Overview
The SN74ACT244DBR, produced by Texas Instruments, is an octal buffer and driver with 3-state outputs. This device is designed to enhance the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. It operates within a VCC range of 4.5V to 5.5V and features TTL-compatible inputs that can accept voltages up to 5.5V. The device is organized as two 4-bit buffers and drivers with separate output-enable (OE) inputs, allowing for flexible control over the output states.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | 5.5 | V | |
| Input Voltage | 5.5 | V | ||
| Propagation Delay (tpd) | 1 | 6.5 | 9.5 | ns |
| Output Low Voltage (VOL) | 0.001 | 0.1 | 0.44 | V |
| Output High Voltage (VOH) | 4.5 | 5.5 | V | |
| Output Current (IOL) | 24 mA | |||
| Junction-to-Ambient Thermal Resistance (RθJA) | 117.2 - 126.2 | °C/W |
Key Features
- Operates within a VCC range of 4.5V to 5.5V
- Inputs are TTL-compatible, accepting voltages up to 5.5V
- Maximum propagation delay of 9.5 ns at 5V
- Separate output-enable (OE) inputs for each 4-bit buffer
- High-drive capability with 24-mA current drive per channel
- 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
- Bus-oriented receivers and transmitters
Q & A
- What is the operating voltage range of the SN74ACT244DBR?
The SN74ACT244DBR operates within a VCC range of 4.5V to 5.5V.
- What is the maximum propagation delay of the SN74ACT244DBR at 5V?
The maximum propagation delay is 9.5 ns at 5V.
- Are the inputs of the SN74ACT244DBR TTL-compatible?
- What is the function of the output-enable (OE) inputs?
The OE inputs control the output states; when OE is low, the device passes non-inverted data from the A inputs to the Y outputs, and when OE is high, the outputs are in the high-impedance state.
- What is the current drive capability of the SN74ACT244DBR per channel?
The device can drive up to 24 mA per channel.
- What are some common applications of the SN74ACT244DBR?
Common applications include LED displays, servers and telecommunication systems, switching networks, memory address drivers, clock drivers, and bus-oriented receivers and transmitters.
- What is the thermal resistance of the SN74ACT244DBR in the SSOP package?
The junction-to-ambient thermal resistance (RθJA) for the SSOP package is approximately 117.2 °C/W.
- How should the OE input be managed during power-up or power-down to ensure high-impedance state?
The OE input should be tied to VCC through a pull-up resistor to ensure the outputs are in the high-impedance state during power-up or power-down.
- What is the package type of the SN74ACT244DBR?
The SN74ACT244DBR is available in the SSOP (DB) package among others.
- Is the SN74ACT244DBR compliant with any military standards?
On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted.
