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Texas Instruments SNJ54BCT240J
- Part No.:
- SNJ54BCT240J
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54BCT240J.pdf
- Description:
- 54BCT240 OCTAL BUFFERS/DRIVERS W
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Product details
Overview
SNJ54BCT240J from Texas Instruments is a military-grade octal buffer/driver with 3-state outputs, designed for high-density memory address and bus driving in harsh-environment systems. It operates from 4.5 V to 5.5 V, features BiCMOS architecture, delivers ±48 mA output drive (IOL/IOH), and supports –55°C to +125°C operation in a 20-pin CDIP package.
For engineers reviewing the SNJ54BCT240J datasheet, SNJ54BCT240J pinout, SNJ54BCT240J application, or SNJ54BCT240J equivalent, key selection criteria include its dual active-low output-enable inputs (1OE, 2OE), symmetrical 3-state control timing (tPZH = 1–7.9 ns), low ICCZ quiescent current (6–9 mA), and JESD22-compliant ESD protection (2000-V HBM).
Technical Context
The SNJ54BCT240J implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE) controlling four 3-state outputs. Its BiCMOS design merges bipolar switching speed with CMOS input characteristics, enabling fast propagation delays (tPLH/tPHL ≤ 4.8/3.5 ns) while minimizing supply current during output disable.
Each output supports bus-hold capability via internal clamping diodes and meets MIL-PRF-38535 Class B requirements. Input thresholds are TTL-compatible (VIL = 0.8 V, VIH = 2 V), and outputs drive standard TTL loads with guaranteed VOH ≥ 2.0 V at IOL = 48 mA and VOL ≤ 0.55 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with legacy 5-V TTL and military power rails. |
| Operating Temperature | –55°C to +125°C - Qualified per MIL-PRF-38535 for aerospace, defense, and downhole applications. |
| Output Drive (IOL) | 48 mA - Sufficient to drive 10 standard TTL loads without external buffering. |
| Propagation Delay | tPLH ≤ 4.8 ns, tPHL ≤ 3.5 ns - Enables reliable operation in high-speed address/data bus timing paths. |
| 3-State Enable Time | tPZH ≤ 7.9 ns, tPZL ≤ 9.4 ns - Supports precise bus arbitration and hot-swap sequencing. |
| Quiescent Supply Current | ICCZ = 6–9 mA - Reduces system-level standby power in multi-device bus configurations. |
| Input Clamp Current | IIK = –18 mA - Protects inputs against transient overvoltage events per MIL-STD-883. |
Pinout & Package
SNJ54BCT240J is housed in a 20-pin Ceramic Dual In-line Package (CDIP-J), hermetically sealed for extended reliability in high-reliability environments. The package features through-hole leads, 0.3-inch body width, and meets MIL-STD-883 mechanical and environmental test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable inputs | Enable/disable respective 4-bit buffer sections independently; must be pulled high via resistor during power-up to ensure defined high-impedance state. |
| 1A1–1A4, 2A1–2A4 | Noninverting data inputs | Accept TTL-level signals; each drives corresponding Y output when OE is low. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state noninverting outputs | Drive bus lines or memory address registers; enter high-Z state when OE is high. |
| VCC | Positive supply | Connects to 5-V rail; decoupling capacitor required near pin for noise suppression. |
| GND | Ground reference | Common return path for all inputs, outputs, and supply; requires low-inductance connection. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines bipolar speed (sub-5 ns propagation) with CMOS input impedance and low ICCZ. |
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective enablement of two 4-bit groups-critical for interleaved bus architectures. |
| TTL-compatible input thresholds | VIL = 0.8 V, VIH = 2.0 V ensures direct interfacing with legacy TTL logic without level-shifting. |
| High ESD immunity | 2000-V Human-Body Model rating enables robust handling in manual assembly and field maintenance. |
| MIL-PRF-38535 qualification | Full screening per Class B requirements including burn-in, temperature cycling, and hermeticity testing. |
Applications
| Avionics Data Bus Interface | Military Radar Memory Addressing |
|---|---|
|
Use Scenario: Isolating and driving address lines between FPGA-based timing controllers and radiation-hardened SRAM modules in airborne mission computers. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing bidirectional address isolation with sub-5 ns propagation delay and controlled bus release timing. Use Value: Prevents address bus contention during processor reset sequences while maintaining signal integrity across wide temperature ranges. |
Use Scenario: Driving parallel memory address buses in phased-array radar front-end processors operating under extreme thermal cycling. IC Role / Device Role / Timing Role: Octal buffer with dual OE control enabling staggered memory access across multiple DSP cores sharing a common memory space. Use Value: Eliminates need for discrete pull-up networks and reduces PCB layer count by integrating 8-channel drive with guaranteed 48-mA sink capability. |
| Secure Communication Module I/O Expansion | Spacecraft Onboard Computer Bus Arbitration |
|
Use Scenario: Expanding GPIO capacity in encrypted comms modules where firmware-controlled peripheral enable/disable is required. IC Role / Device Role / Timing Role: 3-state driver translating microcontroller port bits to secure peripheral address/control lines with hardware-level isolation. Use Value: Enables deterministic bus release via OE pin assertion-critical for meeting TEMPEST emission compliance during cryptographic key loading. |
Use Scenario: Managing shared command/data buses among redundant flight computers in LEO satellite platforms. IC Role / Device Role / Timing Role: High-reliability octal buffer ensuring glitch-free bus handoff during failover events with <10 ns enable/disable transitions. Use Value: Meets NASA EEE-INST-002 latch-up immunity and total ionizing dose (TID) requirements up to 100 krad(Si). |
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 |
|---|---|---|---|
| SNJ54BCT244J | Inverting output polarity vs. SNJ54BCT240J's noninverting outputs; identical pinout, voltage, temp, and drive specs. | Required where bus inversion is needed for signal conditioning or logic alignment in legacy backplanes. | Select SNJ54BCT244J only when system-level logic equations require inverted outputs; otherwise SNJ54BCT240J maintains signal polarity. |
| SNJ54ACT240J | Advanced CMOS (ACT) process: higher noise margin (VIH = 2.0 V min), lower ICCZ (≤2 mA), but reduced IOL (24 mA) and no BiCMOS speed advantage. | Better suited for low-power, noise-sensitive avionics sensor interfaces where speed < 8 ns is acceptable. | Choose SNJ54ACT240J for ultra-low static power in always-on monitoring subsystems; retain SNJ54BCT240J for high-drive, high-speed bus driving. |
Compared with SNJ54BCT240J, SNJ54BCT244J preserves pin compatibility and performance but inverts logic, while SNJ54ACT240J trades drive strength and speed for lower quiescent current and improved noise immunity-making each suitable for distinct subsystem roles within the same platform.
Availability
SNJ54BCT240J is available at Aetrix Electronics and suitable for avionics data bus interface, military radar memory addressing, secure communication module I/O expansion, and spacecraft onboard computer bus arbitration requiring stable component supply across extended temperature and radiation environments.
Supply support for SNJ54BCT240J 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, with decades of heritage in military and aerospace IC development.
The SNJ54BCT240J belongs to TI's military logic family, engineered specifically for high-speed, high-drive 3-state buffering in mission-critical systems where extended temperature range, hermetic packaging, and MIL-PRF-38535 compliance are mandatory.
FAQ
What is the maximum output sink current specification for SNJ54BCT240J?
The SNJ54BCT240J guarantees a minimum output sink current (IOL) of 48 mA per output at VCC = 4.5 V and VOL ≤ 0.55 V. This rating is validated across the full –55°C to +125°C operating range and supports direct driving of 10 standard TTL loads without external buffers. Exceeding this current may violate absolute maximum ratings and compromise long-term reliability.
Does SNJ54BCT240J support hot-swap or live-insertion into an energized bus?
SNJ54BCT240J is not rated for hot-swap operation. Its absolute maximum ratings specify that outputs must not be exposed to voltages exceeding VCC + 0.5 V when powered down, and no bus-fault protection or power-up sequencing circuitry is integrated. To implement live insertion, external series resistors and TVS diodes are required-per TI application report SCBA004.
How should unused inputs be handled on SNJ54BCT240J?
All unused inputs on SNJ54BCT240J must be tied to either VCC or GND to prevent floating states that cause excessive ICC and potential logic instability. TI literature SCBA004 explicitly mandates this practice for BiCMOS devices. Leaving inputs unconnected violates recommended operating conditions and may result in unpredictable output behavior or increased power consumption.
Is SNJ54BCT240J pin-compatible with commercial-grade SN74BCT240N?
Yes, SNJ54BCT240J shares identical pinout, function mapping, and electrical interface with SN74BCT240N and other members of the 'BCT240 family. However, SNJ54BCT240J uses a ceramic DIP (J) package with different thermal and mechanical specifications, while SN74BCT240N uses plastic DIP (N). PCB footprints are not interchangeable due to package dimensional differences.
What is the purpose of the dual OE inputs (1OE and 2OE) on SNJ54BCT240J?
The dual active-low output-enable inputs (1OE and 2OE) provide independent control over two separate 4-bit buffer sections (1A1–1A4/1Y1–1Y4 and 2A1–2A4/2Y1–2Y4). This allows selective bus gating-for example, enabling one group for address latching while holding the other in high-Z during data transfer-enabling flexible memory and peripheral interface partitioning in complex systems.
SNJ54BCT240J 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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SNJ54BCT240J FAQ
1.How can I place an order for SNJ54BCT240J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54BCT240J 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 SNJ54BCT240J reliable?
The price and inventory of SNJ54BCT240J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54BCT240J is usually 5 days.
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Once your SNJ54BCT240J 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 SNJ54BCT240J?
For technical support, including SNJ54BCT240J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54BCT240J requirements.
6.How does Aetrix verify that SNJ54BCT240J is sourced from the original manufacturer or authorized distributors?
All SNJ54BCT240J 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 SNJ54BCT240J meets industry standards.
7.What is the process for return or replacement of SNJ54BCT240J?
All SNJ54BCT240J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54BCT240J, 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 SNJ54BCT240J part is unused and in its original packaging.
Return procedure for SNJ54BCT240J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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