| Allicdata Part #: | SN74ALS20ANSR-ND |
| Manufacturer Part#: |
SN74ALS20ANSR |
| Price: | $ 0.00 |
| Product Category: | Integrated Circuits (ICs) |
| Manufacturer: | Texas Instruments |
| Short Description: | IC GATE NAND 2CH 4-INP 14SOP |
| More Detail: | NAND Gate IC 2 Channel 14-SOP |
| DataSheet: |  SN74ALS20ANSR Datasheet/PDF |
| Quantity: | 1000 |
Specifications
| Current - Output High, Low: | 400µA, 8mA |
| Base Part Number: | 74ALS20 |
| Package / Case: | 14-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package: | 14-SOP |
| Mounting Type: | Surface Mount |
| Operating Temperature: | 0°C ~ 70°C |
| Max Propagation Delay @ V, Max CL: | 12.5ns @ 5V, 50pF |
| Logic Level - High: | 2V |
| Logic Level - Low: | 0.8V |
| Series: | 74ALS |
| Voltage - Supply: | 4.5 V ~ 5.5 V |
| Features: | -- |
| Number of Inputs: | 4 |
| Number of Circuits: | 2 |
| Logic Type: | NAND Gate |
| Part Status: | Active |
| Packaging: | Tape & Reel (TR) |
Description
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Logic gates and inverters are among the most frequently used components in circuit design. The SN74ALS20ANSR is a type of logic gate/inverter commonly used in digital systems. This article looks at the application fields and working principle of this device.The SN74ALS20ANSR is a dual 4-input positive-NAND logic gate-inverter. This device is characterized by its wide power supply range and high noise immunity. With a wide operating voltage of 4.5V to 5.5V, this device is suitable for a variety of applications with varying power supply requirements. As for noise immunity, this device is able to reject noise pulse width changes of up to 10 ns, making it well-suited for use in high noise environments.The SN74ALS20ANSR\'s wide application range and noise immunity make it particularly suitable for use in applications such as volatile memory interfaces, memory cards, ASICs, programmable logic controllers, and motor control applications. In addition, due to its low power consumption and low on-state resistance, this device is also well-suited for use in portable and battery-powered devices.When it comes to the working principle of the SN74ALS20ANSR, the device is based on a Q-coupled NAND logic circuit. This type of circuit consists of three ideal NAND gates (Q1, Q2, Q3), each composed of two single-transistor inverters (N1, N2). Q1 and Q2 are connected in series, with Q3 parallel to them.When power is applied to the circuit, Q1 and Q2 act as buffers to the logic inputs and Q3 acts as the output buffer. The logic inputs are applied to the gates of the semiconductor devices (Q1 and Q2). When the logic input levels are high, current flows through the gate and turns on the transistor in the corresponding inverter. This causes the output of the inverter to go low, resulting in the output of the NAND gate to go high. Conversely, when the logic input levels are low, the gate of the transistor behaves like an open circuit which prevents the transistor from turning on, resulting in the output of the NAND gate to go low.The output of the Q-coupled NAND logic circuit is the same as that of a 4-input positive-NAND logic gate, i.e. high output when all inputs are high and low output when any one input is low. The advantage of this type of circuit is that it only requires one signal and power supply, allowing for fewer connections, thus saving on PCB space and cost.In conclusion, the SN74ALS20ANSR is a dual 4-input NAND logic gate-inverter from the TI/AMCC Logic family. It is characterized by its wide power supply range and high noise immunity, making it suitable for use in a variety of applications. The device is based on the Q-coupled NAND logic circuitry, which provides increased power efficiency and minimized connections, resulting in decreased cost and PCB space.
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