Overview
The SN74AC374DWRE4 is an octal D-type edge-triggered flip-flop integrated circuit produced by Texas Instruments. This device is part of the 74AC series, known for its high-speed and low-power consumption. The SN74AC374 features eight D-type flip-flops with 3-state outputs, making it suitable for a variety of applications including buffer registers, I/O ports, bidirectional bus drivers, and working registers.
The device operates over a supply voltage range of 2V to 6V and can accept input voltages up to 6V. It is designed to drive highly capacitive or relatively low-impedance loads directly, enhancing its utility in bus-organized systems.
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 = 5V | mA | -12 | -12 | |
| IOL (Low-level Output Current) at VCC = 5V | mA | 12 | 12 | |
| fclock (Clock Frequency) at VCC = 5V | MHz | 100 | 100 | |
| tpd (Propagation Delay) at VCC = 5V | ns | 2.5 | 8 | 9.5 |
| tsu (Setup Time) at VCC = 5V | ns | 4 | 5 | |
| th (Hold Time) at VCC = 5V | ns | 1.5 | 1.5 | |
| RθJA (Junction-to-Ambient Thermal Resistance) for DW Package | °C/W | 101.2 | 101.2 |
Key Features
- Operation over a 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
- Buffer registers: The device can act as a buffer between different parts of a system, ensuring data integrity.
- I/O ports: It can be used to manage input/output operations in various digital systems.
- Bidirectional bus drivers: The 3-state outputs make it ideal for driving bus lines in bus-organized systems.
- Working registers: It can store and manage data within a system, especially in sequential logic circuits.
Q & A
- What is the operating voltage range of the SN74AC374?
The SN74AC374 operates over a supply voltage range of 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) pin?
The OE pin can place the outputs in either a normal logic state or a high-impedance state.
- What types of packages are available for the SN74AC374?
The device is available in DB (SSOP), DW (SOIC), N (PDIP), NS (SOP), and PW (TSSOP) packages.
- What is the clock frequency range at VCC = 5V?
The clock frequency range at VCC = 5V is up to 100 MHz.
- What is the thermal resistance (RθJA) for the DW package?
The thermal resistance (RθJA) for the DW package is 101.2°C/W.
- Can the SN74AC374 drive highly capacitive loads?
Yes, the device is designed to drive highly capacitive or relatively low-impedance loads directly.
- What is the purpose of the high-impedance state in the SN74AC374?
The high-impedance state allows the outputs to neither load nor drive the bus lines significantly, which is useful in bus-organized systems.
- How does the setup time and hold time vary at different VCC levels?
The setup time and hold time vary slightly with different VCC levels, but at VCC = 5V, the setup time is 4ns to 5ns and the hold time is 1.5ns.
- What are some common applications of the SN74AC374?
Common applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers.
