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Texas Instruments SNJ54LS379W
- Part No.:
- SNJ54LS379W
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54LS379W.pdf
- Description:
- D FLIP-FLOP, LS SERIES TTL
- Quantity:
- Payment:
- Shipping:
Inventory:4,017
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Product details
Overview
SNJ54LS379W from Texas Instruments is a quad D-type flip-flop with enable, designed for synchronous data latching in military-grade digital systems. It features 4 independent D-type storage elements, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), propagation delay of 25 ns typical at VCC = 5 V, and operates across –55°C to +125°C. It is used in radar signal conditioning and avionics control logic where radiation-tolerant, wide-temperature latch functionality is required.
For engineers reviewing the SNJ54LS379W datasheet, SNJ54LS379W pinout, SNJ54LS379W application, or SNJ54LS379W equivalent, this device serves as a temperature-hardened, quad-edge-triggered storage element with active-high enable-critical for deterministic timing in legacy aerospace bus interfaces and MIL-STD-1553 subsystems.
Technical Context
The SNJ54LS379W implements four independent positive-edge-triggered D flip-flops, each with a dedicated active-high enable (EN) input controlling clock gating per stage. Its internal architecture uses bipolar TTL circuitry with Schottky-clamped transistors to ensure noise immunity and stable metastability recovery.
All outputs are buffered, push-pull, and capable of driving 10 LS-TTL loads. The device lacks asynchronous reset or preset; state changes occur only on rising clock edges when EN is high, making it suitable for tightly synchronized pipeline stages in real-time control sequencers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 74LS-series systems and predictable fanout behavior. |
| Flip-Flop Count | Quad (4) - provides four isolated, edge-triggered storage bits in one CFP-16 package. |
| Propagation Delay | 25 ns typical (tPLH/tPHL) - supports reliable operation up to ~20 MHz clock rates in deterministic logic paths. |
| Supply Voltage | 4.5 V to 5.5 V - accommodates military power rail tolerances without regulation overhead. |
| Operating Temperature | –55°C to +125°C - qualified for extended-range deployment in airborne and space-qualified enclosures. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees robust noise margin against EMI in high-vibration platforms. |
| Output Drive | IOH = –0.4 mA / IOL = 8 mA - sufficient to directly interface with multiple LS-TTL inputs without buffering. |
Pinout & Package
SNJ54LS379W is housed in a 16-pin Ceramic Flatpack (CFP-W), hermetically sealed for moisture resistance and thermal stability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Data Input (D) | Four independent D inputs - each latches value on rising CLK edge when corresponding EN is high. |
| 2, 5, 10, 13 | Enable Input (EN) | Active-high per-stage enable - disables latching for that flip-flop regardless of CLK transitions. |
| 3, 6, 11, 14 | Q Output | True output of each flip-flop - no complementary outputs provided. |
| 7 | GND | Power return reference - requires low-inductance connection to minimize ground bounce in high-speed switching. |
| 16 | VCC | +5 V supply - must be decoupled locally with 0.1 µF ceramic capacitor per device. |
| 8, 15 | CLK | Shared clock input - all four flip-flops respond synchronously to the same rising edge. |
Key Features
| Feature | Design Value |
|---|---|
| Quad D-type with per-stage enable | Enables selective latching within a single package - reduces interconnect count vs. discrete flip-flop arrays. |
| Military temperature range (–55°C to +125°C) | Validated for use in uncontrolled environmental zones of aircraft and missile guidance electronics. |
| LS-TTL compatible voltage thresholds | Guarantees interoperability with legacy 74LS logic without level-shifting or redesign. |
| Hermetic CFP-W packaging | Provides long-term reliability under thermal cycling, humidity, and mechanical shock per MIL-STD-883. |
| No asynchronous controls | Simplifies timing analysis - eliminates race conditions from reset/preset skew in safety-critical sequencing. |
Applications
| Avionics Data Buffering | Radar Pulse Timing Sequencer |
|---|---|
Use Scenario: Capturing and holding sensor status words from analog-to-digital converters prior to MIL-STD-1553B bus transmission. IC Role / Device Role / Timing Role: Quad D-type latch providing synchronized, glitch-free registration of 4-bit status flags aligned to system master clock. Use Value: Eliminates metastability risk during asynchronous ADC read cycles while maintaining strict timing alignment across redundant channels. | Use Scenario: Storing pulse repetition interval (PRI) configuration bits in airborne fire-control radar timing generators. IC Role / Device Role / Timing Role: Edge-triggered storage element holding PRI selection codes under software control before hardware execution. Use Value: Ensures deterministic setup/hold timing margins between microcontroller writes and high-speed timing engine reads. |
| Flight Control Actuator Interface | Secure Communication Link Controller |
Use Scenario: Latching command validity signals from dual-redundant flight computers before actuator driver activation. IC Role / Device Role / Timing Role: Quad enable-gated D flip-flop validating four independent command channels with synchronized enable arbitration. Use Value: Prevents partial command updates during failover events by requiring simultaneous enable assertion across all four lanes. | Use Scenario: Holding encryption key reload enable bits in secure data link modems operating under DO-178C certification. IC Role / Device Role / Timing Role: Deterministic storage node ensuring cryptographic key update occurs only after full 4-bit handshake validation. Use Value: Supports traceable, auditable state transitions required for Level A airborne software certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LS378W | Hex D-type (6 flip-flops), same CFP-W package, identical timing and temperature specs. | Provides two additional storage bits - suitable when board layout allows reuse of footprint but requires higher channel density. | Select SNJ54LS378W only if six synchronized latches are needed; pinout differs (extra D/EN/Q pins), requiring PCB modification. |
| SNJ54LS377J | Octal D-type (8 flip-flops), CDIP-J package, same –55°C to +125°C range, 25 ns tPD. | Larger pin count (20-pin) and through-hole package - suited for prototyping or legacy board upgrades where CFP is not feasible. | Choose SNJ54LS377J for breadboard evaluation or repair of existing CDIP-based systems; not drop-in compatible with SNJ54LS379W. |
Compared with SNJ54LS378W and SNJ54LS377J, the SNJ54LS379W uniquely balances channel count (4), hermetic CFP packaging, and minimal pin count (16), making it optimal for space-constrained, high-reliability applications where exactly four synchronized latches are required without overdesign.
Availability
SNJ54LS379W is available at Aetrix Electronics and suitable for avionics data buffering, radar pulse timing sequencers, flight control actuator interfaces, and secure communication link controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54LS379W 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and defense markets.
The SNJ54LS379W belongs to TI's military-grade 54LS logic family, engineered specifically for high-reliability, wide-temperature digital control in aerospace and defense systems where long-term obsolescence resilience and MIL-PRF-38535 compliance are mandatory.
FAQ
What is the maximum clock frequency supported by SNJ54LS379W?
The SNJ54LS379W has a typical propagation delay of 25 ns, supporting reliable operation up to approximately 20 MHz in well-designed layouts with proper decoupling. Maximum usable frequency depends on setup/hold timing margins, PCB trace length, and load capacitance - actual system-level timing must be verified using worst-case parameters from the SDLS167 datasheet.
Does SNJ54LS379W include asynchronous reset or preset functionality?
No, the SNJ54LS379W does not include asynchronous reset or preset inputs. It relies solely on synchronous, positive-edge-triggered latching controlled by the shared CLK and individual EN inputs. This design simplifies timing analysis and avoids metastability risks associated with asynchronous control signals in safety-critical systems.
Is SNJ54LS379W pin-compatible with SN74LS379 or SN54LS379J?
No, SNJ54LS379W is not pin-compatible with SN74LS379 (commercial SOIC/PDIP) or SN54LS379J (CDIP-16). While all share identical logic function and pin assignment order, SNJ54LS379W uses a CFP-W package with gull-wing leads and different mechanical dimensions - requiring custom footprint and reflow profile. Electrical pin mapping matches, but physical mounting differs.
What is the meaning of "SNJ" prefix in SNJ54LS379W?
The "SNJ" prefix denotes a Texas Instruments military-grade product meeting MIL-PRF-38535 Class B or S requirements, including extended temperature qualification (–55°C to +125°C), rigorous screening, and hermetic packaging. It distinguishes the part from commercial "SN74" and standard military "SN54" variants, indicating enhanced reliability for defense-critical applications.
Can SNJ54LS379W drive standard TTL loads directly?
Yes, SNJ54LS379W can drive up to 10 LS-TTL loads per output (IOL = 8 mA, IOH = –0.4 mA), satisfying standard TTL fanout requirements. Its output structure is push-pull, eliminating need for external pull-ups. For heavier loads or longer traces, verify voltage margins using worst-case VOH/VOL values from the SDLS167 datasheet under –55°C and +125°C conditions.
SNJ54LS379W 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:
- -
SNJ54LS379W FAQ
1.How can I place an order for SNJ54LS379W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS379W 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 SNJ54LS379W reliable?
The price and inventory of SNJ54LS379W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS379W is usually 5 days.
3.What payment methods are accepted for SNJ54LS379W?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS379W transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54LS379W?
SNJ54LS379W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS379W 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 SNJ54LS379W?
For technical support, including SNJ54LS379W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS379W requirements.
6.How does Aetrix verify that SNJ54LS379W is sourced from the original manufacturer or authorized distributors?
All SNJ54LS379W 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 SNJ54LS379W meets industry standards.
7.What is the process for return or replacement of SNJ54LS379W?
All SNJ54LS379W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS379W, 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 SNJ54LS379W part is unused and in its original packaging.
Return procedure for SNJ54LS379W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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