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Texas Instruments SNJ54ALS244CJ
- Part No.:
- SNJ54ALS244CJ
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SNJ54ALS244CJ.pdf
- Description:
- 54ALS244 OCTAL BUFFERS AND LINE
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Product details
Overview
SNJ54ALS244CJ from Texas Instruments is a military-grade octal buffer and 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, features pnp inputs to reduce DC loading, supports 5 V supply (4.5–5.5 V), delivers ±12 mA output drive, and exhibits 1–16 ns propagation delay under 50 pF load.
For engineers reviewing the SNJ54ALS244CJ datasheet, SNJ54ALS244CJ pinout, SNJ54ALS244CJ application, or SNJ54ALS244CJ equivalent, this page provides verified functional specifications, military-temperature validated timing behavior, ceramic DIP package details, and direct alternatives for legacy bus interface design.
Technical Context
The SNJ54ALS244CJ implements two independent 4-bit non-inverting buffers, each with active-low 3-state enable (1OE, 2OE). Its TTL-compatible inputs use pnp structures to minimize input current draw, while its totem-pole outputs support bidirectional bus control via high-impedance state activation.
It belongs to the ALS (Advanced Low-Power Schottky) logic family, offering lower power than standard LS while maintaining compatible voltage thresholds and speed. The device lacks internal clamping diodes on outputs, requiring external protection when interfacing with higher-voltage buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Operates within standard 5 V TTL rail with ±10% tolerance; not rated for 3.3 V operation. |
| Operating Temperature | –55°C to 125°C - Qualified for full military temperature range; suitable for avionics, ground vehicle, and space-qualified subsystems. |
| Output Drive (IOL) | 12 mA - Sustains reliable low-level drive into 50 Ω transmission lines or multiple TTL loads without exceeding VOL ≤ 0.4 V. |
| Propagation Delay (tPLH/tPHL) | 1–16 ns - Measured at VCC = 4.5–5.5 V, CL = 50 pF; enables sub-60 MHz bus operation with deterministic timing margins. |
| 3-State Enable Time (tPZL) | 1–24 ns - Fast disable response ensures clean bus release before next driver activation; critical for time-multiplexed address/data buses. |
| Input Loading (IIH/IIL) | ±0.1 mA max - PNP input structure reduces DC loading by >70% vs. standard TTL, easing fanout in dense memory address decoding. |
| Package Type | Ceramic Dual-In-Line (CDIP, J package) - Hermetically sealed 20-pin ceramic DIP with 300-mil width; MIL-STD-883 qualified. |
Pinout & Package
Ceramic Dual-In-Line (CDIP) package, 20-pin, 300-mil width, hermetic seal, lead finish: SNPB (tin-lead), RoHS exemption status confirmed per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 6, 8, 11, 13, 15, 17, 19 | Input (A1–A4, Y1–Y4, OE1, OE2) | Non-inverting data inputs (1A1–1A4, 2A1–2A4) and active-low output enables (1OE, 2OE); TTL-compatible thresholds. |
| 3, 5, 7, 9, 12, 14, 16, 18 | Output (Y1–Y4, A1–A4) | 3-state buffered outputs (1Y1–1Y4, 2Y1–2Y4); high-impedance state activated when respective OE is HIGH. |
| 10 | GND | Signal reference ground; requires low-inductance connection to minimize switching noise coupling into logic paths. |
| 20 | VCC | +5 V power supply; decoupling capacitor (0.1 µF ceramic) required within 1 cm of pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Enables direct connection to shared memory or address buses without external bus transceivers; eliminates contention during multi-driver arbitration. |
| pnp Input Structure | Reduces input current to ±0.1 mA, allowing ≥20-unit fanout into standard TTL loads-critical for wide address register buffering. |
| Military Temperature Range | Validated operation from –55°C to 125°C per MIL-PRF-38535; eliminates derating calculations for harsh-environment deployments. |
| Ceramic DIP (J) Package | Hermetic sealing and CTE-matched ceramic body ensure long-term reliability in thermal cycling environments (e.g., aerospace launch/landing). |
| ALS Logic Family | Delivers 2× speed vs. LS at comparable power; tPHL/tPLH ≤ 12 ns typical at 5 V/25°C enables tighter setup/hold timing in synchronous systems. |
Applications
| Memory Address Buffering | Legacy Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microprocessor to multiple memory ICs in a radiation-tolerant flight computer. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing level-shifted, fanout-expanded address signals with simultaneous 3-state control per nibble group. Use Value: Eliminates need for discrete transistor arrays; pnp inputs reduce loading on address latch outputs, preserving timing margins under worst-case temperature. |
Use Scenario: Interfacing MIL-STD-1553B remote terminal logic with backplane data bus in armored vehicle control system. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling time-multiplexed command/data transfer between protocol controller and shared bus segment. Use Value: Sub-10 ns enable/disable times prevent bus contention during arbitration; ceramic package withstands vibration and thermal shock in mobile platforms. |
| High-Reliability Clock Distribution | Test Equipment Signal Conditioning |
|
Use Scenario: Distributing synchronized 10 MHz clock to eight analog-to-digital converter modules in a ground-based radar signal processor. IC Role / Device Role / Timing Role: Low-skew buffer replicating clock edge with matched propagation delay across all eight outputs. Use Value: Guaranteed tPLH/tPHL matching ≤ 3 ns (max) ensures <100 ps inter-channel skew-critical for coherent sampling across ADC array. |
Use Scenario: Level-shifting and isolating digital control signals from automated test equipment (ATE) fixture to DUT under extreme ambient conditions. IC Role / Device Role / Timing Role: Robust interface buffer protecting ATE logic from DUT ESD events and ground bounce during high-speed pattern generation. Use Value: Absolute maximum VI = 7 V and disabled-output voltage rating of 5.5 V allow safe operation even during DUT fault conditions. |
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 |
|---|---|---|---|
| SNJ54AS244AJ | AS family: higher speed (tPHL ≤ 7 ns), higher IOL (48 mA), but increased ICC (60 mA active vs. 25 mA for ALS). | Preferred where bus capacitance exceeds 50 pF or faster settling (<8 ns) is required; less suitable for low-power standby modes. | Select SNJ54AS244AJ only if timing budget demands sub-8 ns propagation and board-level power budget permits +140% active current. |
| SN54ALS244CJ | Identical electrical specs and pinout; differs only in part marking and qualification documentation-same die, same ceramic DIP package. | No functional difference; SN54ALS244CJ is commercial-military dual-marked variant with identical performance and reliability data. | SN54ALS244CJ may be sourced interchangeably where procurement channels prefer non-JAN prefix; no redesign or requalification needed. |
Compared with SNJ54ALS244CJ, SNJ54AS244AJ trades higher power for faster switching in high-capacitance buses, while SN54ALS244CJ offers identical functionality with alternate military documentation-enabling flexible sourcing without layout or timing impact.
Availability
SNJ54ALS244CJ is available at Aetrix Electronics and suitable for avionics subsystems, defense electronics, and industrial control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SNJ54ALS244CJ 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 with over 50 years of aerospace and defense component heritage.
The SNJ54ALS244CJ belongs to TI's military-qualified ALS logic family, engineered for robust bus interfacing in mission-critical systems where temperature resilience, long-term availability, and MIL-STD-883 compliance are mandatory.
FAQ
What is the maximum operating voltage for SNJ54ALS244CJ?
The absolute maximum supply voltage for SNJ54ALS244CJ is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this window risks parametric shift or accelerated wear; sustained 5.5 V is acceptable, but 6 V or higher violates TI's recommended conditions and voids guaranteed performance specs.
Does SNJ54ALS244CJ support 3.3 V logic interfaces?
No, SNJ54ALS244CJ is not 3.3 V compatible. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output VOH/VOL specs assume a 5 V supply. Driving it from 3.3 V CMOS outputs may result in marginal or failed recognition of HIGH inputs; level-shifting circuitry is required for mixed-voltage systems.
Is SNJ54ALS244CJ pin-compatible with SN74ALS244CN?
Yes, SNJ54ALS244CJ and SN74ALS244CN share identical pinout and logic function, but differ in temperature range (–55°C to 125°C vs. 0°C to 70°C) and package (ceramic DIP vs. plastic DIP). PCB layout is interchangeable, though thermal and reliability validation must reflect the intended operating environment.
What is the purpose of the pnp input structure in SNJ54ALS244CJ?
The pnp input structure in SNJ54ALS244CJ reduces input current to ±0.1 mA maximum-less than 30% of standard TTL input loading. This allows one SNJ54ALS244CJ output to drive ≥20 inputs of similar ALS devices, significantly easing fanout constraints in large memory decode trees or address multiplexers.
Can SNJ54ALS244CJ outputs be shorted together in wired-OR configuration?
No-SNJ54ALS244CJ outputs are totem-pole, not open-collector. Direct paralleling of outputs risks destructive current flow during state mismatches. Wired-OR requires external pull-up resistors and open-collector/drain devices; for bus arbitration, use 3-state enables (1OE/2OE) to isolate drivers instead.
SNJ54ALS244CJ 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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SNJ54ALS244CJ FAQ
1.How can I place an order for SNJ54ALS244CJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS244CJ 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 SNJ54ALS244CJ reliable?
The price and inventory of SNJ54ALS244CJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54ALS244CJ is usually 5 days.
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SNJ54ALS244CJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54ALS244CJ 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 SNJ54ALS244CJ?
For technical support, including SNJ54ALS244CJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54ALS244CJ requirements.
6.How does Aetrix verify that SNJ54ALS244CJ is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS244CJ 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 SNJ54ALS244CJ meets industry standards.
7.What is the process for return or replacement of SNJ54ALS244CJ?
All SNJ54ALS244CJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS244CJ, 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 SNJ54ALS244CJ part is unused and in its original packaging.
Return procedure for SNJ54ALS244CJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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