Overview
The SN74HC574AN is an octal edge-triggered D-type flip-flop integrated circuit produced by Texas Instruments. This device is designed to operate within a wide voltage range and is particularly suited for applications requiring bus driving, such as buffer registers, I/O ports, bidirectional bus drivers, and working registers. The flip-flops enter data on the low-to-high transition of the clock (CLK) input and feature 3-state outputs that can be placed in a high-impedance state, allowing them to drive bus lines without additional interface or pullup components.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Input Transition Rise/Fall Time | 1000 (VCC=2V), 500 (VCC=4.5V), 400 (VCC=6V) | ns | ||
| Clock Frequency | 6 (VCC=2V), 30 (VCC=4.5V), 38 (VCC=6V) | MHz | ||
| Pulse Duration, CLK High or Low | 80 (VCC=2V), 16 (VCC=4.5V), 14 (VCC=6V) | ns | ||
| Setup Time, Data Before CLK↑ | 100 (VCC=2V), 20 (VCC=4.5V), 17 (VCC=6V) | ns | ||
| Hold Time, Data After CLK↑ | 5 | ns | ||
| Junction Temperature | -55 | 150 | °C | |
| Storage Temperature Range | -65 | 150 | °C |
Key Features
- Wide Operating Voltage Range of 2 V to 6 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 tpd = 22 ns
- ±6-mA Output Drive at 5 V
- Low Input Current of 1-µA Max
- Bus-Structured Pinout
- Buffered Output-Enable (OE) Input for High-Impedance State
Applications
- Buffer Registers
- I/O Ports
- Bidirectional Bus Drivers
- Working Registers
Q & A
- What is the operating voltage range of the SN74HC574AN?
The operating voltage range is from 2 V to 6 V.
- What is the maximum clock frequency for the SN74HC574AN at 6 V?
The maximum clock frequency at 6 V is 38 MHz.
- How many LSTTL loads can the outputs drive?
The outputs can drive up to 15 LSTTL loads.
- What is the typical propagation delay time (tpd) for the SN74HC574AN?
The typical propagation delay time is around 22 ns.
- 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 SN74HC574AN?
Typical applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the maximum junction temperature for the SN74HC574AN?
The maximum junction temperature is 150°C.
- What is the storage temperature range for the SN74HC574AN?
The storage temperature range is from -65°C to 150°C.
- How many flip-flops are included in the SN74HC574AN?
The device includes eight edge-triggered D-type flip-flops.
- What is the effect of the OE input on the internal operations of the flip-flops?
The OE input does not affect the internal operations of the flip-flops; old data can be retained or new data can be entered while the outputs are in the high-impedance state.
