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Texas Instruments SN74LS244DWG4
- Part No.:
- SN74LS244DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LS244DWG4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,314
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Product details
Overview
SN74LS244DWG4 from Texas Instruments is an octal non-inverting 3-state buffer/line driver in SOIC-20 package, designed for memory address and bus line driving. It features dual 4-bit channels with independent active-low output-enable (1G, 2G), 24 mA low-level output drive, 18 ns typical propagation delay at 5 V, and hysteresis-enhanced noise immunity for reliable operation in industrial bus systems.
For engineers reviewing the SN74LS244DWG4 datasheet, SN74LS244DWG4 pinout, SN74LS244DWG4 application, or SN74LS244DWG4 equivalent, key selection criteria include 3-state bus isolation capability, TTL-compatible input thresholds, 5-V supply operation, and SOIC-20 footprint compatibility with legacy LS logic designs.
Technical Context
The SN74LS244DWG4 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output-enable input (1G and 2G). Its PNP-input structure reduces DC loading on upstream drivers, while built-in input hysteresis provides 400 mV noise margin-critical for noisy industrial bus environments.
All eight outputs are 3-state capable and electrically compatible with standard TTL loads. The device operates within 4.75 V to 5.25 V supply range and supports fan-out of up to 40 LS-TTL loads per output, enabling direct interface with memory address registers and system buses without additional buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation across industrial-grade 5-V rails with ±5% tolerance |
| Output Drive (IOL) | 24 mA - sufficient to directly drive terminated bus lines down to 133 Ω or sink 40 LS-TTL inputs |
| Propagation Delay (tPLH/tPHL) | 12–18 ns - enables reliable timing in 20-MHz-class address/data bus applications |
| Input Hysteresis | 0.2–0.4 V - improves noise immunity on shared bus lines subject to EMI or crosstalk |
| 3-State Leakage (IOZL/IOZH) | ±20 µA - guarantees high-impedance integrity during bus arbitration or power sequencing |
| Quiescent Current (ICC) | 27–46 mA - predictable power budget when outputs are enabled, critical for thermal design |
| Input Compatibility | 2-V minimum VIH - allows interoperability with 3.3-V logic outputs in mixed-voltage systems |
Pinout & Package
SN74LS244DWG4 uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, optimized for surface-mount assembly and thermal performance with RθJA = 90.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 19(2G) | Active-low output enable | Controls Y1–Y4 (Pin 18,16,14,12) and Y1–Y4 (Pin 3,5,7,9) independently; must be pulled high via resistor during power-up to prevent bus contention |
| 1A1–1A4 (Pins 2,4,6,8) | Channel 1 input | Non-inverting data inputs for first 4-bit buffer section; PNP structure minimizes DC loading on source |
| 2A1–2A4 (Pins 11,13,15,17) | Channel 2 input | Non-inverting data inputs for second 4-bit buffer section; electrically identical to Channel 1 |
| 1Y1–1Y4 (Pins 18,16,14,12) | Channel 1 output | 3-state buffered outputs; high-impedance when 1G = HIGH; drives bus lines or memory address registers |
| 2Y1–2Y4 (Pins 9,7,5,3) | Channel 2 output | 3-state buffered outputs; high-impedance when 2G = HIGH; supports bidirectional bus partitioning |
| 10 (GND), 20 (VCC) | Power terminals | Single 5-V supply; decoupling capacitor required near Pin 20 to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual 4-bit control | Enables selective isolation of two bus segments using separate 1G/2G pins-reduces PCB routing complexity vs. discrete buffers |
| Hysteresis-enhanced inputs | 400-mV noise margin prevents false triggering on electrically noisy backplanes or long traces |
| PNP input structure | Reduces input current draw to ≤0.2 mA, minimizing loading on clock drivers or microcontroller GPIOs |
| 3-state bus driving capability | Supports direct connection to shared data/address buses without external pull-ups or direction control logic |
| TTL-compatible voltage thresholds | VIH = 2 V minimum ensures reliable recognition of 3.3-V logic highs, simplifying mixed-voltage system integration |
Applications
| Memory Address Buffering | Industrial Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory ICs on a dense PCB. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer that isolates CPU address outputs from memory bus capacitance and prevents contention during DMA cycles. Use Value: 24 mA drive strength ensures clean signal edges across 100+ pF bus loads; 18 ns max tPHL meets 20-MHz address setup requirements. | Use Scenario: Partitioning a shared RS-485 or CAN controller bus between two subsystems with independent enable control. IC Role / Device Role / Timing Role: Dual-channel bus isolator where 1G/2G pins synchronize with subsystem reset signals to prevent bus glitches during power sequencing. Use Value: Independent enable pins allow staggered activation; hysteresis rejects common-mode noise on factory-floor communication lines. |
| LED Display Multiplexing | Legacy System I/O Expansion |
Use Scenario: Scanning 8-digit 7-segment LED displays using time-multiplexed column drivers. IC Role / Device Role / Timing Role: High-current sink driver for display segment lines, activated only during active digit scan period. Use Value: 24 mA per output sustains full brightness at 1/8 duty cycle; 3-state off-time eliminates ghosting between digits. | Use Scenario: Adding parallel I/O ports to an aging industrial PLC with limited native GPIO. IC Role / Device Role / Timing Role: Level-translating buffer between 3.3-V FPGA I/O and 5-V TTL peripheral interfaces (e.g., relays, sensors). Use Value: 2-V VIH threshold accepts 3.3-V logic highs; SOIC-20 footprint matches legacy board layouts requiring zero redesign. |
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 |
|---|---|---|---|
| SN74LS240DW | Inverting outputs (A→Y inversion); otherwise identical pinout, drive, and timing | Requires logic inversion in upstream signal path; unsuitable where signal polarity must be preserved | Select when bus protocol mandates inverted control signals or when matching existing inverting buffer layout |
| SN74HC244N | CMOS technology; 6-V max supply; 7.5 mA IOL; 19 ns tPD; no hysteresis; higher noise sensitivity | Lower power but reduced drive and noise margin; incompatible with legacy LS load specifications | Choose for new low-power designs with clean电源 and short trace lengths; not drop-in for LS-reliant systems |
Compared with SN74LS240DW and SN74HC244N, SN74LS244DWG4 delivers non-inverting signal integrity, proven 24 mA drive into real-world bus loads, and hysteresis-critical noise rejection-making it the preferred choice for maintaining reliability in field-deployed industrial hardware.
Availability
SN74LS244DWG4 is available at Aetrix Electronics and suitable for memory address buffering, industrial bus isolation, LED display multiplexing, and legacy system I/O expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS244DWG4 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 specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in industrial and automotive electronics.
SN74LS244DWG4 belongs to TI's legacy LS-TTL logic family, engineered specifically for robust bus driving, memory interfacing, and system-level signal isolation in harsh electrical environments.
FAQ
What is the maximum operating temperature range for SN74LS244DWG4?
The SN74LS244DWG4 is rated for commercial operation from 0°C to +70°C ambient temperature. This range aligns with standard industrial-grade SOIC packaging and ensures reliable performance in enclosed control cabinets or non-temperature-controlled equipment enclosures. Exceeding 70°C ambient may cause parameter drift beyond datasheet limits, particularly in output drive and propagation delay.
Does SN74LS244DWG4 support mixed-voltage interfacing with 3.3-V logic?
Yes, SN74LS244DWG4 supports mixed-voltage interfacing: its minimum VIH of 2 V allows reliable recognition of 3.3-V logic-high signals, and inputs tolerate down to 2 V. However, outputs swing to TTL levels (VOH ≈ 2.4 V min), so level-shifting is required for driving true 3.3-V CMOS inputs expecting >2.7 V thresholds.
How should the output-enable pins (1G and 2G) be handled during power-up?
During power-up, both 1G and 2G must be held HIGH via pull-up resistors to ensure outputs remain in high-impedance state until system initialization completes. TI recommends a 10-kΩ pull-up to VCC; lower values increase current draw but improve noise immunity. Leaving these pins floating risks bus contention and potential damage to downstream devices.
Can SN74LS244DWG4 drive terminated transmission lines?
Yes, SN74LS244DWG4 is explicitly characterized to drive terminated lines down to 133 Ω, making it suitable for controlled-impedance bus topologies such as memory address buses or backplane interconnects. For optimal signal integrity, maintain trace length <15 cm and use series termination near the driver output if reflections are observed.
What is the purpose of input hysteresis in SN74LS244DWG4?
Input hysteresis in SN74LS244DWG4 provides a 0.2–0.4 V voltage difference between rising and falling input thresholds (VT+ − VT−), increasing noise immunity on shared bus lines. This prevents oscillation or false triggering caused by slow-rising edges or EMI-induced voltage fluctuations-especially valuable in electrically noisy factory automation or motor-control environments.
SN74LS244DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LS244DWG4 FAQ
1.How can I place an order for SN74LS244DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS244DWG4 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 SN74LS244DWG4 reliable?
The price and inventory of SN74LS244DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS244DWG4 is usually 5 days.
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SN74LS244DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS244DWG4 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 SN74LS244DWG4?
For technical support, including SN74LS244DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS244DWG4 requirements.
6.How does Aetrix verify that SN74LS244DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS244DWG4 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 SN74LS244DWG4 meets industry standards.
7.What is the process for return or replacement of SN74LS244DWG4?
All SN74LS244DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS244DWG4, 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 SN74LS244DWG4 part is unused and in its original packaging.
Return procedure for SN74LS244DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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