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Texas Instruments SNJ54AS873AJT
- Part No.:
- SNJ54AS873AJT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54AS873AJT.pdf
- Description:
- BUS DRIVER, AS SERIES
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Inventory:431
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Product details
Overview
SNJ54AS873AJT from Texas Instruments is a dual 4-bit transparent D-type latch with 3-state bus-driver outputs, military-grade (−55°C to 125°C), 24-pin ceramic DIP (JT) package, VCC = 4.5–5.5 V, IOL = 48 mA per output, and tPHL(D→Q) = 7.5 ns (max at 70°C equivalent). It serves as a bidirectional bus interface in avionics data acquisition systems.
For engineers reviewing the SNJ54AS873AJT datasheet, SNJ54AS873AJT pinout, SNJ54AS873AJT application, or SNJ54AS873AJT equivalent, key selection criteria include military temperature range compliance, 48 mA sink capability per output, 3-state bus-driving architecture, latch-enable timing (tw ≥ 5 ns), and ceramic DIP hermetic packaging for high-reliability signal routing.
Technical Context
This device implements two independent 4-bit latches with separate LE, CLR, and OE controls per section. Each latch operates in transparent mode when LE is high (Q follows D), latches on LE falling edge, clears asynchronously via low-active CLR, and enters high-impedance state when OE is high.
It uses bipolar AS (Advanced Schottky) logic technology, delivering faster switching than ALS variants: tPLH(D→Q) ≤ 12.5 ns, tPHL(LE→Q) ≤ 9 ns, and VOL ≤ 0.5 V at IOL = 48 mA - enabling direct TTL/LS bus driving without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/LS power rails and tolerant of supply ripple. |
| Operating Temp | −55°C to 125°C - qualified per MIL-STD-883 for aerospace and defense embedded control. |
| IOL per Output | 48 mA - drives up to 20 standard TTL loads directly; eliminates need for external line drivers. |
| tPHL (D→Q) | ≤ 7.5 ns - supports >100 MHz data capture in synchronous bus applications with tight setup/hold margins. |
| Output Type | 3-State (active-low OE) - enables bidirectional shared-bus operation with collision-free arbitration. |
| Logic Family | AS (Advanced Schottky) - lower propagation delay and higher drive strength than ALS or LS families. |
| Package | Ceramic DIP (JT), 24-pin - hermetically sealed, moisture-resistant, and suitable for high-vacuum or extended-life deployments. |
Pinout & Package
Ceramic Dual-In-Line Package (JT), 24-pin, hermetically sealed, 0.600-inch wide body, compliant with MIL-STD-1835 GDIP3-T24 and JEDEC MO-058 AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input (active-low) | Forces respective Q1–Q4 outputs low regardless of LE or OE state; used for system reset synchronization. |
| 1OE, 2OE | Output enable (active-low) | Controls 3-state output driver enable/disable; essential for bus contention management in multiplexed architectures. |
| 1LE, 2LE | Latch-enable (active-high) | Enables transparency (Q follows D); latching occurs on falling edge - critical for clock-domain crossing in legacy bus designs. |
| 1D1–1D4, 2D1–2D4 | Data inputs | Four parallel data bits per latch section; accepts standard TTL-level signals (VIH ≥ 2 V, VIL ≤ 0.8 V). |
| 1Q1–1Q4, 2Q1–2Q4 | 3-state buffered outputs | Drive bus lines directly; high-impedance when OE = high, low-impedance push-pull when enabled. |
| VCC, GND | Power supply terminals | Single 5 V supply; decoupling required at each VCC pin due to high transient current (ICC up to 129 mA during switching). |
| NC | No internal connection | Pins 3, 5, 12, 13, 25, 26 - unused; must remain unconnected to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit latch sections | Enables simultaneous storage and isolation of two 4-bit data words - ideal for register file partitioning in flight control computers. |
| 3-state bus-driver outputs | Permits direct connection to shared data buses without external transceivers; OE-controlled directionality reduces PCB layer count. |
| Military temperature qualification | Validated across −55°C to 125°C per MIL-STD-883 Method 1010 - ensures reliability in jet engine-mounted sensor interfaces. |
| AS logic speed grade | Delivers tPHL(LE→Q) ≤ 9 ns and tPLH(D→Q) ≤ 12.5 ns - meets timing closure for 20 MHz synchronous bus cycles with margin. |
| High-current sinking capability | 48 mA per output sustains robust noise immunity in electrically noisy avionics bays - exceeds standard TTL fan-out requirements. |
Applications
| Avionics Data Bus Interface | Flight Control Register File |
|---|---|
Use Scenario: Interfacing analog-to-digital converters (ADCs) to a MIL-STD-1553B remote terminal data bus in a radar warning receiver. IC Role / Device Role / Timing Role: Latches digitized IF sample data before transmission; LE synchronized to ADC conversion complete, OE timed to bus arbitration window. Use Value: Eliminates glue logic; 48 mA drive ensures signal integrity over 30 cm backplane traces at 10 MHz burst rates. | Use Scenario: Storing pitch/roll/yaw actuator command words in a triple-modular redundant (TMR) flight controller. IC Role / Device Role / Timing Role: Acts as working register for real-time PID loop outputs; CLR tied to watchdog timeout, OE controlled by master arbitration logic. Use Value: Hermetic JT package prevents moisture-induced parameter drift; −55°C to 125°C rating matches aircraft environmental envelope. |
| Secure Crypto Key Buffer | Radar Pulse Timing Generator |
Use Scenario: Holding encrypted key segments during secure boot in a classified mission computer. IC Role / Device Role / Timing Role: Stores key fragments under physical isolation; CLR asserted only during cold start, OE disabled except during authenticated load cycles. Use Value: AS-family low leakage (<50 µA IOZL) prevents key remanence; ceramic package resists TEMPEST side-channel emissions. | Use Scenario: Generating precisely timed trigger pulses for phased-array antenna element drivers in ground-based radar. IC Role / Device Role / Timing Role: Latches pulse-width and delay values from FPGA; LE edge-triggered by system clock, Q outputs drive high-speed comparators. Use Value: 7.5 ns max tPHL guarantees sub-10 ns jitter accumulation across 16-element timing chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit latch with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS873BJT | ALS family: slower (tPHL(D→Q) ≤ 17 ns), lower IOL (24 mA), lower ICC (≤31 mA) | Suitable for non-critical timing paths where power efficiency outweighs speed; not recommended for >5 MHz bus operation. | Select when thermal budget is constrained and full AS speed is unnecessary. |
| SNJ54AS873AFK | LCCC (FK) package: 28-pin ceramic chip carrier, same electrical specs, different pinout and footprint | Used where board space is limited and surface-mount assembly is preferred; requires re-layout due to incompatible pin mapping. | Choose for compact, high-density layouts requiring SMT compatibility and identical timing performance. |
Compared with SNJ54ALS873BJT, SNJ54AS873AJT delivers 2.3× faster propagation and double the drive strength - critical for deterministic bus arbitration. Against SNJ54AS873AFK, it offers identical logic performance but in through-hole JT format for manual repairability and vibration resistance in ruggedized chassis.
Availability
SNJ54AS873AJT is available at Aetrix Electronics and suitable for avionics data acquisition, flight control register buffering, and secure crypto key storage requiring stable component supply across extended product lifecycles.
Supply support for SNJ54AS873AJT 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.
The SNJ54AS873AJT belongs to TI's military-grade Advanced Schottky (AS) logic family, designed specifically for high-speed, high-drive bus interfacing in aerospace, defense, and industrial control systems where timing determinism and environmental resilience are mandatory.
FAQ
What is the maximum operating temperature range for SNJ54AS873AJT?
The SNJ54AS873AJT is characterized for operation from −55°C to 125°C per MIL-STD-883, making it suitable for deployment in jet engine compartments, satellite payload bays, and other extreme thermal environments. This rating is verified across all electrical parameters including propagation delay, output drive, and leakage current - no derating is required within this full range. The ceramic JT package contributes to thermal stability and long-term parameter retention.
Does SNJ54AS873AJT support true bidirectional bus operation?
Yes, SNJ54AS873AJT supports bidirectional bus operation via its dual independent 3-state outputs and separate OE controls. Each 4-bit section can be enabled or disabled independently, allowing one section to drive while the other receives - essential for half-duplex protocols like MIL-STD-1553B subsystem interfaces. The active-low OE inputs simplify integration with standard bus arbitration logic and eliminate need for external direction-control gates.
What is the minimum pulse width required on LE for reliable latching in SNJ54AS873AJT?
The minimum pulse width (tw) required on LE for reliable latching in SNJ54AS873AJT is 5 ns at the military temperature extremes. This specification ensures robust capture of data transitions even under worst-case voltage and temperature conditions. Designers must ensure that the LE signal remains high for ≥5 ns before the data-stable window ends; shorter pulses risk metastability or incomplete latching, especially in high-noise avionics harnesses.
Can SNJ54AS873AJT drive standard TTL loads directly?
Yes, SNJ54AS873AJT can drive up to 20 standard TTL loads directly, based on its guaranteed IOL = 48 mA per output and VOL ≤ 0.5 V at that current. Its AS-family output stage provides sufficient sink current to maintain valid logic LOW levels across typical backplane trace impedances and capacitive loads up to 50 pF. No series termination or buffer ICs are needed for point-to-point or short-bus configurations meeting these constraints.
Is SNJ54AS873AJT RoHS-compliant?
SNJ54AS873AJT is not RoHS-compliant in its original manufacturing configuration. As a legacy military-grade ceramic DIP (JT) device produced under MIL-STD-883, it contains leaded solder seals and lead-based finishes per historical defense specifications. TI classifies it as obsolete with no Pb-Free conversion plan (TBD in Package Option Addendum). For RoHS-compliant alternatives, consider modern SOIC-packaged equivalents - though none match its full military temperature and hermetic sealing performance.
SNJ54AS873AJT 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:
- -
SNJ54AS873AJT FAQ
1.How can I place an order for SNJ54AS873AJT through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AS873AJT 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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The price and inventory of SNJ54AS873AJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AS873AJT is usually 5 days.
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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 SNJ54AS873AJT?
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6.How does Aetrix verify that SNJ54AS873AJT is sourced from the original manufacturer or authorized distributors?
All SNJ54AS873AJT 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 SNJ54AS873AJT meets industry standards.
7.What is the process for return or replacement of SNJ54AS873AJT?
All SNJ54AS873AJT units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AS873AJT, 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 SNJ54AS873AJT part is unused and in its original packaging.
Return procedure for SNJ54AS873AJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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