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Texas Instruments SNJ54ALS112AJ
- Part No.:
- SNJ54ALS112AJ
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54ALS112AJ.pdf
- Description:
- 54ALS112A DUAL J-K NEGATIVE-EDGE
- Quantity:
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Inventory:3,225
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Product details
Overview
SNJ54ALS112AJ from Texas Instruments is a dual J-K negative-edge-triggered flip-flop IC designed for synchronous logic control in military-grade digital systems. It operates over −55°C to 125°C, features 25 MHz maximum clock frequency, 6 mW typical power dissipation per flip-flop, and fully buffered inputs for noise immunity - used in radar timing sequencers, avionics data latches, and hardened control state machines.
For engineers reviewing the SNJ54ALS112AJ datasheet, SNJ54ALS112AJ pinout, SNJ54ALS112AJ application, or SNJ54ALS112AJ equivalent, key selection criteria include its military temperature rating, CDIP (J) package with 16 pins, negative-edge clocking behavior, preset/clear dominance logic, and compatibility with 5-V TTL-level systems requiring high-reliability edge-triggered storage.
Technical Context
This device implements two independent J-K flip-flops with asynchronous active-low preset (PRE) and clear (CLR) inputs that override clocked operation. Each flip-flop samples J and K inputs during the hold-time window before the falling edge of CLK and updates Q/Q outputs on the negative-going transition.
It uses ALS (Advanced Low-Power Schottky) bipolar technology, delivering 25 MHz max clock frequency at VCC = 4.5–5.5 V, with propagation delays as low as 3 ns (tPLH from PRE/CLR to Q) and 5 ns (tPHL from CLK to Q), while maintaining full input buffering to reject fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clock Frequency | 25 MHz max - supports real-time control loops in airborne mission computers |
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated 5-V military power rails |
| Operating Temperature | −55°C to 125°C - qualified for missile guidance and space-qualified chassis |
| Power Dissipation | 6 mW per flip-flop typical - enables dense logic packing without forced cooling |
| Input Thresholds | VIL = 0.7 V, VIH = 2.0 V - ensures robust noise margin in electrically noisy platforms |
| Output Drive | IOL = 4 mA / IOH = −0.4 mA - directly interfaces with standard TTL loads |
| Propagation Delay | tPHL(CLK→Q) = 5 ns max - enables sub-40 ns state transitions in critical timing paths |
Pinout & Package
SNJ54ALS112AJ is supplied in a 16-pin Ceramic Dual-In-Line Package (CDIP, J package), 300-mil width, hermetically sealed for high-reliability environments. Pin 1 is marked via corner notch or bevel; package meets MIL-STD-1835 Class J requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLK, 2CLK | Clock input (negative-edge) | Triggers state update on falling edge; fully buffered against EMI |
| 1J, 1K, 2J, 2K | Data inputs | Define next-state logic per J-K truth table; high-impedance when PRE/CLR active |
| 1PRE, 2PRE | Asynchronous preset | Active-low: forces Q = H, Q̅ = L regardless of clock or J/K |
| 1CLR, 2CLR | Asynchronous clear | Active-low: forces Q = L, Q̅ = H regardless of clock or J/K |
| 1Q, 1Q̅, 2Q, 2Q̅ | Complementary outputs | Provide registered logic state; fan-out up to 10 standard TTL loads |
| VCC (Pin 14), GND (Pin 7) | Power supply | Single 5-V rail; decoupling required within 0.5 inch for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Fully buffered inputs | Isolates internal logic from board-level noise spikes common in radar transceivers |
| Negative-edge triggering | Enables precise synchronization to falling edges of master system clocks |
| Asynchronous PRE/CLR | Allows immediate state reset or initialization without waiting for clock edge |
| TTL-compatible voltage levels | Directly interfaces with legacy 5-V TTL families without level-shifting circuitry |
| Military temperature qualification | Validated across −55°C to 125°C for deployment in jet engine bays and satellite payloads |
Applications
| Radar Pulse Sequencing | Avionics Data Latching |
|---|---|
Use Scenario: Generating precisely timed trigger sequences for phased-array radar transmit/receive switching. IC Role / Device Role / Timing Role: Dual J-K flip-flop acts as synchronized state register controlling RF switch enable timing relative to pulse repetition interval. Use Value: 25 MHz clock capability and 5 ns CLK→Q delay ensure sub-40 ns timing resolution for beam-steering accuracy. | Use Scenario: Capturing sensor telemetry from inertial measurement units (IMUs) during high-G aircraft maneuvers. IC Role / Device Role / Timing Role: SNJ54ALS112AJ serves as edge-triggered latch holding sampled ADC output until host processor read cycle. Use Value: Asynchronous PRE/CLR allows immediate data capture reset after bus arbitration, preventing metastability in flight-critical paths. |
| Mission Computer State Machine | Hardened Communication Interface |
Use Scenario: Implementing fault-tolerant mode control logic in spacecraft onboard computers. IC Role / Device Role / Timing Role: Two independent flip-flops maintain redundant operational mode flags with deterministic edge-triggered updates. Use Value: −55°C to 125°C rating and ceramic DIP package ensure reliability during thermal cycling in low-earth orbit. | Use Scenario: Synchronizing UART handshaking signals across isolated power domains in naval combat systems. IC Role / Device Role / Timing Role: SNJ54ALS112AJ registers RTS/CTS handshake edges to eliminate ground-loop-induced glitches. Use Value: Fully buffered inputs reject >1 kV/µs transients induced by nearby RF amplifiers and motor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual J-K flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN54LS112J | Lower speed (15 MHz max), higher power (10 mW/FF), same CDIP-16 package | Acceptable for non-real-time control where timing margins exceed 60 ns | Select only if legacy LS-family compatibility is mandatory and speed penalty is acceptable |
| SNJ54F112J | Fast TTL variant: 35 MHz max clock, 22 mW/FF, tighter AC specs but narrower temp range (−55°C to 100°C) | Suitable for high-speed test equipment but not extended-temperature aerospace deployments | Choose when throughput >30 MHz is required and thermal envelope stays below 100°C |
Compared with SNJ54ALS112AJ, SN54LS112J trades speed and power efficiency for broader legacy support, while SNJ54F112J increases clock rate at the cost of thermal operating range and power - making SNJ54ALS112AJ the optimal balance for military-grade timing-critical logic.
Availability
SNJ54ALS112AJ is available at Aetrix Electronics and suitable for radar subsystems, avionics control modules, and hardened communication interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54ALS112AJ 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 high-reliability logic solutions for defense, aerospace, and industrial markets.
The SNJ54ALS112AJ belongs to TI's military-grade Advanced Low-Power Schottky (ALS) logic family, engineered for deterministic timing, EMI resilience, and operation under extreme environmental stress in mission-critical systems.
FAQ
What is the maximum clock frequency supported by SNJ54ALS112AJ?
The SNJ54ALS112AJ supports a maximum clock frequency of 25 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = −55°C to 125°C). This value is verified per the switching characteristics table in the SDAS199A datasheet and reflects guaranteed performance across the full military temperature range - not a typical or derated figure.
Does SNJ54ALS112AJ have pin-compatible alternatives in the same CDIP (J) package?
No documented pin-compatible replacement exists for SNJ54ALS112AJ in the CDIP (J) package. While SN54LS112J shares identical pinout and package, it is not functionally identical due to slower propagation delays and different AC electrical characteristics. Direct substitution requires full timing revalidation in the target system.
What is the purpose of the NC (no-connect) pins in SNJ54ALS112AJ?
SNJ54ALS112AJ has no NC pins. All 16 pins in the CDIP (J) package are assigned: Pins 1–8 and 9–16 correspond to 1CLK, 1K, 1J, 1PRE, 1Q, 1Q̅, 2Q, GND, VCC, 1CLR, 2CLR, 2CLK, 2K, 2J, 2PRE, 2Q̅ - confirmed by the top-view pin diagram in SDAS199A Rev. D.
Can SNJ54ALS112AJ operate reliably at 3.3 V supply voltage?
No. SNJ54ALS112AJ is specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, parameters including VOH, VOL, tPLH/tPHL, and setup/hold times fall outside guaranteed limits. Operation below 4.5 V risks functional failure, especially under temperature extremes or load variations.
How does the asynchronous PRE/CLR functionality behave when both are asserted simultaneously on SNJ54ALS112AJ?
When both PRE and CLR are low on either flip-flop of SNJ54ALS112AJ, the outputs enter a nonstable, undefined state (Q = Q̅ = H), as noted in the function table footnote. This condition violates the normal complementary output requirement and must be avoided in design - proper reset sequencing ensures only one asynchronous control is active at a time.
SNJ54ALS112AJ 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:
- -
SNJ54ALS112AJ FAQ
1.How can I place an order for SNJ54ALS112AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS112AJ 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 SNJ54ALS112AJ reliable?
The price and inventory of SNJ54ALS112AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS112AJ is usually 5 days.
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Once your SNJ54ALS112AJ 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 SNJ54ALS112AJ?
For technical support, including SNJ54ALS112AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS112AJ requirements.
6.How does Aetrix verify that SNJ54ALS112AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS112AJ 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 SNJ54ALS112AJ meets industry standards.
7.What is the process for return or replacement of SNJ54ALS112AJ?
All SNJ54ALS112AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS112AJ, 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 SNJ54ALS112AJ part is unused and in its original packaging.
Return procedure for SNJ54ALS112AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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