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Texas Instruments SN54LS137J
- Part No.:
- SN54LS137J
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN54LS137J.pdf
- Description:
- 54LS137 3-LINE TO 8-LINE DECODER
- Quantity:
- Payment:
- Shipping:
Inventory:232
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Product details
Overview
SN54LS137J from Texas Instruments is a 3-line-to-8-line decoder/demultiplexer with integrated address latches, designed for military-grade digital logic systems. It operates over -55°C to +125°C, features TTL-compatible inputs and outputs, supports active-low enable (G1̅, G2̅), and delivers typical propagation delay of 25 ns at VCC = 5 V.
For engineers reviewing the SN54LS137J datasheet, SN54LS137J pinout, SN54LS137J application, or SN54LS137J equivalent, this device is selected for high-reliability address decoding in avionics control units, radiation-tolerant test equipment, and legacy military data acquisition subsystems where latch-enabled decoding stability is required.
Technical Context
The SN54LS137J implements combinational decoding logic with three address inputs (A0–A2) and two active-low chip enables (G1̅, G2̅), where output selection occurs only when both enables are asserted. Its internal latches hold the address state independently of input transitions, eliminating glitches during address bus changes.
It uses bipolar TTL technology with Schottky-clamped transistors, ensuring compatibility with standard LS-TTL families. Output drive capability is rated at IOH = –0.4 mA and IOL = 8 mA, supporting direct fan-out to 10 LS-TTL loads without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures interoperability with 74LS series and backward compatibility with standard TTL. |
| Operating Temperature | –55°C to +125°C - qualified for extended military temperature range per MIL-PRF-38535. |
| Propagation Delay | 25 ns max (tPLH/tPHL) - enables reliable operation in synchronous systems up to ~20 MHz clock domains. |
| Supply Voltage | VCC = 4.5 V to 5.5 V - accommodates regulated 5 V rails with ±10% tolerance common in ruggedized power supplies. |
| Output Drive | IOL = 8 mA / IOH = –0.4 mA - sufficient to directly drive multiple LS-TTL inputs or small LED indicators without external buffers. |
| Enable Logic | Two active-low enables (G1̅, G2̅) - requires both low for decode activation, enabling hierarchical addressing in multi-chip systems. |
Pinout & Package
SN54LS137J is housed in a 16-pin Ceramic Dual-In-Line Package (CDIP) with hermetic sealing, designated TI package drawing J. This package provides mechanical robustness and thermal stability for high-reliability environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | A0, A1, A2 | Address inputs latched on rising edge of strobe (pin 15); define one of eight decoded outputs (Y0–Y7). |
| 4, 5 | G1̅, G2̅ | Active-low chip enables - both must be low for any output to be active; used for chip select hierarchy. |
| 6–13 | Y0–Y7 | Active-low decoded outputs - only one asserted low per valid address/enable combination; open-collector compatible. |
| 14 | VCC | Positive supply terminal - connected to +5 V rail; decoupling capacitor required near pin for noise immunity. |
| 15 | STROBE | Latch enable - rising edge captures A0–A2 values into internal latches; critical for glitch-free address sampling. |
| 16 | GND | Ground reference - must be low-impedance connection to minimize ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated address latches | Eliminates need for external latch ICs in address decoding paths, reducing component count and board space in compact military modules. |
| Double enable control (G1̅, G2̅) | Enables cascading of multiple SN54LS137J devices for larger address spaces (e.g., 4-to-16 or 5-to-32 decoding) without additional logic gates. |
| Military temperature range | Validated operation from –55°C to +125°C ensures functional reliability in airborne, missile, and ground vehicle electronics under extreme environmental stress. |
| TTL-compatible I/O | Direct interface with 74LS, 74S, and standard TTL families without level-shifting, simplifying integration into legacy digital systems. |
Applications
| Avionics Control Unit Address Decoding | Ground-Based Radar Signal Routing |
|---|---|
Use Scenario: Selecting discrete memory-mapped peripheral registers in a flight computer's I/O subsystem using a shared address/data bus. IC Role / Device Role / Timing Role: Latch-enabled decoder that stabilizes register selection during bus contention, preventing spurious writes during address transitions. Use Value: Eliminates timing-critical external latch design; reduces risk of metastability-induced command errors in real-time safety-critical functions. | Use Scenario: Routing analog-to-digital converter channel select lines in a multi-channel radar receiver front-end. IC Role / Device Role / Timing Role: Demultiplexer converting 3-bit digital control words into individual channel-enable signals for parallel ADCs. Use Value: Provides deterministic, glitch-free channel selection synchronized to system strobe, improving measurement repeatability across temperature extremes. |
| Missile Guidance System Test Equipment | Secure Communication Module Bootloader Interface |
Use Scenario: Emulating target hardware address maps during factory functional testing of guidance processors under environmental stress chambers. IC Role / Device Role / Timing Role: Address decoder generating stable chip-select signals for PROM, RAM, and I/O emulation banks during accelerated life testing. Use Value: Maintains decode integrity across –55°C to +125°C thermal cycles, enabling validation of firmware boot sequences under worst-case conditions. | Use Scenario: Enabling secure boot ROM access while disabling alternate flash banks during cryptographic key loading sequences. IC Role / Device Role / Timing Role: Security-enforced decoder that activates only when dual enables (G1̅, G2̅) and strobed address match pre-defined secure configuration. Use Value: Adds hardware-level gating to boot path selection, mitigating fault-injection attacks targeting unsecured memory regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN54LS138J | No internal latches; address inputs sampled combinatorially without strobe control. | Suitable for static address decoding but lacks glitch immunity during dynamic bus transitions. | Select SN54LS137J when strobe-synchronized latching is required; choose SN54LS138J for simpler, lower-cost non-latched decoding. |
| SNJ54LS137J | Identical electrical and functional specification; differs only in screening level (QML-38535 Class V vs Class B). | Used in higher-tier space-qualified systems requiring full QML certification and lot traceability. | SN54LS137J meets Class B requirements; SNJ54LS137J adds enhanced screening for mission-critical space platforms. |
Compared with SN54LS137J, SN54LS138J removes latch functionality-reducing latency but increasing susceptibility to address bus glitches-while SNJ54LS137J retains identical behavior with stricter process controls and documentation for aerospace deployment.
Availability
SN54LS137J is available at Aetrix Electronics and suitable for avionics control units, ground-based radar signal routing, and missile guidance system test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN54LS137J 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 products for industrial, aerospace, and defense markets.
The SN54LS137J belongs to TI's military-grade 54LS logic family, developed to deliver robust, temperature-stable decoding in mission-critical systems where failure is not an option.
FAQ
What is the function of the STROBE pin on the SN54LS137J?
The STROBE pin (pin 15) on the SN54LS137J triggers the internal address latches on its rising edge, capturing and holding the current A0–A2 input states. This ensures stable output selection even if address lines change after latching. Unlike combinatorial decoders, the SN54LS137J relies on this strobe to eliminate decoding glitches-making it essential for use in synchronous bus architectures where SN54LS137J is deployed.
Does the SN54LS137J support open-collector outputs?
No, the SN54LS137J features standard TTL totem-pole outputs-not open-collector. Its Y0–Y7 outputs actively drive both high and low states, with IOH = –0.4 mA and IOL = 8 mA. While this limits wired-OR capability, it provides stronger high-side drive than open-collector variants. Designers using SN54LS137J must plan for conventional fan-out and avoid direct output tying unless buffered.
How does the SN54LS137J differ from the SN74LS137 in terms of temperature range and application?
The SN54LS137J is specified for –55°C to +125°C and qualified to MIL-PRF-38535 Class B, making it suitable for military and aerospace applications. In contrast, the SN74LS137 operates from 0°C to +70°C and targets commercial systems. Both share identical logic functionality, but SN54LS137J's extended range and screening make it the only choice where SN54LS137J is mandated by environmental or qualification requirements.
Can the SN54LS137J be used as a demultiplexer?
Yes-the SN54LS137J functions as a 1-to-8 demultiplexer when the data input is applied to one enable pin (e.g., G2̅) and address bits A0–A2 select the active output line. Its active-low outputs and dual enable structure allow flexible reconfiguration. In demux mode, SN54LS137J maintains latch synchronization, providing cleaner signal routing than non-latched alternatives in time-sensitive applications.
Is there a RoHS-compliant version of the SN54LS137J available?
No RoHS-compliant variant of the SN54LS137J is offered by Texas Instruments. The SN54LS137J uses a ceramic DIP (CDIP) package with leaded solder finish and is exempt from RoHS due to its military specification status and hermetic packaging requirements. For RoHS-compliant designs, engineers must consider modern replacements or redesign with surface-mount alternatives-SN54LS137J remains a legacy through-hole part for systems where compliance is waived per application standards.
SN54LS137J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54LS
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 400µA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
SN54LS137J FAQ
1.How can I place an order for SN54LS137J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54LS137J 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 SN54LS137J reliable?
The price and inventory of SN54LS137J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54LS137J is usually 5 days.
3.What payment methods are accepted for SN54LS137J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54LS137J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54LS137J?
SN54LS137J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54LS137J 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 SN54LS137J?
For technical support, including SN54LS137J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54LS137J requirements.
6.How does Aetrix verify that SN54LS137J is sourced from the original manufacturer or authorized distributors?
All SN54LS137J 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 SN54LS137J meets industry standards.
7.What is the process for return or replacement of SN54LS137J?
All SN54LS137J units undergo pre-shipment inspection (PSI). If there is an issue with SN54LS137J, 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 SN54LS137J part is unused and in its original packaging.
Return procedure for SN54LS137J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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