Overview
The SN74ACT244NSR, produced by Texas Instruments, is an octal buffer and driver with 3-state outputs. This component is designed to enhance the performance and density of various digital systems, particularly in applications requiring high-drive capabilities and low propagation delay. The device operates within a voltage range of 4.5V to 5.5V and is organized as two 4-bit buffers and drivers with separate output-enable (OE) inputs. This configuration allows for efficient data transmission and control in complex digital circuits.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | - | 5.5 | V |
| Input Voltage | -0.5 | - | 5.5 | V |
| Propagation Delay (tpd) | 1.5 | 6.5 | 9.5 | ns |
| Output Current (IOH) | -24 | - | -50 | mA |
| Output Current (IOL) | 24 | - | 50 | mA |
| Junction-to-Ambient Thermal Resistance (RθJA) | 48.1 | - | 126.2 | °C/W |
| Operating Temperature Range | -40 | - | 85 | °C |
Key Features
- Operates within a voltage range of 4.5V to 5.5V
- Inputs are TTL-compatible, accepting voltages up to 5.5V
- Maximum propagation delay of 9.5ns at 5V
- High-drive capability with 24-mA current drive per channel
- Separate output-enable (OE) inputs for each 4-bit buffer
- 3-state outputs with high-impedance state when OE is high
Applications
- LED displays
- Servers and telecommunication systems
- Switching networks
- Memory address drivers, clock drivers, and bus-oriented receivers and transmitters
Q & A
- What is the operating voltage range of the SN74ACT244NSR?
The SN74ACT244NSR operates within a voltage range of 4.5V to 5.5V. - What is the maximum propagation delay of the SN74ACT244NSR at 5V?
The maximum propagation delay is 9.5ns at 5V. - Are the inputs of the SN74ACT244NSR TTL-compatible?
Yes, the inputs are TTL-compatible and accept voltages up to 5.5V. - What is the current drive capability per channel of the SN74ACT244NSR?
The device has a high-drive capability with 24-mA current drive per channel. - How are the outputs controlled in the SN74ACT244NSR?
The outputs are controlled by separate output-enable (OE) inputs for each 4-bit buffer. When OE is low, the device passes non-inverted data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. - What are some common applications of the SN74ACT244NSR?
Common applications include LED displays, servers and telecommunication systems, switching networks, and as memory address drivers, clock drivers, and bus-oriented receivers and transmitters. - What is the thermal resistance of the SN74ACT244NSR in different packages?
The junction-to-ambient thermal resistance (RθJA) varies by package, ranging from 48.1°C/W to 126.2°C/W. - How should the output-enable (OE) input be managed during power-up or power-down?
During power-up or power-down, the OE input should be tied to VCC through a pull-up resistor to ensure the outputs are in the high-impedance state. - What is the significance of the 3-state outputs in the SN74ACT244NSR?
The 3-state outputs allow the device to be in one of three states: high, low, or high-impedance, which is useful for bus-oriented applications. - Can the SN74ACT244NSR be used as an LED driver?
Yes, it can be used as an LED driver with appropriate current-limiting resistors.
