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Texas Instruments SN74ALS654-1DW
- Part No.:
- SN74ALS654-1DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS654-1DW.pdf
- Description:
- BUS TRANSCEIVER, ALS SERIES
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Inventory:157
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Product details
Overview
SN74ALS654-1DW from Texas Instruments is an octal bus transceiver and register IC with true data path, open-collector outputs on the A bus, 3-state outputs on the B bus, and independent clock, select, and output-enable controls for bidirectional multiplexed data flow. It operates from 4.5 V to 5.5 V, supports up to 35 MHz clock frequency, and is rated for 0°C to 70°C industrial temperature range in a 24-pin SOIC (DW) package.
For engineers reviewing the SN74ALS654-1DW datasheet, SN74ALS654-1DW pinout, SN74ALS654-1DW application, or SN74ALS654-1DW equivalent, this device enables real-time or stored data routing between two 8-bit buses with glitch-free select control, precise timing margins (10 ns setup, 0 ns hold), and robust drive capability (24 mA IOL on B bus).
Technical Context
The SN74ALS654-1DW integrates eight D-type flip-flops, dual bus transceiver logic, and independent SAB/SBA select controls that eliminate decoding glitches during real-time ↔ stored data transitions. Its open-collector A outputs support wired-AND configurations and level translation, while B outputs use 3-state drivers for standard TTL/LS bus loading.
It features separate CLKAB/CLKBA clocks for A→B and B→A storage, OEAB/OEBA enables for directional output control, and simultaneous real-time transfer + storage via concurrent OEAB/OEBA assertion - enabling bus reinforcement without register latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal bus transceiver/register with true data path and mixed-output topology (A: open-collector, B: 3-state) |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/LS systems; no external regulation required |
| Max Clock Frequency | 35 MHz - supports high-speed synchronous bus arbitration in legacy computing and industrial control backplanes |
| IOL (B bus) | 24 mA - drives standard LS-TTL loads (up to 20 units) without external buffers |
| Setup/Hold Time | 10 ns / 0 ns - enables tight-tolerance timing closure with minimal margin overhead in synchronous designs |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial embedded applications, not extended/military grade |
| Package | 24-pin SOIC (DW) - surface-mount compatible with automated PCB assembly; 300-mil width, JEDEC MS-013 compliant |
Pinout & Package
SN74ALS654-1DW uses a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), 300-mil body width, with standard pin spacing and thermal profile for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKBA | Clock input for storing data from B bus into internal registers (↑ edge triggers) |
| 2 | SBA | Select control for B→A transfer: low = real-time, high = stored data |
| 3 | OEBA | Output enable for B→A transceiver: low = active, high = 3-state (B bus drivers disabled) |
| 4–11 | A1–A8 | Open-collector outputs/data inputs on A bus - require external pull-up for logic HIGH |
| 12 | GND | Ground reference for all internal circuitry and I/O |
| 13 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor required at pin |
| 14–21 | B1–B8 | 3-state bidirectional I/O ports on B bus - driven by internal registers or passed through in real-time mode |
| 22 | OEAB | Output enable for A←B transceiver: low = active (A outputs enabled), high = high-impedance |
| 23 | SAB | Select control for A→B transfer: low = real-time, high = stored data |
| 24 | CLKAB | Clock input for storing data from A bus into internal registers (↑ edge triggers) |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free select control | SAB/SBA inputs use internal synchronization to prevent metastability and bus contention during mode transitions |
| Mixed-output architecture | A-bus open-collector outputs enable wired-AND logic and voltage-level flexibility; B-bus 3-state outputs simplify bus sharing |
| Independent register control | Separate CLKAB/CLKBA, OEAB/OEBA, and SAB/SBA allow asymmetric data flow - e.g., store A while passing B in real time |
| Real-time bus reinforcement | Asserting both OEAB and OEBA simultaneously enables each bus to reinforce its own state without register involvement |
| Industrial temperature rating | Validated operation from 0°C to 70°C ensures reliability in non-military embedded systems such as PLCs and instrumentation |
Applications
| Legacy Computer Backplane Interface | Industrial PLC Data Routing |
|---|---|
|
Use Scenario: Interfacing CPU address/data buses with multiple peripheral slots in 1980s-era minicomputer backplanes. IC Role / Device Role / Timing Role: Bidirectional octal transceiver and latch managing time-multiplexed A/B bus segments with sub-35-MHz clock alignment. Use Value: Eliminates external glue logic for bus arbitration; open-collector A outputs interface directly with NMOS peripherals requiring pull-up termination. |
Use Scenario: Routing sensor input data and actuator command signals across isolated I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Register-based data staging element synchronizing asynchronous fieldbus reads/writes with deterministic scan-cycle timing. Use Value: Enables deterministic 10 ns setup timing for scan-cycle-critical control loops; 24 mA B-bus drive handles multiple opto-isolator inputs. |
| Test Equipment Bus Multiplexer | Avionics Maintenance Interface Adapter |
|
Use Scenario: Switching between multiple instrument channel data streams onto a shared diagnostic bus in automated test systems. IC Role / Device Role / Timing Role: Configurable bus transceiver supporting both real-time pass-through and captured snapshot modes under microcontroller control. Use Value: Dual select controls (SAB/SBA) allow independent A→B and B→A mode selection - enabling full-duplex monitoring and stimulus injection. |
Use Scenario: Adapting legacy ARINC 429 or MIL-STD-1553B subsystem data to maintenance ground-test equipment using discrete logic interfaces. IC Role / Device Role / Timing Role: Level-shifting and registered bus interface bridging dissimilar voltage domains and timing protocols in line-replaceable units. Use Value: Open-collector A outputs tolerate 12 V pull-ups for compatibility with older avionics signaling; 0 ns hold time simplifies timing with legacy bus controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS652A-1DW | True-path transceiver with 3-state outputs on both A and B buses; higher IOL (48 mA) on -1 version; same DW package | Lacks open-collector A outputs - cannot perform wired-AND or level translation; better for pure TTL bus isolation | Choose when bidirectional 3-state buffering is required without open-collector flexibility |
| SN74AS652DW | Faster propagation (≤12 ns vs ≤18 ns), higher drive (48 mA IOL), but consumes more power (ICC up to 211 mA vs 88 mA) | Supports 90 MHz clocking; suited for high-speed backplanes where ALS speed is insufficient | Choose when timing budget is critical and power/thermal headroom permits AS-series current draw |
Compared with SN74ALS652A-1DW and SN74AS652DW, the SN74ALS654-1DW uniquely provides open-collector A outputs for wired-AND logic and voltage-level adaptation - a capability absent in both alternatives - making it irreplaceable in designs requiring bus contention management or mixed-voltage interfacing.
Availability
SN74ALS654-1DW is available at Aetrix Electronics and suitable for legacy system repair, industrial PLC upgrades, avionics maintenance adapters, and test equipment bus multiplexing requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ALS654-1DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS654 belongs to TI's ALS (Advanced Low-Power Schottky) logic family, designed for high-speed, low-power digital interfacing in cost-sensitive industrial and computing applications where TTL compatibility and predictable timing are essential.
FAQ
What is the key functional distinction of SN74ALS654-1DW versus SN74ALS652A?
The SN74ALS654-1DW features open-collector outputs on the A bus and 3-state outputs on the B bus, enabling wired-AND logic and level translation. In contrast, SN74ALS652A provides 3-state outputs on both buses. This makes SN74ALS654-1DW uniquely suited for bus contention management and mixed-voltage interfacing - a capability SN74ALS652A lacks. The SN74ALS654-1DW also has true data path logic, whereas SN74ALS652A shares that trait but differs in output topology.
Does SN74ALS654-1DW support simultaneous real-time and stored data transfer?
Yes. By asserting both OEAB and OEBA low while holding SAB and SBA low, the SN74ALS654-1DW enables real-time bidirectional transfer - where each bus reinforces its own state without engaging internal registers. This behavior is explicitly documented in the function table and allows transparent bus coupling without storage latency. The SN74ALS654-1DW achieves this via dedicated control logic that bypasses the flip-flops entirely.
What is the maximum clock frequency supported by SN74ALS654-1DW?
The SN74ALS654-1DW supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This value is specified in the "recommended operating conditions" table on page 12 of the SDAS066F datasheet. Timing margins remain valid down to 12.5 ns pulse width and include 10 ns setup time with zero hold time, ensuring reliable operation at full rate.
Can SN74ALS654-1DW be used with 3.3 V logic systems?
No. The SN74ALS654-1DW is an ALS-family device designed for 5 V operation only, with absolute maximum VCC of 7 V and recommended range of 4.5 V to 5.5 V. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for TTL/LS compatibility. Direct connection to 3.3 V logic requires level-shifting circuitry - the SN74ALS654-1DW itself does not support mixed-supply or 3.3 V I/O operation.
Is there a -1 speed grade or higher-drive variant of SN74ALS654-1DW?
No. According to the SDAS066F datasheet (page 2), "There are no -1 versions of the SN54ALS652, SN54ALS653, SN74ALS653, and SN74ALS654." The SN74ALS654-1DW is the only commercially available variant of SN74ALS654, with fixed IOL = 24 mA on the B bus and no enhanced-drive (-1) option. Designers requiring higher drive must consider SN74ALS652A-1DW or SN74AS652DW instead.
SN74ALS654-1DW 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:
- -
SN74ALS654-1DW FAQ
1.How can I place an order for SN74ALS654-1DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS654-1DW 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 SN74ALS654-1DW reliable?
The price and inventory of SN74ALS654-1DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS654-1DW is usually 5 days.
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SN74ALS654-1DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS654-1DW 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 SN74ALS654-1DW?
For technical support, including SN74ALS654-1DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS654-1DW requirements.
6.How does Aetrix verify that SN74ALS654-1DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS654-1DW 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 SN74ALS654-1DW meets industry standards.
7.What is the process for return or replacement of SN74ALS654-1DW?
All SN74ALS654-1DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS654-1DW, 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 SN74ALS654-1DW part is unused and in its original packaging.
Return procedure for SN74ALS654-1DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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