All You Need to Know About the 74LS32 OR Gate
07 December 2023
Ⅰ. What is the 74 series logic chip?
Ⅲ. Pin configuration and functions of 74LS32 OR Gate
Ⅳ. What are the features of 74LS32 OR Gate?
Ⅴ. Internal structure of 74LS32 OR Gate
Ⅵ. Technical parameters of 74LS32 OR Gate
Ⅶ. How does the 74LS32 OR Gate work?
Ⅷ. What are the applications of 74LS32 OR Gate?
Ⅸ. Precautions for using 74LS32 OR Gate
An OR Gate chip is a type of logic gate circuit commonly found in digital circuits, and its function is to determine whether at least one high level signal exists in the input signal. In this article, we will introduce a widely used OR Gate chip 74LS32.
The 74 series logic chip is a digital logic integrated circuit, commonly used in the design of digital circuits. It contains a large number of logic gate circuits, such as AND GATE, OR Gate, NON-GATE, ISO-ORTHO GATE and so on. These gates can be combined together to form complex digital logic circuits that are used to realize various functions. It can be used not only for processing and converting digital signals, but also for designing timing control circuits, timers and other timing devices.
The 74 series is a series of digital integrated circuits, which includes a variety of chip series such as 74XXX, 74SXXX, 74ALSXXX, 74ASXXX, 74LSXXX, 74CXXX, 74HCXXX and 74HCTXXX.
• 74XXX (Standard): Early products are still in use today, but they are being phased out.
• 74SXXX (Low Power Schottky): It is a high-speed TTL improvement of the 74-series. It has a high performance with a non-gate average transmission time of about 10ns. However, the large static power consumption of the circuit of this series of products has led to a gradual limitation of its application range. At present, the use of this series of products is becoming less and less, and it is gradually being phased out.
• 74ALSXXX (Advanced Low Power Schottky): It is the successor to the 74LS-series and offers significant improvements in speed (4ns typical) and power consumption (1mW typical). Nevertheless, it is relatively expensive.
• 74ASXXX (Advanced Schottky): It is the successor to the 74S-series, also known as the Advanced Ultra-High Speed Schottky series.
• 74LSXXX (Schottky): It is the main product family of the current TTL type. It is cost-effective and currently widely used in small and medium-sized circuits.
74LS32 is a four-input OR Gate chip. It has four input ports (A, B, C, D) and one output port (Y). When any one of the four input ports receives a high level signal, the output port Y will be set high. The chip adopts low-power S-type technology and can work with other TTL logic gate chips. In digital circuits, it plays the role of a logic gate and can fulfill the function of Boolean operation. It is used in many electronic fields such as logic operations, embedded systems, digital signal processing and control systems.
Replacements and equivalents:
• CD4071
• 74AC32
• 74ALS32
• 74F32
• 74HCT32
• 74LVC32
As shown in the picture, 74LS32 has 14 pins, whose names and descriptions are as follows:
Pin 1 (1A): input 1 of gate 1
Pin 2 (1B): input 2 of gate 1
Pin 3 (1Y): output of gate 1
Pin 4 (2A): input 1 of gate 2
Pin 5 (2B): input 2 of gate 2
Pin 6 (2Y): output of gate 2
Pin 7 (GND): ground pin
Pin 8 (3Y): output of gate 3
Pin 9 (3B): input 2 of gate 3
Pin 10 (3A): input 1 of gate 3
Pin 11 (4Y): output of gate 4
Pin 12 (4B): input 2 of gate 4
Pin 13 (4A): input 1 of gate 4
Pin 14 (VCC): supply voltage
• It has four independent gates, each gate performs a logical OR function.
• The 74LS32 is a high-speed device suitable for applications requiring fast logic operations.
• The 74LS32 is compatible with CMOS, NMOS and TTL and can interact directly with various systems.
• It comes in various packages such as SOIC, SOP and PDIP.
• The 74LS series generally has relatively low power consumption and is suitable for electronic equipment where power consumption is a consideration.
The appearance and structure of 74LS32 are shown in the figure. The 74LS32 chip contains four independent 2-input OR gates. Each OR gate has two input terminals (labeled 1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B) and one output terminal (labeled 1Y, 2Y, 3Y, 4Y).
The technical parameters take SN74LS32N as an example. SN74LS32N is manufactured by Texas Instruments, but the "SN" prefix is added to the model number. This prefix may represent some special feature or production batch. As for the "N" at the end, it may mean that the chip is packaged in DIP.
Logic gate structure: It contains four internal or gates, each OR Gate has two inputs and one output.
Logic operation: For each OR Gate, if any one input is high (logic 1), the output is high. The output is low only if all inputs are low (logic 0).
Inputs and outputs: Each input is connected to a logic level signal, which can be either high (usually corresponding to a positive supply voltage, e.g. 5V) or low (usually corresponding to ground, 0V). The outputs then generate the output signals of the logic gates.
Power connection: The 74LS32 chip usually needs to be connected to a positive supply (VCC) and ground (GND).
• Doorbell switch
• Computer network
• Oscillator circuits
• Basic logic circuits
• Data validation circuits
• Networks and digital systems
• Encoders and decoders
• Multiplexers and de-multiplexers
Before using the 74LS32, be sure to understand its usage details and precautions. The chip requires a DC power supply, so it should use a signal input that is also DC. The periodic waveforms generated by AC signals encompass an infinite range of frequency components, posing the potential for electrical shifts in chip pins that may result in logic gate failures. Therefore, when using this chip, we must follow the regulations to ensure the correct and stable operation of the circuit.
Frequently Asked Questions
1. What is a 74LS32?
The 74LS32 is a Dual Input OR Gate with Quad package. It contains four independent gates each of which performs the logic OR function. Each gate has two inputs that's why it is named Quad 2-Input OR Gate. It has 12 input output pins for a total of four OR gates.
2. What is the use of 74LS32?
It can be used in forming basic logic gate circuits, encoders and decoders, multiplexer and demultiplexer, and oscillator circuits. The 74LS32 is a Dual Input OR Gate with Quad package. It contains four independent gates each of which performs the logic OR function.
3. How many gates are there in a regular 74LS32 chip?
The 74LS32 is a dual input OR Gate with quad package. It contains four independent gates each of which performs the logic OR function. Each gate has two inputs that's why it is named quad 2-Input OR Gate.
4. What are logic gates used for?
Logic gates are an important concept if you are studying electronics. These are important digital devices that are mainly based on the Boolean function. Logic gates are used to carry out logical operations on single or multiple binary inputs and give one binary output.
5. How to use 74LS32?
To use the 74LS32 Logic gate IC, just power it using the Vcc and GND pins. The typical operating voltage of the IC is +5V, but it can also be operated in +7V. The output voltage of the IC on the pin Y will be equal to the operating voltage of the IC.
