Overview
The SN74HCT574DWRE4 is an octal edge-triggered D-type flip-flop integrated circuit produced by Texas Instruments. This device is designed with 3-state outputs, making it particularly suitable for bus driving applications. It is part of the 74HCT series, which is compatible with TTL (Transistor-Transistor Logic) voltage levels. The flip-flops enter data on the low-to-high transition of the clock (CLK) input, and a buffered output-enable (OE) input allows the outputs to be placed in either a normal logic state or a high-impedance state.
Key Specifications
| Parameter | Unit | Min | Nom | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 4.5 | 5 | 5.5 |
| VIH (High-level Input Voltage) | V | 2 | 2 | 2 |
| VIL (Low-level Input Voltage) | V | 0.8 | 0.8 | 0.8 |
| VI (Input Voltage) | V | 0 | VCC | VCC |
| VO (Output Voltage) | V | 0 | VCC | VCC |
| TA (Operating Free-Air Temperature) | °C | -55 | -40 to 85 | 125 |
| tpd (Propagation Delay, CLK to Q) | ns | 40 | 53 | 80 |
| ten (Enable Time, OE to Q) | ns | 34 | 47 | 71 |
| tdis (Disable Time, OE to Q) | ns | 24 | 30 | 45 |
| fmax (Maximum Clock Frequency) | MHz | 20 | 36 | 40 |
Key Features
- Operating voltage range of 4.5 V to 5.5 V, compatible with TTL voltage levels
- High-current 3-state noninverting outputs that can drive bus lines directly or up to 15 LSTTL loads
- Low power consumption, with a maximum ICC of 80 µA
- Typical propagation delay (tpd) of 22 ns to 53 ns depending on the voltage
- ±6-mA output drive at 5 V
- Low input current of 1 µA maximum
- Bus-structured pinout for easy integration into bus systems
- Buffered output-enable (OE) input for controlling output states
Applications
The SN74HCT574DWRE4 is particularly suitable for various applications including:
- Implementing buffer registers and working registers
- Creating I/O ports and bidirectional bus drivers
- Driving bus lines without the need for interface or pull-up components
Q & A
- What is the operating voltage range of the SN74HCT574DWRE4?
The operating voltage range is from 4.5 V to 5.5 V
- What is the typical propagation delay of the SN74HCT574DWRE4?
The typical propagation delay (tpd) ranges from 22 ns to 53 ns depending on the voltage
- How much current can the outputs drive?
The outputs can drive up to ±6 mA at 5 V
- What is the maximum input current?
The maximum input current is 1 µA
- 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 are the typical applications of the SN74HCT574DWRE4?
Typical applications include implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers
- What is the operating temperature range of the SN74HCT574DWRE4?
The operating free-air temperature range is from -40°C to 85°C
- How many flip-flops does the SN74HCT574DWRE4 contain?
The device contains eight edge-triggered D-type flip-flops
- What is the package type of the SN74HCT574DWRE4?
The package type is SOIC (20 pins)
- What is the thermal resistance of the SOIC package?
The junction-to-ambient thermal resistance (RθJA) for the SOIC package is approximately 109.1°C/W
