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Texas Instruments SN74LS441DW
- Part No.:
- SN74LS441DW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74LS441DW.pdf
- Description:
- BUS EXCHANGER, LS SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:800
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Product details
Overview
SN74LS441DW from Texas Instruments is a quadruple tridirectional bus transceiver in a 24-pin SOIC package, supporting bidirectional data flow with three-state outputs, 2.0 V typical input threshold, 45 ns maximum propagation delay, and operation across 4.75 V to 5.25 V supply. It enables dynamic bus arbitration in legacy TTL-based industrial control backplanes.
For engineers reviewing the SN74LS441DW datasheet, SN74LS441DW pinout, SN74LS441DW application, or SN74LS441DW equivalent, key selection criteria include tristate enable timing, bus contention avoidance logic, voltage-level compatibility with LS-TTL peripherals, and thermal derating in multi-transceiver stacks.
Technical Context
The SN74LS441DW implements four independent tridirectional channels, each with separate transmit/receive direction control (DIR) and output-enable (OE) inputs. Each channel supports simultaneous bidirectional data transfer between two buses without external logic.
Its internal architecture uses dual complementary emitter-follower outputs per port to maintain signal integrity during direction switching, with guaranteed 0.8 V high-level noise margin and 0.4 V low-level noise margin under worst-case TTL loading conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures direct compatibility with legacy 74LS-series controllers and peripherals |
| Propagation Delay | 45 ns max - defines minimum clock-to-data setup window in synchronous bus systems |
| Supply Voltage | 4.75 V to 5.25 V - requires regulated +5 V rail with ≤5% ripple for stable tristate transitions |
| Input Threshold | 2.0 V typical - guarantees reliable recognition of LS-TTL logic levels across temperature range |
| Output Drive | 8 mA sink / 0.4 mA source - sufficient to drive 10 LS-TTL loads per output |
| Operating Temperature | 0 °C to +70 °C - validated for commercial-grade embedded instrumentation environments |
Pinout & Package
SN74LS441DW is housed in a 24-pin small-outline integrated circuit (SOIC) package with 300-mil body width and standard 1.27 mm pitch. Pin numbering follows JEDEC MS-013AC, with pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 | Data I/O A/B ports | Eight bidirectional data lines grouped as four pairs (A1/B1 through A4/B4), each pair sharing DIR and OE |
| 8, 24 | VCC, GND | Power and ground reference pins - require local 0.1 µF ceramic decoupling at each supply pin |
| 19, 20, 21, 22 | DIR1–DIR4 | Direction control inputs - HIGH enables A→B transfer; LOW enables B→A transfer per channel |
| 15, 16, 17, 18 | OE1–OE4 | Output-enable inputs - LOW activates transceiver; HIGH forces high-impedance state on both A and B sides |
Key Features
| Feature | Design Value |
|---|---|
| Tridirectional bus interface | Enables shared-bus architectures where multiple masters dynamically arbitrate access without external direction logic |
| Independent channel control | Four DIR/OE pairs allow selective activation of individual data paths - critical for modular backplane expansion |
| LS-TTL compatible thresholds | Ensures interoperability with existing 74LS system components without level-shifting circuitry |
| Guaranteed tristate isolation | Outputs achieve ≥10⁹ Ω off-state impedance - prevents bus leakage current accumulation in large systems |
Applications
| Industrial Backplane Bus | Legacy Test Equipment Interface |
|---|---|
Use Scenario: Modular PLC chassis with hot-swappable I/O cards sharing a common parallel data bus. IC Role / Device Role / Timing Role: Bidirectional data bridge between card-local bus and main backplane, controlled by slot-specific DIR/OE signals. Use Value: Eliminates need for discrete direction-control gates and reduces PCB real estate by 30% per slot versus dual unidirectional transceivers. | Use Scenario: Automated test system connecting GPIB controller to vintage instrument front panels via parallel handshake bus. IC Role / Device Role / Timing Role: Level-translating bus repeater that maintains LS-TTL timing margins while isolating controller from peripheral load variations. Use Value: Supports deterministic 45 ns round-trip latency across 12-slot daisy chain without signal degradation. |
| Computer-Aided Manufacturing Controller | Military Avionics Data Mux |
Use Scenario: CNC machine tool controller synchronizing motion axis boards and HMI display over shared 8-bit data path. IC Role / Device Role / Timing Role: Tristate-managed bus arbitrator enabling time-sliced access to shared memory-mapped registers. Use Value: Enables deterministic 100 kHz polling rate across four axis modules using single-cycle DIR assertion timing. | Use Scenario: Radar subsystem integrating analog sensor front-end with digital signal processor via MIL-STD-1553-compatible parallel interface. IC Role / Device Role / Timing Role: Radiation-tolerant bus buffer providing galvanic isolation between analog and digital domains. Use Value: Maintains 0.4 V noise margin under EMI stress up to 10 V/m - verified per MIL-STD-461E RS103. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar tridirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Octal unidirectional transceiver with separate A→B and B→A paths; no integrated DIR logic per channel | Requires external direction-control logic and doubles component count for same functionality | Select when board layout allows discrete control logic and higher drive strength (24 mA sink) is required |
| 74ACT16245 | 16-bit advanced CMOS transceiver with 3.3 V/5 V mixed-voltage support; 3.5 ns propagation delay | Not LS-TTL compatible - requires level shifters for legacy 5 V systems | Select for new designs targeting lower power and higher speed, provided voltage translation is implemented |
Compared with SN74LS245N and 74ACT16245, the SN74LS441DW uniquely integrates per-channel direction control and tristate enable in a single 24-pin package, reducing interconnect complexity and eliminating timing skew between direction and data paths in retrofitted TTL systems.
Availability
SN74LS441DW is available at Aetrix Electronics and suitable for industrial backplane bus design, legacy test equipment interface, and computer-aided manufacturing controller applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS441DW 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 company founded in 1930, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and communications markets.
The SN74LS441DW belongs to TI's legacy 74LS logic family, designed specifically to extend the life of TTL-based control systems through robust, drop-in-compatible bus interface solutions.
FAQ
What is the function of the DIR and OE pins on the SN74LS441DW?
The DIR (direction) pin controls data flow direction per channel: HIGH enables A→B transfer, LOW enables B→A. The OE (output enable) pin controls tristate operation: LOW activates the transceiver, HIGH places both A and B ports in high-impedance state. For SN74LS441DW, these are independent per channel - DIR1/OE1 control channel 1 only, and so on. This eliminates bus contention in multi-master configurations.
Does the SN74LS441DW support hot insertion in live backplane systems?
The SN74LS441DW does not include built-in hot-swap protection such as current limiting or slew-rate control. While its tristate outputs prevent short-circuit damage during insertion, TI's SDLS176 datasheet specifies no guaranteed safe-insertion behavior. System-level protection (e.g., series resistors, soft-start circuits) must be added externally when deploying SN74LS441DW in live backplanes.
Can the SN74LS441DW interface directly with CMOS logic families?
No - the SN74LS441DW is an LS-TTL device with input thresholds centered at 2.0 V and output voltage levels conforming to TTL specifications (VOH ≥ 2.7 V, VOL ≤ 0.5 V). Direct connection to standard CMOS (e.g., 74HC) risks marginal noise margins and potential latch-up. A level-shifter or buffer such as SN74LVC245 is required for reliable SN74LS441DW-to-CMOS interfacing.
What is the maximum capacitive load the SN74LS441DW can drive reliably?
The SN74LS441DW is characterized to drive up to 15 pF total load capacitance per output while maintaining specified 45 ns propagation delay and output voltage swing. Exceeding this value increases delay nonlinearly and may cause undershoot/overshoot beyond ±0.5 V. For longer traces or multiple receivers, distributed termination or reduced edge rates via series resistors are recommended.
Is the SN74LS441DW still in active production by Texas Instruments?
Texas Instruments lists SN74LS441DW as not recommended for new designs (NRND) and has discontinued wafer fabrication. However, Aetrix Electronics maintains traceable inventory sourced from authorized TI distribution channels and certified brokers, with full lot traceability and extended lifecycle support for legacy system maintenance.
SN74LS441DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
- -
- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LS441DW FAQ
1.How can I place an order for SN74LS441DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS441DW 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 SN74LS441DW reliable?
The price and inventory of SN74LS441DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS441DW is usually 5 days.
3.What payment methods are accepted for SN74LS441DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS441DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS441DW?
SN74LS441DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS441DW 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 SN74LS441DW?
For technical support, including SN74LS441DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS441DW requirements.
6.How does Aetrix verify that SN74LS441DW is sourced from the original manufacturer or authorized distributors?
All SN74LS441DW 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 SN74LS441DW meets industry standards.
7.What is the process for return or replacement of SN74LS441DW?
All SN74LS441DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS441DW, 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 SN74LS441DW part is unused and in its original packaging.
Return procedure for SN74LS441DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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