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Texas Instruments SN74LVTT244PWLE
- Part No.:
- SN74LVTT244PWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVTT244PWLE.pdf
- Description:
- BUS DRIVER, LVT SERIES, 4-BIT
- Quantity:
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Inventory:9,000
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Product details
Overview
SN74LVTT244PWLE from Texas Instruments is a 3.3-V Advanced BiCMOS Technology (ABT) octal buffer/driver with 3-state outputs, designed for mixed-mode interfacing between 3.3-V logic and 5-V TTL systems. It features dual 4-bit channels, independent output-enable (OE) controls, ±64 mA output drive at VCC = 3.3 V, and operation down to 2.7 V for battery-powered applications.
For engineers reviewing the SN74LVTT244PWLE datasheet, SN74LVTT244PWLE pinout, SN74LVTT244PWLE application, or SN74LVTT244PWLE equivalent, key selection considerations include 3.3-V supply compatibility, 5-V tolerant inputs/outputs, high-current 3-state drive capability, and support for live insertion in hot-swap backplane designs.
Technical Context
The SN74LVTT244PWLE implements two independent 4-bit noninverting buffer sections, each controlled by its own active-low OE input. Its ABT architecture enables robust 5-V signal handling while operating from a 3.3-V supply, eliminating level-shifter requirements in mixed-voltage bus interfaces.
It delivers rail-to-rail output swing with VOH ≥ 2.4 V (IOL = 24 mA) and VOL ≤ 0.55 V (IOL = 64 mA), supports live insertion via controlled output enable sequencing, and meets JEDEC JESD-17 latch-up immunity (>500 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Enables stable operation across unregulated Li-ion battery discharge profiles. |
| Input Voltage Tolerance | –0.5 V to 7 V - Supports direct connection to 5-V TTL buses without external clamping. |
| IOL / IOH | 64 mA / –32 mA - Drives heavy capacitive loads (e.g., 10+ TTL inputs) or long PCB traces. |
| tPLH / tPHL | 2.5 ns typical - Meets timing budgets for 100-MHz bus clock domains with margin. |
| ICC (Active) | 12 mA max at VCC = 3.6 V - Low static power enables use in thermally constrained embedded modules. |
| IOZH / IOZL | ±5 µA max - Ensures minimal leakage current in high-impedance state for low-power sleep modes. |
Pinout & Package
SN74LVTT244PWLE is housed in a 20-pin Thin Shrink Small-Outline (PW) package with 0.65 mm pitch, 7.2 mm × 4.4 mm footprint, and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 and Channel 2; must be pulled up to VCC for safe power-up behavior. |
| 2–5, 11–14 | 1A1–1A4, 2A1–2A4 | Noninverting data inputs; accept 5-V-tolerant signals while powered from 3.3 V. |
| 6–9, 15–18 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs; drive 5-V loads with 64 mA sink capability and <0.55 V VOL. |
| 10 | GND | Ground reference for all I/O and internal circuitry; requires low-inductance connection to minimize ground bounce. |
| 20 | VCC | 3.3-V supply input; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5-V input/output tolerance with 3.3-V VCC eliminates external level shifters in legacy system upgrades. |
| Live insertion support | Controlled output enable and latch-up immunity (>500 mA) allow safe hot-plug into powered backplanes. |
| Low ground bounce | VOLP < 0.8 V ensures signal integrity during simultaneous switching of multiple outputs. |
| Low-power ABT design | ICC ≤ 12 mA active and ≤ 0.19 mA disabled enables energy-efficient operation in portable equipment. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing a modern 3.3-V FPGA to an existing 5-V ISA or VME bus in factory automation controllers. IC Role / Device Role / Timing Role: Bidirectional voltage-level translation and bus buffering with 3-state isolation during arbitration. Use Value: Eliminates discrete resistor networks or dedicated level translators, reducing BOM count and layout area. |
Use Scenario: Adding new 3.3-V peripheral modules to aging 5-V microcontroller-based test equipment. IC Role / Device Role / Timing Role: Unidirectional data driver enabling clean signal propagation across mixed-voltage board interconnects. Use Value: Maintains TTL-compatible timing margins (tPLH/tPHL ≤ 4.1 ns) while supporting 64 mA drive per line. |
| Hot-Swappable Module Carrier | Battery-Powered Data Acquisition |
|
Use Scenario: Slot-based modular instrumentation where cards are inserted/removed while main chassis remains powered. IC Role / Device Role / Timing Role: Output isolation gate preventing bus contention and backfeeding during card insertion/removal. Use Value: JEDEC JESD-17 latch-up immunity and controlled enable sequencing prevent system lockup or damage. |
Use Scenario: Portable sensor node with 3.3-V MCU communicating over 5-V RS-485 or parallel ADC interface. IC Role / Device Role / Timing Role: Level-shifting buffer sustaining reliable operation as battery voltage drops from 3.6 V to 2.7 V. Use Value: Guaranteed functionality across full 2.7–3.6 V range avoids brown-out resets or signal degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APW | Lower drive strength (24 mA sink), no 5-V tolerance - requires external clamping for 5-V inputs. | Suitable only for pure 3.3-V systems; not viable for mixed-voltage interfacing. | Select when cost and power are prioritized over voltage compatibility and drive capability. |
| SN74ALVC244PW | Higher speed (tPD ≤ 3.3 ns), but limited 3.6-V absolute max VCC and no 5-V input tolerance. | Cannot replace SN74LVTT244PWLE in 5-V bus environments without redesign. | Choose for high-speed 3.3-V-only applications where timing margin is critical. |
Compared with SN74LVC244APW and SN74ALVC244PW, the SN74LVTT244PWLE uniquely combines 5-V input/output tolerance, 64 mA drive, and 2.7–3.6 V operation - making it the only drop-in solution for upgrading legacy 5-V systems with modern low-voltage logic without modifying signal conditioning or power architecture.
Availability
SN74LVTT244PWLE is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-swappable module carriers, and battery-powered data acquisition systems requiring stable component supply and long-term obsolescence management.
Supply support for SN74LVTT244PWLE 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 SN74LVTT244PWLE belongs to TI's ABT logic family, engineered specifically for seamless interoperability between emerging 3.3-V digital systems and legacy 5-V TTL infrastructure.
FAQ
What is the maximum input voltage the SN74LVTT244PWLE can tolerate?
The SN74LVTT244PWLE supports input voltages from –0.5 V to 7 V, enabling direct connection to 5-V TTL buses without external protection. This 5-V tolerance is maintained across the full operating temperature range (–40°C to 85°C) and supply range (2.7 V to 3.6 V), making the SN74LVTT244PWLE ideal for mixed-voltage system integration where level-shifting circuits would otherwise be required.
Does the SN74LVTT244PWLE support live insertion in powered backplanes?
Yes, the SN74LVTT244PWLE supports live insertion due to its controlled 3-state enable behavior, low ground bounce (<0.8 V), and latch-up immunity exceeding 500 mA per JEDEC JESD-17. When OE is held high during insertion, outputs remain in high-impedance state until VCC stabilizes - preventing bus contention. This makes the SN74LVTT244PWLE suitable for modular instrumentation and telecom shelf applications requiring hot-swap capability.
What is the recommended pull-up resistor value for OE pins on the SN74LVTT244PWLE?
The minimum OE pull-up resistor value for the SN74LVTT244PWLE is determined by the current-sinking capability of the driving source. TI recommends using a resistor that ensures OE remains reliably high during power-up; typical values range from 4.7 kΩ to 10 kΩ when driven by standard CMOS logic. The SN74LVTT244PWLE datasheet specifies that OE must be tied to VCC through a pull-up to guarantee high-impedance state at power-on, avoiding unintended output activation.
Can the SN74LVTT244PWLE operate from a 2.7-V supply while driving 5-V loads?
Yes, the SN74LVTT244PWLE is fully characterized from 2.7 V to 3.6 V and maintains 5-V input/output tolerance across this entire range. At VCC = 2.7 V, it still delivers VOH ≥ 2.4 V (with IOL = 24 mA) and accepts VI up to 5.5 V. This allows the SN74LVTT244PWLE to sustain reliable communication with 5-V peripherals even as battery voltage declines - a key advantage in portable and remote sensing applications.
What package type does the SN74LVTT244PWLE use, and what are its key mechanical features?
The SN74LVTT244PWLE uses a 20-pin Thin Shrink Small-Outline (PW) package with 0.65 mm lead pitch, 7.2 mm × 4.4 mm body size, and gull-wing leads. Its compact footprint occupies less than half the PCB area of standard SOIC packages while maintaining identical pinout compatibility with other PW-packaged TI logic devices. The PW package also includes an exposed thermal pad for enhanced heat dissipation in high-density layouts.
SN74LVTT244PWLE 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:
- -
SN74LVTT244PWLE FAQ
1.How can I place an order for SN74LVTT244PWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTT244PWLE 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 SN74LVTT244PWLE reliable?
The price and inventory of SN74LVTT244PWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTT244PWLE is usually 5 days.
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Once your SN74LVTT244PWLE 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 SN74LVTT244PWLE?
For technical support, including SN74LVTT244PWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTT244PWLE requirements.
6.How does Aetrix verify that SN74LVTT244PWLE is sourced from the original manufacturer or authorized distributors?
All SN74LVTT244PWLE 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 SN74LVTT244PWLE meets industry standards.
7.What is the process for return or replacement of SN74LVTT244PWLE?
All SN74LVTT244PWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTT244PWLE, 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 SN74LVTT244PWLE part is unused and in its original packaging.
Return procedure for SN74LVTT244PWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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