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Texas Instruments SN74ALS241C-1DWR
- Part No.:
- SN74ALS241C-1DWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS241C-1DWR.pdf
- Description:
- BUS DRIVER, ALS SERIES
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Inventory:1,000
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Product details
Overview
SN74ALS241C-1DWR from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for memory address and bus driving applications. It features dual independent output-enable inputs (1OE, 2OE), pnp input structure for reduced DC loading, 48 mA low-level output drive capability (−1 version), and operates over 0°C to 70°C. Used in legacy industrial control backplanes and TTL-compatible address latching circuits.
For engineers reviewing the SN74ALS241C-1DWR datasheet, SN74ALS241C-1DWR pinout, SN74ALS241C-1DWR application, or SN74ALS241C-1DWR equivalent, key selection criteria include 3-state bus-driving capability, 20-pin SOIC (DW) package compatibility, ALS logic family timing performance, and −1-spec IOL rating for high-current bus termination.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable control (1OE for Y1–Y4, 2OE for Y5–Y8). Its pnp-input architecture lowers input current draw versus standard TTL, improving fan-in in dense address decoding systems.
Propagation delays range from 2 ns to 11 ns (tPHL/tPLH) under 50 pF load, with enable/disable times as low as 1 ns (tPHZ/tPLZ). The −1 suffix denotes enhanced low-level output current specification (48 mA at VCC = 4.75–5.25 V), distinct from the standard SN74ALS241C's 24 mA rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - balances speed and power vs. standard TTL |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS mixed-signal systems |
| IOL (−1 version) | 48 mA - enables direct drive of multiple TTL loads or unterminated transmission lines |
| tPLH / tPHL | 2 ns / 3 ns typical - supports >50 MHz address/data bus toggling in synchronous designs |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for enclosed industrial controllers |
| Package | SOIC-20 (DW) - surface-mount footprint with 1.27 mm pitch, 7.6 mm × 13.0 mm body |
| 3-State Enable | Dual independent OE inputs (1OE, 2OE) - allows selective activation of upper/lower nibbles on shared bus |
Pinout & Package
SN74ALS241C-1DWR uses a 20-pin SOIC (DW) package with 1.27 mm lead pitch, 7.6 mm width, and 13.0 mm length. Pin 1 is located at the top-left corner (quadrant Q1) per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Output Enable (1OE, 2OE) | Active-low controls for first and second 4-bit buffer groups - enables independent bus segment control |
| 2, 4, 6, 8 | Input A1–A4 | Noninverting data inputs for first buffer group - directly pass logic state to outputs Y1–Y4 |
| 3, 5, 7, 9 | Output Y1–Y4 | 3-state noninverting outputs - high-impedance when corresponding OE is high |
| 11, 13, 15, 17 | Input A5–A8 | Noninverting data inputs for second buffer group - isolated signal path from first group |
| 12, 14, 16, 18 | Output Y5–Y8 | 3-state noninverting outputs - independently enabled by 2OE, electrically isolated from Y1–Y4 |
| 10 | GND | Power return reference - must be low-inductance connection for stable 3-state transitions |
| 20 | VCC | +5 V supply - decoupling capacitor required within 1 cm for noise immunity during output switching |
Key Features
| Feature | Design Value |
|---|---|
| High fan-out capability | Drives up to 40 standard TTL loads (IOL = 48 mA) without external buffers |
| pnp input structure | Reduces input current to ≤0.1 mA - minimizes loading on preceding address latch outputs |
| Symmetrical OE inputs | Matched propagation delay from OE to Y (tPZH/tPLZ ≤ 21 ns) ensures clean bus release timing |
| ALS logic family | 40% lower power than standard LS TTL at comparable speed - critical for dense backplane layouts |
| 3-state bus interface | Outputs float to high impedance when disabled - prevents contention on shared memory/data buses |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address bus between microprocessor and multiple SRAM/ROM chips in industrial PLC mainboard. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory bank select logic; enables time-multiplexed access via OE control. Use Value: 48 mA IOL ensures reliable low-VOL (≤0.5 V) under full bus capacitance, preventing address decode errors during high-speed burst reads. | Use Scenario: Interfacing ISA-style expansion bus between host controller and peripheral cards in test equipment chassis. IC Role / Device Role / Timing Role: Bidirectional bus driver section (using paired SN74ALS241C-1DWR devices) managing address/data separation with precise OE timing. Use Value: Matched tPZH/tPLZ (≤21 ns) guarantees deterministic bus release before next cycle, eliminating metastability in multi-card arbitration. |
| Industrial Backplane Signal Conditioning | TTL-Compatible Clock Distribution |
Use Scenario: Strengthening weak address signals across 30 cm backplane traces in modular I/O rack system. IC Role / Device Role / Timing Role: Impedance-matched buffer compensating for trace loss; pnp inputs prevent loading of upstream CPLD address generators. Use Value: 2.4 V VOH minimum at −12 mA ensures noise margin >0.4 V against 2 V VIH threshold of downstream receivers. | Use Scenario: Distributing synchronized clock and strobe signals to multiple ADC/DAC modules in data acquisition subsystem. IC Role / Device Role / Timing Role: Low-skew noninverting repeater for 10–25 MHz system clocks; dual OE permits dynamic clock gating per module. Use Value: 2 ns tPHL/tPLH variation ensures <100 ps skew across 8 outputs - maintains setup/hold timing for parallel sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS241CN | Same ALS logic, identical electrical specs, but in 20-pin PDIP (N) package | Through-hole mounting only; no reflow compatibility; larger PCB footprint | Select when prototyping or repairing legacy through-hole systems where SOIC rework is impractical |
| SN74AS241AN | AS family: faster (6.2 ns max tPLH), higher IOL (64 mA), but higher ICC (90 mA max) | Higher power consumption; requires tighter thermal management; not drop-in due to different VOL/VOH thresholds | Choose for new designs needing sub-10 ns timing where power budget allows; verify VIH/VIL compatibility |
Compared with SN74ALS241CN, SN74ALS241C-1DWR offers surface-mount assembly efficiency and smaller board area; compared with SN74AS241AN, it trades speed for lower static power and proven compatibility in established ALS-based systems.
Availability
SN74ALS241C-1DWR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy instrumentation interfaces, and TTL-based memory subsystems requiring stable component supply across extended product lifecycles.
Supply support for SN74ALS241C-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
Texas Instruments is a global semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS241C-1DWR belongs to TI's legacy 74ALS logic family, engineered for high-density, low-power bus interfacing in 1980s–1990s industrial computing and control systems.
FAQ
What is the maximum output current rating for SN74ALS241C-1DWR?
The SN74ALS241C-1DWR is rated for 48 mA low-level output current (IOL) when VCC is between 4.75 V and 5.25 V. This −1 suffix designation distinguishes it from the standard SN74ALS241C (24 mA IOL). The 48 mA rating enables direct drive of multiple TTL inputs or moderate-capacitance buses without external amplification. Always verify voltage compliance and thermal derating in high-duty-cycle applications.
Does SN74ALS241C-1DWR support hot-swapping or live insertion?
No, SN74ALS241C-1DWR does not support hot-swapping. Its absolute maximum ratings specify that voltage applied to a disabled 3-state output must not exceed 5.5 V, and no built-in bus-hold, power-up/down protection, or Ioff circuitry is present. Insertion or removal while powered risks latch-up or output-stage damage due to uncontrolled voltage transients. Always power down the system before replacing SN74ALS241C-1DWR.
What is the recommended decoupling strategy for SN74ALS241C-1DWR?
Place a 0.1 µF ceramic capacitor between VCC (pin 20) and GND (pin 10), located within 1 cm of the SN74ALS241C-1DWR package. For systems with high simultaneous switching noise, add a 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point. Avoid shared vias between VCC and GND traces; use dedicated planes or short, wide traces to minimize inductance affecting 3-state transition integrity.
Can SN74ALS241C-1DWR interface directly with CMOS logic inputs?
Yes, SN74ALS241C-1DWR can interface with 5 V CMOS inputs. Its VOH minimum is 2.4 V at −12 mA, exceeding the 2.0 V VIH threshold of standard 5 V CMOS; its VOL maximum is 0.5 V at 48 mA, well below the 1.5 V VIL threshold. However, ensure CMOS inputs do not exceed 5.5 V absolute max, and verify capacitive loading stays within 50 pF for guaranteed timing compliance per datasheet conditions.
Is SN74ALS241C-1DWR RoHS compliant?
Yes, SN74ALS241C-1DWR is RoHS compliant, as confirmed by Texas Instruments' packaging addendum: "RoHS: Yes", with lead finish NIPDAU (nickel/palladium/gold) and MSL Level-1 rating. The part meets EU Directive 2011/65/EU requirements, containing ≤0.1% lead by weight in homogeneous materials. Full compliance documentation, including substance declarations, is available via TI's Quality & Environmental page.
SN74ALS241C-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:
- -
SN74ALS241C-1DWR FAQ
1.How can I place an order for SN74ALS241C-1DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS241C-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 SN74ALS241C-1DWR reliable?
The price and inventory of SN74ALS241C-1DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS241C-1DWR is usually 5 days.
3.What payment methods are accepted for SN74ALS241C-1DWR?
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4.How is shipping managed for SN74ALS241C-1DWR?
SN74ALS241C-1DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS241C-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 SN74ALS241C-1DWR?
For technical support, including SN74ALS241C-1DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS241C-1DWR requirements.
6.How does Aetrix verify that SN74ALS241C-1DWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS241C-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 SN74ALS241C-1DWR meets industry standards.
7.What is the process for return or replacement of SN74ALS241C-1DWR?
All SN74ALS241C-1DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS241C-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 SN74ALS241C-1DWR part is unused and in its original packaging.
Return procedure for SN74ALS241C-1DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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