Universal Asynchronous Receivers & Transmitters

Universal Asynchronous Receiver-Transmitter, more commonly referred to as UART, is a type of serial communication interface. UART’s primary function is to transmit and receive data via a data bus. It allows two devices, such as computers, to carry out data transmission over a wired connection. UARTs convert incoming and outgoing data bytes into a serial bit stream.


These particular UARTs are stand-alone integrated circuits (ICs). However, you can also find UARTs within microcontrollers (MCUs).


UART ICs (integrated circuits) are semiconductor devices which can be integrated into your electronics designs to enable UART communication. UART is a popular method of communication in electronics projects. It enables computer hardware to communicate with other modems and serial devices.


When choosing a UART IC, ensure that it meets the requirements of the modem transmission rate.



What does a UART consist of?


One side of the UART feature around 8 data lines and the control pins. The other side of the UART has two serial wires, the Transmission (TX) and the Receiving (RX).



Communication Standards


UARTs may feature a communication standard which defines the signals between devices. These standards include RS-232, RS-422 and RS-485.



What is baud rate?


UART baud rate is the speed at which the data is transferred which is given in bits per second (bit/s or bps). The devices that you are communicating between should both have the same baud rate.



What does Asynchronous mean?


Asynchronous is a type of serial communication where the interfaces at each end are not synchronised by a common clock signal.



What is USART?


USART is very similar in functionality to a UART device. However, it also offers the possibility of a “synchronous” mode.


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Description Price Number of Channels per Chip Standard Supported Transmit FIFO Receive FIFO Maximum Data Rate Transmitter and Receiver FIFO Counter Mounting Type Package Type Pin Count Typical Operating Supply Voltage Dimensions Length Width Height
RS Stock No. 725-8843
Mfr. Part No.SC16C550BIB48,128
BrandNXP
SGD3.91
Each
units
1 UART 16B 16B 3Mbit/s - Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 686-5890
Mfr. Part No.ST16C2550IQ48-F
BrandEXAR
SGD8.12
Each
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 700-4374
Mfr. Part No.XR17V358IB176-F
BrandEXAR
SGD25.04
Each
units
8 IrDA 256B 256B 25Mbit/s Yes Surface Mount FBGA 176 3.3 V 13.1 x 13.1 x 1.15mm 13.1mm 13.1mm 1.15mm
RS Stock No. 170-4466
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
SGD5.97
Each (In a Tray of 490)
units
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 124-2427
Mfr. Part No.SCC2698BC1A84,512
BrandNXP
SGD43.704
Each (In a Tube of 15)
units
8 - - - 0.115MBd - Surface Mount PLCC 84 5 V 29.41 x 29.41 x 4.06mm 29.41mm 29.41mm 4.06mm
RS Stock No. 923-1613
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
SGD2.311
Each (On a Reel of 5000)
units
- - - - - - - - - - - - - -
RS Stock No. 531-2500
Mfr. Part No.TL16C552AFN
SGD9.50
Each
units
2 - 16B 16B 1MBd - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 170-4448
Mfr. Part No.ST16C552CJ68-F
BrandEXAR
SGD9.847
Each (In a Tube of 19)
units
2 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
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