Overview
The SN74LS244DWE4, produced by Texas Instruments, is an octal buffer and line driver with 3-state outputs. This device is part of the SNx4LS24x family and is 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 data transmission.
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: The outputs can drive bus lines directly and can be put into high impedance mode through the G pin.
- PNP Inputs: Reduces 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 noise immunity.
- Flexible Output Control: Separate output-enable (G) inputs for each 4-bit buffer.
Applications
- Servers: For high-speed data transmission and buffering.
- LED Displays: To drive display segments efficiently.
- Network Switches: For reliable data buffering and transmission.
- Telecom Infrastructure: To enhance signal integrity and transmission speed.
- Motor Drivers: For controlling motor speeds and directions.
- I/O Expanders: To increase the number of I/O lines in a system.
Q & A
- What is the primary function of the SN74LS244DWE4?
The primary function is to act as an octal buffer and line driver with 3-state outputs, enhancing the performance and density of memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
- What are the typical operating voltage ranges for the SN74LS244DWE4?
The typical operating voltage range is from 4.75 V to 5.25 V.
- What is the significance of the 3-state outputs in the SN74LS244DWE4?
The 3-state outputs can drive bus lines directly and can be put into high impedance mode through the G pin, allowing for flexible control over data transmission.
- How does the PNP input feature benefit the SN74LS244DWE4?
The PNP inputs reduce DC loading on bus lines, improving overall system efficiency.
- What is the maximum propagation delay time for the SN74LS244DWE4?
The maximum propagation delay time (tPLH and tPHL) is 18 ns.
- What are some common applications of the SN74LS244DWE4?
Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- What is the operating temperature range for the SN74LS244DWE4?
The operating temperature range is from 0°C to 70°C.
- How does hysteresis at the inputs improve the SN74LS244DWE4's performance?
Hysteresis at the inputs improves noise margins, providing robust noise immunity.
- What is the significance of the high fan-out and improved fan-in in the SN74LS244DWE4?
These features enhance the device's ability to drive multiple loads efficiently.
- Can the SN74LS244DWE4 be used with both 3.3-V and 5-V devices?
Yes, the inputs can be driven from either 3.3-V or 5-V devices.
