Overview
The SN74ACT574DWR, produced by Texas Instruments, is an octal D-type edge-triggered flip-flop with 3-state outputs. This device is part of the ACT family and is designed to operate within a voltage range of 4.5V to 5.5V. It features eight flip-flops, each with a buffered output-enable (OE) input that allows the outputs to be placed in either a normal logic state or a high-impedance state. This functionality is particularly useful in bus-organized systems, enabling the device to drive bus lines without the need for additional interface or pullup components.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC Supply Voltage | V | 4.5 | 5.5 | |
| VIH High-Level Input Voltage | V | 2 | ||
| VIL Low-Level Input Voltage | V | 0.8 | ||
| IOH High-Level Output Current | mA | -8 | ||
| IOL Low-Level Output Current | mA | 8 | ||
| TA Operating Free-Air Temperature | °C | -40 | 85 | |
| tpd CLK to Q Propagation Delay | ns | 2.5 | 7 | 11 |
| fmax Maximum Clock Frequency | MHz | 100 |
Key Features
- Operation within a voltage range of 4.5V to 5.5V.
- Inputs accept voltages up to 5.5V and are TTL-voltage compatible.
- Maximum propagation delay of 9ns at 5V.
- 3-state outputs designed for driving highly capacitive or relatively low-impedance loads.
- Buffered output-enable (OE) input for placing outputs in high-impedance state.
- Suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
Applications
- Buffer registers and working registers.
- I/O ports and bidirectional bus drivers.
- Bus-organized systems where high-impedance states are necessary.
- High-capacitive or low-impedance load environments.
Q & A
- What is the operating voltage range of the SN74ACT574DWR?
The SN74ACT574DWR operates within a voltage range of 4.5V to 5.5V.
- What is the maximum propagation delay of the SN74ACT574DWR at 5V?
The maximum propagation delay is 9ns at 5V.
- What is the purpose of the output-enable (OE) input?
The OE input allows the outputs to be placed in either a normal logic state or a high-impedance state.
- What types of loads can the 3-state outputs drive?
The 3-state outputs are designed to drive highly capacitive or relatively low-impedance loads.
- What are some common applications of the SN74ACT574DWR?
Common applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the maximum clock frequency for the SN74ACT574DWR?
The maximum clock frequency is 100 MHz.
- 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 is the operating temperature range for the SN74ACT574DWR?
The operating temperature range is -40°C to 85°C.
- What are the package options available for the SN74ACT574DWR?
The device is available in DB (SSOP), DW (SOIC), N (PDIP), NS (SOP), and PW (TSSOP) packages.
- Is the SN74ACT574DWR RoHS compliant?
Yes, the SN74ACT574DWR is RoHS compliant.
