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Texas Instruments SN54ALS652JT
- Part No.:
- SN54ALS652JT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN54ALS652JT.pdf
- Description:
- 54ALS652 OCTAL BUS TRANSCEIVERS
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Inventory:1,016
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Product details
Overview
SN54ALS652JT from Texas Instruments is a military-grade octal bus transceiver and register with true (non-inverting) data path, 3-state outputs on both A and B buses, and independent clock, select, and output-enable controls. It operates from –55°C to 125°C, supports up to 35 MHz clock frequency, and features real-time/stored data multiplexing for bidirectional bus management in legacy TTL systems.
For engineers reviewing the SN54ALS652JT datasheet, SN54ALS652JT pinout, SN54ALS652JT application, or SN54ALS652JT equivalent, this device is selected for high-reliability 5 V TTL bus isolation, synchronous data latching across dual buses, and glitch-free mode switching between live and registered data paths in aerospace and industrial control backplanes.
Technical Context
The SN54ALS652JT integrates eight D-type flip-flops per bus, dual independent clocks (CLKAB/CLKBA), dual select controls (SAB/SBA), and dual 3-state enables (OEAB/OEBA) to support four fundamental bus operations: real-time A↔B transfer, stored A↔B transfer, simultaneous A/B storage, and isolated bus hold. Its internal logic eliminates decoding glitches during SAB/SBA transitions.
It implements true (non-inverting) data flow-unlike SN54ALS651 variants-and uses standard ALS TTL input thresholds (VIL = 0.7 V, VIH = 2 V) with guaranteed 12 mA low-level output drive (IOL) and –12 mA high-level drive (IOH) across its full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal bus transceiver + dual-register with true (non-inverting) data path |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL rails; no regulation required |
| Operating Temperature | –55°C to +125°C - qualified for military/aerospace environments per SN54 prefix |
| Max Clock Frequency | 35 MHz - supports high-speed synchronous bus arbitration in real-time control systems |
| IOL / IOH | 12 mA / –12 mA - sufficient to drive standard TTL loads without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 35 ns (CLK→bus), ≤ 20 ns (OE→output) - ensures timing closure in 25 ns cycle designs |
| Package | CDIP-24 (JT) - hermetically sealed ceramic DIP for high-reliability, high-temperature PCB mounting |
Pinout & Package
SN54ALS652JT is housed in a 24-pin Ceramic Dual In-line Package (CDIP), designated JT by Texas Instruments. The package provides hermetic sealing, MIL-STD-883 compliance, and thermal robustness for extended operation at 125°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | VCC / GND | Power supply and ground reference - decoupling capacitor placement critical for noise immunity |
| 2, 23 | CLKBA / CLKAB | Asynchronous clocks - low-to-high edge captures data from B→A or A→B buses into registers |
| 3, 22 | OEBA / OEAB | 3-state output enables - active-low control of B→A and A→B bus drivers independently |
| 4–11, 13–20 | A1–A8 / B1–B8 | Bidirectional I/O ports - connect directly to system address/data buses; no direction pin required |
| 12, 14 | SBA / SAB | Select controls - high selects stored data, low selects real-time bus pass-through (glitch-free transition) |
| 15–21 | NC | No internal connection - must remain unconnected; not tied to VCC/GND |
Key Features
| Feature | Design Value |
|---|---|
| True (non-inverting) data path | Preserves signal polarity across A↔B transfer - eliminates need for external inverters in symmetric bus architectures |
| Dual independent register clocks | Enables asynchronous capture of A and B bus data - supports staggered loading when SAB/SBA = H |
| Glitch-free select control | SAB/SBA transitions do not corrupt bus states - critical for deterministic real-time system behavior |
| Real-time + stored data multiplexing | Four distinct bus-management modes implemented in single IC - reduces board space vs discrete solutions |
| Military temperature qualification | Validated operation from –55°C to +125°C - meets MIL-PRF-38535 Class B requirements |
Applications
| Aerospace Avionics Backplane | Industrial PLC I/O Module |
|---|---|
Use Scenario: Bidirectional data routing between flight computer and sensor acquisition subsystems under extreme thermal cycling. IC Role / Device Role / Timing Role: Bus transceiver and register managing time-critical telemetry streams while maintaining deterministic latency via stored-data mode. Use Value: Eliminates bus contention during CPU interrupt servicing by holding prior state on both buses during register reload. | Use Scenario: Isolating programmable logic controller CPU bus from field I/O expansion racks with hot-swap capability. IC Role / Device Role / Timing Role: Synchronous interface providing glitch-free handshaking between CPU and modular I/O cards using shared address/data lines. Use Value: Enables safe insertion/removal of I/O modules without disrupting active bus traffic via OEAB/OEBA-controlled 3-state isolation. |
| Military Communications Chassis | Legacy Test Equipment Controller |
Use Scenario: Interfacing encrypted radio baseband processors with analog front-end FPGAs in secure comms hardware. IC Role / Device Role / Timing Role: Dual-bus register synchronizing parallel data transfers between encryption ASIC and RF modulator under strict timing budgets. Use Value: Achieves sub-35 ns clock-to-output delay for deterministic frame alignment across multiple processing stages. | Use Scenario: Replacing obsolete TTL bus controllers in automated test equipment requiring long-term component availability. IC Role / Device Role / Timing Role: Pin-compatible upgrade path for SN54LS652-based designs needing improved speed and drive strength. Use Value: Maintains identical footprint and logic behavior while delivering 35 MHz operation vs original 25 MHz LS version. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS652A | Commercial temperature range (0°C to 70°C); same pinout, timing, and logic; 40 MHz max clock vs 35 MHz | Not rated for –55°C operation or MIL-STD-883 screening; unsuitable for aerospace deployment | Select when cost-sensitive commercial systems require higher clock margin and relaxed environmental specs |
| SN54AS652 | Faster AS-family propagation (≤20 ns CLK→bus); higher IOL (32 mA); same JT package and military temp range | Higher power consumption (ICC up to 185 mA vs 88 mA); requires tighter thermal design | Select for ultra-low-latency deterministic control loops where speed outweighs power budget constraints |
Compared with SN74ALS652A and SN54AS652, the SN54ALS652JT delivers optimal balance of military reliability, proven ALS noise immunity, and moderate power/performance - making it the preferred choice for sustainment of legacy high-integrity systems where long-term obsolescence resistance is critical.
Availability
SN54ALS652JT is available at Aetrix Electronics and suitable for aerospace avionics backplanes, industrial PLC I/O modules, and military communications chassis requiring stable component supply across extended product lifecycles.
Supply support for SN54ALS652JT 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 devices with over 50 years of military-grade component heritage.
The SN54ALS652JT belongs to TI's legacy ALS TTL logic family, designed specifically for high-reliability, high-noise-immunity digital interfacing in defense, aerospace, and industrial control systems where long-term availability and MIL-qualified operation are mandatory.
FAQ
What is the maximum clock frequency supported by SN54ALS652JT?
The SN54ALS652JT supports a maximum clock frequency of 35 MHz across its full operating temperature range of –55°C to +125°C. This value is specified in the recommended operating conditions table of the SDAS066G datasheet and validated under CL = 50 pF load conditions. Exceeding this frequency may result in setup/hold violations or metastability in the internal D-type registers.
Does SN54ALS652JT support both real-time and stored data transfer modes?
Yes, SN54ALS652JT supports both real-time and stored data transfer via dedicated SAB and SBA select inputs. When SAB/SBA = L, data passes directly between A and B buses; when SAB/SBA = H, data from internal registers is driven onto the buses. The circuitry eliminates decoding glitches during mode transitions, ensuring deterministic behavior in safety-critical applications.
Is SN54ALS652JT pin-compatible with SN54LS652?
Yes, SN54ALS652JT is pin-compatible and functionally equivalent to SN54LS652, retaining identical JT-package pinout, terminal functions, and truth table behavior. However, SN54ALS652JT offers improved speed (35 MHz vs 25 MHz), lower power (ICC ≈ 88 mA vs ~120 mA), and enhanced noise immunity due to ALS Schottky-clamped TTL architecture.
What are the absolute maximum ratings for SN54ALS652JT?
The absolute maximum ratings for SN54ALS652JT are: supply voltage VCC = –0.5 V to 7 V; input voltage VI = –0.5 V to 7 V on control pins, –0.5 V to 5.5 V on I/O ports; storage temperature Tstg = –65°C to +150°C. These stress limits must not be exceeded during operation or handling, as permanent device damage may occur even if functional operation appears normal.
Can SN54ALS652JT drive standard TTL loads without external buffers?
Yes, SN54ALS652JT can directly drive standard TTL loads: its guaranteed IOL = 12 mA and IOH = –12 mA meet or exceed the input current requirements of legacy 74LS and 74ALS devices. This eliminates the need for external bus drivers in most backplane and motherboard applications, simplifying layout and reducing BOM count.
SN54ALS652JT 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:
- -
SN54ALS652JT FAQ
1.How can I place an order for SN54ALS652JT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54ALS652JT 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 SN54ALS652JT reliable?
The price and inventory of SN54ALS652JT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54ALS652JT is usually 5 days.
3.What payment methods are accepted for SN54ALS652JT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54ALS652JT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54ALS652JT?
SN54ALS652JT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54ALS652JT 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 SN54ALS652JT?
For technical support, including SN54ALS652JT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54ALS652JT requirements.
6.How does Aetrix verify that SN54ALS652JT is sourced from the original manufacturer or authorized distributors?
All SN54ALS652JT 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 SN54ALS652JT meets industry standards.
7.What is the process for return or replacement of SN54ALS652JT?
All SN54ALS652JT units undergo pre-shipment inspection (PSI). If there is an issue with SN54ALS652JT, 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 SN54ALS652JT part is unused and in its original packaging.
Return procedure for SN54ALS652JT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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