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Texas Instruments SNJ54ALS534FK
- Part No.:
- SNJ54ALS534FK
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-CLCC
- Datasheet:
-
SNJ54ALS534FK.pdf
- Description:
- BUS DRIVER, ALS SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:4,168
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Product details
Overview
SNJ54ALS534FK from Texas Instruments is a military-grade octal D-type edge-triggered flip-flop with inverting 3-state outputs, designed for high-capacitance bus driving in avionics and ruggedized control systems. It operates across –55°C to 125°C, features 30 MHz max clock frequency, 12 mA low-level output drive, and buffered OE control enabling independent data retention during output disable.
For engineers reviewing the SNJ54ALS534FK datasheet, SNJ54ALS534FK pinout, SNJ54ALS534FK application, or SNJ54ALS534FK equivalent, this device serves as a high-reliability, temperature-hardened register for bidirectional data buses, I/O port expansion, and synchronous latch functions in legacy TTL-compatible military and aerospace platforms.
Technical Context
This device implements eight independent D-type latches triggered on the positive clock edge, each producing inverted Q outputs. Its 3-state outputs are controlled by a dedicated buffered OE input that does not affect internal flip-flop state - allowing new data capture or hold while outputs remain high-impedance.
The SNJ54ALS534FK uses ALS (Advanced Low-Power Schottky) logic technology, delivering lower power than standard LS while maintaining TTL-compatible voltage thresholds (VIH = 2 V min, VIL = 0.8 V max) and robust noise immunity. Its 20-pin ceramic flatpack (FK) package supports hermetic sealing and thermal cycling resilience required for extended mission-critical operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky), TTL-compatible input/output levels |
| Operating Temperature | –55°C to 125°C - qualified for full military environmental stress screening |
| Max Clock Frequency | 30 MHz - enables high-speed synchronous data capture in real-time control loops |
| Output Drive (IOL) | 12 mA - sufficient to drive 50-pF loads or terminated 50-Ω transmission lines without external buffers |
| Propagation Delay (tPLH/tPHL) | 3–18 ns - predictable timing window for critical setup/hold compliance in deterministic systems |
| 3-State Enable Time (tPZH/tPHZ) | 1–12 ns - fast bus release for time-multiplexed shared resource arbitration |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with regulated 5-V military power rails and tolerant of transient droop |
Pinout & Package
Ceramic flatpack (FK) package: 20-pin, 0.300-inch wide, hermetically sealed, leadless ceramic construction with solderable metallized terminations. Designed for high-reliability mounting on rigid PCBs using reflow or solder-dip processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: drives all 8 outputs to high-Z when high; no effect on internal latch state |
| 2–9 | 1D–8D | Data inputs - sampled on CLK↑; inverted values appear at corresponding Q outputs |
| 11–18 | 1Q–8Q | Inverted latched outputs - high-impedance when OE = high; otherwise drive complementary to D |
| 10 | GND | Signal reference ground - must be low-inductance connection for noise immunity |
| 20 | VCC | Positive supply - requires local 0.1 µF ceramic decoupling adjacent to pin |
| 19 | CLK | Clock input - positive-edge sensitive; minimum pulse width 16.5 ns (high/low) |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct connection to shared data buses without external inverters or pull-ups; eliminates contention during multi-master arbitration |
| Buffered OE input | High noise immunity and consistent enable/disable timing across temperature - prevents partial bus activation glitches |
| Retained internal state during OE high | Allows asynchronous data loading or preservation while bus is released - essential for fault-tolerant register staging |
| Military temperature qualification | Full –55°C to 125°C operation verified per MIL-STD-883, including burn-in and thermal cycling - suitable for flight-critical hardware |
| TTL-compatible interface | Direct drop-in replacement for legacy 54LS/74LS logic without level-shifting - maintains backward compatibility in aging systems |
Applications
| Avionics Data Bus Interface | Secure Ground Station I/O Port |
|---|---|
|
Use Scenario: Interfacing mission computers to ARINC 429 or MIL-STD-1553B peripheral controllers via parallel status/data registers. IC Role / Device Role / Timing Role: Synchronous latch and bus driver - captures sensor telemetry on CLK↑ and presents inverted status bits to shared backplane under OE control. Use Value: Enables deterministic sampling of analog-to-digital converter outputs while isolating the bus during command execution phases. |
Use Scenario: Expanding GPIO count on radiation-hardened FPGA-based ground station modems handling encrypted telemetry streams. IC Role / Device Role / Timing Role: Octal buffer register - holds encrypted packet headers prior to serial transmission, with OE synchronized to UART framing. Use Value: Provides glitch-free bus isolation during key rotation events, preventing header corruption during cryptographic state transitions. |
| Tactical Vehicle Control Unit | Nuclear Facility Monitoring System |
|
Use Scenario: Isolating engine control ECU signals from CAN bus transceivers in armored vehicle subsystems operating under extreme thermal cycling. IC Role / Device Role / Timing Role: Bidirectional bus driver - routes sensor feedback (e.g., RPM, temp) to microcontroller while shielding it from bus transients via 3-state disable. Use Value: Maintains functional integrity during 12 V battery dips and ESD events due to ALS family's inherent noise margin and latch-up immunity. |
Use Scenario: Latching radiation detector pulse counts in safety-critical reactor monitoring cabinets where long-term reliability and zero latent failure are mandated. IC Role / Device Role / Timing Role: Radiation-tolerant storage register - holds accumulated counts between periodic readouts, with OE disabled only during validated checksum transfer. Use Value: Ceramic FK package and military screening ensure >20-year operational life without parameter drift in gamma-rich environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS534AN | Plastic DIP (N) package; commercial temp range (0°C to 70°C); identical electrical specs and pinout | Not qualified for extended temperature or shock/vibe environments; unsuitable for airborne or field-deployed systems | Select when cost-sensitive industrial control boards require same logic function without military screening |
| SNJ54AS534FK | AS logic family; higher speed (125 MHz fmax), greater drive (48 mA IOL), but higher ICC (77–128 mA vs. 10–31 mA) | Requires tighter power delivery and thermal management; less noise margin (VIL = 0.8 V only) | Choose for high-throughput test equipment where speed outweighs power and noise constraints |
Compared with SN74ALS534AN, SNJ54ALS534FK provides guaranteed operation over –55°C to 125°C and hermetic reliability, while SNJ54AS534FK trades power efficiency and noise immunity for raw speed - making SNJ54ALS534FK optimal for thermally constrained, safety-critical embedded control where deterministic timing and long-term stability are paramount.
Availability
SNJ54ALS534FK is available at Aetrix Electronics and suitable for avionics data interfaces, secure ground station I/O expansion, and tactical vehicle control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54ALS534FK 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 decades of heritage in military-grade logic, analog, and embedded processing solutions, serving defense, aerospace, and industrial markets.
The SNJ54ALS534FK belongs to TI's 54ALS logic family - engineered specifically for high-reliability, temperature-extended digital interfacing in systems where legacy TTL compatibility, low power, and rugged packaging are non-negotiable design requirements.
FAQ
What is the maximum clock frequency supported by SNJ54ALS534FK?
The SNJ54ALS534FK supports a maximum clock frequency of 30 MHz across its full military temperature range (–55°C to 125°C). This rating is verified under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF), ensuring reliable edge-triggered operation in real-time avionics and control applications where timing predictability is critical. The SNJ54ALS534FK maintains this spec without derating.
Does SNJ54ALS534FK have non-inverting or inverting outputs?
The SNJ54ALS534FK has inverting outputs: each Q output presents the logical complement of its corresponding D input after the positive clock edge. This is confirmed in the device description, function table, and logic diagram of the official SDAS168B datasheet. The inversion is intrinsic to the 'ALS534A design and applies uniformly across all eight channels of the SNJ54ALS534FK.
Can SNJ54ALS534FK be used as a direct replacement for SN74ALS534AN in existing designs?
SNJ54ALS534FK shares identical pinout, logic function, and DC/AC electrical specifications with SN74ALS534AN, but adds military temperature range (–55°C to 125°C) and ceramic FK packaging. It is electrically and mechanically compatible for drop-in use where enhanced environmental robustness is needed - however, layout must accommodate FK package footprint and thermal mass differences versus plastic DIP.
What is the purpose of the buffered OE input on SNJ54ALS534FK?
The buffered OE (output enable) input on SNJ54ALS534FK provides high-noise-immunity control of the 3-state outputs without affecting internal flip-flop operation. When OE is high, all eight Q outputs enter high-impedance mode - isolating the device from the bus - while D inputs and clocked state transitions continue unaffected. This allows concurrent data loading or retention during bus arbitration, a key requirement in multi-master systems.
Is SNJ54ALS534FK RoHS compliant?
Yes, SNJ54ALS534FK is RoHS compliant. As documented in TI's packaging addendum, the FK package variant carries "Yes" for RoHS status, with lead finish specified as NIPDAU (nickel/palladium/gold). This compliance applies to both active production lots and legacy military-spec shipments meeting current environmental directives without exemption waivers.
SNJ54ALS534FK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-CLCC
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 30 MHz
- Max Propagation Delay @ V, Max CL:
- 18ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 31 mA
- Input Capacitance:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LCCC (8.89x8.89)
SNJ54ALS534FK FAQ
1.How can I place an order for SNJ54ALS534FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS534FK 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 SNJ54ALS534FK reliable?
The price and inventory of SNJ54ALS534FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS534FK is usually 5 days.
3.What payment methods are accepted for SNJ54ALS534FK?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54ALS534FK?
SNJ54ALS534FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ALS534FK 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 SNJ54ALS534FK?
For technical support, including SNJ54ALS534FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS534FK requirements.
6.How does Aetrix verify that SNJ54ALS534FK is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS534FK 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 SNJ54ALS534FK meets industry standards.
7.What is the process for return or replacement of SNJ54ALS534FK?
All SNJ54ALS534FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS534FK, 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 SNJ54ALS534FK part is unused and in its original packaging.
Return procedure for SNJ54ALS534FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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