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Texas Instruments 74ALS241C-1DWR
- Part No.:
- 74ALS241C-1DWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74ALS241C-1DWR.pdf
- Description:
- OCTAL BUFFERS AND LINE DRIVERS W
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Inventory:5,000
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Product details
Overview
74ALS241C-1DWR from Fairchild Semiconductor is an octal 3-STATE bus driver with complementary enable gating, designed for bidirectional bus interfacing in microprocessor and memory systems. It delivers 24mA low-level output drive, 9ns max propagation delay (tPLH/tPHL), and operates across 4.5V–5.5V VCC at 0°C to +70°C. Its SOIC-20 package supports high-density PCB layouts in industrial control backplanes.
For engineers reviewing the 74ALS241C-1DWR datasheet, 74ALS241C-1DWR pinout, 74ALS241C-1DWR application, or 74ALS241C-1DWR equivalent, key selection criteria include complementary enable logic, 3-STATE output isolation during power ramp-up/down, guaranteed switching into 500Ω/50pF loads, and ALS-family compatibility with DM74LS241A.
Technical Context
The 74ALS241C-1DWR implements two independent 4-bit buffer groups, each controlled by separate active-low (1G) and active-high (2G) enables-enabling asymmetric bus arbitration. Its PNP input structure reduces input loading, while internal 3-STATE circuitry holds outputs in high-impedance state during VCC ramp-up/ramp-down to prevent bus contention.
It uses advanced low-power oxide-isolated ion-implanted Schottky TTL process, delivering improved speed-power trade-off versus standard LS: 9ns max tPLH at 24mA IOL, with ICC of 17–30mA depending on output state, all specified over full temperature and supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - ensures stable operation with standard 5V TTL rails and tolerates ±10% supply variation |
| IOL (Low-Level Output) | 24mA - drives heavy capacitive loads and multiple TTL inputs without external buffering |
| tPLH / tPHL | 3ns min / 11ns max - enables reliable timing in 25MHz+ synchronous bus cycles with margin |
| 3-STATE Enable/Disable | tPZH ≤ 21ns, tPHZ ≤ 10ns - supports fast bus turnaround in multiplexed address/data architectures |
| Input Clamp Voltage (VIK) | –1.5V - protects against negative transients up to –1.5V without damage or latch-up |
| ICC (3-STATE Outputs) | 17–30mA - defines worst-case quiescent current when outputs are disabled but inputs active |
Pinout & Package
74ALS241C-1DWR is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide (Package M20B), with 1.27mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input A1–A8 | Eight data inputs feeding respective buffers; PNP-input design minimizes loading on upstream drivers |
| 9, 10, 11, 12, 13, 14, 15, 16 | Output Y1–Y8 | Octal 3-STATE outputs; high-impedance state maintained during power transitions to avoid bus glitches |
| 17 | 1G (Active-Low Enable) | Enables first group (Y1–Y4) when LOW; complements 2G for independent control of dual 4-bit lanes |
| 18 | 2G (Active-High Enable) | Enables second group (Y5–Y8) when HIGH; allows asymmetric gating for priority bus access schemes |
| 20 | VCC | +5V supply pin; decoupling required within 10mm due to fast edge rates and switching current |
| 10 | GND | Ground reference for all inputs, outputs, and internal logic; must be low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| Complementary enable architecture | Independent active-low (1G) and active-high (2G) controls allow flexible bus arbitration without external inverters |
| Power-ramp 3-STATE hold | Outputs remain high-impedance during VCC rise/fall - eliminates bus contention at power-on/off in embedded controllers |
| ALS Schottky TTL process | Delivers 24mA drive with 11ns max propagation delay and lower ICC than LS equivalents under identical loads |
| Guaranteed switching into 500Ω/50pF | Validated performance with realistic bus load conditions - no derating needed for typical backplane designs |
Applications
| Microprocessor Address Bus Driver | Memory Data Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a Z80 or 8085 CPU to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Bidirectional buffer with independent enable groups isolates address latches from memory decoding logic during refresh cycles. Use Value: Complementary 1G/2G enables allow one group to hold addresses while the other releases - preventing bus collisions during DMA handshaking. | Use Scenario: Isolating RAM/ROM data buses in a multi-chip memory subsystem with shared data lines. IC Role / Device Role / Timing Role: Octal 3-STATE driver provides controlled data path between CPU and memory banks, synchronized with RD/WR strobes. Use Value: 24mA IOL ensures clean signal integrity across 10+ TTL loads; tPHZ ≤ 10ns enables sub-100ns bus turnaround for 10MHz memory access. |
| Industrial PLC Backplane Interface | Legacy Instrumentation Bus Arbiter |
Use Scenario: Interfacing modular I/O cards to a central controller via a 20-pin parallel backplane in factory automation systems. IC Role / Device Role / Timing Role: Dual-gated bus driver manages direction and timing of status/control signals across hot-swappable modules. Use Value: Power-ramp 3-STATE hold prevents spurious writes during card insertion/removal - critical for fail-safe operation. | Use Scenario: Arbitrating communication between analog front-end ADCs and digital processing units in test equipment. IC Role / Device Role / Timing Role: Enables time-multiplexed sharing of a common data bus among multiple sensor channels. Use Value: Guaranteed 500Ω/50pF switching ensures consistent timing across varying channel counts without layout-dependent tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-STATE bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS241N | PDIP-20 package; identical electrical specs and pinout; higher θJA (60.5°C/W vs 79.8°C/W for SOIC) | Suitable for prototyping or through-hole assembly; less suitable for high-density or thermally constrained boards | Select when manual soldering or socket-based validation is required; verify thermal margin in enclosed enclosures |
| DM74ALS241AWM | Same SOIC-20 (M20B) package and full spec compliance; Fairchild's direct orderable variant of same die | No functional difference; differs only in part numbering convention and tape-and-reel availability | Preferred for new designs requiring documented legacy sourcing continuity and full Fairchild support |
Compared with SN74ALS241N and DM74ALS241AWM, the 74ALS241C-1DWR offers identical core functionality in a space-saving SOIC package optimized for automated assembly, with verified thermal resistance (79.8°C/W) and guaranteed 3-STATE behavior during power sequencing - making it optimal for volume production of compact industrial controllers.
Availability
74ALS241C-1DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, microprocessor address bus interfaces, and legacy instrumentation bus arbiters requiring stable component supply and long-term obsolescence management.
Supply support for 74ALS241C-1DWR 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic families remain widely supported in industrial and aerospace applications.
The 74ALS241C-1DWR belongs to the Advanced Low-Power Schottky (ALS) logic family, engineered for high-speed, low-power bus interfacing in microprocessor, memory, and communications systems where reliability and timing predictability are critical.
FAQ
What is the function of the 1G and 2G pins on the 74ALS241C-1DWR?
The 1G pin is an active-low enable controlling outputs Y1–Y4, while 2G is an active-high enable for outputs Y5–Y8. This complementary gating allows independent control of two 4-bit lanes - essential for asymmetric bus arbitration in systems like Z80-based computers. The 74ALS241C-1DWR leverages this architecture to eliminate external inverters and reduce board complexity in dual-bus configurations.
Does the 74ALS241C-1DWR support hot-swap or power-ramp conditions safely?
Yes. The 74ALS241C-1DWR incorporates internal circuitry that forces outputs into high-impedance state during VCC ramp-up or ramp-down, preventing bus contention and glitches. This feature is explicitly guaranteed in the datasheet and makes the 74ALS241C-1DWR suitable for industrial backplanes where module insertion/removal occurs under partial power.
What is the maximum capacitive load the 74ALS241C-1DWR can drive while maintaining specified timing?
The 74ALS241C-1DWR switching characteristics are guaranteed into a 50pF load with 500Ω source termination, per the datasheet. While it can drive higher capacitance, timing margins degrade beyond 50pF - for loads exceeding this, use series termination or buffer staging. The 74ALS241C-1DWR's 24mA IOL supports driving 10+ standard TTL inputs directly without timing violation.
Is the 74ALS241C-1DWR pin-compatible with the 74LS241?
No - the 74ALS241C-1DWR is functionally compatible but not pin-compatible with the 74LS241. It matches the DM74LS241A pinout, not the older 74LS241. Always verify against the DM74ALS241A connection diagram. The 74ALS241C-1DWR shares identical pin assignments with DM74ALS241AWM and SN74ALS241N, enabling drop-in replacement within the ALS family.
What is the recommended decoupling for the 74ALS241C-1DWR in high-speed operation?
Place a 0.1µF ceramic capacitor between VCC (pin 20) and GND (pin 10) within 5mm of the 74ALS241C-1DWR package, plus a 4.7µF–10µF bulk capacitor nearby on the 5V rail. This suppresses switching noise from the 24mA output transitions and maintains stable VCC during tPLH/tPHL edges. Layout adherence is critical - the 74ALS241C-1DWR's 11ns max delay assumes proper local decoupling.
74ALS241C-1DWR 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:
- -
74ALS241C-1DWR FAQ
1.How can I place an order for 74ALS241C-1DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ALS241C-1DWR 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 74ALS241C-1DWR reliable?
The price and inventory of 74ALS241C-1DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALS241C-1DWR is usually 5 days.
3.What payment methods are accepted for 74ALS241C-1DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALS241C-1DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ALS241C-1DWR?
74ALS241C-1DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ALS241C-1DWR 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 74ALS241C-1DWR?
For technical support, including 74ALS241C-1DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALS241C-1DWR requirements.
6.How does Aetrix verify that 74ALS241C-1DWR is sourced from the original manufacturer or authorized distributors?
All 74ALS241C-1DWR 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 74ALS241C-1DWR meets industry standards.
7.What is the process for return or replacement of 74ALS241C-1DWR?
All 74ALS241C-1DWR units undergo pre-shipment inspection (PSI). If there is an issue with 74ALS241C-1DWR, 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 74ALS241C-1DWR part is unused and in its original packaging.
Return procedure for 74ALS241C-1DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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