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Texas Instruments SNJ54ALS640BW
- Part No.:
- SNJ54ALS640BW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54ALS640BW.pdf
- Description:
- BUS TRANSCEIVER, ALS SERIES
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Inventory:3,598
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Product details
Overview
SNJ54ALS640BW from Texas Instruments is a military-grade octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in high-reliability systems. It features inverting logic, 20-pin CFP (W) package, –55°C to 125°C operating range, and supports 12 mA low-level output current under standard conditions.
For engineers reviewing the SNJ54ALS640BW datasheet, SNJ54ALS640BW pinout, SNJ54ALS640BW application, or SNJ54ALS640BW equivalent, this device is selected for legacy aerospace, defense, and industrial control systems requiring TTL-compatible level translation, bus isolation via OE control, and deterministic propagation delay (tPLH/tPHL ≤14 ns).
Technical Context
The SNJ54ALS640BW implements dual-directional data flow controlled by DIR input: DIR = L enables B→A transmission; DIR = H enables A→B transmission. Output-enable (OE) asserts high-impedance state on all eight I/O ports when high, fully isolating both buses.
It uses ALS (Advanced Low-Power Schottky) logic technology, delivering lower power consumption than standard LS while maintaining compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V) and drive strength. Absolute maximum ratings include 7 V supply voltage and 5.5 V I/O port voltage, with storage temperature up to 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL systems and tolerates supply ripple without functional degradation. |
| Operating Temp | –55°C to 125°C - qualified for full military temperature range, enabling use in avionics, ground vehicles, and space-qualified subsystems. |
| IOL (Standard) | 12 mA - sufficient to drive multiple TTL inputs or short PCB traces without external buffering in legacy backplane designs. |
| tPLH / tPHL | ≤14 ns / ≤13 ns - guarantees sub-15 ns propagation delay for time-critical bus arbitration and synchronous handshake protocols. |
| 3-State Enable Time | tPZH ≤25 ns - fast output disable ensures minimal bus contention during direction switching or system reset sequences. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - matches standard TTL logic levels, eliminating need for level-shifting circuitry in mixed-logic systems. |
| Package | 20-pin CFP (W) - hermetically sealed ceramic flatpack with leads spaced 0.050″, suitable for high-vibration, high-reliability board assemblies. |
Pinout & Package
SNJ54ALS640BW is housed in a 20-pin Ceramic Flatpack (CFP, package drawing W), with gull-wing leads and center-indexed pin 1. The package is hermetically sealed, rated for harsh environmental operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: low = B-to-A data flow; high = A-to-B data flow. |
| 2–9 | A1–A8 | First 8-bit bidirectional data port (A-side), connected to local subsystem or processor bus. |
| 10 | GND | Power ground reference for logic and I/O circuits. |
| 11–18 | B1–B8 | Second 8-bit bidirectional data port (B-side), connected to peripheral or expansion bus. |
| 19 | OE | Output-enable active-low control: high = all outputs in high-impedance state; low = transceiver enabled. |
| 20 | VCC | +5 V supply input, decoupling required per MIL-STD-883 for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting Logic Architecture | Ensures signal polarity consistency across A/B ports without external inverters, reducing component count in bus repeater designs. |
| 3-State Bus Isolation | OE-controlled high-impedance outputs prevent bus contention during multi-master arbitration or hot-swap events in modular chassis systems. |
| Military Temperature Qualification | Validated from –55°C to 125°C per MIL-PRF-38535, supporting deployment in uncontrolled environmental enclosures and engine bays. |
| TTL-Compatible Interface | Direct replacement for legacy 74LS/74ALS transceivers without redesign-preserves existing timing margins and termination schemes. |
| Low Power Consumption | ICC = 27–60 mA (outputs low) - reduces thermal load in densely packed military backplanes where airflow is constrained. |
Applications
| Avionics Data Bus Interface | Ground Vehicle Control Module |
|---|---|
Use Scenario: Interfacing flight computer ARINC-429 receiver buffers to a centralized health-monitoring microcontroller via shared 8-bit parallel bus. IC Role / Device Role: Bidirectional bus transceiver managing time-multiplexed status updates and command acknowledgments between isolated subsystems. Use Value: Enables deterministic latency (≤14 ns) and guaranteed isolation during reset sequences, meeting DO-254 timing constraints for Level A hardware. |
Use Scenario: Connecting engine ECU's internal data bus to a diagnostic CAN gateway module using discrete parallel signaling. IC Role / Device Role: Level-translating and direction-controlled buffer isolating noisy powertrain signals from sensitive communication interfaces. Use Value: Military-grade temperature tolerance and 3-state control prevent bus lockup during cold cranking (–40°C) or exhaust heat exposure (>100°C). |
| Radar Signal Processing Chassis | Secure Communication Crypto Module |
Use Scenario: Routing digitized IF samples between ADC front-end and FPGA-based beamformer across a multi-slot VME backplane. IC Role / Device Role: High-speed octal transceiver synchronizing data transfers under DIR-controlled burst mode with OE-gated idle periods. Use Value: Sub-15 ns propagation delay preserves sample timing integrity across 12+ slot interconnects, avoiding skew-induced FFT degradation. |
Use Scenario: Isolating cryptographic key loading interface between secure microcontroller and tamper-evident memory bank in Type 1 encryption hardware. IC Role / Device Role: Physically unidirectional data path (A→B during load, B→A during verify) enforced via DIR/OE sequencing. Use Value: Hermetic CFP packaging and radiation-tolerant ALS process meet NSA/CSS Type 1 certification requirements for physical layer security. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS640BJ | Same ALS logic family and electrical specs, but in 20-pin CDIP (J) package with through-hole leads. | Preferred for prototyping, manual rework, or legacy wave-soldered assemblies where CFP reflow is unavailable. | Select SNJ54ALS640BJ if board assembly uses through-hole processes or requires visual solder joint inspection. |
| SNJ54AS640J | AS-family variant: faster propagation (tPLH ≤8 ns), higher drive (IOL = 48 mA), but increased ICC (78 mA typical). | Suitable for high-speed backplanes where timing margin is critical, but not for thermally constrained modules. | Choose SNJ54AS640J only when sub-10 ns delay is mandatory and power/thermal budget allows +30% current draw. |
Compared with SNJ54ALS640BW, SNJ54ALS640BJ offers identical functionality in a serviceable through-hole package, while SNJ54AS640J trades higher power for measurable speed gain-neither is pin-compatible due to differing package footprints (W vs J), requiring PCB layout revision.
Availability
SNJ54ALS640BW is available at Aetrix Electronics and suitable for avionics data bus interface, ground vehicle control module, radar signal processing chassis, and secure communication crypto module applications requiring stable component supply across extended product lifecycles.
Supply support for SNJ54ALS640BW 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 60 years of analog and logic innovation, headquartered in Dallas, Texas, serving aerospace, defense, industrial, and automotive markets.
The SNJ54ALS640BW belongs to TI's military-qualified logic portfolio, engineered specifically for high-reliability embedded systems demanding guaranteed performance across extreme temperature, vibration, and radiation environments.
FAQ
What is the operating temperature range for SNJ54ALS640BW?
The SNJ54ALS640BW is characterized for operation from –55°C to 125°C per MIL-PRF-38535, making it suitable for deployment in unheated avionics bays, engine compartments, and space-constrained military shelters where ambient temperatures exceed commercial limits. This range is validated through temperature cycling and burn-in testing.
Is SNJ54ALS640BW pin-compatible with SN74ALS640B?
No, SNJ54ALS640BW is not pin-compatible with SN74ALS640B. While both share identical pin functions and logic behavior, SNJ54ALS640BW uses a 20-pin CFP (W) package with gull-wing leads, whereas SN74ALS640B is offered in SOIC (DW) or PDIP (N) packages with different lead pitch and footprint. PCB layout must be redesigned for mechanical fit.
Does SNJ54ALS640BW support non-inverting data transfer?
No, SNJ54ALS640BW implements fixed inverting logic: data appearing at A1–A8 is inverted at B1–B8, and vice versa. This is inherent to its ALS gate architecture and cannot be disabled. System-level inversion must be handled externally or compensated in firmware if non-inverted paths are required.
What is the maximum output current capability of SNJ54ALS640BW?
The SNJ54ALS640BW provides 12 mA low-level output current (IOL) under standard recommended conditions (VCC = 4.5–5.5 V, TA = –55°C to 125°C). It does not support the 48 mA "–1" version-this higher drive rating applies only to commercial SN74ALS640B-1 variants, not the military SNJ54ALS640BW.
Can SNJ54ALS640BW be used with 3.3 V logic systems?
No, SNJ54ALS640BW is not designed for 3.3 V operation. Its absolute minimum VCC is 4.5 V, and input thresholds (VIH = 2 V, VIL = 0.8 V) assume 5 V rail operation. Interfacing with 3.3 V systems requires level-shifting circuitry or a dedicated 3.3 V–compatible transceiver such as SN74LVC8T245.
SNJ54ALS640BW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SNJ54ALS640BW FAQ
1.How can I place an order for SNJ54ALS640BW through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS640BW 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 SNJ54ALS640BW reliable?
The price and inventory of SNJ54ALS640BW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS640BW is usually 5 days.
3.What payment methods are accepted for SNJ54ALS640BW?
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4.How is shipping managed for SNJ54ALS640BW?
SNJ54ALS640BW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ALS640BW 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 SNJ54ALS640BW?
For technical support, including SNJ54ALS640BW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS640BW requirements.
6.How does Aetrix verify that SNJ54ALS640BW is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS640BW 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 SNJ54ALS640BW meets industry standards.
7.What is the process for return or replacement of SNJ54ALS640BW?
All SNJ54ALS640BW units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS640BW, 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 SNJ54ALS640BW part is unused and in its original packaging.
Return procedure for SNJ54ALS640BW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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