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Texas Instruments SNJ54ALS653W
- Part No.:
- SNJ54ALS653W
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54ALS653W.pdf
- Description:
- BUS TRANSCEIVER, ALS SERIES
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Inventory:1,706
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Product details
Overview
SNJ54ALS653W from Texas Instruments is a military-grade octal bus transceiver and register with open-collector A-side outputs, 3-state B-side outputs, and inverting data path logic. It operates across –55°C to 125°C, supports up to 25 MHz clock frequency, delivers 12 mA low-level output current on B ports, and features independent clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls for real-time or stored data routing between dual 8-bit buses.
For engineers reviewing the SNJ54ALS653W datasheet, SNJ54ALS653W pinout, SNJ54ALS653W application, or SNJ54ALS653W equivalent, this device is selected for high-reliability bidirectional bus management in avionics data acquisition, radiation-tolerant telemetry interfaces, and legacy military computing systems requiring stored-data multiplexing with glitch-free select control and open-collector drive capability on the A bus.
Technical Context
The SNJ54ALS653W integrates eight D-type flip-flops per bus, dual independent clock inputs (CLKAB for A→B storage, CLKBA for B→A storage), and select-control inputs (SAB/SBA) that eliminate decoding glitches during transitions between real-time and stored data modes. A low SAB/SBA selects real-time transfer; high enables stored-data output.
Its A-side outputs are open-collector (enabling wired-AND and level translation), while B-side outputs are 3-state. The inverting data path applies to both real-time and stored transfers. Input enable logic allows simultaneous storage on both buses via low-to-high clock transitions, regardless of OE or S states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal bus transceiver + dual-register with independent A/B clock and select control |
| Output Type | A-side: open-collector; B-side: 3-state; inverting data path |
| Max Clock Frequency | 25 MHz - defines maximum sustained data capture rate for stored-mode operation |
| IOL (B ports) | 12 mA - supports driving standard TTL loads without external pull-ups on B bus |
| Operating Temperature | –55°C to +125°C - qualified for extended military and aerospace environmental profiles |
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated 5-V systems; absolute max 7 V |
| Propagation Delay | tPLH(CLKBA→A): 16–71 ns - critical for timing budget in synchronous bus arbitration |
Pinout & Package
SNJ54ALS653W is housed in a 24-pin Ceramic Dual-In-Line Package (CDIP) with JT suffix, featuring hermetic sealing and lead finish suitable for high-reliability military applications. Pin numbering follows JEDEC MS-010 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKBA | Clock input controlling storage of B-bus data into internal registers for A-bus output |
| 2 | SBA | Select input: low = real-time B→A transfer; high = stored B→A transfer |
| 3 | OEBA | Output-enable for B-side drivers: low = active; high = 3-state (high-Z) |
| 4–11 | A1–A8 | Open-collector outputs (A bus); require external pull-up for logic HIGH |
| 12 | GND | Ground reference for all circuitry and I/O |
| 13 | VCC | +5 V power supply (4.5–5.5 V nominal) |
| 14–21 | B1–B8 | 3-state bidirectional I/O ports (B bus); direction controlled by OEBA/OEAB |
| 22 | OEAB | Output-enable for A-side drivers: low = active (open-collector sink); high = disabled |
| 23 | SAB | Select input: low = real-time A→B transfer; high = stored A→B transfer |
| 24 | CLKAB | Clock input controlling storage of A-bus data into internal registers for B-bus output |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free select control | Eliminates transient bus contention during SAB/SBA transitions between real-time and stored modes |
| Dual independent storage registers | Enables concurrent capture of A and B bus data on separate clock edges without mutual interference |
| Open-collector A outputs | Supports wired-AND bus architectures and mixed-voltage interfacing via external pull-up selection |
| Inverting data path | Provides complementary signal polarity required in differential or inverted logic domains |
| Real-time reinforcement mode | Simultaneous OEAB/OEBA low enables direct A↔B bus coupling without register latency |
Applications
| Avionics Data Acquisition | Military Telemetry Interface |
|---|---|
|
Use Scenario: Capturing sensor data from multiple analog-to-digital converters onto a shared MIL-STD-1553B-compatible parallel bus under extreme temperature cycling. IC Role / Device Role / Timing Role: SNJ54ALS653W acts as a buffered, registered bus interface-storing sampled values synchronously to CLKBA while enabling glitch-free switching between live sensor feeds and cached calibration tables via SBA. Use Value: The –55°C to +125°C rating and open-collector A outputs allow direct connection to legacy 1553B stubs with discrete pull-ups, eliminating need for level-shifting ICs. |
Use Scenario: Multiplexing telemetry streams from multiple subsystems (e.g., navigation, comms, power) onto a single downlink bus in a satellite payload module. IC Role / Device Role / Timing Role: SNJ54ALS653W serves as a time-multiplexed bus controller-using SAB/SBA to alternate between real-time telemetry bursts and pre-loaded status packets stored in its internal registers. Use Value: Independent CLKAB/CLKBA inputs permit asynchronous capture of each subsystem's data, avoiding inter-subsystem timing dependencies. |
| Radiation-Tolerant Computing | Legacy Military Computer Backplane |
|
Use Scenario: Interfacing FPGA-based processing nodes with radiation-hardened memory modules in a fault-tolerant flight computer architecture. IC Role / Device Role / Timing Role: SNJ54ALS653W provides registered, bidirectional data path between FPGA I/O banks and SRAM chips-leveraging its 3-state B outputs for memory read/write control and open-collector A outputs for interrupt signaling. Use Value: Open-collector A outputs enable robust wired-OR interrupt aggregation across multiple FPGAs without contention risk. |
Use Scenario: Replacing failed transceivers on a 1980s-era tactical computer backplane where bus loading, timing margins, and pin compatibility are strictly constrained. IC Role / Device Role / Timing Role: SNJ54ALS653W replicates original logic behavior-including inverting path, select-glitch immunity, and open-collector drive-ensuring drop-in functional equivalence with documented timing parameters. Use Value: Matches original SN54ALS653 timing specs (e.g., tPLH(CLKBA→A) ≤ 71 ns at –55°C), preserving system-level setup/hold compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS652JT | True (non-inverting) data path; 3-state outputs on both A and B sides; 35 MHz max clock | Used where signal polarity preservation is required and open-collector drive is unnecessary | Select when system design mandates non-inverted bus transfer and higher-speed real-time throughput is needed |
| SNJ54AS651JT | ALS-compatible pinout but AS-family speed: 75 MHz clock (characterized), lower propagation delay, higher IOL (32 mA) | Targeted at high-speed digital test equipment and radar signal processors needing faster capture | Choose only if board layout accommodates tighter noise margins and power delivery for AS-series switching transients |
Compared with SNJ54ALS652JT and SNJ54AS651JT, the SNJ54ALS653W uniquely combines open-collector A outputs with inverting logic and military temperature range-making it irreplaceable in wired-AND bus topologies requiring polarity inversion and guaranteed operation at –55°C.
Availability
SNJ54ALS653W is available at Aetrix Electronics and suitable for avionics data acquisition, military telemetry interfaces, radiation-tolerant computing, and legacy military computer backplane upgrades requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54ALS653W 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 specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The SNJ54ALS653W belongs to TI's military-grade ALS logic family, designed specifically for ruggedized digital systems requiring guaranteed performance across extreme temperatures, radiation environments, and long-term obsolescence resilience.
FAQ
What is the operating temperature range of the SNJ54ALS653W?
The SNJ54ALS653W is rated for operation from –55°C to +125°C, meeting MIL-PRF-38535 requirements for extended temperature military applications. This range is validated across all electrical specifications including clock frequency, propagation delay, and output drive strength-ensuring reliable function in avionics, space, and ground vehicle environments without derating.
Does the SNJ54ALS653W support simultaneous storage of data on both A and B buses?
Yes, the SNJ54ALS653W supports concurrent storage: a low-to-high transition on CLKAB stores A-bus data into the A→B register, while CLKBA stores B-bus data into the B→A register. These clocks operate independently, allowing synchronized or staggered capture without cross-interference-enabling dual-source data buffering in real-time systems.
How does the open-collector A-side output of the SNJ54ALS653W differ from its 3-state B-side outputs?
The SNJ54ALS653W A-side outputs (A1–A8) are open-collector and require external pull-up resistors to establish HIGH logic levels; they can only actively sink current. In contrast, B-side outputs (B1–B8) are 3-state and can actively drive HIGH or LOW, or enter high-impedance (Hi-Z) when OEBA is high-providing full bidirectional bus control without external components.
What is the maximum clock frequency supported by the SNJ54ALS653W?
The SNJ54ALS653W supports a maximum clock frequency of 25 MHz across its full –55°C to +125°C operating range. This value is specified in the recommended operating conditions table and verified by switching characteristics data (tPLH/tPHL limits), ensuring deterministic register capture timing in synchronous bus architectures.
Can the SNJ54ALS653W be used in a wired-AND configuration?
Yes-the open-collector A outputs of the SNJ54ALS653W are explicitly designed for wired-AND bus topologies. Multiple SNJ54ALS653W devices (or other open-collector drivers) can share a common A-bus line with a single pull-up resistor, enabling hardware-level logical AND of interrupt or status signals without additional logic gates.
SNJ54ALS653W 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:
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SNJ54ALS653W FAQ
1.How can I place an order for SNJ54ALS653W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS653W 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 SNJ54ALS653W reliable?
The price and inventory of SNJ54ALS653W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS653W is usually 5 days.
3.What payment methods are accepted for SNJ54ALS653W?
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4.How is shipping managed for SNJ54ALS653W?
SNJ54ALS653W orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ALS653W 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 SNJ54ALS653W?
For technical support, including SNJ54ALS653W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS653W requirements.
6.How does Aetrix verify that SNJ54ALS653W is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS653W 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 SNJ54ALS653W meets industry standards.
7.What is the process for return or replacement of SNJ54ALS653W?
All SNJ54ALS653W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS653W, 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 SNJ54ALS653W part is unused and in its original packaging.
Return procedure for SNJ54ALS653W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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