Overview
The SN74HCT574DWG4 is an octal edge-triggered D-type flip-flop integrated circuit produced by Texas Instruments. This component is designed specifically for bus driving applications and features 3-state outputs. It is part of the 74HCT series, which is TTL-voltage compatible, making it suitable for a wide range of digital logic systems.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| High-Level Input Voltage (VIH) | 2 | 2 | 2 | V |
| Low-Level Input Voltage (VIL) | 0.8 | 0.8 | 0.8 | V |
| Input Voltage (VI) | 0 | VCC | V | |
| Output Voltage (VO) | 0 | VCC | V | |
| Input Transition Rise/Fall Time | 500 | 500 | 500 | ns |
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Clock Frequency (fclock) at 5 V | 20 | 24 | 30 | MHz |
| Pulse Duration, CLK High or Low at 5 V | 16 | 20 | 24 | ns |
| Setup Time, Data Before CLK↑ at 5 V | 20 | 25 | 30 | ns |
| Hold Time, Data After CLK↑ at 5 V | 5 | 5 | 5 | ns |
Key Features
- Wide operating voltage range of 4.5 V to 5.5 V
- High-current 3-state noninverting outputs drive bus lines directly or up to 15 LSTTL loads
- Low power consumption, 80-µA max ICC
- Typical propagation delay (tpd) of 22 ns
- ±6-mA output drive at 5 V
- Low input current of 1-µA max
- Inputs are TTL-voltage compatible
- Bus-structured pinout
- High-impedance state allows outputs to be disconnected from the bus lines
Applications
The SN74HCT574DWG4 is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers in various digital systems. Its 3-state outputs and high drive capability make it ideal for driving bus lines without the need for interface or pull-up components.
Q & A
- What is the operating voltage range of the SN74HCT574DWG4? The operating voltage range is 4.5 V to 5.5 V.
- What is the maximum clock frequency at 5 V? The maximum clock frequency at 5 V is 30 MHz.
- What is the typical propagation delay (tpd) of the SN74HCT574DWG4? The typical propagation delay is 22 ns.
- How much current can the outputs drive at 5 V? The outputs can drive ±6 mA at 5 V.
- What is the maximum input current? The maximum input current is 1 µA.
- What are the typical applications of the SN74HCT574DWG4? Typical applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the operating temperature range of the SN74HCT574DWG4? The operating temperature range is -40°C to 85°C.
- How many flip-flops are included in the SN74HCT574DWG4? The device includes eight edge-triggered D-type flip-flops.
- What is the purpose of the OE (output enable) input? The OE input can place the outputs in either a normal logic state or a high-impedance state.
- What packages are available for the SN74HCT574? Available packages include PDIP, SOIC, SSOP, SOP, and TSSOP.
