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Texas Instruments SN74ALS241CDW
- Part No.:
- SN74ALS241CDW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS241CDW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:590
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Product details
Overview
SN74ALS241CDW from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for memory address bus driving and clock distribution in TTL-compatible systems. It features dual independent 3-state enable inputs (1OE, 2OE), pnp input structure for reduced DC loading, symmetrical output-enable logic, and operates across 0°C to 70°C with 4.5 V–5.5 V supply. It drives high-fan-out bus lines in industrial control backplanes.
For engineers reviewing the SN74ALS241CDW datasheet, SN74ALS241CDW pinout, SN74ALS241CDW application, or SN74ALS241CDW equivalent, key selection criteria include its 20-pin SOIC (DW) package, 48 mA low-level output drive capability (−1 version), 3-state timing performance (tPLH/tPHL ≤ 11 ns), and compatibility with legacy ALS logic families in memory interface and bus buffering roles.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low 3-state enable inputs (1OE and 2OE). Its pnp input stage reduces input current loading on preceding logic stages, improving fan-in capability in dense TTL bus systems.
Each output supports true 3-state operation with guaranteed high-impedance off-state leakage (±20 µA), fast enable/disable times (tPZH/tPLZ ≤ 21 ns), and rail-to-rail voltage tolerance on disabled outputs (up to 5.5 V). The design targets stable bus arbitration in shared-memory architectures where multiple drivers contend for a common data or address path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/ALS power domains without regulation overhead. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
| Low-Level Output Current | 48 mA - enables direct drive of heavy capacitive bus loads (e.g., >100 pF) without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 11 ns - supports reliable operation in 20+ MHz address/data strobe timing windows. |
| 3-State Enable Time | tPZH/tPLZ ≤ 21 ns - guarantees clean bus release before next driver activation, preventing contention glitches. |
| Input Loading | pnp input structure - limits IIH/IIL to ±20 µA/−0.1 mA, reducing loading on upstream gate outputs by >5× vs. standard TTL. |
| Output Leakage (Hi-Z) | ±20 µA - maintains bus integrity during disable state even under noise or crosstalk conditions. |
Pinout & Package
SN74ALS241CDW uses a 20-pin SOIC (DW) package with 0.300″ body width, 1.27 mm lead pitch, and 2.65 mm max height per JEDEC MS-013. Pin 1 is marked via notch or bevel at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Active-low Output Enable (1OE, 2OE) | Independent controls for Group 1 (pins 18,16,14,12) and Group 2 (pins 9,7,5,3) outputs; low = enabled. |
| 2,4,6,8 | Group 1 Inputs (1A1–1A4) | Noninverting data inputs for first four buffers; drive corresponding Y outputs when 1OE = L. |
| 3,5,7,9 | Group 2 Outputs (2Y1–2Y4) | Noninverting buffered outputs for second group; high-impedance when 2OE = H. |
| 12,14,16,18 | Group 1 Outputs (1Y1–1Y4) | Noninverting buffered outputs for first group; high-impedance when 1OE = H. |
| 11,20 | GND, VCC | Power return and +5 V supply pins; decoupling capacitor placement critical for noise immunity. |
| 13,15,17 | Group 2 Inputs (2A1–2A4) | Noninverting data inputs for second four buffers; drive corresponding Y outputs when 2OE = L. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Separate 1OE and 2OE inputs allow interleaved bus access between two subsystems without external gating logic. |
| pnp input structure | Reduces input current draw to ±20 µA/−0.1 mA, enabling >20-fan-in capability from prior-stage gates. |
| High sink drive strength | 48 mA IOL supports direct termination of unterminated transmission lines or multi-drop buses up to 12 inches. |
| Fast 3-state transition | tPZH/tPLZ ≤ 21 ns ensures sub-25 ns bus turnaround time-critical for synchronous memory read/write cycles. |
| TTL/ALS family compatibility | VIH/VIL thresholds (2.0 V/0.8 V) and VOH/VOL levels (≥2.4 V/≤0.4 V) guarantee interoperability with SN74ALS, SN74AS, and legacy 74LS devices. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
Use Scenario: Driving 16-bit address bus from microprocessor to multiple memory chips in an industrial PLC backplane. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory module inputs; enables dynamic bus sharing between CPU and DMA controller. Use Value: 48 mA sink current prevents address line droop under 100 pF load; tPLH ≤ 11 ns ensures setup/hold compliance with 25 MHz memory access timing. | Use Scenario: Distributing a master system clock to eight peripheral controllers in a factory automation rack. IC Role / Device Role / Timing Role: Fan-out buffer replicating and synchronizing clock signal across distributed modules while maintaining edge integrity. Use Value: Symmetrical tPLH/tPHL (2–11 ns) minimizes skew between outputs; pnp inputs reduce jitter contribution from clock generator stage. |
| Bus Transceiver Interface | Legacy System Bus Isolation |
Use Scenario: Bidirectional data bus arbitration between two microcontrollers sharing a common SRAM in a redundant control system. IC Role / Device Role / Timing Role: Dual-group 3-state driver enabling directional control: Group 1 for MCU A → RAM, Group 2 for MCU B → RAM. Use Value: Independent OE pins eliminate need for external direction logic; tPZH ≤ 21 ns ensures <25 ns bus release before opposing driver activates. | Use Scenario: Interfacing modern FPGA-based I/O module to legacy 74ALS-based instrumentation bus in test equipment. IC Role / Device Role / Timing Role: Level- and timing-compatible buffer translating FPGA CMOS outputs to ALS-compliant voltage/current specs for bus loading. Use Value: VIH = 2.0 V and VOL ≤ 0.4 V meet ALS input thresholds; 4.5–5.5 V VCC range matches legacy power rails without level shifters. |
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 electrical specs and logic function, but in 20-pin PDIP (N) package instead of SOIC (DW). | Preferred for through-hole prototyping or legacy board rework where SOIC footprint unavailable. | Select SN74ALS241CN only if manual assembly, socketing, or thermal mass requirements favor DIP over surface-mount. |
| SN74AS241AN | Faster propagation delay (tPLH ≤ 6.2 ns), higher IOL (64 mA), but increased ICC (22–35 mA vs. 9–18 mA) and tighter VIH (2.0 V vs. 2.0 V, same). | Better suited for high-speed bus designs requiring <10 ns timing margins, but less power-efficient in static bus-hold scenarios. | Choose SN74AS241AN only when measured tPLH < 7 ns is required and additional 15–20 mA quiescent current is acceptable. |
Compared with SN74ALS241CN, SN74ALS241CDW offers identical logic and DC specs in a space-saving SOIC package ideal for automated SMT production; versus SN74AS241AN, it trades 3–4 ns speed for ~40% lower active current and proven ALS-family noise margin in electrically noisy industrial environments.
Availability
SN74ALS241CDW is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system upgrades, and memory interface designs requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS241CDW 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS241CDW belongs to TI's legacy ALS (Advanced Low-Power Schottky) logic family, engineered specifically for high-density, low-power bus interfacing in memory and clock distribution systems of 1980s–1990s industrial and computing equipment.
FAQ
What is the maximum recommended supply voltage for SN74ALS241CDW?
The absolute maximum supply voltage for SN74ALS241CDW is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this window risks violating VIH/VIL thresholds and degrading output drive strength. TI specifies 5.0 V nominal for optimal SN74ALS241CDW performance, and sustained use above 5.5 V may accelerate parametric drift or reduce lifetime reliability.
Does SN74ALS241CDW support true bidirectional data flow?
No, SN74ALS241CDW is a unidirectional noninverting buffer with separate input and output pins per channel. It does not contain internal direction control or bus transceiver logic. For bidirectional operation, external OE coordination between two SN74ALS241CDW devices (one per direction) or a dedicated transceiver like SN74ALS245 is required. Each SN74ALS241CDW section functions strictly as input→output with 3-state disable.
What is the meaning of "−1 version" referenced in the SN74ALS241CDW datasheet?
The "−1 version" refers to a variant (e.g., SN74ALS241C-1) with enhanced low-level output current rating of 48 mA under 4.75–5.25 V VCC, whereas the standard SN74ALS241C is rated for 24 mA. SN74ALS241CDW itself is the standard version; its datasheet notes the −1 spec for context but does not imply that SN74ALS241CDW meets the 48 mA rating unless explicitly marked as "−1" in the part number suffix.
Can SN74ALS241CDW be used with 3.3 V logic systems?
No, SN74ALS241CDW is not 3.3 V compatible. Its minimum VIH is 2.0 V at 5 V VCC, but it requires 4.5–5.5 V supply to meet guaranteed VOH ≥ 2.4 V and VOL ≤ 0.4 V. Applying 3.3 V supply results in marginal or nonfunctional outputs and violates recommended operating conditions. For 3.3 V systems, consider TI's SN74LVC244A or similar LVC-family buffers instead of SN74ALS241CDW.
What is the thermal resistance (θJA) of the SN74ALS241CDW SOIC package?
Texas Instruments does not publish θJA for SN74ALS241CDW in the SDAS153E datasheet. As an older ALS-family device, thermal characterization was not standardized in its 1995 revision. For layout guidance, TI recommends using 2–4 cm² of 1 oz copper pour connected to pin 11 (GND) and pin 20 (VCC) to limit junction temperature rise. Actual θJA depends heavily on PCB copper area and airflow; typical SOIC-20 DW packages achieve 120–160°C/W with minimal copper.
SN74ALS241CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS241CDW FAQ
1.How can I place an order for SN74ALS241CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS241CDW 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 SN74ALS241CDW reliable?
The price and inventory of SN74ALS241CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS241CDW is usually 5 days.
3.What payment methods are accepted for SN74ALS241CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS241CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS241CDW?
SN74ALS241CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS241CDW 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 SN74ALS241CDW?
For technical support, including SN74ALS241CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS241CDW requirements.
6.How does Aetrix verify that SN74ALS241CDW is sourced from the original manufacturer or authorized distributors?
All SN74ALS241CDW 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 SN74ALS241CDW meets industry standards.
7.What is the process for return or replacement of SN74ALS241CDW?
All SN74ALS241CDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS241CDW, 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 SN74ALS241CDW part is unused and in its original packaging.
Return procedure for SN74ALS241CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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