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Texas Instruments SN74ALS241CNSR
- Part No.:
- SN74ALS241CNSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS241CNSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,238
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Product details
Overview
SN74ALS241CNSR from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for memory address and bus driving applications. It features dual independent 4-bit channels, symmetrical active-low output-enable (OE) inputs, pnp input structure for reduced DC loading, and operates over 0°C to 70°C with 4.5–5.5 V supply. It drives TTL/LS bus lines and memory address registers in industrial control and legacy computing systems.
For engineers reviewing the SN74ALS241CNSR datasheet, SN74ALS241CNSR pinout, SN74ALS241CNSR application, or SN74ALS241CNSR equivalent, key selection criteria include its 3-state bus-driving capability, ALS logic family speed-power tradeoff, 24 mA low-level output drive, dual OE control architecture, and compatibility with standard 20-pin SOIC (DW) packaging used in space-constrained PCB layouts.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable (1OE and 2OE) controlling all four outputs simultaneously. The pnp input stage minimizes input current draw, improving fan-in capability in dense logic systems.
Each output supports true 3-state operation with high-impedance disable states controlled by either OE input. Propagation delays range from 2 ns to 11 ns (tPHL/tPLH), and enable/disable times are specified down to 1 ns (tPHZ/tPLZ), enabling precise timing control in synchronous bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - balances speed (vs LS) and power (vs AS), suitable for legacy TTL-compatible systems. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails; absolute max 7 V prevents damage during transient overvoltage. |
| Output Drive | IOL = 24 mA (min) at VO = 0.4 V - sufficient to drive 10+ TTL loads or terminate short stubs on memory address buses. |
| Propagation Delay | tPLH/tPHL ≤ 11 ns (max) at CL = 50 pF - enables reliable operation up to ~45 MHz bus toggle rates in point-to-point configurations. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for office equipment, industrial controllers, and embedded instrumentation. |
| Input Structure | pnp-based inputs - reduces input current to ≤ ±0.1 mA, minimizing loading on preceding gate outputs and preserving signal integrity. |
| 3-State Enable Time | tPZH/tPLZ ≤ 21 ns (max) - ensures clean bus release before next driver activation, critical for glitch-free bus arbitration. |
Pinout & Package
SN74ALS241CNSR is packaged in a 20-pin plastic small-outline integrated circuit (SOIC) with 0.300-inch body width and 1.27 mm pitch, compliant with JEDEC MS-013. Pin 1 is marked via notch or bevel on the package top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 and Channel 2 respectively; both must be low for corresponding Y outputs to drive. |
| 2–5, 11–14 | 1A1–1A4, 2A1–2A4 | Noninverting data inputs; each directly buffers to corresponding Y output without inversion. |
| 6–9, 15–18 | 1Y1–1Y4, 2Y1–2Y4 | 3-state noninverting outputs; high-impedance when respective OE is high. |
| 10 | GND | Ground reference for all internal logic and output stages; requires low-inductance connection to minimize switching noise. |
| 20 | VCC | +5 V supply rail; decoupling capacitor (0.1 µF ceramic) required within 1 cm of this pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit channels | Enables separate control of two memory banks or peripheral address groups using discrete OE signals. |
| Symmetrical active-low OE inputs | Eliminates need for external inverters when interfacing with common bus controller OE signals. |
| pnp input structure | Reduces input current to ≤ 0.1 mA, allowing one ALS gate to drive ≥ 20 inputs without fan-out degradation. |
| 3-state bus driving capability | Permits bidirectional or shared-bus architectures where multiple devices share a single data or address line. |
| ALS family optimization | Delivers 2× speed improvement over standard LS while consuming ~30% less power than AS family at comparable loads. |
Applications
| Memory Address Buffering | Legacy Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address bus between microprocessor and multiple SRAM/ROM chips in industrial PLC backplane. IC Role / Device Role / Timing Role: Noninverting octal buffer providing isolation and drive strength; dual OE allows interleaved access to upper/lower memory banks. Use Value: Ensures full TTL-compatible voltage swing (VOH ≥ 2.4 V, VOL ≤ 0.4 V) across 15 cm trace lengths with <11 ns skew between bits. | Use Scenario: Interfacing Z80 CPU address/data bus to peripheral I/O chips in retro-computing restoration project. IC Role / Device Role / Timing Role: 3-state address latch driver synchronized to MREQ and RD/WR strobes; OE tied to bus grant signal. Use Value: Prevents bus contention during DMA cycles via fast 3-state disable (<21 ns), eliminating need for external bus transceivers. |
| Industrial Control Backplane | Test Equipment Signal Conditioning |
Use Scenario: Buffering configuration address lines in modular analog I/O rack with hot-swap capability. IC Role / Device Role / Timing Role: Isolating controller-side logic from field-side bus; OE controlled by module presence detection. Use Value: pnp inputs limit leakage current to <100 µA per pin, preventing false triggering during partial insertion or ESD events. | Use Scenario: Level-shifting and fan-out expansion for pattern generator outputs driving multiple DUT inputs. IC Role / Device Role / Timing Role: Noninverting repeater ensuring signal integrity across 8 parallel test channels with matched propagation delay. Use Value: Max 11 ns tPLH/tPHL variation across all 8 outputs guarantees <1 ns inter-channel skew for timing-critical stimulus generation. |
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 |
|---|---|---|---|
| SN74ALS244N | Same ALS family, identical pinout and function but with noninverting A→Y and inverted A→Y' outputs per channel. | Requires redesign if only noninverting buffering is needed; not drop-in due to output polarity mismatch. | Select SN74ALS244N only when mixed inverting/noninverting outputs are required in same package. |
| SN74AS241N | Faster AS family variant: tPLH/tPHL ≤ 6.2 ns (vs 11 ns), but higher ICC (22–35 mA vs 9–18 mA) and stricter VIH/VIL thresholds. | Better for high-speed timing-critical paths; unsuitable where power budget or noise margin constraints apply. | Choose SN74AS241N when propagation delay <7 ns is mandatory and power dissipation >2× can be accommodated. |
Compared with SN74ALS241CNSR, SN74ALS244N offers functional divergence rather than equivalence due to output polarity differences, while SN74AS241N trades measurable speed gain (≈50% faster) for doubled supply current and reduced noise immunity-making SN74ALS241CNSR optimal for balanced legacy system upgrades where stability and compatibility outweigh raw speed.
Availability
SN74ALS241CNSR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy computing upgrades, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS241CNSR 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 with broad industrial, automotive, and communications portfolio coverage.
SN74ALS241CNSR belongs to TI's legacy TTL-compatible logic family, engineered specifically for memory address buffering, clock distribution, and bus-oriented receiver/transmitter roles in cost-sensitive, reliability-critical systems.
FAQ
What is the maximum recommended operating temperature for SN74ALS241CNSR?
The SN74ALS241CNSR is characterized for operation from 0°C to 70°C, consistent with commercial-grade logic devices. This range supports deployment in office automation, industrial control panels, and laboratory instrumentation where ambient temperatures remain within standard indoor environments. Exceeding 70°C may cause parameter drift or accelerated aging; thermal derating is not specified in the datasheet.
Does SN74ALS241CNSR support true 3-state outputs on all eight drivers?
Yes, SN74ALS241CNSR provides true 3-state outputs on all eight Y pins (1Y1–1Y4 and 2Y1–2Y4). Each channel's outputs enter high-impedance state when its respective OE input (1OE or 2OE) is held high. The device meets ALS family specifications for IOZL and IOZH leakage currents (±20 µA max), ensuring robust bus isolation during disabled states.
Can SN74ALS241CNSR be used with 3.3 V logic systems?
No, SN74ALS241CNSR is not rated for 3.3 V operation. Its recommended VCC range is 4.5 V to 5.5 V, and absolute maximum supply is 7 V. Input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) are TTL-compatible, not LVTTL. Direct interface with 3.3 V systems requires level-shifting circuitry to avoid undefined logic states or potential damage.
What is the output current capability of SN74ALS241CNSR at VCC = 5 V?
At VCC = 5 V, SN74ALS241CNSR delivers a minimum low-level output current (IOL) of 24 mA per pin when VOL ≤ 0.4 V, and supports high-level output current (IOH) of −12 mA minimum when VOH ≥ 2.4 V. These values ensure reliable driving of standard TTL loads (10-unit load) without external amplification.
Is SN74ALS241CNSR pin-compatible with SN74ALS241CDWR?
Yes, SN74ALS241CNSR and SN74ALS241CDWR share identical 20-pin SOIC (DW) package dimensions, pinout, and electrical specifications. Both are commercial-grade ALS octal buffers with identical function tables, timing, and DC parameters. The "NSR" suffix denotes tape-and-reel packaging (2000 pcs/reel), while "DWR" is the standard orderable part number for the same device.
SN74ALS241CNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SO
SN74ALS241CNSR FAQ
1.How can I place an order for SN74ALS241CNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS241CNSR 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 SN74ALS241CNSR reliable?
The price and inventory of SN74ALS241CNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS241CNSR is usually 5 days.
3.What payment methods are accepted for SN74ALS241CNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS241CNSR transactions.
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4.How is shipping managed for SN74ALS241CNSR?
SN74ALS241CNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS241CNSR 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 SN74ALS241CNSR?
For technical support, including SN74ALS241CNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS241CNSR requirements.
6.How does Aetrix verify that SN74ALS241CNSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS241CNSR 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 SN74ALS241CNSR meets industry standards.
7.What is the process for return or replacement of SN74ALS241CNSR?
All SN74ALS241CNSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS241CNSR, 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 SN74ALS241CNSR part is unused and in its original packaging.
Return procedure for SN74ALS241CNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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