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onsemi DM74ALS241AN
- Part No.:
- DM74ALS241AN
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
DM74ALS241AN.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,563
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Product details
Overview
DM74ALS241AN 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 features 24mA low-level output drive, 5V supply operation, 9ns max propagation delay (tPLH/tPHL), and guaranteed switching into 500Ω/50pF loads across 0°C to +70°C.
For engineers reviewing the DM74ALS241AN datasheet, pinout, applications, or equivalent options, this device serves as a legacy-compatible, low-power Schottky TTL buffer for legacy industrial control backplanes, retro-computing I/O expansion, and discrete logic-based data path isolation where 3-STATE control timing and input loading reduction are critical.
Technical Context
The DM74ALS241AN implements two independent 4-bit 3-STATE 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 to ≤–0.1mA (IIL), supporting high-fanout TTL buses without signal degradation.
Switching performance is specified under real-world load conditions: 500Ω series resistance and 50pF capacitive load, with tPZH/tPZL up to 21ns and tPHZ/tPLZ as low as 2ns. All AC/DC parameters-including VOH ≥2.4V (IOH = –3mA), VOL ≤0.5V (IOL = 24mA), and ICC ≤30mA (all outputs active)-are guaranteed over full VCC (4.5–5.5V) and temperature (0–70°C) ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures compatibility with standard 5V TTL logic rails and tolerance against supply ripple. |
| IOL / IOH | 24mA / –15mA - Supports direct driving of multiple LS-TTL inputs or termination resistors without external buffers. |
| tPLH / tPHL | 3ns to 11ns - Enables reliable operation in 25MHz+ synchronous bus cycles with margin. |
| Input Loading | IIL ≤ –0.1mA, IIH ≤ 20µA - Minimizes loading on upstream drivers, preserving signal integrity in fan-out >10 configurations. |
| 3-STATE Leakage | IOZL ≤ –20µA, IOZH ≤ 20µA - Prevents unintended current paths during high-impedance state, critical for shared-bus contention avoidance. |
| Power-Up Safety | Outputs remain in 3-STATE during VCC ramp-up/down - Eliminates bus glitches in hot-swap or power-cycled subsystems. |
Pinout & Package
DM74ALS241AN is housed in a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001 compliant, 0.300" wide, with 2.54mm lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Complementary Output Enable Inputs | 1G active-low enables first 4 buffers; 2G active-high enables second 4 buffers - enables asymmetric bus control logic. |
| 1A1–1A4, 2A1–2A4 | Buffer Input Terminals | Eight non-inverting data inputs grouped into two sets - accepts TTL-compatible voltage levels (VIL ≤ 0.8V, VIH ≥ 2.0V). |
| 1Y1–1Y4, 2Y1–2Y4 | 3-STATE Output Terminals | Eight buffered outputs with high-impedance state when respective G input is inactive - isolates bus segments during arbitration. |
| GND, VCC | Power Supply Pins | Pins 10 and 20 - decoupling capacitor placement adjacent to these pins is required for stable 3-STATE transition timing. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Enable Architecture | Independent 1G (active-low) and 2G (active-high) controls allow flexible bus arbitration schemes without external inverters. |
| PNP Input Structure | Reduces input current loading to ≤–0.1mA (IIL), enabling reliable fan-out to ≥20 LS-TTL loads. |
| Guaranteed Load Switching | Specified for 500Ω series R + 50pF parallel C - matches real PCB trace + stub capacitance, not idealized loads. |
| Power-Ramp 3-STATE Hold | Internal circuitry forces outputs into high-Z during VCC ramp-up/down - prevents metastable bus states in uncontrolled power sequencing. |
| ALS Process Optimization | Lower power than LS counterparts (ICC ≤30mA vs. ~45mA) with comparable speed - extends thermal margin in dense logic layouts. |
Applications
| Industrial Backplane Interface | Retrocomputing I/O Expansion |
|---|---|
Use Scenario: Isolating CPU address/data buses from peripheral cards in modular PLC chassis with hot-pluggable slots. IC Role / Device Role / Timing Role: Bidirectional 3-STATE bus driver providing controlled signal direction and contention-free arbitration via 1G/2G enables. Use Value: Prevents bus contention during card insertion/removal and ensures glitch-free reset sequencing due to power-ramp 3-STATE hold. | Use Scenario: Adding parallel port or ISA-style expansion to vintage 8-bit SBCs (e.g., Z80 or 6502 systems) using discrete logic. IC Role / Device Role / Timing Role: Octal non-inverting buffer with complementary enables for address latching and peripheral select decoding. Use Value: Matches original 74LS241 timing margins while reducing board-level power dissipation by ~30%. |
| Legacy Memory Subsystem | Test Equipment Signal Routing |
Use Scenario: Driving SRAM or EPROM address lines from multiplexed CPU buses in embedded controllers built before 2000. IC Role / Device Role / Timing Role: Address bus driver with low input loading to preserve setup/hold timing across long traces. Use Value: PNP input design limits IIL to –0.1mA, maintaining noise margin and fan-out headroom in aging designs. | Use Scenario: Configurable signal path selection in automated test fixtures where DUT interface signals must be isolated or gated. IC Role / Device Role / Timing Role: Manual or microcontroller-controlled 3-STATE switch for routing analog/digital stimulus signals. Use Value: 21ns max enable/disable time supports sub-50MHz manual trigger synchronization without added latency. |
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 | Identical pinout, function, and DC specs; TI's second-source version with same ALS process and 0–70°C rating. | No functional deviation - drop-in replacement in all legacy 74ALS designs. | Select when sourcing from TI-authorized channels or requiring dual-sourcing assurance. |
| DM74LS241N | Higher ICC (up to 45mA), slower tPLH/tPHL (15ns max), and higher IIL (–0.4mA) - consumes ~50% more power at same speed. | Acceptable where timing margin exists but not suitable for thermally constrained or high-fanout nodes. | Choose only if DM74ALS241N is unavailable and system thermal budget allows extra dissipation. |
Compared with SN74ALS241N, DM74ALS241AN offers identical functionality and timing but may differ in lot traceability and long-term availability; versus DM74LS241N, it delivers measurable power savings and tighter input loading-critical for dense legacy backplanes.
Availability
DM74ALS241AN is available at Aetrix Electronics and suitable for industrial backplane interfaces, retrocomputing I/O expansion, and legacy memory subsystems requiring stable component supply and long-lifecycle support.
Supply support for DM74ALS241AN 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, logic, and power ICs before its acquisition by ON Semiconductor in 2016.
The DM74ALS241AN belongs to Fairchild's advanced low-power Schottky (ALS) TTL logic family, engineered for high-speed, low-power bus interfacing in industrial and computing systems where reliability and legacy compatibility were paramount.
FAQ
What is the operating temperature range for DM74ALS241AN?
The DM74ALS241AN is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade range is validated across all electrical specifications-including propagation delay, output drive, and 3-STATE leakage-and aligns with JEDEC MS-001 PDIP packaging thermal limits. The device is not characterized for extended or industrial temperature ranges.
Does DM74ALS241AN support true bidirectional data flow?
No, DM74ALS241AN is a non-inverting unidirectional buffer. Data flows only from A-inputs to Y-outputs. Bidirectional bus control requires external direction logic (e.g., control signals routed to 1G/2G) and companion transceivers. The complementary enables (1G active-low, 2G active-high) facilitate arbitration-not reversal-of signal direction.
Can DM74ALS241AN be used with 3.3V logic systems?
DM74ALS241AN is not 3.3V compatible. Its absolute maximum VCC is 7V, but recommended operation is strictly 4.5–5.5V. Input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) and output swing (VOH ≥ 2.4V at –3mA) assume 5V rails. Interfacing with 3.3V systems requires level-shifting circuitry; direct connection risks marginal VIH recognition and excessive ICC.
What is the purpose of the two separate enable inputs (1G and 2G) on DM74ALS241AN?
The 1G (active-low) and 2G (active-high) enables provide independent control over two groups of four buffers, allowing asymmetric bus arbitration. For example, 1G can gate CPU-to-peripheral writes while 2G gates peripheral-to-CPU reads-enabling clean separation of data flow directions without external inverters or additional logic gates in the DM74ALS241AN signal path.
How does DM74ALS241AN prevent bus glitches during power-up?
DM74ALS241AN incorporates internal power-ramp detection that forces all eight outputs into high-impedance (3-STATE) until VCC stabilizes within specification. This behavior-guaranteed across 0–70°C-is implemented in silicon and eliminates bus contention or false writes during power supply rise/fall, a key reliability feature absent in standard 74LS devices.
DM74ALS241AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
DM74ALS241AN FAQ
1.How can I place an order for DM74ALS241AN through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS241AN 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 DM74ALS241AN reliable?
The price and inventory of DM74ALS241AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS241AN is usually 5 days.
3.What payment methods are accepted for DM74ALS241AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS241AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS241AN?
DM74ALS241AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS241AN 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 DM74ALS241AN?
For technical support, including DM74ALS241AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS241AN requirements.
6.How does Aetrix verify that DM74ALS241AN is sourced from the original manufacturer or authorized distributors?
All DM74ALS241AN 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 DM74ALS241AN meets industry standards.
7.What is the process for return or replacement of DM74ALS241AN?
All DM74ALS241AN units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS241AN, 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 DM74ALS241AN part is unused and in its original packaging.
Return procedure for DM74ALS241AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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