Overview
The SN74AC374DWR, produced by Texas Instruments, is an octal D-type edge-triggered flip-flop with 3-state outputs. This device is part of the 74AC series, known for its high-speed and low-power consumption. It features eight D-type flip-flops, each with a buffered output-enable (OE) input, allowing the outputs to be placed in either a normal logic state or a high-impedance state. This capability is particularly useful in bus-organized systems where the outputs need to drive bus lines directly without additional interface components.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 6 | |
| VIH (High-level Input Voltage) at VCC = 5.5V | V | 3.85 | 3.85 | |
| VIL (Low-level Input Voltage) at VCC = 5.5V | V | 1.65 | 1.65 | |
| IOH (High-level Output Current) at VCC = 5.5V | mA | -24 | -24 | |
| IOL (Low-level Output Current) at VCC = 5.5V | mA | 24 | 24 | |
| TA (Operating Free-Air Temperature) | °C | -40 | 85 | |
| fclock (Clock Frequency) at VCC = 5V | MHz | 100 | 100 | |
| tpd (Propagation Delay) at VCC = 5V | ns | 9.5 | 9.5 | |
| Package Type | SOIC (DW) | |||
| Package Size | mm | 12.80 x 10.3 |
Key Features
- Operation over a wide voltage range of 2V to 6V VCC.
- Inputs accept voltages up to 6V.
- Maximum propagation delay of 9.5ns at 5V VCC.
- 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 SN74AC374DWR is particularly suited for various applications in digital systems, including:
- Buffer registers: To temporarily store data and protect it from external interference.
- I/O ports: To manage input/output operations in microprocessor or microcontroller systems.
- Bidirectional bus drivers: To facilitate data transfer between different parts of a system.
- Working registers: To store and manipulate data within a system.
Q & A
- What is the voltage range for the SN74AC374DWR?
The SN74AC374DWR operates over a voltage range of 2V to 6V VCC.
- What is the maximum propagation delay at 5V VCC?
The maximum propagation delay at 5V VCC is 9.5ns.
- What is the purpose of the OE (output enable) pin?
The OE pin allows the outputs to be placed in either a normal logic state or a high-impedance state.
- What types of applications is the SN74AC374DWR suitable for?
The SN74AC374DWR is suitable for buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the clock frequency range for the SN74AC374DWR at 5V VCC?
The clock frequency range at 5V VCC is up to 100 MHz.
- What is the package type and size for the SN74AC374DWR?
The package type is SOIC (DW), and the package size is 12.80mm x 10.3mm.
- How do the 3-state outputs benefit the system?
The 3-state outputs can drive bus lines directly without additional interface components, reducing system complexity.
- What is the operating free-air temperature range for the SN74AC374DWR?
The operating free-air temperature range is -40°C to 85°C.
- What is the high-level output current at 5V VCC?
The high-level output current at 5V VCC is -24 mA.
- How do you ensure proper device operation for unused inputs?
All unused inputs must be held at VCC or GND for proper device operation.
