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. 190-1253
Mfr. Part No.MAX3100CEE+
SGD8.115
Each (In a Pack of 2)
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm - - -
RS Stock No. 190-1465
Mfr. Part No.MAX14830ETM+
SGD24.97
Each
units
4 RS485 - - 24MBd - Surface Mount TQFN 48 2.35 → 3.6 V 7.1 x 7.1 x 0.75mm - - -
RS Stock No. 190-1312
Mfr. Part No.MAX3100EEE+
SGD12.305
Each (In a Pack of 2)
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm - - -
RS Stock No. 189-7774
Mfr. Part No.MAX3107ETG+
SGD9.512
Each (In a Tube of 86)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount TQFN 24 2.35 → 3.6 V 3.6 x 3.6 x 0.75mm - - -
RS Stock No. 203-5826
Mfr. Part No.MAX17841BGUE/V+
SGD8.346
Each (In a Tube of 96)
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
RS Stock No. 190-1333
Mfr. Part No.MAX3107EAG+
SGD11.685
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount SSOP 24 2.35 → 3.6 V 8.33 x 5.38 x 1.78mm - - -
RS Stock No. 732-9140
Mfr. Part No.MAX3100CPD+
SGD11.13
Each
units
1 IrDA 16B 16B 0.23MBd - Through Hole PDIP 14 3.3 V, 5 V 19.43 x 7.87 x 4.45mm - - -
RS Stock No. 189-7770
Mfr. Part No.MAX3100CEE+
SGD7.196
Each (In a Tube of 100)
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm - - -
RS Stock No. 190-1375
Mfr. Part No.MAX3109ETJ+
SGD11.40
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 → 3.6 V 5.0 x 5.0 x 0.43mm - - -
RS Stock No. 189-7773
Mfr. Part No.MAX3107EAG+
SGD9.623
Each (In a Tube of 58)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount SSOP 24 2.35 → 3.6 V 8.33 x 5.38 x 1.78mm - - -
RS Stock No. 190-7271
Mfr. Part No.MAX3100CEE+T
SGD8.30
Each
units
- - - - - - - - - - - - - -
RS Stock No. 165-9400
Mfr. Part No.MAX3140CEI+
SGD10.271
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 - - -
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 - - -
RS Stock No. 786-1001
Mfr. Part No.MAX3140CEI+
SGD11.31
Each
units
1 RS422, RS485 - - 230kBd - Surface Mount QSOP 28 4.75 → 5.25 V 9.98 x 3.99 x 1.5mm - - -
RS Stock No. 799-2849
Mfr. Part No.MAX3109ETJ+
SGD11.14
Each
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 to 3.6 V 5.0 x 5.0 x 0.43mm - - -
RS Stock No. 165-9559
Mfr. Part No.MAX3109ETJ+
SGD10.108
Each (In a Tube of 60)
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 → 3.6 V 5.0 x 5.0 x 0.43mm - - -
RS Stock No. 190-6193
Mfr. Part No.MAX3100CEE+T
SGD7.745
Each (On a Reel of 2500)
units
1 IrDA, RS232, RS485 - - - - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.65mm - - -
RS Stock No. 190-1351
Mfr. Part No.MAX3107ETG+
SGD11.525
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount TQFN 24 2.35 → 3.6 V 3.6 x 3.6 x 0.75mm - - -
RS Stock No. 203-5827
Mfr. Part No.MAX17841BGUE/V+
SGD11.72
Each
units
1 UART - - 2Mbps - - TSSOP 16 3.1 → 3.5 V - - - -
RS Stock No. 189-7772
Mfr. Part No.MAX3100EEE+
SGD10.033
Each (In a Tube of 100)
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm - - -