Overview
The SN74LS244DWG4 is an octal buffer and line driver produced by Texas Instruments. This device is part of the SNx4LS24x and SNx4S24x family, designed to enhance the performance and density of three-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. It features two 4-bit buffers and drivers with separate output-enable (G) inputs, allowing for flexible control over the output states.
The SN74LS244DWG4 is particularly useful in mixed 3.3-V and 5-V system environments due to its ability to translate signals between these voltage levels. The device includes 3-state outputs that can drive bus lines directly and can be put into a high impedance state through the G pin, reducing DC loading on bus lines.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC Supply Voltage | 4.75 | 5 | 5.25 | V |
| VIH High-level Input Voltage | 2 | V | ||
| VIL Low-level Input Voltage | 0.8 | V | ||
| IOH High-level Output Current | -15 | mA | ||
| IOL Low-level Output Current | 24 | mA | ||
| TA Operating Free-air Temperature | 0 | 70 | °C | |
| tPLH Propagation Delay Time (Low to High) | 12 | 18 | ns | |
| tPHL Propagation Delay Time (High to Low) | 12 | 18 | ns |
Key Features
- 3-State Outputs: Can drive bus lines directly and can be put into a high impedance state through the G pin.
- PNP Inputs: Reduce DC loading on bus lines.
- Hysteresis at Inputs: Improves noise margins.
- High Fan-Out and Improved Fan-In: Enhances the device's ability to drive multiple loads.
- 400-mV Noise Margin: Provides robust signal integrity.
- Mixed Voltage Compatibility: Can be used in mixed 3.3-V and 5-V system environments.
Applications
- Servers: For high-speed data transmission and buffering.
- LED Displays: To drive display segments efficiently.
- Network Switches: For signal buffering and distribution.
- Telecom Infrastructure: To enhance signal integrity in communication systems.
- Motor Drivers: For controlling and buffering motor control signals.
- I/O Expanders: To extend the input/output capabilities of microcontrollers.
Q & A
- What is the primary function of the SN74LS244DWG4?
The primary function is to act as an octal buffer and line driver, enhancing the performance and density of three-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
- What are the key features of the 3-state outputs?
The 3-state outputs can drive bus lines directly and can be put into a high impedance state through the G pin.
- What is the significance of PNP inputs in this device?
PNP inputs reduce DC loading on bus lines, improving overall system efficiency.
- What is the typical propagation delay time for this device?
The typical propagation delay time (tPLH and tPHL) is around 12-18 ns.
- Can the SN74LS244DWG4 be used in mixed voltage environments?
- What are some common applications of the SN74LS244DWG4?
Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- What is the operating free-air temperature range for this device?
The operating free-air temperature range is from 0°C to 70°C.
- How does the device handle noise margins?
The device features hysteresis at inputs, which improves noise margins.
- What is the maximum high-level output current for this device?
The maximum high-level output current (IOH) is -15 mA.
- What is the package type for the SN74LS244DWG4?
The package type is SOIC (DW).
