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Texas Instruments SN74LVTT244DW
- Part No.:
- SN74LVTT244DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVTT244DW.pdf
- Description:
- BUS DRIVER, LVT SERIES, 4-BIT
- Quantity:
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Inventory:5,925
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Product details
Overview
SN74LVTT244DW from Texas Instruments is a 3.3-V Advanced BiCMOS octal buffer/driver with dual 4-bit channels, 3-state outputs, ±64 mA output drive at VCC = 3.3 V, and mixed-mode 5-V input tolerance. It enables level translation between 3.3-V logic domains and legacy 5-V systems in bus interface applications.
For engineers reviewing the SN74LVTT244DW datasheet, SN74LVTT244DW pinout, SN74LVTT244DW application, or SN74LVTT244DW equivalent, key selection criteria include 3-state enable timing (tPZL ≤ 6.7 ns), low ground bounce (VOLP < 0.8 V), latch-up immunity (>500 mA), and support for live insertion in hot-swap backplane designs.
Technical Context
The SN74LVTT244DW implements two independent 4-bit noninverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Its ABT BiCMOS architecture delivers TTL-compatible output swing while operating from a 2.7–3.6 V supply.
It supports true mixed-signal operation: inputs tolerate up to 5.5 V regardless of VCC, enabling direct connection to 5-V buses without external level shifters; outputs drive 5-V loads when VCC ≥ 2.7 V and maintain valid VOH/VOL levels per TTL thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery rails and low-noise 3.3-V system supplies |
| IOL / IOH | 64 mA / –32 mA at VCC = 3.3 V - drives standard TTL loads with margin for parallel fanout |
| tPLH / tPHL | 2.5 ns typical - ensures sub-5 ns propagation delay for high-speed address/data buffering |
| VIL / VIH | 0.8 V / 2.0 V - compatible with both 3.3-V LVTTL and 5-V TTL input thresholds |
| VOL / VOH | 0.55 V / 2.0 V at IOL = 64 mA / IOH = –32 mA - meets TTL output voltage requirements at full drive |
| ICC (active) | 12 mA max at VCC = 3.6 V - low static power vs. legacy 5-V TTL buffers |
| IOZH / IOZL | 5 µA / –5 µA - minimal leakage in 3-state mode preserves bus integrity during idle periods |
Pinout & Package
SN74LVTT244DW uses a 20-pin plastic small-outline (SOIC) package (DW suffix), 7.5 mm × 12.8 mm body, 0.65 mm lead pitch, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel A (pins 1A1–1A4 → 1Y1–1Y4) and Channel B (2A1–2A4 → 2Y1–2Y4) |
| 2, 4, 6, 8 | 1A1–1A4 | Input pins for first 4-bit buffer channel; accept 0–5.5 V signals independent of VCC |
| 18, 16, 14, 12 | 1Y1–1Y4 | Noninverting 3-state outputs for Channel A; high-impedance when OE = HIGH |
| 11, 13, 15, 17 | 2A1–2A4 | Input pins for second 4-bit buffer channel; electrically identical to 1Ax group |
| 9, 7, 5, 3 | 2Y1–2Y4 | Noninverting 3-state outputs for Channel B; driven only when 2OE = LOW |
| 10 | GND | Power ground reference for all I/O and internal circuitry |
| 20 | VCC | 3.3-V supply input; supports down to 2.7 V for brownout tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs with 3.3-V VCC eliminates external level translators in 3.3/5-V hybrid systems |
| Live insertion support | Controlled output turn-on/off timing and robust ESD/latch-up protection (≥500 mA) enable safe hot-plug into powered backplanes |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures signal integrity during simultaneous switching of multiple outputs |
| Wide VCC operating range | 2.7–3.6 V operation accommodates aging batteries and noisy DC-DC converter outputs without reset or glitch |
| High noise immunity | VIH = 2.0 V and VIL = 0.8 V provide >1.2 V noise margin against TTL-level interference on shared buses |
Applications
| PCI Bus Interface | Hot-Swap Backplane |
|---|---|
|
Use Scenario: Isolating 3.3-V control logic from 5-V PCI slot signaling while maintaining timing compliance. IC Role / Device Role / Timing Role: Bidirectional level-shifting buffer for AD[31:0], C/BE#[3:0], and PAR lines with precise 3-state control. Use Value: Eliminates discrete resistor networks and reduces PCB area by integrating eight matched drivers with guaranteed tPZL ≤ 6.7 ns. |
Use Scenario: Enabling safe insertion/removal of line cards into live telecom or server backplanes. IC Role / Device Role / Timing Role: Output-enable-gated driver for card-present detection, reset distribution, and status bus isolation. Use Value: Prevents bus contention via controlled output disable (tPHZ ≤ 6.9 ns) and withstands >500 mA latch-up per JEDEC JESD-17. |
| Legacy System Upgrade | Industrial I/O Module |
|
Use Scenario: Retrofitting 5-V microcontroller peripherals (e.g., LCD controllers, UARTs) into modern 3.3-V host systems. IC Role / Device Role / Timing Role: Unidirectional voltage translator for data/address latching with TTL-compatible VOH/VOL. Use Value: Maintains full 5-V drive capability (64 mA sink) while consuming <12 mA ICC - cuts power vs. dual-supply solutions. |
Use Scenario: Buffering PLC digital I/O signals across isolated power domains in factory automation. IC Role / Device Role / Timing Role: High-immunity bus driver for 24-V optocoupler inputs and relay coil drivers. Use Value: 5-V-tolerant inputs interface directly to industrial sensors; 3-state outputs prevent backfeeding during module replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower drive (24 mA), no 5-V input tolerance, 1.65–3.6 V VCC range | Suitable only for pure 3.3-V systems; cannot replace SN74LVTT244DW in mixed-voltage buses | Select when cost and power are prioritized over 5-V compatibility and higher drive strength |
| 74ALVC244MTCX | Higher speed (tPD = 2.3 ns), 1.65–3.6 V VCC, 5-V tolerant inputs only up to 3.6 V | Limited to 3.3-V environments with strict timing; lacks SN74LVTT244DW's 2.7-V brownout support | Choose for sub-3 ns propagation in compact 3.3-V designs where 5-V bus interfacing is unnecessary |
Compared with SN74LVC244APWR and 74ALVC244MTCX, the SN74LVTT244DW uniquely combines 5-V input tolerance, 64 mA drive, and 2.7–3.6 V operation - making it irreplaceable in legacy-to-modern voltage bridging where reliability under brownout and hot-swap conditions is critical.
Availability
SN74LVTT244DW is available at Aetrix Electronics and suitable for PCI bus interface, hot-swap backplane, and legacy system upgrade applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74LVTT244DW 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 logic solutions with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74LVTT244DW belongs to TI's ABT (Advanced BiCMOS Technology) logic family, engineered for reliable 3.3-V operation with backward compatibility to 5-V TTL systems in mission-critical infrastructure.
FAQ
What is the minimum VCC required for reliable operation of the SN74LVTT244DW?
The SN74LVTT244DW operates reliably down to 2.7 V per its recommended operating conditions. At this voltage, it maintains valid VOH ≥ 2.4 V and VOL ≤ 0.5 V under specified load, supporting unregulated battery-powered systems. Below 2.7 V, timing and output drive degrade beyond specification limits - always verify behavior in final design using the SCES006 datasheet's electrical characteristics tables.
Can the SN74LVTT244DW safely interface with 5-V microcontrollers without external level shifters?
Yes - the SN74LVTT244DW accepts 5-V inputs (up to 5.5 V) while powered from 3.3 V, eliminating external level shifters. Its inputs meet TTL thresholds (VIH = 2.0 V, VIL = 0.8 V), and outputs deliver TTL-compliant VOH/VOL when driving 5-V loads. This makes SN74LVTT244DW ideal for bridging 3.3-V FPGAs or processors to legacy 5-V peripherals.
How does the SN74LVTT244DW handle ground bounce during high-speed switching?
The SN74LVTT244DW specifies typical output ground bounce (VOLP) < 0.8 V at VCC = 3.3 V and TA = 25°C, achieved through ABT BiCMOS output stage optimization. This low VOLP prevents false logic transitions on shared ground planes during simultaneous switching of multiple outputs - a critical requirement for SN74LVTT244DW use in dense bus interfaces like PCI or memory expansion slots.
Is the SN74LVTT244DW suitable for hot-swap applications?
Yes - the SN74LVTT244DW supports live insertion per its design features: controlled 3-state timing (tPZL ≤ 6.7 ns, tPHZ ≤ 6.9 ns), latch-up immunity exceeding 500 mA per JEDEC JESD-17, and robust ESD protection. These ensure bus isolation and fault resilience during card insertion/removal in powered backplanes - a core use case validated in TI's ABT technology documentation for SN74LVTT244DW.
What is the thermal power dissipation limit for the SN74LVTT244DW in the DW package?
The SN74LVTT244DW in the DW (SOIC-20) package has a maximum power dissipation of 1.6 W at TA = 55°C in still air, calculated using a 150°C junction temperature and 750-mil board traces. Actual thermal performance depends on PCB copper area and airflow; for continuous 64 mA output loading, derate ambient temperature per the SCES006 thermal curves to avoid exceeding TJ(max) = 150°C.
SN74LVTT244DW 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:
- -
SN74LVTT244DW FAQ
1.How can I place an order for SN74LVTT244DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTT244DW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74LVTT244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTT244DW is usually 5 days.
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Once your SN74LVTT244DW 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 SN74LVTT244DW?
For technical support, including SN74LVTT244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTT244DW requirements.
6.How does Aetrix verify that SN74LVTT244DW is sourced from the original manufacturer or authorized distributors?
All SN74LVTT244DW 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 SN74LVTT244DW meets industry standards.
7.What is the process for return or replacement of SN74LVTT244DW?
All SN74LVTT244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTT244DW, 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 SN74LVTT244DW part is unused and in its original packaging.
Return procedure for SN74LVTT244DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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