Overview
The SN74AC74PWR is a dual positive-edge-triggered D-type 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. It operates within a voltage range of 2V to 6V, making it versatile for various digital circuit applications. Each flip-flop has a direct clear (CLR) input and a preset (PRE) input, both of which are active low. The device is available in several package types, including TSSOP, SOIC, SSOP, PDIP, and SOP, catering to different design and space requirements.
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 | ||
| VIL (Low-level Input Voltage) at VCC = 5.5V | V | 1.65 | ||
| IOH (High-level Output Current) at VCC = 5.5V | mA | -12 | ||
| fclock (Clock Frequency) at VCC = 5V | MHz | 95 | 140 | |
| tpd (Propagation Delay) at VCC = 5V | ns | 10 | ||
| tsu (Setup Time, Data before CLK↑) at VCC = 5V | ns | 3 | 4 | |
| th (Hold Time, Data after CLK↑) at VCC = 5V | ns | 0.5 | 0.5 |
Key Features
- Dual positive-edge-triggered D-type flip-flops.
- Operates over a voltage range of 2V to 6V.
- Inputs accept voltages up to 6V.
- Maximum propagation delay of 10 ns at 5V.
- Direct clear (CLR) and preset (PRE) inputs, both active low.
- Available in various package types: TSSOP, SOIC, SSOP, PDIP, and SOP.
- High-speed operation with clock frequencies up to 140 MHz at 5V.
Applications
The SN74AC74PWR is suitable for a wide range of digital circuit applications, including:
- Sequential logic circuits.
- Counters and timers.
- Data storage and retrieval systems.
- Bus driving applications due to its 3-state outputs.
- High-speed digital systems requiring low power consumption.
Q & A
- What is the voltage range for the SN74AC74PWR?
The SN74AC74PWR operates within a voltage range of 2V to 6V. - What are the key inputs and outputs of the SN74AC74PWR?
Each flip-flop has a data input (D), a positive edge-triggered clock input (CLK), a clear input (CLR), a preset input (PRE), an output (Q), and an inverted output (Q). - What is the maximum clock frequency for the SN74AC74PWR at 5V?
The maximum clock frequency is up to 140 MHz at 5V. - What are the package options available for the SN74AC74PWR?
The device is available in TSSOP, SOIC, SSOP, PDIP, and SOP packages. - What is the propagation delay of the SN74AC74PWR at 5V?
The maximum propagation delay is 10 ns at 5V. - Can the inputs of the SN74AC74PWR handle voltages higher than VCC?
Yes, the inputs can accept voltages up to 6V. - What is the purpose of the CLR and PRE inputs?
The CLR (clear) and PRE (preset) inputs are used to clear or preset the flip-flop, respectively, and both are active low. - Is the SN74AC74PWR suitable for high-speed applications?
Yes, it is suitable for high-speed applications with low power consumption. - What are some common applications of the SN74AC74PWR?
Common applications include sequential logic circuits, counters, timers, data storage systems, and bus driving. - What is the thermal resistance of the SN74AC74PWR in different packages?
The thermal resistance varies by package; for example, the TSSOP package has a junction-to-ambient thermal resistance of 145.7°C/W.
