Overview
The SN74HCT574NSR, produced by Texas Instruments, is an octal edge-triggered D-type flip-flop with 3-state outputs. This device is specifically designed for bus driving applications and is suitable for implementing 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 a buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state or a high-impedance state.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| High-Level Input Voltage (VIH) | 2 | 2 | V | |
| Low-Level Input Voltage (VIL) | 0.8 | 0.8 | V | |
| Input Voltage (VI) | 0 | VCC | V | |
| Output Voltage (VO) | 0 | VCC | V | |
| Input Transition Rise/Fall Time | 500 | 500 | ns | |
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Clock Frequency (fclock) at 4.5V | 20 | 24 | MHz | |
| Clock Frequency (fclock) at 5.5V | 22 | 27 | MHz | |
| Pulse Duration, CLK High or Low at 4.5V | 16 | 24 | ns | |
| Pulse Duration, CLK High or Low at 5.5V | 14 | 22 | ns | |
| Setup Time, Data Before CLK↑ at 4.5V | 20 | 30 | ns | |
| Setup Time, Data Before CLK↑ at 5.5V | 17 | 27 | ns | |
| Hold Time, Data After CLK↑ | 5 | 5 | ns |
Key Features
- Operating voltage range of 4.5V to 5.5V.
- 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 80μA.
- Typical propagation delay (tpd) of 22ns.
- ±6mA output drive at 5V.
- Low input current of 1μA max.
- Inputs are TTL-voltage compatible.
- Bus-structured pinout.
Applications
The SN74HCT574NSR is particularly suitable for various applications, including:
- Implementing buffer registers.
- Creating I/O ports.
- Bidirectional bus drivers.
- Working registers.
Q & A
- What is the operating voltage range of the SN74HCT574NSR?
The operating voltage range is from 4.5V to 5.5V.
- What is the maximum output drive current at 5V?
The maximum output drive current at 5V is ±6mA.
- What is the typical propagation delay (tpd) of the SN74HCT574NSR?
The typical propagation delay (tpd) is 22ns.
- What is the maximum input current?
The maximum input current is 1μA.
- Are the inputs TTL-voltage compatible?
Yes, the inputs are TTL-voltage compatible.
- What is the operating free-air temperature range?
The operating free-air temperature range is from -40°C to 85°C.
- What is the clock frequency at 4.5V and 5.5V?
The clock frequency at 4.5V is up to 24MHz, and at 5.5V is up to 27MHz.
- What is the setup time for data before the clock rises?
The setup time for data before the clock rises is 20ns at 4.5V and 17ns at 5.5V.
- What is the hold time for data after the clock rises?
The hold time for data after the clock rises is 5ns.
- What types of packages are available for the SN74HCT574NSR?
The device is available in various packages including SOIC, SSOP, TSSOP, and PDIP.
