What is difference between parallel and serial interface
1 Answer

Serial Interface v/s Parallel Interface

Sr. No. Parameters Serial Interface Parallel Interface
1. Main Concept One bit at a time. Multiple bits at a time.
2. Components Serial interface consists of an I2C bus, SPI bus, or synchronous serial control and data lines. Parallel interface consists of 8 data pins and 3 control lines.
3. Cost It requires fewer pins and is easy to set up hence the cost is comparatively less. It requires more pins and is not easy to set up hence the cost is comparatively high.
4. Purpose Parallel is an external interface used for connecting computer peripherals such as printers, or any other device that requires relatively high bandwidth, to a PC. Serial interface used for connecting serial lines to facilitate serial communication.
5. Transmission In serial interface bits of data are sent one at a time in a single stream of 1s and 0s along a single wire. Parallel interface can move a set of 8 bits (1s and 0s) of data in parallel at the same time along 8 separate wires meaning multiple bits of data are sent simultaneously.
6. Speed Transmission speed is Low. Transmission speed is High.
7. Number of Wires Less number of wires are used in serial interface. More wires are used in parallel interface.
8. Data Sending Mechanism A serial interface sends data bit by bit after sending a bit at a time. A parallel interface sends data by sending multiple bits in a parallel fashion.
9. Capability A serial interface can transmit a single stream of data at a time. A parallel interface can transmit multiple data streams at a time.
10. Port Type A serial interface uses Male ports. A parallel interface uses Female ports.
11. Redundancy Bottom-Up model is better suited as it ensures minimum data redundancy and focus is on re-usability. Top-down model has a high ratio of redundancy as the size of the project increases.
12. Applications Modems, security cameras, device controllers, GPS Receivers, Telescopes, Power Inverters, and Flat-Screen Monitors use serial ports. Printers, Hard Drives, CD drives, Scanners, External CD-ROM, and Optical Drivers use parallel ports.
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