Overview
The SN74LS244DW is an octal buffer and line driver with 3-state outputs, produced by Texas Instruments. This device is part of the SN74LS24x and SN74S24x 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 data transmission.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Supply Voltage | 4.75 to 5.25 | V |
| Operating Free-Air Temperature | 0 to 70 | °C |
| High-Level Input Voltage (VIH) | 2 | V |
| Low-Level Input Voltage (VIL) | 0.8 | V |
| High-Level Output Current (IOH) | -15 | mA |
| Low-Level Output Current (IOL) | 24 | mA |
| Propagation Delay Time (tPLH) | 12 to 18 | ns |
| Propagation Delay Time (tPHL) | 12 to 18 | ns |
| Output Enable Time (tPZL) | 10 to 20 | ns |
| Output Disable Time (tPZH) | 15 to 25 | 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 signal integrity.
- Flexible Output Control: Separate output-enable (G) inputs for each 4-bit buffer.
Applications
- Servers
- LED Displays
- Network Switches
- Telecom Infrastructure
- Motor Drivers
- I/O Expanders
Q & A
- What is the primary function of the SN74LS244DW?
The SN74LS244DW is an octal buffer and line driver with 3-state outputs, designed to improve the performance and density of memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
- What is the operating voltage range for the SN74LS244DW?
The operating voltage range is from 4.75 V to 5.25 V.
- What is the maximum operating temperature for the SN74LS244DW?
The maximum operating temperature is 70°C.
- What is the propagation delay time for the SN74LS244DW?
The propagation delay time (tPLH and tPHL) ranges from 12 ns to 18 ns.
- How do the 3-state outputs work in the SN74LS244DW?
The 3-state outputs can drive bus lines directly and can be put into high impedance mode through the G pin.
- What is the benefit of PNP inputs in the SN74LS244DW?
The PNP inputs reduce DC loading on bus lines.
- What are some common applications of the SN74LS244DW?
Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- How does the SN74LS244DW handle noise margins?
The device features hysteresis at inputs which improves noise margins.
- What is the fan-out capability of the SN74LS244DW?
The device has high fan-out and improved fan-in capabilities.
- Can the SN74LS244DW drive terminated lines?
Yes, the device can drive terminated lines down to 133 Ω.
