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Texas Instruments SNJ54ALS374AJ
- Part No.:
- SNJ54ALS374AJ
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54ALS374AJ.pdf
- Description:
- 54ALS374A OCTAL D-TYPE EDGE TRIG
- Quantity:
- Payment:
- Shipping:
Inventory:4,330
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Product details
Overview
SNJ54ALS374AJ from Texas Instruments is a military-grade octal D-type edge-triggered flip-flop with 3-state outputs, designed for high-capacitance bus driving in aerospace and defense systems. It operates across –55°C to 125°C, features 10 ns setup time, 4 ns hold time, and delivers ±24 mA output drive at 5 V supply.
For engineers reviewing the SNJ54ALS374AJ datasheet, SNJ54ALS374AJ pinout, SNJ54ALS374AJ application, or SNJ54ALS374AJ equivalent, this device is selected for high-reliability register buffering, bidirectional bus control, and I/O port expansion where temperature resilience and TTL-compatible timing are critical.
Technical Context
This device implements eight independent D-type latches triggered on the positive clock edge, each with true (non-inverted) Q output and individual D input. Its buffered OE input controls all eight outputs simultaneously without affecting internal state retention or data loading capability.
The SNJ54ALS374AJ uses ALS (Advanced Low-Power Schottky) logic technology, delivering 30 MHz maximum clock frequency and propagation delays as low as 3 ns (tPLH) under military temperature conditions. Output enable/disable transitions occur in 1–11 ns, enabling fast bus arbitration in real-time control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky), compatible with TTL voltage thresholds and drive levels |
| Operating Temperature | –55°C to +125°C - qualified for full military environmental stress screening per MIL-PRF-38535 |
| Max Clock Frequency | 30 MHz - supports synchronous data capture in high-speed digital subsystems |
| Output Drive | ±24 mA (IOL/IOH) - sufficient to drive 50-pF loads directly without external termination or pull-ups |
| Propagation Delay | tPLH = 3 ns, tPHL = 5 ns - enables tight timing margins in pipeline registers and address latches |
| 3-State Enable Time | tPZH = 3 ns, tPLZ = 5 ns - ensures rapid bus release for multi-master arbitration |
| Supply Voltage | 4.5 V to 5.5 V - stable operation across wide input rail variation common in avionics power distribution |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), J package, 20-pin, hermetically sealed, lead finish SNPB (tin-lead), MSL rating N/A (not applicable for through-hole ceramic packages).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 7, 8, 9, 10 | Data Inputs (D1–D8) | Asynchronous parallel data inputs synchronized to CLK↑; accept standard TTL logic levels |
| 2, 5, 6, 9, 12, 15, 16, 19 | Q Outputs (Q1–Q8) | True (non-inverted) latched outputs; placed in high-impedance state when OE = H |
| 11 | OE (Output Enable) | Active-low control: OE = L enables outputs; OE = H forces all Q pins to high-Z regardless of CLK or D state |
| 14 | CLK | Positive-edge-triggered clock input; initiates sampling of D inputs into flip-flop storage elements |
| 20 | VCC | +5 V power supply pin; decoupling required within 10 mm due to transient current demands during switching |
| 10 | GND | Signal and power ground reference; must be connected to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Full military temperature range | –55°C to +125°C operation verified per MIL-PRF-38535, eliminating derating calculations for space-grade designs |
| Independent data retention during 3-state | OE assertion does not disrupt internal latch state - allows background register updates while bus is released |
| High-drive 3-state outputs | 24 mA sink/source capability enables direct connection to 50-pF buses without interface components or pull-up resistors |
| Buffered control inputs | OE and CLK inputs include Schottky-clamped buffers - reduce noise susceptibility and improve fan-out to ≥10 LS-TTL loads |
| Parallel load architecture | All eight D inputs sampled simultaneously on CLK↑ - supports byte-wide register transfers in single-cycle operations |
Applications
| Avionics Data Bus Interface | Military Radar Signal Processing |
|---|---|
Use Scenario: Interfacing ADC/DAC modules to a 16-bit MIL-STD-1553B data bus controller via isolated buffer stage. IC Role / Device Role / Timing Role: Acts as a synchronized register bank that captures sensor samples on CLK↑ and presents them to the bus only when OE is asserted by the bus arbiter. Use Value: Eliminates need for discrete level-shifting or bus-hold circuits due to native 24 mA drive and TTL-compatible thresholds. |
Use Scenario: Holding intermediate FFT coefficients between processing stages in a phased-array radar front-end. IC Role / Device Role / Timing Role: Provides deterministic, edge-triggered storage with sub-10 ns timing margins, synchronized to FPGA-generated clocks. Use Value: Enables reliable data handoff across clock domains while maintaining integrity over extended thermal cycles. |
| Secure Communication Module | Tactical Vehicle Control Unit |
Use Scenario: Isolating cryptographic key registers from external I/O ports in a FIPS-140-2 compliant crypto module. IC Role / Device Role / Timing Role: Functions as tamper-resilient latch array: data loaded under secure firmware control, outputs enabled only during authenticated read cycles. Use Value: High-impedance isolation prevents side-channel leakage during idle periods; military temp rating ensures operation inside sealed enclosures. |
Use Scenario: Managing CAN and RS-485 transceiver enable lines and status feedback in an armored vehicle ECU. IC Role / Device Role / Timing Role: Serves as programmable I/O port expander with precise timing control for protocol handshaking signals. Use Value: Single-package solution replaces multiple discrete buffers, reducing PCB area and improving thermal reliability in vibration-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54AS374J | Faster timing: 125 MHz max clock, 2 ns setup, but higher ICC (84–128 mA) and reduced noise margin (VIK = –1.2 V vs –1.5 V) | Better suited for ultra-high-speed test equipment; less tolerant of marginal signal integrity or noisy power rails | Select SNJ54AS374J only when >30 MHz operation is mandatory and power/thermal budgets allow. |
| SN54ALS374AJ | Identical ALS logic family, pinout, and DC specs; differs only in part marking and qualification documentation path (MIL-PRF-38535 Class B vs Class V) | No functional difference; SN54ALS374AJ may carry different traceability or lot-level testing records per program requirements | SN54ALS374AJ is functionally interchangeable; choose based on contractual compliance documentation needs. |
Compared with SNJ54AS374J and SN54ALS374AJ, the SNJ54ALS374AJ offers optimal balance of speed, power efficiency, and noise immunity for general-purpose military register applications - especially where long-term reliability under thermal cycling is prioritized over peak frequency.
Availability
SNJ54ALS374AJ is available at Aetrix Electronics and suitable for avionics data interfaces, radar signal processing, secure communication modules, and tactical vehicle control units requiring stable component supply across extended product lifecycles.
Supply support for SNJ54ALS374AJ 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 with over 50 years of analog and logic IC development, serving aerospace, defense, industrial, and automotive markets.
The SNJ54ALS374AJ belongs to TI's military-grade ALS logic family, engineered specifically for high-reliability register and bus-interface functions in harsh-environment electronics where long-term parametric stability and radiation-tolerant packaging are essential.
FAQ
What is the operating temperature range of the SNJ54ALS374AJ?
The SNJ54ALS374AJ is characterized for continuous operation from –55°C to +125°C, meeting MIL-PRF-38535 Class V requirements. This range is validated across all electrical parameters including propagation delay, setup/hold times, and output drive strength - no derating is required within these limits.
Is the SNJ54ALS374AJ pin-compatible with SN74ALS374A?
No - the SNJ54ALS374AJ uses a ceramic DIP (J) package rated for –55°C to +125°C, while SN74ALS374A uses plastic DIP (N) or SOIC (DW) packages rated 0°C to +70°C. Pin numbering and signal mapping are identical, but thermal, reliability, and packaging specifications differ significantly.
Does OE affect internal flip-flop state in the SNJ54ALS374AJ?
No. The OE input in the SNJ54ALS374AJ controls only the output drivers. Internal latched data remains fully retained whether OE is high (outputs disabled) or low (outputs active), allowing uninterrupted data loading or retention during bus arbitration.
What is the maximum clock frequency supported by the SNJ54ALS374AJ?
The SNJ54ALS374AJ supports a maximum clock frequency of 30 MHz under full military temperature conditions (–55°C to +125°C). This value is guaranteed by timing characterization and reflects worst-case performance across voltage, temperature, and process corners.
Can the SNJ54ALS374AJ drive a 50-pF bus directly without external components?
Yes. The SNJ54ALS374AJ provides ±24 mA output drive capability and is specified with 50-pF load conditions in its switching characteristics table. Its 3-state outputs transition cleanly without ringing or overshoot, enabling direct connection to standard PCB traces and backplanes.
SNJ54ALS374AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54ALS374AJ FAQ
1.How can I place an order for SNJ54ALS374AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS374AJ 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 SNJ54ALS374AJ reliable?
The price and inventory of SNJ54ALS374AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS374AJ is usually 5 days.
3.What payment methods are accepted for SNJ54ALS374AJ?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54ALS374AJ?
SNJ54ALS374AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ALS374AJ 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 SNJ54ALS374AJ?
For technical support, including SNJ54ALS374AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS374AJ requirements.
6.How does Aetrix verify that SNJ54ALS374AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS374AJ 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 SNJ54ALS374AJ meets industry standards.
7.What is the process for return or replacement of SNJ54ALS374AJ?
All SNJ54ALS374AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS374AJ, 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 SNJ54ALS374AJ part is unused and in its original packaging.
Return procedure for SNJ54ALS374AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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