Overview
The SN74AC244DWR is an octal buffer or driver with 3-state outputs, produced by Texas Instruments. This device is part of the 74AC series and is designed to enhance the performance and density of various digital systems. It operates within a voltage range of 2V to 6V, making it versatile for different applications. The SN74AC244DWR is organized as two 4-bit buffers or drivers with separate output-enable (OE) inputs, allowing for non-inverted data transfer from the A inputs to the Y outputs when OE is low, and high-impedance state when OE is high.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | - | 6 | V |
| VIH High-Level Input Voltage (VCC = 5.5V) | 3.85 | - | 3.85 | V |
| VIL Low-Level Input Voltage (VCC = 5.5V) | 1.65 | - | 1.65 | V |
| IOH High-Level Output Current (VCC = 5.5V) | -24 | - | -24 | mA |
| IOL Low-Level Output Current (VCC = 5.5V) | 24 | - | 24 | mA |
| tPLH Propagation Delay Time (VCC = 5V) | 1.5 | 5 | 7 | ns |
| tPHL Propagation Delay Time (VCC = 5V) | 1.5 | 5 | 7 | ns |
| Ta Operating Free-Air Temperature | -40 | - | 85 | °C |
Key Features
- Operation over a wide voltage range of 2V to 6V.
- Inputs accept voltages up to 6V.
- Maximum propagation delay time of 7.5ns at 5V.
- Separate output-enable (OE) inputs for each 4-bit buffer or driver.
- High-impedance state when OE is high.
- Available in various packages including SOIC (DW), SSOP, VSSOP, PDIP, SOP, TSSOP, and VQFN.
Applications
- Servers and network switches.
- LED displays.
- Telecom infrastructure.
- Motor-drive control boards.
- 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
Q & A
- What is the voltage range for the SN74AC244DWR?
The SN74AC244DWR operates over a voltage range of 2V to 6V.
- What is the maximum propagation delay time at 5V?
The maximum propagation delay time at 5V is 7.5ns.
- How many bits does each buffer or driver handle?
Each buffer or driver handles 4 bits.
- What happens to the outputs when the output-enable (OE) input is high?
The outputs are in the high-impedance state when the OE input is high.
- In what packages is the SN74AC244DWR available?
The SN74AC244DWR is available in packages such as SOIC (DW), SSOP, VSSOP, PDIP, SOP, TSSOP, and VQFN.
- What are some common applications of the SN74AC244DWR?
Common applications include servers, network switches, LED displays, telecom infrastructure, and motor-drive control boards.
- What is the operating free-air temperature range for the SN74AC244DWR?
The operating free-air temperature range is -40°C to 85°C.
- What is the maximum continuous output current for the SN74AC244DWR?
The maximum continuous output current is ±50 mA.
- How should unused inputs be handled for proper device operation?
Unused inputs must be held at VCC or GND for proper device operation.
- What is the purpose of the thermal pad in the RKS package?
The thermal pad can be connected to GND or left floating but should not be connected to any other signal or supply.
