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. 625-8514
Mfr. Part No.Z0847006PSG
BrandZilog
SGD7.08
Each
units
2 UART - - - - Through Hole PDIP 40 - - - - -
RS Stock No. 173-0790
Mfr. Part No.XR20M1170IG16-F
BrandEXAR
SGD5.582
Each (In a Tube of 95)
units
1 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 16 1.6 → 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm 0.95mm
RS Stock No. 124-2427
Mfr. Part No.SCC2698BC1A84,512
BrandNXP
SGD47.667
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. 686-5963
Mfr. Part No.XR16C2850CM-F
BrandEXAR
SGD22.06
Each
units
2 IrDA 128B 128B 6.25Mbit/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. 484-1445
Mfr. Part No.SC28L92A1B,551
BrandNXP
SGD11.78
Each
units
2 - 16B 16B 0.23MBd - Surface Mount PQFP 44 2.97 → 5.5 V 10 x 10 x 1.75mm 10mm 10mm 1.75mm
RS Stock No. 162-7086
Mfr. Part No.TL16C554FNR
SGD17.37
Each (On a Reel of 250)
units
4 - 16B 16B 1MBd Yes Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 686-6001
Mfr. Part No.XR16L788IQ-F
BrandEXAR
SGD36.51
Each
units
8 IrDA 64B 64B 6.25Mbit/s Yes Surface Mount PQFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm 20.1mm 14.1mm 3.05mm
RS Stock No. 686-5951
Mfr. Part No.ST16C650ACQ48-F
BrandEXAR
SGD8.45
Each
units
1 IrDA 32B 32B 3.125Mbit/s Yes Surface Mount TQFP 48 2.9 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 811-2971
Mfr. Part No.XR28V382IL32-F
BrandEXAR
SGD5.00
Each
units
2 IrDA, RS232, RS485 128B 128B 3Mbit/s Yes Surface Mount QFN 32 3.3 V 5 x 5 x 0.95mm 5mm 5mm 0.95mm
RS Stock No. 700-4380
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
SGD10.46
Each
units
- - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 786-0907
Mfr. Part No.MAX14830ETM+
BrandMaxim
SGD20.99
Each
units
4 RS485 - - 24MBd - Surface Mount TQFN 48 2.35 → 3.6 V 7.1 x 7.1 x 0.75mm 7.1mm 7.1mm 0.75mm
RS Stock No. 686-6005
Mfr. Part No.XR17D152CM-F
BrandEXAR
SGD20.33
Each
units
2 RS232, RS422, RS485 64B 64B 6.25Mbit/s Yes Surface Mount TQFP 100 5 V 14.1 x 14.1 x 1.05mm 14.1mm 14.1mm 1.05mm
RS Stock No. 170-4451
Mfr. Part No.ST16C554CQ64-F
BrandEXAR
SGD15.831
Each (In a Tray of 160)
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm
RS Stock No. 170-4518
Mfr. Part No.XR88C681J-F
BrandEXAR
SGD12.999
Each (In a Tube of 27)
units
2 RS232, RS422, RS485 1B 3B 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 4.57mm 16.66mm 16.66mm 4.57mm
RS Stock No. 811-2974
Mfr. Part No.XR28V384IM48-F
BrandEXAR
SGD7.03
Each
units
4 IrDA, RS232, RS485 128B 128B 3Mbit/s Yes Surface Mount TQFP 48 3.3 V 7 x 7 x 1.05mm 7mm 7mm 1.05mm
RS Stock No. 146-1228
Mfr. Part No.Z0847006PSG
BrandZilog
SGD7.585
Each (In a Tube of 10)
units
2 UART - - - - Through Hole PDIP 40 - - - - -
RS Stock No. 622-7986
Mfr. Part No.MAX3100EEE+
BrandMaxim
SGD15.92
Each
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm 4.98mm 3.99mm 1.55mm
RS Stock No. 923-1584
Mfr. Part No.FT232HL-REEL
BrandFTDI Chip
SGD8.328
Each (On a Reel of 1500)
units
1 RS232, RS422, RS485 UART - - 12Mbit/s - Surface Mount LQFP 48 1.8 V, 3.3 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 923-1613
Mfr. Part No.FT231XQ-R
BrandFTDI Chip
SGD2.311
Each (On a Reel of 5000)
units
- - - - - - - - - - - - - -
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