Overview
The SN74HCT08DB, produced by Texas Instruments, is a quadruple 2-input positive-AND gate integrated circuit. This device is part of the HCT (High-Speed CMOS) family and is designed to operate with TTL (Transistor-Transistor Logic) voltage levels. It contains four independent 2-input AND gates, each performing the Boolean function Y = A • B in positive logic.
The SN74HCT08DB is available in a 14-pin SSOP (Shrink Small Outline Package) and is suitable for a wide range of digital logic applications due to its compatibility with TTL voltage levels and low power consumption.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range (VCC) | 4.5 | - | 5.5 | V |
| Output High Voltage (VOH) at IOH = –20 μA | 4.4 | 4.499 | 4.4 | V |
| Output Low Voltage (VOL) at IOL = 20 μA | 0.001 | 0.1 | 0.1 | V |
| Input Current (II) at VI = VCC or 0 | ±0.1 | - | ±100 nA | nA |
| Supply Current (ICC) at VI = VCC or 0, IO = 0 | 2 | - | 20 μA | μA |
| Propagation Delay (tpd) at CL = 50 pF | 13 | - | 22 ns | ns |
| Transition Time (tt) at CL = 50 pF | 8 | - | 14 ns | ns |
| Output Drive at 5 V | - | - | ±4 mA | mA |
| Input Capacitance | 3 | - | 10 pF | pF |
Key Features
- Operating voltage range of 4.5V to 5.5V, compatible with TTL voltage levels.
- Outputs can drive up to 10 LSTTL loads, ensuring robust signal transmission.
- Low power consumption, with a maximum supply current (ICC) of 20 μA.
- Typical propagation delay (tpd) of 13 ns, and transition time (tt) of 8 ns at 5 V.
- ±4 mA output drive at 5 V, providing strong output signals.
- Low input current of 1 μA max, reducing power consumption and heat generation.
- Inputs are TTL-voltage compatible, making it versatile for various digital logic applications).
Applications
- Combining power good signals in power supply systems to ensure all power rails are within specified limits.
- Enabling digital signals in control circuits, such as in industrial automation and consumer electronics.
- Implementing digital logic functions in a variety of electronic systems, including computing, communication, and automotive systems).
- Used in educational projects and prototyping due to its simplicity and versatility in digital logic circuits).
Q & A
- What is the SN74HCT08DB used for?
The SN74HCT08DB is used as a quadruple 2-input positive-AND gate in digital logic circuits, performing the Boolean function Y = A • B in positive logic).
- What is the operating voltage range of the SN74HCT08DB?
The operating voltage range is from 4.5V to 5.5V).
- How many AND gates are included in the SN74HCT08DB?
The device contains four independent 2-input AND gates).
- What is the typical propagation delay of the SN74HCT08DB?
The typical propagation delay (tpd) is 13 ns at 5 V).
- What is the maximum output drive current of the SN74HCT08DB?
The maximum output drive current is ±4 mA at 5 V).
- What are the package options for the SN74HCT08DB?
The SN74HCT08DB is available in a 14-pin SSOP (Shrink Small Outline Package)).
- Is the SN74HCT08DB compatible with TTL voltage levels?
Yes, it is compatible with TTL voltage levels).
- What is the maximum supply current (ICC) of the SN74HCT08DB?
The maximum supply current (ICC) is 20 μA).
- What are some common applications of the SN74HCT08DB?
Common applications include combining power good signals, enabling digital signals, and implementing digital logic functions in various electronic systems).
- What is the operating temperature range of the SN74HCT08DB?
The operating temperature range is from –40°C to 85°C).
