Overview
The SN74AHC244PWR is an octal buffer/driver produced by Texas Instruments. This component is designed to enhance the performance and density of 3-state memory-address drivers, clock drivers, and bus-oriented receivers and transmitters. It is organized as two 4-bit buffers/line drivers with separate output-enable (OE) inputs. When the OE input is low, the device passes data from the A inputs to the Y outputs, and when the OE input is high, the outputs are in the high-impedance state. This feature ensures that the outputs remain in a high-impedance state during power-up or power-down by tying the OE input to VCC through a pullup resistor.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Operating Free-Air Temperature (TA) | °C | -40 | 125 | |
| Input Voltage (VI) | V | 0 | 5.5 | |
| Output Voltage (VO) | V | 0 | VCC | |
| High-Level Output Current (IOH) at VCC = 5 V | mA | -8 | ||
| Low-Level Output Current (IOL) at VCC = 5 V | mA | 8 | ||
| Input Transition Rise or Fall Rate at VCC = 5 V | ns/V | 20 | ||
| Propagation Delay Time (tPLH) at VCC = 5 V, CL = 15 pF | ns | 3.9 | 5.5 | 6.5 |
| Propagation Delay Time (tPHL) at VCC = 5 V, CL = 15 pF | ns | 3.9 | 5.5 | 6.5 |
| Package Type | TSSOP (20 pins) | |||
| Package Dimensions | mm | 6.50 x 6.4 |
Key Features
- Organized as two 4-bit buffers/line drivers with separate output-enable (OE) inputs.
- Outputs can be placed in a high-impedance state by setting the OE input high.
- Optimized for operation at 5 V, with the ability to accept input voltages up to 5.5 V.
- Slow edge rates to minimize output ringing.
- Compliant with RoHS and Green standards.
- Available in various package types including TSSOP, SOIC, SOP, SSOP, and PDIP.
Applications
- 3-state memory-address drivers
- Clock drivers
- Bus-oriented receivers and transmitters
- General-purpose buffering and line driving in digital systems
Q & A
- What is the primary function of the SN74AHC244PWR?
The SN74AHC244PWR is an octal buffer/driver designed to improve the performance and density of 3-state memory-address drivers, clock drivers, and bus-oriented receivers and transmitters.
- How do the output-enable (OE) inputs work?
When the OE input is low, the device passes data from the A inputs to the Y outputs. When the OE input is high, the outputs are in the high-impedance state.
- What is the operating voltage range for the SN74AHC244PWR?
The device operates with a VCC range of 2 V to 5.5 V, with optimized performance at 5 V).
- What are the package options available for the SN74AHC244PWR?
The component is available in various packages including TSSOP, SOIC, SOP, SSOP, and PDIP).
- What are the thermal characteristics of the SN74AHC244PWR?
The junction-to-ambient thermal resistance (RθJA) for the TSSOP package is 116.8 °C/W).
- Is the SN74AHC244PWR compliant with RoHS standards?
Yes, the SN74AHC244PWR is compliant with RoHS and Green standards).
- What is the propagation delay time for the SN74AHC244PWR at VCC = 5 V?
The propagation delay time (tPLH and tPHL) at VCC = 5 V and CL = 15 pF is typically 5.5 ns, with a maximum of 6.5 ns).
- How should the OE input be managed during power-up or power-down?
The OE input should be tied to VCC through a pullup resistor to ensure the high-impedance state during power-up or power-down).
- What are the noise characteristics of the SN74AHC244PWR?
The quiet output, maximum dynamic VOL is 0.5 V, and the minimum dynamic VOH is 4.8 V at VCC = 5 V and CL = 50 pF).
- Where can I find detailed specifications and datasheets for the SN74AHC244PWR?
Detailed specifications and datasheets can be found on the Texas Instruments website or through authorized distributors like Digi-Key, Mouser, and Avnet).
