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. 170-4537
Mfr. Part No.ST16C1550CJ28-F
BrandEXAR
SGD6.312
Each (In a Tube of 38)
units
1 RS232, RS422, RS485 16B 16B 1.5Mbit/s - Surface Mount PLCC 28 2.97 → 5.5 V 11.58 x 11.58 x 4.57mm 11.58mm 11.58mm 4.57mm
RS Stock No. 170-4516
Mfr. Part No.XR20M1172IG28-F
BrandEXAR
SGD7.26
Each (In a Tube of 50)
units
2 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 28 1.6 → 3.6 V 9.8 x 4.5 x 1.05mm 9.8mm 4.5mm 1.05mm
RS Stock No. 646-6327
Mfr. Part No.PC16552DV/NOPB
SGD15.40
Each
units
2 - 16B 16B 1.5MBd Yes Surface Mount PLCC 44 5 V 16.51 x 16.51 x 3.68mm 16.51mm 16.51mm 3.68mm
RS Stock No. 913-4234
Mfr. Part No.ST16C554DCQ64-F
BrandEXAR
SGD10.93
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. 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. 913-4244
Mfr. Part No.XR16L788CQ-F
BrandEXAR
SGD35.111
Each (In a Tray of 66)
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. 170-4580
Mfr. Part No.XR16C850CM-F
BrandEXAR
SGD11.539
Each (In a Tray of 250)
units
1 IrDA, RS232, RS422, RS485 - - 2Mbit/s Yes Surface Mount TQFP 48 3.3 V, 5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 847-2901
Mfr. Part No.XR16L2750CM-F
BrandEXAR
SGD9.56
Each
units
2 IrDA, RS422, RS485 - - 6.25Mbit/s Yes Surface Mount TQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 847-2908
Mfr. Part No.XR16C850CM-F
BrandEXAR
SGD16.13
Each
units
1 IrDA, RS232, RS422, RS485 - - 2Mbit/s Yes Surface Mount TQFP 48 3.3 V, 5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
RS Stock No. 725-8846
Mfr. Part No.SC16IS752IPW,112
BrandNXP
SGD5.71
Each
units
2 IrDA 64B 64B 5Mbit/s - Surface Mount TSSOP 28 2.5 V, 3.3 V 9.8 x 4.5 x 0.75mm 9.8mm 4.5mm 0.75mm
RS Stock No. 921-5829
Mfr. Part No.HD3-6402R-9Z
SGD30.80
Each
units
1 - - - 125kBd - Through Hole PDIP 40 5 V 53.2 x 14.73 x 4.95mm 53.2mm 14.73mm 4.95mm
RS Stock No. 170-4458
Mfr. Part No.XR82C684CJ-F
BrandEXAR
SGD20.328
Each (In a Tube of 19)
units
4 UART - - 1Mbit/s - Surface Mount PLCC 68 5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
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. 733-6381
Mfr. Part No.XR16M890IL32-F
BrandEXAR
SGD4.74
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. 686-6055
Mfr. Part No.XR82C684CJ/44-F
BrandEXAR
SGD23.08
Each
units
4 - - - 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. 622-7964
Mfr. Part No.MAX3100CEE+
SGD9.85
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. 165-9400
Mfr. Part No.MAX3140CEI+
SGD17.337
Each (In a Tube of 50)
units
1 RS422, RS485 - - 230kBd - Surface Mount QSOP 28 4.75 → 5.25 V 9.98 x 3.99 x 1.5mm 9.98mm 3.99mm 1.5mm
RS Stock No. 888-8729
Mfr. Part No.FT231XQ-T
BrandFTDI Chip
SGD2.249
Each (In a Pack of 10)
units
- - - - - - Surface Mount QFN 20 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
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. 662-3946
Mfr. Part No.TL16C554FNR
SGD15.70
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
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