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Texas Instruments SNJ54LVT244FK
- Part No.:
- SNJ54LVT244FK
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54LVT244FK.pdf
- Description:
- BUS DRIVER, LVT SERIES, 4-BIT
- Quantity:
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Inventory:239
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Product details
Overview
SNJ54LVT244FK from Texas Instruments is a military-grade 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode 5-V/3.3-V interfacing in high-reliability systems. It features two independent 4-bit channels, bus-hold inputs eliminating external pullups, and operates across –55°C to 125°C with VCC down to 2.7 V. Used in avionics data buses and ruggedized backplane interfaces.
For engineers reviewing the SNJ54LVT244FK datasheet, SNJ54LVT244FK pinout, SNJ54LVT244FK application, or SNJ54LVT244FK equivalent, key selection criteria include its military temperature rating, LCCC FK package compatibility, 3-state output control timing (tPZL ≤ 7.6 ns at 2.7 V), and bus-hold input functionality for floating-input robustness.
Technical Context
The SNJ54LVT244FK implements Advanced BiCMOS Technology (ABT) for low static power and TTL-compatible 5-V input tolerance while powered from 3.3-V VCC. Its dual 4-bit architecture uses separate OE1 and OE2 controls, enabling independent channel gating without propagation delay interaction.
Bus-hold circuitry actively maintains valid logic levels on unused A inputs, reducing system-level component count. Output ground bounce (VOLP) is specified < 0.8 V at VCC = 3.3 V, critical for signal integrity in dense military PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and accommodates supply droop in field-deployed systems |
| Operating Temperature | –55°C to 125°C - qualified per MIL-STD-883 for aerospace and defense platforms |
| IOL / IOH | 48 mA / –24 mA - drives standard TTL loads directly without external buffers |
| tPLH / tPHL | 0.5 ns to 4.7 ns - ensures sub-5-ns propagation for high-speed address/data latching |
| Input Voltage Tolerance | –0.5 V to 7 V - accepts 5-V logic inputs safely while powered from 3.3-V rail |
| Bus-Hold Current | ±75 µA at VI = 0.8 V or 2 V - maintains stable logic state on unterminated traces |
| ESD Protection | >2000 V HBM - exceeds MIL-STD-883C Method 3015 for handling in non-EPA environments |
Pinout & Package
Ceramic Leadless Chip Carrier (LCCC) package, FK outline, 20-terminal square body with J-lead configuration, hermetically sealed for high-reliability mil-aero applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Output Enable 1 | Active-low enable for first 4-bit channel (1Y1–1Y4); ties to VCC via pullup for power-up high-Z safety |
| 1A1–1A4 | Data Inputs 1 | True logic inputs for first channel; each includes bus-hold circuitry to prevent floating states |
| 1Y1–1Y4 | 3-State Outputs 1 | Non-inverting buffered outputs; high-impedance when 1OE = high |
| 2OE | Output Enable 2 | Independent active-low enable for second 4-bit channel (2Y1–2Y4) |
| 2A1–2A4 | Data Inputs 2 | True logic inputs for second channel; identical bus-hold behavior as 1Ax pins |
| 2Y1–2Y4 | 3-State Outputs 2 | Non-inverting buffered outputs; isolated timing from first channel |
| GND | Ground | Power return reference; pin 10 - central thermal pad location for ceramic package heat dissipation |
| VCC | Supply Voltage | 3.3-V core supply; pin 11 - decoupling capacitor placement critical due to fast edge rates |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O | 5-V tolerant inputs and outputs while operating from 3.3-V VCC - enables seamless interface between legacy 5-V logic and modern low-voltage subsystems |
| Bus-Hold Inputs | Eliminates need for external pullup/pulldown resistors on A inputs - reduces BOM count and PCB area in space-constrained mil-spec designs |
| Live Insertion Support | Controlled output turn-on/off sequencing prevents bus contention during hot-swap operations in modular avionics racks |
| Low Ground Bounce | VOLP < 0.8 V at VCC = 3.3 V - minimizes noise coupling into adjacent analog or RF sections on shared ground planes |
| Military Qualification | Characterized per SN54LVT244 spec, meeting JEDEC JESD-17 latch-up immunity (>500 mA) and MIL-STD-883 environmental testing |
Applications
| Avionics Data Bus Interface | Tactical Radios Baseband Processing |
|---|---|
Use Scenario: Interfacing 5-V FPGA I/O banks to 3.3-V microcontroller peripherals in airborne mission computers. IC Role / Device Role / Timing Role: Level-shifting octal buffer providing bidirectional data path isolation with precise 3-state control timing. Use Value: Enables direct connection without discrete level translators, reducing latency and board area while maintaining MIL-STD-704 voltage transient resilience. |
Use Scenario: Driving multiple 5-V analog-to-digital converter (ADC) control lines from a 3.3-V DSP in manpack radios. IC Role / Device Role / Timing Role: Output driver with bus-hold protection for ADC chip-select and conversion-start signals subject to EMI in RF-dense environments. Use Value: Prevents spurious conversions caused by floating control lines during RF burst transmission, improving bit-error rate stability. |
| Ruggedized Industrial PLC Backplane | Space-Qualified Payload Controller |
Use Scenario: Buffering sensor data lanes between 5-V industrial sensors and 3.3-V ARM-based controller modules in oilfield drilling equipment. IC Role / Device Role / Timing Role: High-noise-margin octal driver ensuring reliable data capture under 100+ V/m conducted EMI conditions. Use Value: Delivers 48 mA sink current per output to drive long traces through noisy motor-drive zones without signal degradation. |
Use Scenario: Isolating command/address lines between radiation-hardened FPGA and memory subsystem in satellite payload controllers. IC Role / Device Role / Timing Role: Radiation-tolerant 3-state buffer supporting fault-containment via independent OE gating of memory access paths. Use Value: LCCC FK package provides hermetic sealing and CTE-matched mounting for thermal cycling survival across ±100°C orbital environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LVTH244FK | Includes TTL-compatible output drivers with higher drive strength (IOL = 64 mA) and improved noise margin; requires same VCC range but lacks bus-hold inputs | Suitable for high-fanout digital backplanes where external pullups are acceptable and faster edge rates are needed | Select when higher output current and tighter AC specs are prioritized over bus-hold convenience |
| SNJ54ACT244J | 5-V-only CMOS device with 3-state outputs; no 3.3-V operation or 5-V input tolerance; different DC thresholds (VIH = 3.5 V) | Applicable only in legacy all-5-V systems; incompatible with mixed-voltage domains or low-VCC battery operation | Choose only for drop-in replacement in existing 5-V designs with no voltage translation requirements |
Compared with SNJ54LVT244FK, SNJ54LVTH244FK offers superior drive capability but removes bus-hold protection, increasing external component dependency; SNJ54ACT244J is voltage-incompatible and cannot substitute in 3.3-V or mixed-mode systems without redesign.
Availability
SNJ54LVT244FK is available at Aetrix Electronics and suitable for avionics data bus interfaces, tactical radio baseband processing, and ruggedized industrial PLC backplanes requiring stable component supply across extended temperature ranges and long lifecycle commitments.
Supply support for SNJ54LVT244FK 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 deep heritage in military-qualified components since the 1960s.
The SN54LVT244 family was developed to bridge legacy 5-V logic systems with emerging 3.3-V architectures in defense electronics, emphasizing mixed-voltage interoperability and rugged packaging.
FAQ
What is the maximum operating temperature range for SNJ54LVT244FK?
The SNJ54LVT244FK is characterized for operation from –55°C to 125°C, meeting full military temperature specifications per MIL-STD-883. This range is validated through temperature cycling, burn-in, and parametric testing across the extremes, making SNJ54LVT244FK suitable for deployment in jet engine bays, satellite payloads, and desert-deployed electronic warfare systems where ambient thermal stress exceeds commercial limits.
Does SNJ54LVT244FK support live insertion in hot-swap backplanes?
Yes, SNJ54LVT244FK supports live insertion per its design documentation, achieved through controlled output-enable sequencing and robust ESD protection (>2000 V HBM). The device's 3-state outputs enter high-impedance before VCC reaches operational threshold when OE is tied appropriately, preventing bus contention during card insertion - a requirement verified in TI's application notes for modular avionics chassis using SNJ54LVT244FK.
Can SNJ54LVT244FK accept 5-V inputs while powered from a 3.3-V supply?
Yes, SNJ54LVT244FK explicitly supports 5-V input tolerance with VCC = 3.3 V, as confirmed in its absolute maximum ratings (VI up to 7 V) and recommended operating conditions (VI up to 5.5 V). This mixed-mode capability allows SNJ54LVT244FK to interface directly with legacy 5-V microcontrollers or FPGAs without level-shifting circuitry, simplifying system integration in upgrade paths.
What package type does SNJ54LVT244FK use, and why is it suited for military applications?
SNJ54LVT244FK uses a 20-terminal Ceramic Leadless Chip Carrier (LCCC) in FK outline - a hermetically sealed, leadless package with low thermal resistance and excellent moisture resistance. Its coefficient of thermal expansion closely matches alumina substrates, minimizing solder joint fatigue during thermal cycling, which is why SNJ54LVT244FK is specified for missile guidance systems and airborne radar where mechanical reliability under shock/vibration is mandatory.
How does the bus-hold feature in SNJ54LVT244FK reduce system design complexity?
The bus-hold circuitry in SNJ54LVT244FK actively maintains valid logic states on unused or unterminated A inputs, drawing ±75 µA to hold VI near 0.8 V (low) or 2 V (high). This eliminates the need for external pullup/pulldown resistors on every data line - reducing BOM cost, PCB real estate, and potential failure points in compact military modules where SNJ54LVT244FK is commonly deployed.
SNJ54LVT244FK 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:
- -
SNJ54LVT244FK FAQ
1.How can I place an order for SNJ54LVT244FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LVT244FK 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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5.How can I obtain technical support or documentation for SNJ54LVT244FK?
For technical support, including SNJ54LVT244FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LVT244FK requirements.
6.How does Aetrix verify that SNJ54LVT244FK is sourced from the original manufacturer or authorized distributors?
All SNJ54LVT244FK 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 SNJ54LVT244FK meets industry standards.
7.What is the process for return or replacement of SNJ54LVT244FK?
All SNJ54LVT244FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LVT244FK, 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 SNJ54LVT244FK part is unused and in its original packaging.
Return procedure for SNJ54LVT244FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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