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Texas Instruments SNJ54BCT2244J
- Part No.:
- SNJ54BCT2244J
- Manufacturer:
- Texas Instruments
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- Datasheet:
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SNJ54BCT2244J.pdf
- Description:
- 54BCT2244 OCTAL BUFFERS AND LINE
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Product details
Overview
SNJ54BCT2244J from Texas Instruments is a military-grade octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus driving in high-reliability systems. It operates from 4.5 V to 5.5 V, features BiCMOS architecture, integrates 33-Ω series output resistors, delivers ±12 mA drive strength, and supports −55°C to +125°C operation.
For engineers reviewing the SNJ54BCT2244J datasheet, SNJ54BCT2244J pinout, SNJ54BCT2244J application, or SNJ54BCT2244J equivalent, key selection criteria include its 3-state bus-driving capability, integrated series termination, wide temperature range, low ICCZ quiescent current, and compatibility with TTL-level control signals in legacy aerospace and defense subsystems.
Technical Context
The SNJ54BCT2244J implements two independent 4-bit noninverting buffer sections (1A1–1A4 → 1Y1–1Y4 and 2A1–2A4 → 2Y1–2Y4), each controlled by a dedicated active-low output-enable input (1OE, 2OE). Its BiCMOS design combines bipolar input stages for TTL compatibility and CMOS output stages for low power and high speed.
Each output includes an internal 33-Ω series resistor to dampen transmission-line reflections without external components. The device meets MIL-PRF-38535 Class B requirements, with all parameters tested across the full −55°C to +125°C range and qualified for use in radiation-tolerant, high-stability military platforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation in regulated 5-V military power rails with ±10% tolerance. |
| Output Drive | ±12 mA - Sufficient to directly drive terminated 50-Ω transmission lines or standard TTL loads without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 6.7 ns @ 5 V - Enables reliable timing in high-speed address/data bus applications up to ~150 MHz. |
| 3-State Enable Time | tPZH/tPZL ≤ 9.4 ns - Supports fast bus arbitration and multiplexing in real-time control systems. |
| Input Compatibility | TTL-level VIH = 2 V, VIL = 0.8 V - Directly interfaces with legacy TTL logic families without level-shifting. |
| Quiescent Current | ICCZ ≤ 10 mA - Minimizes standby power in always-on avionics modules where thermal management is critical. |
| Operating Temperature | −55°C to +125°C - Qualified for deployment in engine-mounted controllers, radar front-ends, and space-qualified electronics. |
Pinout & Package
SNJ54BCT2244J is housed in a 20-pin Ceramic Dual-In-Line Package (CDIP-J) with hermetic sealing and tin-lead (SNPB) lead finish, rated for military temperature and reliability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit buffer section; must be pulled high via resistor during power-up to ensure defined high-impedance state. |
| 1A1–1A4, 2A1–2A4 | Noninverting data inputs | Eight TTL-compatible inputs accepting 0.8 V / 2 V thresholds; no internal pull-ups or pull-downs. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Eight outputs each with integrated 33-Ω series resistor; capable of sourcing/sinking ±12 mA into bus loads. |
| VCC (Pin 10) | Positive supply | 5-V nominal supply connection; decoupling capacitor required adjacent to pin for noise suppression. |
| GND (Pin 20) | Ground reference | Common return path for all I/O and supply currents; requires low-inductance PCB routing to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 33-Ω series output resistors | Eliminates need for eight external termination resistors on PCB, reducing component count and layout area in space-constrained modules. |
| BiCMOS process technology | Combines TTL input compatibility with CMOS output efficiency, achieving 3× lower ICCZ than equivalent bipolar-only drivers. |
| Full military temperature qualification | All electrical parameters tested across −55°C to +125°C per MIL-PRF-38535, enabling use in uncooled airborne and missile guidance systems. |
| High fan-out capability | Each output drives ≥20 LSTTL loads, supporting direct interfacing to multiple downstream registers or latches without buffering. |
| Low overshoot/undershoot performance | On-chip 33-Ω resistors suppress signal ringing on long PCB traces, maintaining signal integrity in backplane and chassis-level interconnects. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address bus between microprocessor and SRAM/ROM in a flight control computer. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory module inputs; enables time-multiplexed bus sharing with DMA controllers. Use Value: Integrated 33-Ω resistors prevent address line ringing at 20-MHz clock rates, eliminating timing violations caused by trace reflections. | Use Scenario: Bidirectional data bus isolation between FPGA and legacy ASIC in a radar signal processor. IC Role / Device Role / Timing Role: Octal line driver providing direction-controlled, high-drive-strength interface between mismatched logic families on shared data lines. Use Value: ±12 mA drive strength ensures clean logic transitions across 10-cm backplane traces, while 3-state control supports half-duplex communication protocols. |
| Clock Distribution Network | Avionics Sensor Interface |
Use Scenario: Distributing synchronized clock signals to multiple ADCs and DACs in a phased-array antenna controller. IC Role / Device Role / Timing Role: Low-skew, noninverting buffer replicating master clock to eight remote analog subsystems with matched trace lengths. Use Value: Propagation delay matching (≤0.5 ns variation between channels) maintains sub-nanosecond phase alignment critical for coherent beamforming. | Use Scenario: Interfacing discrete temperature and pressure sensors to a ruggedized data acquisition unit in jet engine monitoring. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface converting sensor digital outputs to robust 5-V TTL-compatible signals for long-harness transmission. Use Value: −55°C to +125°C operation and hermetic CDIP package ensure uninterrupted functionality under extreme thermal cycling and vibration conditions. |
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 |
|---|---|---|---|
| SNJ54ACT244J | CMOS-based, higher VIH/VIL thresholds (3.5 V / 1.5 V), lower ICCZ (≤2 mA), but no integrated series resistors. | Requires external 33-Ω resistors for bus termination; better suited for low-power, low-noise environments where drive strength is secondary. | Select when system-level EMI reduction and ultra-low standby current outweigh the benefit of integrated termination. |
| SNJ54LS244J | Bipolar TTL-only, higher ICCZ (≥40 mA), no internal series resistors, slower propagation (≤25 ns), limited to +125°C max. | Needs external termination and heatsinking; suitable only for legacy designs where BiCMOS upgrade is not feasible. | Choose only for backward compatibility in field-replacement scenarios where SNJ54BCT2244J is unavailable. |
Compared with SNJ54ACT244J and SNJ54LS244J, the SNJ54BCT2244J uniquely balances military-grade temperature range, integrated 33-Ω termination, and BiCMOS efficiency-making it the optimal choice for new high-reliability bus-buffering designs requiring zero external termination and minimal power overhead.
Availability
SNJ54BCT2244J is available at Aetrix Electronics and suitable for aerospace vehicle control, radar subsystems, and hardened industrial computing requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SNJ54BCT2244J 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 high-reliability components for industrial, automotive, and defense markets.
The SNJ54BCT2244J belongs to TI's military-grade BCT logic family, engineered specifically for high-density, high-speed memory address and bus driving in mission-critical systems where signal integrity, thermal resilience, and long-term supply assurance are mandatory.
FAQ
What is the operating temperature range specified for SNJ54BCT2244J?
The SNJ54BCT2244J is fully qualified for operation from −55°C to +125°C per MIL-PRF-38535 Class B requirements. All electrical parameters-including propagation delay, output drive, and input thresholds-are tested across this full range, making SNJ54BCT2244J suitable for engine bay, avionics, and space-qualified applications where ambient extremes are routine.
Does SNJ54BCT2244J require external series resistors for bus driving?
No, SNJ54BCT2244J does not require external series resistors. Each of its eight outputs incorporates a precisely trimmed 33-Ω series resistor to suppress overshoot and undershoot on transmission lines. This integrated termination eliminates eight discrete components, reduces PCB area, and ensures consistent impedance matching-key advantages confirmed in SNJ54BCT2244J's official datasheet Figure 1 load circuit and electrical characteristics table.
How is the 3-state output behavior controlled on SNJ54BCT2244J?
The SNJ54BCT2244J uses two active-low output-enable inputs: 1OE controls the first four outputs (1Y1–1Y4), and 2OE controls the second four (2Y1–2Y4). When either OE is low, its associated outputs enter high-impedance mode; when high, outputs follow their respective inputs. To guarantee high-impedance during power-up, TI recommends tying both OE pins to VCC through pullup resistors-minimum value determined by driver sink capability, as specified in SNJ54BCT2244J's functional description section.
What packaging and marking details apply to SNJ54BCT2244J?
SNJ54BCT2244J is supplied in a 20-pin hermetically sealed Ceramic Dual-In-Line Package (CDIP-J) with tin-lead (SNPB) leads and no RoHS compliance. The top-side marking reads "SNJ54BCT2244J", and it ships in tubes of 20 units. This package meets MIL-STD-883 requirements for moisture resistance, thermal shock, and mechanical robustness-critical for SNJ54BCT2244J deployment in high-vibration, high-reliability military platforms.
Can SNJ54BCT2244J directly interface with modern 3.3-V logic systems?
SNJ54BCT2244J is not designed for direct 3.3-V logic interfacing. Its inputs require TTL-level thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and operate from 4.5–5.5 V, so connecting to 3.3-V outputs risks violating VIH minimums and may cause unreliable switching. For mixed-voltage systems, SNJ54BCT2244J must be paired with level translators or used exclusively in 5-V domains-as intended in its original application scope for memory address and bus driving in legacy military hardware.
SNJ54BCT2244J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
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- Bulk
- Product Status:
- Active
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SNJ54BCT2244J FAQ
1.How can I place an order for SNJ54BCT2244J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54BCT2244J 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 SNJ54BCT2244J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54BCT2244J is usually 5 days.
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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 SNJ54BCT2244J?
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6.How does Aetrix verify that SNJ54BCT2244J is sourced from the original manufacturer or authorized distributors?
All SNJ54BCT2244J 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 SNJ54BCT2244J meets industry standards.
7.What is the process for return or replacement of SNJ54BCT2244J?
All SNJ54BCT2244J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT2244J, 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 SNJ54BCT2244J part is unused and in its original packaging.
Return procedure for SNJ54BCT2244J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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