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Texas Instruments SNJ54AS244J
- Part No.:
- SNJ54AS244J
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54AS244J.pdf
- Description:
- BUS DRIVER, AS SERIES
- Quantity:
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Inventory:3,771
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Product details
Overview
SNJ54AS244J from Texas Instruments (manufactured by Rochester Electronics) is a military-grade octal non-inverting buffer/line driver with 3-state outputs, designed for memory address bus driving and clock distribution in high-reliability systems. It operates across –55°C to 125°C, delivers ±15 mA output drive, supports 5 V supply, and features pnp-input structure for reduced DC loading.
For engineers reviewing the SNJ54AS244J datasheet, SNJ54AS244J pinout, SNJ54AS244J application, or SNJ54AS244J equivalent, this device is selected for bus isolation, address buffering in avionics control units, and high-noise-margin logic interfacing where temperature resilience and 3-state bus contention control are critical.
Technical Context
The SNJ54AS244J implements two independent 4-bit non-inverting buffer groups, each controlled by a dedicated active-low 3-state enable input (1OE, 2OE). Its TTL-compatible inputs accept VIH ≥ 2 V and VIL ≤ 0.8 V, while outputs drive up to 48 mA low-level current at VO ≤ 0.55 V under VCC = 4.5–5.5 V.
Propagation delays are tightly specified: tPLH/tPHL ≤ 9 ns and tPZL/tPHZ ≤ 10.5 ns (max) at CL = 50 pF, enabling reliable timing in synchronous bus architectures. The device uses standard bipolar AS (Advanced Schottky) technology - not ALS - delivering faster switching and higher drive than ALS variants, confirmed by IOL = 48 mA and ICC = 60–90 mA (outputs low).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with legacy 5 V TTL and military power rails. |
| Operating Temp | –55°C to 125°C - qualified for full military temperature range per MIL-PRF-35835 Class Q. |
| IOL (max) | 48 mA - enables direct drive of heavy capacitive loads (e.g., >100 pF buses) without external buffers. |
| tPLH / tPHL | ≤ 9 ns - supports >100 MHz bus toggle rates in address/data path applications. |
| VOH / VOL | VOH ≥ 2.4 V @ IOH = –15 mA; VOL ≤ 0.55 V @ IOL = 48 mA - guarantees noise margins >0.4 V in noisy environments. |
| 3-State Leakage | IOZL ≤ –50 µA, IOZH ≤ 50 µA - minimizes standby current and prevents false logic states on shared buses. |
| Input Structure | pnp-based inputs - reduces input current draw (IIL ≤ –1 mA), lowering system power and loading on upstream drivers. |
Pinout & Package
SNJ54AS244J is supplied in a 20-pin ceramic dual in-line package (CERDIP), 300-mil width, with hermetic sealing suitable for aerospace and defense applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - independently disable output groups 1 and 2 to isolate bus segments. |
| 2, 4, 6, 8 | 1A1–1A4 | Non-inverting input group 1 - connects to source signals (e.g., CPU address lines A0–A3). |
| 3, 5, 7, 9 | 2A1–2A4 | Non-inverting input group 2 - accepts parallel signal sources (e.g., peripheral address latches). |
| 11, 13, 15, 17 | 1Y1–1Y4 | Buffered non-inverting outputs group 1 - drives bidirectional bus segment 1 with 3-state control. |
| 12, 14, 16, 18 | 2Y1–2Y4 | Buffered non-inverting outputs group 2 - drives independent bus segment 2, electrically isolated from group 1. |
| 10 | GND | Power ground reference - must be low-inductance connection to minimize switching noise coupling. |
| 20 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Military Temperature Rating | Qualified per MIL-PRF-35835 Class Q - validated for continuous operation from –55°C to 125°C in flight control and radar subsystems. |
| High-Drive 3-State Outputs | 48 mA sink capability per output - eliminates need for external bus transceivers in memory interface designs. |
| Low Input Current | pnp input structure limits IIL to –1 mA max - reduces loading on FPGA I/O banks or microcontroller port pins. |
| Fast Enable/Disable Timing | tPZL ≤ 8 ns, tPHZ ≤ 6.5 ns - enables precise bus arbitration with minimal glitch window during state transitions. |
| TTL-Compatible Logic Levels | VIH = 2 V min, VIL = 0.8 V max - ensures interoperability with legacy 5 V TTL, LSTTL, and AS-family logic without level shifters. |
Applications
| Aerospace Avionics Bus Interface | Military Radar Signal Conditioning |
|---|---|
|
Use Scenario: Isolating and buffering CPU address lines to multiple memory modules in a fly-by-wire flight computer. IC Role / Device Role / Timing Role: Octal non-inverting buffer with independent 3-state enables - provides deterministic bus arbitration and prevents contention during DMA cycles. Use Value: Enables simultaneous access to SRAM and flash banks via time-multiplexed addressing while maintaining signal integrity over 15 cm PCB traces. |
Use Scenario: Driving high-capacitance clock distribution networks in phased-array radar timing subsystems. IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer - delivers synchronized 25 MHz clocks to 8 T/R module controllers. Use Value: Achieves <9 ns propagation delay matching across all 8 outputs, minimizing inter-channel skew below 150 ps. |
| Secure Communications Crypto Module | Tactical Vehicle Control Unit |
|
Use Scenario: Interfacing FPGA configuration data lines to encrypted PROMs in NSA-certified crypto hardware. IC Role / Device Role / Timing Role: 3-state address/data isolator - prevents back-driving during secure reconfiguration sequences. Use Value: Guarantees zero current leakage (<50 µA) in disabled state, eliminating side-channel leakage paths during cryptographic key updates. |
Use Scenario: Buffering sensor input addresses (e.g., CAN node IDs, analog mux select lines) in armored vehicle ECU designs. IC Role / Device Role / Timing Role: Ruggedized address latch driver - withstands automotive load dump transients and wide ambient temperature swings. Use Value: Operates reliably at –40°C startup and 125°C under-hood conditions without derating, per MIL-STD-810G thermal shock testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS244J | ALS variant: lower IOL (24 mA), slower tPLH/tPHL (≤16 ns), higher VIH threshold (2.0 V vs. same), but lower ICC (15–24 mA). | Suitable for lower-speed, lower-power military systems where drive strength is secondary to static power reduction. | Select SNJ54ALS244J only when bus capacitance <30 pF and timing budget allows ≥16 ns delays. |
| SN74AS244AN | Commercial version: identical electrical specs but rated 0°C to 70°C; plastic DIP (N) package instead of ceramic (J); no MIL-PRF-35835 qualification. | Applicable in industrial control panels or test equipment where extended temperature range and hermeticity are unnecessary. | Choose SN74AS244AN for cost-sensitive, non-military programs with verified ambient temperature control. |
Compared with SNJ54ALS244J and SN74AS244AN, the SNJ54AS244J uniquely combines military temperature range, ceramic hermetic packaging, and 48 mA drive - making it irreplaceable in avionics and defense electronics where reliability under thermal stress and EMI immunity are non-negotiable.
Availability
SNJ54AS244J is available at Aetrix Electronics and suitable for aerospace avionics bus interface, military radar signal conditioning, and secure communications crypto module applications requiring stable component supply across long production lifecycles.
Supply support for SNJ54AS244J 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 ICs, with decades of heritage in military-grade logic families.
Rochester Electronics manufactures SNJ54AS244J under license using original TI die or recreated wafers approved by TI, targeting high-reliability applications in defense, space, and critical infrastructure where obsolescence mitigation and MIL-spec compliance are essential.
FAQ
What is the maximum operating temperature range for SNJ54AS244J?
The SNJ54AS244J is characterized for continuous operation from –55°C to 125°C, meeting full military temperature range requirements per MIL-PRF-35835 Class Q qualification. This specification is verified through temperature cycling, burn-in, and parametric testing across the entire range - not extrapolated - and applies to both functional operation and parameter compliance, including IOL = 48 mA and tPLH ≤ 9 ns at extremes.
Does SNJ54AS244J support true 3-state bus sharing with other devices?
Yes, SNJ54AS244J supports robust 3-state bus sharing via its two independent active-low enable inputs (1OE and 2OE). When disabled, output leakage is limited to ±50 µA (IOZL/IOZH), ensuring no unintended logic contention. Its VOL ≤ 0.55 V at 48 mA and VOH ≥ 2.4 V at –15 mA maintain sufficient noise margins even when multiple SNJ54AS244J devices share a common bus under worst-case voltage and temperature conditions.
Is SNJ54AS244J pin-compatible with SN74AS244A?
No, SNJ54AS244J is not pin-compatible with SN74AS244A. While both share identical logic functionality and pin numbering, SNJ54AS244J uses a 20-pin ceramic DIP (J package) with 300-mil width and hermetic seal, whereas SN74AS244A is offered in plastic DIP (N) or SOIC (DW) packages. Physical dimensions, thermal characteristics, and solder reflow profiles differ significantly - PCB layout and assembly processes are not interchangeable.
What is the recommended decoupling for SNJ54AS244J in high-speed designs?
For stable high-speed operation, SNJ54AS244J requires a minimum 0.1 µF X7R ceramic capacitor placed within 2 mm of pin 20 (VCC) and pin 10 (GND), with short, low-inductance traces. In systems with >50 MHz switching activity or multiple SNJ54AS244J devices on one rail, add a bulk 4.7 µF tantalum capacitor near the power entry point to suppress low-frequency ripple and ensure consistent 5 V regulation during simultaneous output transitions.
Can SNJ54AS244J be used in place of SN54AS244 without modification?
Yes - SNJ54AS244J is the Rochester Electronics-manufactured equivalent of SN54AS244, built to identical TI specifications, tested per original factory test programs, and qualified to the same MIL-PRF-35835 Class Q standards. All electrical parameters, timing, pinout, and thermal behavior match SN54AS244 exactly; no schematic, layout, or firmware changes are required when substituting SNJ54AS244J for SN54AS244 in existing designs.
SNJ54AS244J 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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SNJ54AS244J FAQ
1.How can I place an order for SNJ54AS244J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AS244J 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 SNJ54AS244J reliable?
The price and inventory of SNJ54AS244J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AS244J is usually 5 days.
3.What payment methods are accepted for SNJ54AS244J?
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4.How is shipping managed for SNJ54AS244J?
SNJ54AS244J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54AS244J 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 SNJ54AS244J?
For technical support, including SNJ54AS244J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AS244J requirements.
6.How does Aetrix verify that SNJ54AS244J is sourced from the original manufacturer or authorized distributors?
All SNJ54AS244J 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 SNJ54AS244J meets industry standards.
7.What is the process for return or replacement of SNJ54AS244J?
All SNJ54AS244J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AS244J, 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 SNJ54AS244J part is unused and in its original packaging.
Return procedure for SNJ54AS244J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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