Overview
The SN74AC374PWR is an octal D-type edge-triggered flip-flop integrated circuit produced by Texas Instruments. This device features eight flip-flops with 3-state outputs, making it suitable for various applications in digital logic circuits. The flip-flops are triggered on the positive edge of the clock signal and can be placed in a high-impedance state using the output enable (OE) input. This capability is particularly useful in bus-organized systems where the outputs need to be isolated from the bus lines without additional interface components.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 6 | |
| VIH (High-level Input Voltage) | V | 2.1 (VCC = 3 V) | 3.85 (VCC = 5.5 V) | |
| VIL (Low-level Input Voltage) | V | 0.9 (VCC = 3 V) | 1.65 (VCC = 5.5 V) | |
| IOH (High-level Output Current) | mA | -12 (VCC = 3 V) | -24 (VCC = 5.5 V) | |
| IOL (Low-level Output Current) | mA | 12 (VCC = 3 V) | 24 (VCC = 5.5 V) | |
| TA (Operating Free-Air Temperature) | °C | -40 | 85 | |
| fclock (Clock Frequency) | MHz | 60 (VCC = 3.3 V) | 100 (VCC = 5 V) | |
| tpd (Propagation Delay) | ns | 2.5 (VCC = 3.3 V) | 9.5 (VCC = 5 V) | |
| RθJA (Junction-to-Ambient Thermal Resistance) | °C/W | 60 (TSSOP) | 101.2 (SOIC) |
Key Features
- Operation over a wide supply voltage range of 2V to 6V.
- Inputs accept voltages up to 6V.
- Maximum propagation delay of 9.5ns at 5V.
- 3-state noninverting outputs capable of driving bus lines directly.
- Full parallel access for loading data.
- Buffered output-enable (OE) input for high-impedance state control.
- Suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
Applications
The SN74AC374PWR is versatile and can be used in various digital logic applications, including:
- Buffer registers and working registers.
- I/O ports and bidirectional bus drivers.
- Bus-organized systems where outputs need to be isolated from bus lines.
- General-purpose digital logic circuits requiring edge-triggered flip-flops.
Q & A
- What is the operating voltage range of the SN74AC374PWR?
The operating voltage range is from 2V to 6V.
- What is the maximum propagation delay at 5V?
The maximum propagation delay at 5V is 9.5ns.
- What is the function of the OE (Output Enable) input?
The OE input allows the outputs to be placed in a high-impedance state or in a normal logic state (high or low).
- What are the typical applications of the SN74AC374PWR?
Typical applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the clock frequency range for the SN74AC374PWR?
The clock frequency range is up to 100 MHz at 5V and up to 60 MHz at 3.3V.
- How many flip-flops are included in the SN74AC374PWR?
The device includes eight D-type edge-triggered flip-flops.
- What is the thermal resistance of the TSSOP package?
The junction-to-ambient thermal resistance for the TSSOP package is 60°C/W.
- Can the inputs accept voltages higher than VCC?
Yes, the inputs can accept voltages up to 6V.
- What is the purpose of the high-impedance state in the SN74AC374PWR?
The high-impedance state allows the outputs to be isolated from the bus lines without loading or driving them significantly.
- What are the package options available for the SN74AC374?
The device is available in DB (SSOP), DW (SOIC), N (PDIP), NS (SOP), and PW (TSSOP) packages.
