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Texas Instruments SN54ALS273J
- Part No.:
- SN54ALS273J
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN54ALS273J.pdf
- Description:
- 54ALS273 OCTAL D-TYPE FLIP-FLOPS
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Product details
Overview
SN54ALS273J from Texas Instruments is a military-grade octal positive-edge-triggered D-type flip-flop with asynchronous direct-clear (CLR), implemented in ALS TTL logic. It features eight independent D inputs, single-rail buffered Q outputs, and operates across –55°C to 125°C. Key specs include 30 MHz max clock frequency, 12 mA low-level output drive, and 24 ns max tPLH propagation delay - used in military-grade buffer/register applications requiring high noise immunity and temperature resilience.
For engineers reviewing the SN54ALS273J datasheet, SN54ALS273J pinout, SN54ALS273J application, or SN54ALS273J equivalent, this page delivers verified functional identity, military-temperature-rated timing behavior, TTL-compatible input/output thresholds, CDIP-20 package mapping, and validated alternatives for legacy system sustainment and replacement design.
Technical Context
The SN54ALS273J implements eight identical edge-triggered D-type latches sharing a common buffered clock (CLK) and active-low direct-clear (CLR) input. Each flip-flop transfers data from its D input to Q output on the positive-going transition of CLK, provided setup (10 ns) and hold (0 ns) timing requirements are met. CLR overrides clock and forces all Q outputs low asynchronously.
It uses bipolar ALS (Advanced Low-Power Schottky) TTL circuitry, delivering higher speed and lower power than standard LS TTL while maintaining full TTL voltage compatibility. Input thresholds (VIH = 2 V min, VIL = 0.7 V max) and output drive (IOL = 12 mA, IOH = –1 mA) are specified over the full –55°C to 125°C range, ensuring deterministic operation in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS TTL - enables interoperability with legacy 5 V TTL systems without level-shifting |
| Operating Temperature | –55°C to 125°C - qualified for military/aerospace platforms requiring extended thermal margin |
| Max Clock Frequency | 30 MHz - supports high-speed synchronous data capture in register files and pattern generators |
| Output Drive (IOL) | 12 mA - sufficient to drive multiple TTL loads or interface directly to 74-series logic without buffers |
| Propagation Delay (tPLH) | 2–12 ns - ensures tight timing control in pipeline stages and state-machine clock domains |
| Supply Voltage Range | 4.5 V to 5.5 V - accommodates nominal 5 V rails with ±10% tolerance and ripple |
| Input Setup Time (tsu) | 10 ns - defines minimum data stability window before CLK edge for reliable sampling |
Pinout & Package
SN54ALS273J is supplied in a 20-pin Ceramic Dual-In-Line Package (CDIP, J package), hermetically sealed for high-reliability military use. Pin spacing is 0.1 inch (2.54 mm), body width 0.3 inches (7.62 mm), and height ≤ 0.225 inches (5.72 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Active-low asynchronous clear - forces all Q outputs low regardless of CLK state |
| 2–9 | 1D–8D | Independent data inputs - each controls corresponding flip-flop's next-state value |
| 10 | GND | Ground reference - must be connected to system ground plane for stable noise margin |
| 11–18 | 1Q–8Q | Non-inverted registered outputs - provide synchronized, glitch-free storage of sampled data |
| 19 | CLK | Buffered positive-edge clock - triggers simultaneous latching across all eight flip-flops |
| 20 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type architecture | Enables compact implementation of 8-bit registers or shift-register stages without external gating |
| Direct-clear (CLR) input | Allows system-wide reset of all stored bits in one cycle - critical for initialization and fault recovery |
| ALS TTL process | Delivers 30 MHz operation at ~20 mA ICC typical - 3× faster than standard LS with comparable power |
| Single-rail outputs | Eliminates need for external inverters when driving complementary logic or bus drivers |
| Military temperature qualification | Validated operation across –55°C to 125°C - meets MIL-PRF-38535 Class B screening requirements |
Applications
| Buffer/Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding parallel data between processor bus cycles in avionics mission computers. IC Role / Device Role / Timing Role: Synchronizes and isolates 8-bit data paths using edge-triggered storage with guaranteed setup/hold margins. Use Value: Prevents metastability and bus contention during multi-cycle memory read/write sequences under wide temperature swings. |
Use Scenario: Serial-to-parallel conversion in radar pulse timing generators. IC Role / Device Role / Timing Role: Forms one stage of an 8-bit shift register chain, clocked by precision timing pulses. Use Value: Delivers deterministic 2–12 ns propagation delay per stage, enabling sub-33 ns bit-period resolution. |
| Pattern Generators | Military Data Acquisition Systems |
Use Scenario: Generating fixed test vectors for BIT (Built-In Test) routines in flight control hardware. IC Role / Device Role / Timing Role: Stores and repeats predefined 8-bit stimulus patterns synchronized to system clock. Use Value: Direct-clear allows instant pattern reset between test phases; ALS speed supports >10 MHz pattern rates. |
Use Scenario: Capturing sensor samples in hardened telemetry modules deployed in jet engine bays. IC Role / Device Role / Timing Role: Latches analog-to-digital converter outputs under precise clock edges in extreme thermal environments. Use Value: Guaranteed functionality at –55°C and 125°C eliminates need for derating or thermal compensation circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54ALS273J | Identical electrical and thermal specs; differs only in TI's internal part numbering convention (SNJ prefix denotes QML-qualified variant) | Same military application scope; approved for spaceflight use under QML Class V | Select SNJ54ALS273J when QML-38535 Class V certification documentation and traceability are contractually required. |
| SN54LS273J | Lower max clock frequency (30 MHz → 25 MHz); higher ICC (29 mA vs 20 mA); looser timing margins (tPLH up to 25 ns) | Suitable for cost-sensitive legacy systems where speed headroom is available and power budget permits | Choose SN54LS273J only if existing board layout and timing analysis confirm compatibility with reduced performance envelope. |
Compared with SN54ALS273J, SNJ54ALS273J adds formal QML-38535 qualification evidence but no functional change, while SN54LS273J trades speed and power efficiency for broader second-source availability in non-mission-critical designs.
Availability
SN54ALS273J is available at Aetrix Electronics and suitable for military avionics, aerospace telemetry, and defense electronics requiring stable component supply, long-term obsolescence management, and certified traceability.
Supply support for SN54ALS273J 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 for industrial, automotive, and defense markets.
The SN54ALS273J belongs to TI's military-grade ALS TTL logic family, designed specifically for legacy system sustainment, radiation-tolerant upgrades, and applications demanding guaranteed operation across extreme temperature ranges without derating.
FAQ
What is the maximum operating frequency of the SN54ALS273J?
The SN54ALS273J is rated for a maximum clock frequency of 30 MHz across its full –55°C to 125°C operating range. This specification is verified under recommended conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω) and reflects worst-case timing across temperature and voltage extremes. The SN54ALS273J achieves this speed using ALS TTL technology, which improves upon standard LS TTL without sacrificing DC compatibility.
Does the SN54ALS273J support hot-swap or live-insertion?
No, the SN54ALS273J does not support hot-swap or live-insertion. Its CDIP-20 package and bipolar ALS TTL architecture lack bus-hold, power-up reset, or Ioff protection features. Applying VCC or signals before establishing proper grounding may cause latch-up or parametric shift. System-level hot-swap capability requires external circuitry such as power sequencing controllers and series current-limiting resistors - the SN54ALS273J itself provides no intrinsic protection.
Can the SN54ALS273J be used as a drop-in replacement for the SN74ALS273N?
No - the SN54ALS273J is not a drop-in replacement for the SN74ALS273N. While functionally identical, they differ in temperature rating (–55°C to 125°C vs 0°C to 70°C), packaging (ceramic DIP vs plastic DIP), and qualification level (military vs commercial). PCB footprints may match mechanically, but thermal validation, reliability testing, and supply-chain traceability requirements are distinct. Substitution requires full requalification per application environment.
What are the absolute maximum ratings for the SN54ALS273J?
The absolute maximum ratings for the SN54ALS273J are: supply voltage (VCC) up to 7 V, input voltage (VI) up to 7 V, and storage temperature from –65°C to 150°C. Exceeding these limits - even momentarily - risks permanent damage. These are stress ratings only; functional operation is guaranteed only within the recommended operating conditions (VCC = 4.5–5.5 V, TA = –55°C to 125°C). The SN54ALS273J must never be operated outside its specified voltage or thermal boundaries.
Is the SN54ALS273J RoHS compliant?
The SN54ALS273J is not RoHS compliant. As a legacy military-grade CDIP device manufactured prior to RoHS enforcement, it contains lead in both the solder seal and lead finish. TI's packaging addendum confirms "Call TI" for lead/ball finish details and "N/A for Pkg Type" for MSL rating - consistent with hermetic ceramic packages exempt from JEDEC moisture sensitivity classification. For RoHS-compliant alternatives, consider modern 74LVC or 74AUP series, though functional and timing equivalence requires redesign.
SN54ALS273J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
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- Grade:
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- Qualification:
- -
- Mounting Type:
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- Supplier Device Package:
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SN54ALS273J FAQ
1.How can I place an order for SN54ALS273J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54ALS273J 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 SN54ALS273J reliable?
The price and inventory of SN54ALS273J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54ALS273J is usually 5 days.
3.What payment methods are accepted for SN54ALS273J?
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4.How is shipping managed for SN54ALS273J?
SN54ALS273J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54ALS273J 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 SN54ALS273J?
For technical support, including SN54ALS273J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54ALS273J requirements.
6.How does Aetrix verify that SN54ALS273J is sourced from the original manufacturer or authorized distributors?
All SN54ALS273J 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 SN54ALS273J meets industry standards.
7.What is the process for return or replacement of SN54ALS273J?
All SN54ALS273J units undergo pre-shipment inspection (PSI). If there is an issue with SN54ALS273J, 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 SN54ALS273J part is unused and in its original packaging.
Return procedure for SN54ALS273J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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