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Texas Instruments SNJ54ALS258AJ
- Part No.:
- SNJ54ALS258AJ
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
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- -
- Datasheet:
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SNJ54ALS258AJ.pdf
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- 54ALS258A QUAD 2-LINE TO 1-LINE
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Product details
Overview
SNJ54ALS258AJ from Texas Instruments is a military-grade 4-bit dual 2-line-to-1 data selector/multiplexer with 3-state outputs, designed for bus interface in high-performance digital systems. It operates across −55°C to 125°C, features 16-pin CDIP (J) package, supports 5 V supply, and delivers 24 mA low-level output drive. It enables selective routing of two 4-bit data sources to four shared output lines under A/B control and OE enable.
For engineers reviewing the SNJ54ALS258AJ datasheet, SNJ54ALS258AJ pinout, SNJ54ALS258AJ application, or SNJ54ALS258AJ equivalent, this page provides verified functional specifications, military-temperature operation context, bus-compatible 3-state timing behavior, and direct substitution guidance for legacy TTL-based system upgrades and aerospace avionics bus architectures.
Technical Context
The SNJ54ALS258AJ implements dual independent 2:1 multiplexing per bit lane - each Y output selects between corresponding A and B inputs based on the common A/B select line. Its 3-state outputs are disabled when OE is high, isolating the bus during contention or standby. The device uses ALS (Advanced Low-Power Schottky) TTL logic, offering improved speed-power tradeoff over standard LS.
Propagation delays are specified under military temperature extremes: tPLH/tPHL from A/B or data inputs to Y outputs range from 1–12 ns (VCC = 4.5–5.5 V, CL = 50 pF); enable/disable times (tPZH/tPZL/tPHZ/tPLZ) span 2–37 ns. Input thresholds (VIH = 2 V min, VIL = 0.8 V max) and output drive (IOL = 24 mA, IOH = −2.6 mA) ensure robust noise margin and bus loading compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS TTL - delivers 12 ns max propagation delay with 13 mA typical ICC (disabled), enabling high-speed bus arbitration without excessive power draw. |
| Operating Temperature | −55°C to 125°C - qualified for military/aerospace applications where extended thermal stability is mandatory for mission-critical hardware. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated 5 V systems; absolute max rating of 7 V prevents latch-up under transient overvoltage. |
| Output Drive | IOL = 24 mA / IOH = −2.6 mA - sufficient to drive multiple TTL loads or terminate stubs on backplane buses without external buffers. |
| 3-State Enable Timing | tPZH = 3 ns min / tPLZ = 37 ns max - fast turn-on but conservative turn-off ensures glitch-free bus release during dynamic switching. |
| Input Compatibility | VIH ≥ 2 V, VIL ≤ 0.8 V - matches standard TTL logic levels, allowing seamless integration with legacy 74-series and microprocessor address/data buses. |
| Package Type | 16-pin Ceramic Dual In-line Package (CDIP, J) - hermetically sealed, leaded, through-hole mount suitable for high-reliability, high-vibration environments. |
Pinout & Package
SNJ54ALS258AJ is housed in a 16-pin Ceramic Dual In-line Package (CDIP, J), 300-mil width, with 0.1-inch lead pitch and hermetic ceramic body. Pin 1 is marked by a beveled corner or notch; leads are tin-lead (SNPB) finished.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Data input A (bit 1–4) | First 4-bit data source; routed to Y outputs when A/B = L. |
| 1B, 2B, 3B, 4B | Data input B (bit 1–4) | Second 4-bit data source; routed to Y outputs when A/B = H. |
| 1Y, 2Y, 3Y, 4Y | 3-state output (bit 1–4) | Active-low enabled; high-impedance when OE = H - essential for bidirectional bus sharing. |
| A/B | Common select control | Single line selecting between A or B source for all four channels simultaneously. |
| OE | Output enable (active-low) | Global 3-state control; drives all Y outputs into high-Z when high - critical for bus arbitration. |
| VCC | Positive supply | 5 V nominal power rail; decoupling required near pin 16 to suppress switching noise. |
| GND | Ground reference | Signal and power return; must be low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 4-bit 2:1 multiplexing | Simultaneously routes two independent 4-bit words onto one 4-bit bus using shared A/B and OE controls - reduces component count in data path consolidation. |
| Military temperature qualification | Tested and guaranteed over −55°C to 125°C - eliminates derating calculations and enables use in unheated/externally exposed avionics and defense subsystems. |
| Bus-compatible 3-state outputs | Outputs present <20 µA leakage in high-Z mode (IOZL/IOZH) - prevents signal corruption when multiple devices share a common data bus. |
| ALS logic performance | Delivers 12 ns max tPHL at 24 mA load - faster than LS variants while consuming ~30% less power, ideal for dense, thermally constrained boards. |
| Standard TTL input thresholds | VIH = 2 V min / VIL = 0.8 V max - ensures interoperability with 74LS, 74F, and microcontroller GPIO without level-shifting. |
Applications
| Avionics Data Bus Arbitration | Military Microprocessor Address Decoding |
|---|---|
|
Use Scenario: Selecting between redundant sensor data streams (e.g., inertial measurement units) before feeding into a flight control processor's data bus. IC Role / Device Role / Timing Role: SNJ54ALS258AJ acts as a deterministic 4-bit data switch, synchronizing source selection with system clock edges and disabling outputs during bus turnaround. Use Value: Enables failover without software intervention; 3-state isolation prevents bus contention during switchover, meeting DO-254 safety requirements. |
Use Scenario: Routing memory-mapped I/O addresses from dual CPU cores to a shared peripheral controller in a ruggedized ground vehicle computer. IC Role / Device Role / Timing Role: SNJ54ALS258AJ serves as a hardware-controlled address multiplexer, with A/B selecting core origin and OE synchronized to bus grant signals. Use Value: Eliminates need for programmable logic; deterministic sub-15 ns propagation ensures timing closure in 8–10 MHz bus cycles. |
| Radar Signal Processing Backplane | Tactical Radio Baseband Interface |
|
Use Scenario: Multiplexing digitized IF samples from parallel ADC channels onto a shared FPGA capture bus in an airborne radar front-end. IC Role / Device Role / Timing Role: SNJ54ALS258AJ functions as a synchronous data selector, timed to ADC sample clocks and coordinated with FPGA read strobes via OE. Use Value: Supports 20+ MSPS aggregate throughput with no added jitter; CDIP package withstands vibration and thermal cycling in radar pod enclosures. |
Use Scenario: Switching between encryption engine output and clear-text baseband data paths in a SINCGARS-compatible radio transceiver module. IC Role / Device Role / Timing Role: SNJ54ALS258AJ performs real-time 4-bit symbol routing under crypto-control signals, with OE gating used for secure channel blanking. Use Value: Meets TEMPEST emission limits via controlled 3-state transitions; military temp rating ensures operation in desert or arctic field conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit dual 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS258AN | Commercial temperature range (0°C to 70°C); plastic DIP (N) package; identical logic function and pinout. | Not qualified for extended temperature or hermetic sealing; suitable for lab prototypes or non-mission-critical industrial controllers. | Select SN74ALS258AN only if operating environment stays within commercial specs and RoHS compliance is required. |
| SNJ54ALS257AJ | Same military temp range and CDIP (J) package, but implements inverted output logic (Y = A·OE' + B·A/B'·OE') versus SNJ54ALS258AJ's non-inverted Y = A·A/B' + B·A/B. | Requires logic inversion in upstream/downstream circuitry; not drop-in replaceable due to functional difference in truth table. | Choose SNJ54ALS257AJ only when system design explicitly requires active-low output behavior or matches legacy 257A-based schematics. |
Compared with SN74ALS258AN, SNJ54ALS258AJ offers guaranteed operation at −55°C and 125°C with hermetic packaging, while SNJ54ALS257AJ shares the same military qualification but differs in output polarity - requiring schematic validation before substitution.
Availability
SNJ54ALS258AJ is available at Aetrix Electronics and suitable for avionics data bus arbitration, military microprocessor address decoding, radar signal processing backplanes, and tactical radio baseband interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54ALS258AJ 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 logic solutions, with decades of heritage in military-qualified components and space-grade reliability standards.
The SNJ54ALS258AJ belongs to TI's 54ALS logic family, engineered specifically for high-reliability, high-speed digital systems in defense, aerospace, and industrial control where extended temperature operation and deterministic timing are non-negotiable.
FAQ
What is the operating temperature range of the SNJ54ALS258AJ?
The SNJ54ALS258AJ is characterized for operation from −55°C to 125°C, meeting MIL-PRF-38535 requirements for military-grade logic devices. This full-range qualification ensures reliable functionality in extreme environmental conditions such as aircraft bays, missile guidance sections, and satellite payload compartments - unlike commercial variants like SN74ALS258AN which are limited to 0°C–70°C.
Is the SNJ54ALS258AJ pin-compatible with SN74ALS258AN?
Yes, the SNJ54ALS258AJ is pin-compatible with SN74ALS258AN - both use 16-pin DIP footprints and identical pin assignments. However, SNJ54ALS258AJ uses a ceramic CDIP (J) package with tin-lead leads, while SN74ALS258AN uses a plastic PDIP (N) package with lead-free finish. Mechanical mounting and reflow profiles differ significantly.
Does the SNJ54ALS258AJ support hot-swap or live insertion?
No, the SNJ54ALS258AJ does not support hot-swap. Its absolute maximum ratings specify no voltage on disabled 3-state outputs beyond 5.5 V, and it lacks bus-hold or power-up 3-state protection. Insertion into a live bus may cause transient contention or latch-up; power sequencing and board-level protection circuitry are required for safe field replacement.
What is the logic function difference between SNJ54ALS258AJ and SNJ54ALS257AJ?
The SNJ54ALS258AJ implements non-inverting 2:1 multiplexing (Y = A·A/B' + B·A/B), whereas SNJ54ALS257AJ produces inverted outputs (Y = A·A/B' + B·A/B)' - confirmed by their respective function tables. This functional difference means they are not interchangeable without redesigning downstream logic or adding inverters.
Can SNJ54ALS258AJ drive a 50-pF bus load at 10 MHz?
Yes - with tPHL/tPLH ≤ 12 ns and CL = 50 pF specified in datasheet conditions, the SNJ54ALS258AJ supports clean signal edges up to ~35 MHz fundamental frequency. At 10 MHz, its 24 mA sink capability easily handles termination and fanout; however, proper VCC decoupling and ground layout remain essential to maintain signal integrity.
SNJ54ALS258AJ Specifications
- Product attributes
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- Texas Instruments
- Series:
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- Product Status:
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SNJ54ALS258AJ FAQ
1.How can I place an order for SNJ54ALS258AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS258AJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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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 SNJ54ALS258AJ?
For technical support, including SNJ54ALS258AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS258AJ requirements.
6.How does Aetrix verify that SNJ54ALS258AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS258AJ 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 SNJ54ALS258AJ meets industry standards.
7.What is the process for return or replacement of SNJ54ALS258AJ?
All SNJ54ALS258AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS258AJ, 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 SNJ54ALS258AJ part is unused and in its original packaging.
Return procedure for SNJ54ALS258AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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