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. 484-1445
Mfr. Part No.SC28L92A1B,551
BrandNXP
MYR41.31
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. 146-1228
Mfr. Part No.Z0847006PSG
BrandZilog
MYR22.984
Each (In a Tube of 10)
units
2 UART - - - - Through Hole PDIP 40 - - - - -
RS Stock No. 733-6381
Mfr. Part No.XR16M890IL32-F
BrandEXAR
MYR15.81
Each
units
1 RS232, RS422, RS485 UART 128B 128B 24Mbit/s Yes Surface Mount QFN 32 1.8 V, 2.5 V, 3.3 V 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 545-8044
Mfr. Part No.TL16C554IFN
MYR54.82
Each
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. 170-4514
Mfr. Part No.ST16C654IJ68-F
BrandEXAR
MYR58.41
Each (In a Tube of 19)
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 5.08mm 24.33mm 24.33mm 5.08mm
RS Stock No. 662-5295
Mfr. Part No.TL16C2550PFB
MYR22.04
Each
units
2 - 16B 16B 1.5MBd Yes Surface Mount TQFP 48 5 V 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 913-4216
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
MYR21.693
Each (In a Tube of 27)
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount PLCC 44 2.97 → 5.5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 686-6067
Mfr. Part No.XR88C681CJ-F
BrandEXAR
MYR31.68
Each
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 757-0023
Mfr. Part No.FT201XS-R
BrandFTDI Chip
MYR8.34
Each (In a Pack of 2)
units
1 SIE, UART 512B 512B 3.4Mbit/s Yes Surface Mount SSOP 16 5 V 0.197 x 0.157 x 0.059in 5mm 0.157in 1.5mm
RS Stock No. 622-7964
Mfr. Part No.MAX3100CEE+
BrandMaxim
MYR21.39
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. 546-1472
Mfr. Part No.TL16C552FN
MYR42.63
Each
units
2 - 16B 16B 1Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 162-7082
Mfr. Part No.TL16C452FNR
MYR16.07
Each (On a Reel of 250)
units
2 - - - 0.256Mbit/s - Surface Mount PLCC 68 5 V 24.23 x 24.23 x 4.06mm 24.23mm 24.23mm 4.06mm
RS Stock No. 923-1597
Mfr. Part No.FT230XQ-R
BrandFTDI Chip
MYR7.565
Each (On a Reel of 5000)
units
1 RS232, RS422, RS485, SIE, UART 512B 512B 3MBd Yes Surface Mount QFN 16 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 170-4513
Mfr. Part No.ST16C654DIQ64-F
BrandEXAR
MYR50.391
Each (In a Tray of 160)
units
4 IrDA, RS232, RS422, RS485 64B 64B 1.5Mbit/s - Surface Mount LQFP 64 2.97 → 5.5 V 10 x 10 x 1.4mm 10mm 10mm 1.4mm
RS Stock No. 797-4737
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
MYR25.38
Each
units
2 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.6mm 7.1mm 7.1mm 1.6mm
RS Stock No. 686-5884
Mfr. Part No.ST16C2550CJ44-F
BrandEXAR
MYR23.39
Each
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount PLCC 44 2.97 → 5.5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 769-5620
Mfr. Part No.XR88C681J-F
BrandEXAR
MYR39.06
Each
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. 700-4371
Mfr. Part No.XR21V1412IL32-F
BrandEXAR
MYR20.06
Each
units
- - - - - - Surface Mount QFN 32 - 5 x 5 x 0.88mm 5mm 5mm 0.88mm
RS Stock No. 170-4469
Mfr. Part No.XR21V1414IM48-F
BrandEXAR
MYR33.571
Each (In a Tray of 250)
units
- - - - - - Surface Mount TQFP 48 - 7 x 7 x 1mm 7mm 7mm 1mm
RS Stock No. 686-5948
Mfr. Part No.ST16C554CQ64-F
BrandEXAR
MYR38.77
Each
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
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