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Texas Instruments SNJ54ALS564BJ
- Part No.:
- SNJ54ALS564BJ
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SNJ54ALS564BJ.pdf
- Description:
- 54ALS564B OCTAL D-TYPE EDGE TRIG
- Quantity:
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Inventory:235
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Product details
Overview
SNJ54ALS564BJ from Texas Instruments is a military-grade octal D-type edge-triggered flip-flop with inverting 3-state outputs, designed for bus driving in high-reliability systems. It operates across –55°C to 125°C, features 20-pin CDIP (J) package, 22 MHz max clock frequency, and supports bidirectional bus control via independent OE gating without affecting internal state retention.
For engineers reviewing the SNJ54ALS564BJ datasheet, SNJ54ALS564BJ pinout, SNJ54ALS564BJ application, or SNJ54ALS564BJ equivalent, this device is selected for synchronous data latching in avionics backplanes, legacy military I/O port expansion, and radiation-tolerant register buffering where temperature resilience and bus isolation are critical.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high CLK transition, each with inverting output logic and high-impedance (Z) state controlled by an active-low OE input. Internal operation remains fully functional during output disable - enabling concurrent data capture and bus release.
The SNJ54ALS564BJ uses ALS (Advanced Low-Power Schottky) bipolar technology, delivering TTL-compatible voltage thresholds (VIH = 2 V min, VIL = 0.8 V max), 24 mA sink capability per output, and propagation delays as low as 4 ns (tPLH/tPHL) under military temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - enables TTL-level compatibility with reduced power vs standard LS. |
| Operating Temperature | –55°C to 125°C - qualified for full military environmental stress screening and extended-field deployment. |
| Max Clock Frequency | 22 MHz - supports synchronous data transfer in legacy MIL-STD-1553 or parallel bus subsystems. |
| Output Drive | 24 mA sink / –2.6 mA source - directly drives terminated 50 Ω transmission lines or multiple TTL inputs. |
| 3-State Enable Delay | tPHZ = 2 ns (min), tPLZ = 3 ns (max) - ensures fast bus turnaround with minimal contention window. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with regulated 5 V military power rails; immune to nominal 5 % tolerance drift. |
| Input Setup/Hold | tsu = 15 ns, th = 4 ns - defines minimum data stability window before/after CLK edge for reliable sampling. |
Pinout & Package
SNJ54ALS564BJ is housed in a 20-pin Ceramic Dual-In-Line Package (CDIP, J package), hermetically sealed for moisture resistance and thermal stability in harsh environments. Pin spacing is 0.1 inch (2.54 mm), with standard DIP footprint and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: disables all eight outputs to high-impedance state without affecting internal flip-flop state. |
| 2–9 | 1D–8D | Data inputs for each of eight D-type latches; sampled on rising CLK edge. |
| 10 | GND | Signal ground reference for logic and output drivers. |
| 11–18 | 1Q–8Q | Inverting 3-state outputs; Q = NOT D when enabled and CLK↑ occurs. |
| 19 | CLK | Clock input - edge-triggered on low-to-high transition; synchronizes all eight latches simultaneously. |
| 20 | VCC | Positive supply terminal - requires 4.5–5.5 V DC with local decoupling for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Alternating D/Q pins (e.g., 1D–1Q, 2D–2Q) minimize trace crosstalk and simplify PCB layout for parallel bus routing. |
| Buffered control inputs | OE and CLK inputs include Schottky-clamped buffers - reject noise spikes up to 1 ns and ensure clean edge detection. |
| State retention during OE disable | Internal latch state persists while outputs are tri-stated - allows pipelined data staging without clock gating. |
| 3-state inverting outputs | Outputs drive bus lines directly with polarity inversion - eliminates external inverters in complemented bus architectures. |
| Military screening compliance | Qualified per MIL-PRF-38535 Class B - includes burn-in, temperature cycling, and hermeticity testing. |
Applications
| Avionics Data Bus Interface | Military I/O Port Expansion |
|---|---|
Use Scenario: Interfacing discrete sensor signals to a centralized flight computer via a shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Synchronizes asynchronous analog-to-digital converter outputs using system clock edge, then presents latched values to bus with OE-controlled release timing. Use Value: Eliminates metastability risk at bus interface while maintaining deterministic timing across –55°C to 125°C operating range. |
Use Scenario: Expanding GPIO count on a ruggedized vehicle control module with legacy TTL-level peripherals. IC Role / Device Role / Timing Role: Acts as an output register for command signals (e.g., actuator enable, valve control) with simultaneous readback capability via shared bus. Use Value: Enables bidirectional bus sharing between microcontroller and peripheral ICs without external bus transceivers. |
| Radiation-Tolerant Register Buffer | Secure Boot Configuration Latch |
Use Scenario: Holding configuration bits for FPGA or ASIC startup in satellite subsystems exposed to total ionizing dose (TID). IC Role / Device Role / Timing Role: Stores boot-mode selection flags with non-volatile hold time maintained during power sequencing and reset assertion. Use Value: Provides single-event latchup (SEL)-immune storage using bipolar ALS process - no SRAM soft errors during orbital radiation exposure. |
Use Scenario: Securing hardware root-of-trust settings (e.g., debug disable, secure boot enable) prior to processor initialization. IC Role / Device Role / Timing Role: Captures fuse-programmed or strap-pin states at power-on-reset and holds them until firmware validates integrity. Use Value: Prevents runtime tampering by isolating critical security bits from software-accessible registers until authenticated boot completes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type bus-interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54AS564J | Faster propagation (tPLH/tPHL = 2.5 ns typ), higher ICC (28 mA), same CDIP-20 package and pinout. | Better suited for high-speed backplane timing but consumes more power and lacks ALS noise margin. | Select when >25 MHz clocking is required and thermal/power budget permits. |
| SN74ALS564BN | Commercial temperature range (0°C to 70°C), plastic DIP (N) package, RoHS-compliant lead finish. | Lower cost and reflow-compatible, but not rated for extended thermal or mechanical stress environments. | Select for ground-based test equipment or non-mission-critical industrial control where military qualification is unnecessary. |
Compared with SNJ54ALS564BJ, SNJ54AS564J trades power efficiency and noise immunity for speed, while SN74ALS564BN sacrifices environmental robustness for manufacturability and cost - making SNJ54ALS564BJ the sole choice for deployed military platforms requiring guaranteed operation across full military temperature and reliability specifications.
Availability
SNJ54ALS564BJ is available at Aetrix Electronics and suitable for avionics data bus interfaces, military I/O port expansion, and radiation-tolerant register buffering requiring stable component supply across long production lifecycles and extreme environmental conditions.
Supply support for SNJ54ALS564BJ 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 aerospace, defense, and industrial markets.
The SNJ54ALS564BJ belongs to TI's military-grade ALS logic family, engineered specifically for deterministic timing, bus isolation, and operational resilience in mission-critical electronic systems where failure is not an option.
FAQ
What is the maximum clock frequency supported by SNJ54ALS564BJ?
The SNJ54ALS564BJ supports a maximum clock frequency of 22 MHz across its full military temperature range (–55°C to 125°C). This rating is verified under worst-case conditions including VCC = 4.5 V, CL = 50 pF, and TA = 125°C. At 25°C and nominal 5 V supply, typical operation extends to 25 MHz, but design margins must respect the 22 MHz limit for guaranteed functionality in deployed systems.
Does SNJ54ALS564BJ retain internal state when outputs are disabled?
Yes, SNJ54ALS564BJ retains internal flip-flop state regardless of OE status. When OE is high (disabled), all eight outputs enter high-impedance (Z) mode, but clocked data capture continues normally on subsequent CLK↑ transitions. This allows continuous pipeline staging - new data can be loaded while previous data remains isolated on the bus - a key feature for time-critical bus arbitration schemes.
Is SNJ54ALS564BJ pin-compatible with SN74ALS564BN?
SNJ54ALS564BJ and SN74ALS564BN share identical 20-pin DIP pinout and logic function, but differ in package construction: SNJ54ALS564BJ uses ceramic CDIP (J) with tin-lead (SNPB) leads, while SN74ALS564BN uses plastic PDIP (N) with lead-free NiPdAu plating. Mechanical fit is identical, but thermal expansion, hermeticity, and solder profile requirements differ - direct substitution requires validation of board-level reliability under target environmental stress.
What is the purpose of the inverting outputs in SNJ54ALS564BJ?
The inverting outputs in SNJ54ALS564BJ provide direct compatibility with complemented bus architectures - such as those found in MIL-STD-1553 interface logic or legacy minicomputer data paths - eliminating the need for external inverters. Each Q output equals NOT D after a CLK↑ event, simplifying signal polarity alignment and reducing component count in space-constrained military PCB layouts.
Can SNJ54ALS564BJ operate from a 3.3 V supply?
No, SNJ54ALS564BJ requires a minimum supply voltage of 4.5 V and is specified only for operation between 4.5 V and 5.5 V. Its ALS bipolar process relies on TTL-compatible threshold voltages (VIH ≥ 2 V, VIL ≤ 0.8 V), which cannot be reliably sustained at 3.3 V. Attempting 3.3 V operation results in undefined logic states, increased propagation delay, and potential output contention - use SN74LVC574A or similar 3.3 V CMOS alternatives instead.
SNJ54ALS564BJ 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:
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- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54ALS564BJ FAQ
1.How can I place an order for SNJ54ALS564BJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS564BJ 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 SNJ54ALS564BJ reliable?
The price and inventory of SNJ54ALS564BJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS564BJ is usually 5 days.
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Once your SNJ54ALS564BJ 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 SNJ54ALS564BJ?
For technical support, including SNJ54ALS564BJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS564BJ requirements.
6.How does Aetrix verify that SNJ54ALS564BJ is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS564BJ 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 SNJ54ALS564BJ meets industry standards.
7.What is the process for return or replacement of SNJ54ALS564BJ?
All SNJ54ALS564BJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS564BJ, 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 SNJ54ALS564BJ part is unused and in its original packaging.
Return procedure for SNJ54ALS564BJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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