Overview
The CD74HC74EG4 is a dual D-type positive-edge-triggered flip-flop integrated circuit produced by Texas Instruments. This device is part of the CD74HC series, known for its high-speed CMOS logic and significant power reduction compared to traditional LSTTL logic ICs. The CD74HC74EG4 features buffered inputs, a wide operating voltage range of 2 V to 6 V, and a wide operating temperature range of –55°C to +125°C, making it versatile for various digital circuit applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | –0.5 | 7 | V | |
| Operating Free-Air Temperature (TA) | –55 | 125 | °C | |
| Input Clamp Current (IIK) | ±20 | mA | ||
| Input Leakage Current (II) | ±1 | µA | ||
| Input Capacitance (Ci) | 10 | pF | ||
| Propagation Delay (tpd) at VCC = 6 V, CL = 50 pF | 14 | 18 | 22 | ns |
| Junction-to-Ambient Thermal Resistance (RθJA) | 133.6 | °C/W |
Key Features
- Buffered inputs
- Wide operating voltage range: 2 V to 6 V
- Wide operating temperature range: –55°C to +125°C
- Supports fanout up to 10 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
- Dual D-type positive-edge-triggered flip-flops with asynchronous preset and clear pins for each flip-flop
Applications
- Convert a momentary switch to a toggle switch
- Divide a clock signal by 2 or 4
- General-purpose digital logic circuits requiring flip-flops
Q & A
- What is the operating voltage range of the CD74HC74EG4?
The operating voltage range is 2 V to 6 V.
- What is the operating temperature range of the CD74HC74EG4?
The operating temperature range is –55°C to +125°C.
- How many flip-flops does the CD74HC74EG4 contain?
The device contains two independent D-type positive-edge-triggered flip-flops.
- What is the maximum propagation delay at VCC = 6 V and CL = 50 pF?
The maximum propagation delay is 22 ns.
- What is the junction-to-ambient thermal resistance for the SOIC package?
The junction-to-ambient thermal resistance is 133.6 °C/W.
- Can the CD74HC74EG4 be used to convert a momentary switch to a toggle switch?
- What is the input capacitance of the CD74HC74EG4?
The input capacitance is 10 pF.
- Does the CD74HC74EG4 support fanout up to 10 LSTTL loads?
- What are the asynchronous control inputs for each flip-flop?
Each flip-flop has asynchronous preset and clear inputs.
- How should unused outputs be handled?
Unused outputs can be left floating but should not be connected directly to VCC or ground.
