Overview
The SN74HCT574DBRE4 is an octal edge-triggered D-type flip-flop with 3-state outputs, designed and manufactured by Texas Instruments. This component is part of the 74HCT series, which is compatible with TTL (Transistor-Transistor Logic) voltage levels. It operates within a voltage range of 4.5V to 5.5V, making it suitable for a variety of digital logic applications. The device features high-current 3-state noninverting outputs, which can drive bus lines directly or up to 15 LSTTL (Low-power Schottky Transistor-Transistor Logic) loads.
Key Specifications
| Parameter | Min | Typ | 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 |
| Output Voltage (VOH) @ IOH = -20 μA | 4.4 | 4.499 | 4.4 | V |
| Output Voltage (VOH) @ IOH = -6 mA | 3.98 | 4.3 | 3.7 | V |
| Output Voltage (VOL) @ IOL = 20 μA | 0.001 | 0.1 | 0.1 | V |
| Output Voltage (VOL) @ IOL = 6 mA | 0.17 | 0.26 | 0.4 | V |
| Propagation Delay Time (tpd) @ CL = 50 pF | 25 | 32 | 48 | ns |
| Maximum Clock Frequency (fmax) @ CL = 50 pF | 33 | 40 | 22 | MHz |
| Operating Free-Air Temperature (TA) | -40 | 85 | °C |
Key Features
- Operating voltage range of 4.5V to 5.5V
- 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 time (tpd) = 22 ns
- ±6 mA output drive at 5V
- Low input current of 1 μA max
- Inputs are TTL-voltage compatible
- Bus-structured pinout
- Buffered output-enable (OE) input for high-impedance state control
Applications
The SN74HCT574DBRE4 is particularly suitable for various digital logic applications, including:
- Implementing buffer registers
- I/O ports
- Bidirectional bus drivers
- Working registers
Q & A
- What is the operating voltage range of the SN74HCT574DBRE4?
The operating voltage range is 4.5V to 5.5V.
- What is the maximum propagation delay time (tpd) at CL = 50 pF?
The maximum propagation delay time is 48 ns at CL = 50 pF.
- How many LSTTL loads can the outputs drive?
The outputs can drive up to 15 LSTTL loads.
- What is the typical power consumption of the device?
The typical power consumption is 80 μA max ICC.
- Are the inputs TTL-voltage compatible?
Yes, the inputs are TTL-voltage compatible.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can place the outputs in either a normal logic state or the high-impedance state.
- What is the maximum clock frequency at CL = 50 pF?
The maximum clock frequency is 40 MHz at CL = 50 pF.
- What are the typical applications of the SN74HCT574DBRE4?
Typical applications include implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the operating free-air temperature range of the device?
The operating free-air temperature range is -40°C to 85°C.
- How many flip-flops are included in the SN74HCT574DBRE4?
The device includes eight edge-triggered D-type flip-flops.
