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Texas Instruments SN74LVT244APWR
- Part No.:
- SN74LVT244APWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVT244APWR.pdf
- Description:
- BUS DRIVER, LVT SERIES, 4-BIT
- Quantity:
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Inventory:10,850
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Product details
Overview
SN74LVT244APWR from Texas Instruments is a 3.3-V advanced BiCMOS octal buffer/driver with dual 4-bit channels, 3-state outputs, bus-hold inputs, and mixed-mode 5-V/3.3-V interface capability. It operates from 2.7 V to 3.6 V, delivers ±64 mA output drive, and supports live insertion in backplane and hot-swap applications.
For engineers reviewing the SN74LVT244APWR datasheet, SN74LVT244APWR pinout, SN74LVT244APWR application, or SN74LVT244APWR equivalent, key selection criteria include 3-state timing (tPZH ≤ 6.3 ns), bus-hold input current (±75 µA), output ground bounce (VOLP < 0.8 V), and compatibility with 5-V TTL logic while powered at 3.3 V.
Technical Context
The SN74LVT244APWR implements two independent 4-bit noninverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Its ABT architecture enables robust 3.3-V operation with 5-V tolerant inputs and outputs, supporting mixed-voltage system interfacing without level shifters.
Bus-hold circuitry actively maintains valid logic states on unused A inputs without external pullups. Output enable sequencing ensures high-impedance state during power-up/down when OE is tied to VCC via a pullup resistor - minimum value determined by driver sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V with stable 3.3-V logic performance |
| IOL / IOH | 64 mA / –32 mA - drives heavy capacitive loads or multiple TTL inputs without external buffering |
| tPZH / tPLZ | 6.3 ns / 5.6 ns - fast 3-state enable/disable timing critical for bus arbitration and dynamic load switching |
| VOLP (Ground Bounce) | < 0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes in dense PCB layouts |
| Bus-Hold Current | ±75 µA at VI = 0.8 V or 2 V - eliminates need for external pullup/pulldown resistors on floating data lines |
| Input Voltage Tolerance | –0.5 V to 7 V - accepts 5-V TTL signals directly while powered at 3.3 V, enabling seamless voltage translation |
Pinout & Package
SN74LVT244APWR is housed in a 20-pin TSSOP (Thin Shrink Small-Outline Package), designated PW package per TI documentation, with 0.65 mm lead pitch and JEDEC MO-153 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Controls 4-bit group Y1–Y4 or Y1'–Y4'; low enables pass-through, high forces high-Z state |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with integrated bus-hold; no external termination required for idle lines |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Noninverting buffered outputs capable of sinking 64 mA or sourcing 32 mA |
| VCC | Power supply | 3.3-V nominal supply; supports operation down to 2.7 V with full I/O functionality |
| GND | Ground reference | Common return path for logic and output current; decoupling near pin 10 recommended |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5-V tolerant inputs/outputs operating from 3.3-V VCC - eliminates discrete level translators in hybrid systems |
| Integrated bus-hold | Active input stabilization on all eight A pins - removes risk of metastability and EMI from floating nodes |
| Live insertion support | Robust latch-up immunity (>500 mA per JESD-17) and controlled output transition behavior - safe for hot-plug backplane use |
| Low ground bounce | VOLP < 0.8 V ensures signal integrity in multi-driver shared-bus environments with tight ground return paths |
Applications
| Backplane Bus Interface | Hot-Swap Module Control |
|---|---|
Use Scenario: Interfacing 3.3-V FPGA I/O banks to legacy 5-V backplane buses in telecom line cards. IC Role / Device Role / Timing Role: Level-translating octal buffer providing bidirectional signal conditioning and bus isolation. Use Value: Eliminates external level shifters while maintaining 64 mA drive strength and sub-6 ns 3-state delay for precise bus arbitration timing. | Use Scenario: Enabling/disabling peripheral modules in industrial PLC carrier boards during live maintenance. IC Role / Device Role / Timing Role: 3-state driver controlling power-on sequencing and signal isolation for hot-pluggable I/O modules. Use Value: Bus-hold inputs prevent floating states during insertion; tPZH/tPLZ ≤ 6.3 ns ensures deterministic bus release before new module engagement. |
| Memory Address Buffering | Microcontroller Peripheral Expansion |
Use Scenario: Driving address lines from a 3.3-V ARM microcontroller to multiple 5-V SRAM chips in embedded instrumentation. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control synchronizing memory chip select and address latching. Use Value: 2.7–3.6 V VCC range accommodates brown-out conditions; VOLP < 0.8 V prevents address corruption during simultaneous output switching. | Use Scenario: Expanding GPIO count of a 3.3-V MCU to drive 5-V optocouplers and relay drivers in factory automation controllers. IC Role / Device Role / Timing Role: Logic-level translator and current booster for MCU output expansion with configurable channel enable. Use Value: Dual OE inputs allow independent control of two 4-bit groups - simplifies firmware-driven peripheral power gating and fault isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH244APW | Lower drive (±24 mA), higher tPLH/tPHL (7.5 ns), same PW package and bus-hold | Suitable for lower-speed, low-power systems where 64 mA drive is unnecessary | Select when reduced ICC (0.19 mA disabled) and lower EMI outweigh speed and drive requirements |
| 74ALVC244PW | No bus-hold, 3.3-V only I/O (not 5-V tolerant), identical PW package and pinout | Requires external pullups on unused inputs; limited to pure 3.3-V domains | Choose only in fully 3.3-V systems with controlled I/O routing and no floating node risk |
Compared with SN74LVTH244APW and 74ALVC244PW, the SN74LVT244APWR uniquely combines 5-V tolerance, 64 mA drive, and integrated bus-hold in a TSSOP package - making it the only option among the three for robust mixed-voltage hot-swap and backplane interface designs.
Availability
SN74LVT244APWR is available at Aetrix Electronics and suitable for backplane bus interface, hot-swap module control, and memory address buffering requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for SN74LVT244APWR 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 founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LVT244APWR belongs to TI's LVT (Low-Voltage Technology) ABT logic family, engineered for high-speed, low-noise 3.3-V system interfacing with legacy 5-V infrastructure in telecom, computing, and industrial control.
FAQ
What is the maximum output current rating for SN74LVT244APWR?
The SN74LVT244APWR supports up to 64 mA sink current (IOL) and –32 mA source current (IOH) per output under recommended operating conditions. These ratings apply at VCC = 3 V and ensure reliable driving of multiple TTL loads or moderate capacitive bus lines without thermal derating in the –40°C to 85°C range.
Does SN74LVT244APWR require external pullup resistors on its inputs?
No, SN74LVT244APWR does not require external pullup resistors on its A inputs due to integrated bus-hold circuitry, which actively maintains valid logic levels on unused or floating inputs. This feature eliminates board space and BOM cost associated with discrete termination components while preventing metastability in undriven signal paths.
Can SN74LVT244APWR interface between 3.3-V and 5-V logic systems?
Yes, SN74LVT244APWR supports mixed-mode signal operation: its inputs and outputs tolerate up to 7 V, allowing direct connection to 5-V TTL logic while powered from a 3.3-V supply. This eliminates external level-shifting components in hybrid voltage domain systems such as FPGA-to-legacy-peripheral interfaces.
What is the recommended power-up sequence for SN74LVT244APWR?
To ensure high-impedance outputs during power-up, tie both 1OE and 2OE to VCC through a pullup resistor - minimum resistance determined by the driver's current-sinking capability (typically ≤10 kΩ). This prevents bus contention before system firmware asserts valid enable states, a requirement explicitly stated in the SN74LVT244APWR functional description.
Which package type does SN74LVT244APWR use, and is it RoHS-compliant?
SN74LVT244APWR uses the 20-pin TSSOP (PW) package per TI's official documentation. As a Texas Instruments device manufactured post-2006 and distributed through authorized channels, SN74LVT244APWR meets RoHS Directive 2011/65/EU requirements, with lead-free terminations and compliant material declarations available in TI's QCD database.
SN74LVT244APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVT244APWR FAQ
1.How can I place an order for SN74LVT244APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT244APWR 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 SN74LVT244APWR reliable?
The price and inventory of SN74LVT244APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT244APWR is usually 5 days.
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SN74LVT244APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT244APWR 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 SN74LVT244APWR?
For technical support, including SN74LVT244APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT244APWR requirements.
6.How does Aetrix verify that SN74LVT244APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVT244APWR 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 SN74LVT244APWR meets industry standards.
7.What is the process for return or replacement of SN74LVT244APWR?
All SN74LVT244APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT244APWR, 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 SN74LVT244APWR part is unused and in its original packaging.
Return procedure for SN74LVT244APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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