UART

UART stands for Universal Asynchronous Receiver-Transmitter. UART is a type of serial communication interface designed 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. Asynchronous is a type of serial communication where the interfaces at each end are not synchronised by a common clock signal.

These particular UART devices are stand-alone integrated circuits (ICs). However, you can also find UARTs within microcontrollers (MCUs), as they only require two wires for communication.

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).

Where is UART used?

  • Microcontroller based devices
  • GPS receivers
  • Bluetooth devices
  • Modems
  • Wireless communications

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.


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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. 686-5941
Mfr. Part No.ST16C554DCJ68-F
BrandMaxLinear
TWD347.00
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm - - -
RS Stock No. 686-5954
Mfr. Part No.ST16C554DIJ68-F
BrandMaxLinear
TWD407.00
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm - - -
RS Stock No. 686-5995
Mfr. Part No.XR16L788CQ-F
BrandMaxLinear
TWD1,330.00
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 - - -
RS Stock No. 913-4244
Mfr. Part No.XR16L788CQ-F
BrandMaxLinear
TWD1,171.80
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 - - -
RS Stock No. 913-4231
Mfr. Part No.ST16C550CJ44-F
BrandMaxLinear
TWD116.30
Each (In a Tube of 27)
units
1 RS232, RS422, RS485 16B 16B 1.5Mbit/s - Surface Mount PLCC 44 2.97 → 5.5 V 16.66 x 16.66 x 4.57mm - - -
RS Stock No. 913-4234
Mfr. Part No.ST16C554DCQ64-F
BrandMaxLinear
TWD258.10
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 - - -
RS Stock No. 686-5948
Mfr. Part No.ST16C554CQ64-F
BrandMaxLinear
TWD354.00
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 - - -
RS Stock No. 686-5932
Mfr. Part No.ST16C550IQ48-F
BrandMaxLinear
TWD182.00
Each
units
1 - 16B 16B 1.5Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm - - -
RS Stock No. 686-5957
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
TWD419.00
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 - - -
RS Stock No. 913-4222
Mfr. Part No.ST16C2552CJ44TR-F
BrandMaxLinear
TWD137.40
Each (On a Reel of 500)
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 - - -
RS Stock No. 913-4301
Mfr. Part No.ST16C654IQ64-F
BrandMaxLinear
TWD383.20
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 - - -
RS Stock No. 913-4250
Mfr. Part No.XR82C684CJ/44-F
BrandMaxLinear
TWD558.30
Each (In a Tube of 27)
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm - - -
RS Stock No. 913-4238
Mfr. Part No.ST16C554DIQ64-F
BrandMaxLinear
TWD287.30
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 - - -
RS Stock No. 686-6005
Mfr. Part No.XR17D152CM-F
BrandMaxLinear
TWD712.00
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 - - -
RS Stock No. 686-5888
Mfr. Part No.ST16C2550CQ48-F
BrandMaxLinear
TWD217.00
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 - - -
RS Stock No. 769-5605
Mfr. Part No.XR20M1170IG16-F
BrandMaxLinear
TWD122.00
Each (In a Pack of 2)
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 - - -
RS Stock No. 686-5945
Mfr. Part No.ST16C554DCQ64-F
BrandMaxLinear
TWD362.00
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 - - -
RS Stock No. 847-2908
Mfr. Part No.XR16C850CM-F
BrandMaxLinear
TWD392.00
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 - - -
RS Stock No. 778-0898
Mfr. Part No.XR16V554DIV-F
BrandMaxLinear
TWD420.00
Each
units
4 - 16B 16B 4Mbit/s - Surface Mount LQFP 64 2.25 → 3.6 V 10.1 x 10.1 x 1.45mm - - -
RS Stock No. 811-2971
Mfr. Part No.XR28V382IL32-F
BrandMaxLinear
TWD188.00
Each
units
2 IrDA, RS232, RS485 128B 128B 3Mbit/s Yes Surface Mount QFN 32 3.3 V 5 x 5 x 0.95mm - - -