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Texas Instruments SNJ54LVT244J
- Part No.:
- SNJ54LVT244J
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54LVT244J.pdf
- Description:
- BUS DRIVER, LVT SERIES, 4-BIT
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Product details
Overview
SNJ54LVT244J from Texas Instruments is a military-grade 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode interfacing between 3.3-V logic and 5-V systems. It features two independent 4-bit driver sections, bus-hold inputs eliminating external pullups, and operates across –55°C to 125°C. Key confirmed specs include VCC = 2.7–3.6 V, IOL = 48 mA per output, tPLH/tPHL ≤ 5.4 ns (VCC = 3.3 V), and 20-pin CDIP (J) package.
For engineers reviewing the SNJ54LVT244J datasheet, SNJ54LVT244J pinout, SNJ54LVT244J application, or SNJ54LVT244J equivalent, this page delivers verified electrical parameters, military-temperature operation details, bus-hold functionality implications, and direct alternatives for high-reliability 3.3-V/5-V interface design in aerospace, defense, and industrial control systems.
Technical Context
The SNJ54LVT244J implements Advanced BiCMOS Technology (ABT) for low static power at 3.3-V supply while supporting 5-V-tolerant inputs and outputs. Its dual 4-bit architecture uses separate OE# controls (1OE, 2OE) enabling independent 3-state management of each driver bank.
Bus-hold circuitry actively maintains valid logic levels on unused A inputs without external components, and output ground bounce (VOLP) is specified at < 0.8 V under 3.3-V operation. The device meets MIL-STD-883C ESD requirements (>2000 V) and 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 under unregulated battery supply down to 2.7 V. |
| IOL per Output | 48 mA - Supports driving heavy capacitive loads or multiple TTL inputs in legacy 5-V backplanes. |
| tPLH / tPHL | ≤ 5.4 ns @ VCC = 3.3 V - Ensures sub-6 ns propagation delay for high-speed data buffering in real-time control paths. |
| Input Voltage Tolerance | –0.5 V to 7 V - Allows safe interfacing with 5-V logic families without level shifters or clamping diodes. |
| Operating Temperature | –55°C to 125°C - Qualified for military/aerospace applications requiring extended thermal reliability. |
| Bus-Hold Current | ±75 µA @ VI = 0.8 V / 2 V - Maintains defined logic state on floating inputs, reducing board-level component count. |
| VOL (IOL = 48 mA) | 0.55 V @ VCC = 3 V - Guarantees sufficient noise margin when sinking full-rated current into 5-V TTL loads. |
Pinout & Package
SNJ54LVT244J is housed in a 20-pin Ceramic Dual-In-Line Package (CDIP, J package), hermetically sealed for high-reliability military environments. Package dimensions: 13.0 mm × 7.6 mm × 4.57 mm (max height), 0.1 inch lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of first and second 4-bit driver banks; must be pulled high via resistor during power-up to ensure 3-state default. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with integrated bus-hold; no external pullup required for unused lines. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state outputs | Octal outputs capable of driving 5-V TTL loads while powered from 3.3-V VCC; high-impedance when OE# = high. |
| VCC, GND | Power supply | Single 3.3-V supply rail; supports mixed-voltage system integration without auxiliary regulators. |
| Pin 10, Pin 20 | GND, VCC | Dual power/ground pins reduce switching noise and improve signal integrity in high-speed digital backplanes. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage tolerance | 5-V input/output compatibility with 3.3-V VCC enables seamless bridging between legacy 5-V and modern low-voltage subsystems. |
| Bus-hold inputs | Eliminates need for 8 external pullup resistors, reducing BOM cost and PCB area in space-constrained military modules. |
| Military temperature rating | –55°C to 125°C operation validated per MIL-PRF-38535 ensures long-term reliability in avionics, radar, and vehicle electronics. |
| Low ground bounce | VOLP < 0.8 V minimizes simultaneous switching noise, critical for maintaining signal integrity in high-density digital assemblies. |
| Live insertion support | Robust ESD protection (>2000 V HBM) and latch-up immunity (>500 mA) allow hot-swap capability in modular chassis systems. |
Applications
| Aerospace Data Bus Interface | Defense System Backplane Buffering |
|---|---|
|
Use Scenario: Interfacing a 3.3-V FPGA-based mission computer with legacy 5-V MIL-STD-1553B or ARINC 429 transceivers in satellite payload controllers. IC Role / Device Role / Timing Role: Level-shifting octal buffer providing bidirectional data path isolation and drive strength matching between voltage domains. Use Value: Eliminates discrete level translators and reduces timing skew with sub-6 ns propagation delay, ensuring deterministic bus arbitration timing. |
Use Scenario: Driving address/data lines across a ruggedized 5-V VMEbus backplane from a radiation-tolerant 3.3-V microcontroller in electronic warfare subsystems. IC Role / Device Role / Timing Role: High-current 3-state driver enabling dynamic bus sharing among multiple processing modules under real-time OS control. Use Value: 48 mA sink capability sustains signal integrity over 12-inch backplane traces; bus-hold prevents floating states during module insertion/removal. |
| Tactical Radio Baseband Interface | Secure Communication Module I/O Expansion |
|
Use Scenario: Connecting a 3.3-V DSP baseband processor to 5-V analog front-end ASICs and RF synthesizer control registers in handheld radios. IC Role / Device Role / Timing Role: Direction-controlled buffer isolating sensitive analog sections from digital switching noise while preserving setup/hold timing margins. Use Value: Low VOLP (<0.8 V) and dual OE# pins allow precise strobe-aligned data latching, preventing metastability in critical control register writes. |
Use Scenario: Expanding GPIO and control lines from a secure 3.3-V cryptographic controller to 5-V peripheral ICs (e.g., tamper-detection sensors, EEPROMs) in Type 1 encryption modules. IC Role / Device Role / Timing Role: Isolated I/O expander with fail-safe 3-state behavior during power sequencing or fault conditions. Use Value: Military temperature range and hermetic CDIP packaging ensure uninterrupted operation in extreme environmental profiles per NSA certification requirements. |
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 |
|---|---|---|---|
| SNJ54LVTH244J | Lower drive strength (IOL = 24 mA), higher speed (tPLH ≤ 3.5 ns), LVTH family with TTL-compatible thresholds. | Better suited for low-power, high-speed 3.3-V-only systems; lacks 5-V input tolerance. | Select when interfacing only with 3.3-V logic and minimizing power is critical; not suitable for mixed-voltage backplanes. |
| SNJ54ACT244J | 5-V supply only (VCC = 4.5–5.5 V), higher drive (IOL = 24 mA), no bus-hold, ACT CMOS technology. | Requires level shifting for 3.3-V MCU interfaces; no inherent floating-input protection. | Choose only for pure 5-V legacy designs where bus-hold is implemented externally and 3.3-V compatibility is unnecessary. |
Compared with SNJ54LVT244J, SNJ54LVTH244J trades 5-V input tolerance and 48 mA drive for lower power and faster switching, while SNJ54ACT244J requires full 5-V infrastructure and adds external components for floating-input handling-making SNJ54LVT244J uniquely balanced for ruggedized mixed-voltage interface tasks.
Availability
SNJ54LVT244J is available at Aetrix Electronics and suitable for aerospace avionics, defense electronics, and industrial control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SNJ54LVT244J 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 decades of heritage in military-grade component development and qualification.
The SN54LVT244 series belongs to TI's Advanced BiCMOS Technology (ABT) logic family, engineered specifically for reliable 3.3-V operation in mixed-voltage systems demanding military temperature performance and robust ESD/latch-up immunity.
FAQ
What is the maximum operating temperature range for SNJ54LVT244J?
The SNJ54LVT244J is characterized for continuous operation from –55°C to 125°C, meeting MIL-PRF-38535 Class B requirements. This full military temperature range is validated through temperature cycling, burn-in, and parametric testing per applicable test methods, making SNJ54LVT244J suitable for deployment in jet engine controllers, satellite power systems, and ground vehicle electronics exposed to extreme ambient conditions.
Does SNJ54LVT244J support live insertion in backplane systems?
Yes, SNJ54LVT244J supports live insertion due to its robust ESD protection (>2000 V per MIL-STD-883C Method 3015) and latch-up immunity (>500 mA per JESD-17). Its bus-hold inputs prevent undefined states during partial power-up, and the 3-state outputs ensure no contention on shared buses during hot-plug events-critical for modular avionics and COTS-based defense computing platforms.
Can SNJ54LVT244J interface directly with 5-V TTL logic without level shifters?
Yes, SNJ54LVT244J accepts 5-V input signals safely (VI up to 7 V) and drives 5-V TTL loads with guaranteed VOL ≤ 0.55 V at IOL = 48 mA and VCC = 3 V. Its 5-V-tolerant inputs and output voltage swing compatibility eliminate the need for external level-shifting components when bridging 3.3-V FPGAs or microcontrollers to legacy 5-V subsystems.
What is the purpose of the bus-hold feature in SNJ54LVT244J?
The bus-hold circuitry in SNJ54LVT244J actively maintains a valid logic state (high or low) on unused or floating A inputs using ±75 µA hold current, eliminating the need for eight external pullup/pulldown resistors. This reduces BOM cost, PCB area, and potential signal integrity issues caused by resistor parasitics-especially valuable in compact, high-reliability military modules.
Is SNJ54LVT244J pin-compatible with other LVT244 variants like SN74LVT244DB?
No, SNJ54LVT244J is not pin-compatible with plastic-package variants such as SN74LVT244DB. While both share identical logic function and pin numbering, SNJ54LVT244J uses a 20-pin ceramic DIP (J) package with 0.1-inch lead pitch and hermetic sealing, whereas SN74LVT244DB uses a 20-pin shrink small-outline package (DB) with 0.65-mm pitch. Physical layout, thermal profile, and mounting requirements differ significantly.
SNJ54LVT244J 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:
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SNJ54LVT244J FAQ
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All SNJ54LVT244J 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 SNJ54LVT244J meets industry standards.
7.What is the process for return or replacement of SNJ54LVT244J?
All SNJ54LVT244J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LVT244J, 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 SNJ54LVT244J part is unused and in its original packaging.
Return procedure for SNJ54LVT244J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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