading.
Is the SN74LVTH244APWRE4 compatible with 5-V logic systems?
Yes - the SN74LVTH244APWRE4 supports mixed-mode signal operation: its inputs accept 0–5.5 V, and outputs drive 5-V TTL loads while powered from a 3.3-V supply. This allows direct interfacing between 3.3-V microcontrollers and legacy 5-V peripherals without level-shifting components, as confirmed in the device description and Recommended Operating Conditions table.
SN74LVTH244APWRE4 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
SN74LVTH244APWRE4 FAQ
1.How can I place an order for SN74LVTH244APWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH244APWRE4 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 SN74LVTH244APWRE4 reliable?
The price and inventory of SN74LVTH244APWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH244APWRE4 is usually 5 days.
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Once your SN74LVTH244APWRE4 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 SN74LVTH244APWRE4?
For technical support, including SN74LVTH244APWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH244APWRE4 requirements.
6.How does Aetrix verify that SN74LVTH244APWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244APWRE4 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 SN74LVTH244APWRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH244APWRE4?
All SN74LVTH244APWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244APWRE4, 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 SN74LVTH244APWRE4 part is unused and in its original packaging.
Return procedure for SN74LVTH244APWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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