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Texas Instruments SN74LVTH244ADWR
- Part No.:
- SN74LVTH244ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH244ADWR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,011
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Product details
Overview
SN74LVTH244ADWR 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 3.3-V system interfacing with legacy 5-V buses, such as industrial control backplanes and embedded processor peripheral expansion.
For engineers reviewing the SN74LVTH244ADWR datasheet, SN74LVTH244ADWR pinout, SN74LVTH244ADWR application, or SN74LVTH244ADWR equivalent, key selection criteria include its 20-pin SOIC-DW package, ±100 µA Ioff current at VCC = 0 V, 32 mA IOL drive strength, bus-hold input retention, and compatibility with TTL-level signaling in low-voltage systems.
Technical Context
The SN74LVTH244ADWR implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input (1OE and 2OE). Its ABT (Advanced BiCMOS Technology) architecture delivers high-speed switching with low ground bounce (VOLP < 0.8 V at VCC = 3.3 V), while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VVIH = 2 V) and 5-V-tolerant I/O.
Active bus-hold circuitry eliminates external pullup/pulldown resistors on A-inputs, and the Ioff protection disables outputs during power-down to prevent backflow current. Power-up 3-state ensures outputs remain high-impedance during VCC ramp-up, 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 wide-input unregulated battery supply without regulation circuitry |
| IOL (max) | 64 mA - drives heavy capacitive loads or multiple TTL inputs without external buffering |
| tPZH/tPZL | 4.5 ns typical - fast output enable/disable timing minimizes bus turnaround latency |
| VI (max) | 5.5 V - enables direct connection to 5-V logic without level shifters |
| Ioff | ±100 µA - prevents damaging current flow when powered down in live backplane environments |
| Bus-Hold Current | ±750 µA - actively holds floating inputs at valid logic levels, eliminating external biasing |
| θJA | 58°C/W - SOIC-DW thermal performance enables reliable operation at 85°C ambient |
Pinout & Package
SN74LVTH244ADWR is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.75 mm height, with 0.65 mm lead pitch and Gull-wing leads. RoHS-compliant NIPDAU finish, MSL Level-1, tape-and-reel packaging (2000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Output-enable control inputs | Active-low enables respective 4-bit buffer groups; tied to VCC via pullup for safe power-up state |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight TTL-compatible inputs with integrated bus-hold; no external resistors required |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Noninverting outputs capable of sinking 64 mA or sourcing 32 mA at 3.3 V |
| VCC (Pin 10) | Power supply | 3.3-V nominal supply; supports down to 2.7 V for brownout tolerance |
| GND (Pin 20) | Ground reference | Common return path for all I/O and internal logic; decoupling capacitor required adjacent to Pin 10 |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Accepts 5-V inputs and drives 5-V loads while operating from 3.3-V VCC, enabling seamless interoperation between voltage domains |
| Integrated bus-hold | 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 backfeed current and bus contention during live card insertion into powered backplanes |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures signal integrity during simultaneous output switching in noise-sensitive systems |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - robust against transient overcurrent events in industrial environments |
Applications
| Industrial Backplane Interface | Embedded Processor Peripheral Expansion |
|---|---|
|
Use Scenario: Connecting a 3.3-V microcontroller to legacy 5-V ISA-style backplane peripherals. IC Role / Device Role / Timing Role: Level-shifting octal buffer isolating MCU GPIO from noisy 5-V bus signals while providing drive strength. Use Value: Eliminates discrete level translators and pull resistors; bus-hold prevents floating inputs during reset or firmware hang. |
Use Scenario: Expanding GPIO count on an ARM-based industrial PLC using a 5-V peripheral module. IC Role / Device Role / Timing Role: Bidirectional data path buffer with independent OE control for time-multiplexed address/data lines. Use Value: 4.5 ns enable/disable delay allows tight timing control; Ioff protects MCU during hot-swap of I/O modules. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing a 3.3-V CAN controller MCU to 5-V analog sensor multiplexers and relay drivers. IC Role / Device Role / Timing Role: Unidirectional signal conditioner for digital control lines with ESD-hardened I/O. Use Value: 2000-V HBM ESD rating meets automotive requirements; 2.7–3.6 V VCC range accommodates vehicle battery fluctuations. |
Use Scenario: Isolating DUT signals from automated test equipment (ATE) during functional testing of mixed-voltage boards. IC Role / Device Role / Timing Role: Reconfigurable buffer stage enabling test pattern injection and response capture across voltage domains. Use Value: Independent OE pins allow precise per-group enable timing; 5.5-V input tolerance prevents damage from test fixture overshoot. |
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 IOL), no bus-hold, 1.65–3.6 V VCC; lacks Ioff and hot-insertion support | Suitable only for static 3.3-V-only systems without hot-swap or floating-input concerns | Select when cost and power are prioritized over robustness in benign environments |
| SN74ALVC244PWR | Higher speed (tPD = 2.8 ns typ), 1.65–3.6 V VCC, no bus-hold or Ioff; 5-V tolerant inputs only (not outputs) | Applicable where 5-V input compatibility is needed but 5-V output drive is not required | Choose for high-speed 3.3-V bus extension where legacy 5-V load driving is unnecessary |
Compared with SN74LVC244APWR and SN74ALVC244PWR, the SN74LVTH244ADWR uniquely combines 5-V output drive capability, integrated bus-hold, and Ioff-enabled hot insertion-making it the only option among the three qualified for mixed-voltage backplane interfaces requiring reliability under dynamic power conditions.
Availability
SN74LVTH244ADWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded peripheral expansion, automotive body control modules, and ATE signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SN74LVTH244ADWR 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, automotive, and communications IC design.
The SN74LVTH244ADWR belongs to TI's LVTH (Low-Voltage TTL) logic family, engineered specifically for robust 3.3-V system interfacing with legacy 5-V infrastructure-emphasizing mixed-signal compatibility, hot-swap resilience, and reduced external component count.
FAQ
What is the maximum input voltage the SN74LVTH244ADWR can tolerate on its A-inputs?
The SN74LVTH244ADWR supports input voltages up to 5.5 V on all data (A) and control (OE) inputs, regardless of VCC level. This 5-V tolerance enables direct connection to legacy 5-V logic families without external level-shifting circuitry, a key feature confirmed in the Absolute Maximum Ratings table and Functional Description section of the SCAS586J datasheet.
Does the SN74LVTH244ADWR require external pullup resistors on its inputs?
No, the SN74LVTH244ADWR does not require external pullup or pulldown resistors on its A-inputs due to integrated active bus-hold circuitry. Each input maintains a valid logic state when floating, with ±750 µA dynamic hold current specified at VCC = 3.6 V. Using external resistors with bus-hold enabled is explicitly discouraged in the datasheet.
Can the SN74LVTH244ADWR be used in hot-swap applications?
Yes, the SN74LVTH244ADWR is fully specified for hot-insertion applications. Its Ioff circuitry disables outputs when VCC = 0 V (±100 µA leakage), and power-up 3-state ensures outputs remain high-impedance during VCC ramp-up-preventing bus conflicts and backfeed current when inserted into a live backplane.
What is the thermal resistance (θJA) of the SN74LVTH244ADWR in its SOIC-DW package?
The SN74LVTH244ADWR in the SOIC-DW (DW) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC PCB mounting conditions and confirms suitability for continuous operation at 85°C ambient temperature with appropriate PCB copper area.
How many independent output-enable controls does the SN74LVTH244ADWR provide?
The SN74LVTH244ADWR provides two independent active-low output-enable inputs: 1OE (Pin 1) controls the first four buffers (1A1→1Y1 through 1A4→1Y4), and 2OE (Pin 19) controls the second group (2A1→2Y1 through 2A4→2Y4). This dual-OE architecture enables selective activation of either 4-bit segment, supporting time-multiplexed bus sharing or partial subsystem isolation.
SN74LVTH244ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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-SOIC
SN74LVTH244ADWR FAQ
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6.How does Aetrix verify that SN74LVTH244ADWR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH244ADWR 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 SN74LVTH244ADWR meets industry standards.
7.What is the process for return or replacement of SN74LVTH244ADWR?
All SN74LVTH244ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH244ADWR, 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 SN74LVTH244ADWR part is unused and in its original packaging.
Return procedure for SN74LVTH244ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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