UART and Bridging Solutions

Exar is an industry leader in providing UART products; we offer a variety of patented industry-proven product families of USB, I2C/SPI, VLIO, 8-bit, PCIe, and PCI UARTs. We also have top of the line bridging solutions including I2C GPIO Expanders and SPI GPIO Expanders.

UART Product Portfolio

Our Universal Asynchronous Receiver Transmitter (“UART”) product portfolio ranges from cost-effective industry-standard devices to high-performance multi-channel UARTs with a broad range of first in, first out (“FIFO”) depths and industry leading performance and features while supporting popular central processing unit (“CPU”) bus interfaces such as 8-bit Industry Standard Architecture (“ISA”), 8-bit VLIO, 2-wire Inter-Integrated Circuit (“I2C”), 4-wire Serial Peripheral Interface (“SPI”), Peripheral Component Interconnect (“PCI”), Peripheral Component Interconnect Express (“PCIe”) and Universal Serial Bus (“USB”). In addition, we were first to market with a wireless UART solution that includes a high-performance UART, controller, and Radio Frequency (“RF”) functionality along with our proprietary firmware that enables the application to send and receive data wirelessly over a secure proprietary protocol. Our General Purpose Input Output (“GPIO”) expanders provide a convenient drop-in replacement second source for popular industry devices.

If you have more questions about any Exar UART chip or bridging solutions, you can reach out to the Exar’s UART Technical Support group. Find the correct UART for your system with the answers from our technical advisors.

We want your systems to operate to their fullest potential. Let Exar help you understand what your system requirements might be and also determine what products, including UARTs, will best meet your needs.

UART & Bridging Solutions
 
 
 

USB 2.0
2
12/12/na/na
512/512
3.0-3.6, 4.4-5.25
QFN-40
USB 2.0
1
12/12/na/na
512/512
3.0-3.6, 4.4-5.25
QFN-28
USB 2.0
1
12/na/na/na
128/384
4.4 - 5.25
QFN-16
USB 2.0
1
12/12/na/na
512/512
3.0-3.6, 4.4-5.25
QFN-24, QFN-28
USB 2.0
4
12/12/na/na
512/512
3.0-3.6, 4.4-5.25
LQFP-64
USB 2.0
1
na/12/na/na
128/384
2.97 -3.63
QFN-16
USB 2.0
2
na/12/na/na
128/384
2.97 -3.63
QFN-32
USB 2.0
4
na/12/na/na
128/384
2.97 -3.63
TQFP-48
* recently added
USB Ethernet Bridges

USB 2.0
10/100
0
15
1024/1024
8
±15kV HBM
4.4 - 5.25
QFN-32
USB 2.0
10/100
1
15
1024/1024
8
±15kV HBM
4.4 - 5.25
QFN-32
USB 2.0
10/100
2
15
1024/1024
32
±15kV HBM
4.4 - 5.25
QFN-56
USB 2.0
10/100
4
15
1024/1024
32
±15kV HBM
4.4 - 5.25
QFN-56
I2C GPIO Expanders

I2C
8
1.65V - 3.6V
QFN-16, TSSOP-16
I2C
8
1.65V - 3.6V
QFN-16, TSSOP-16
I2C
16
1.65V - 3.6V
QFN-24, TSSOP-24
I2C
16
1.65V - 3.6V
QFN-24, TSSOP-24
I2C
8
1.65V - 3.6V
QFN-16, TSSOP-16
I2C
16
1.65V - 3.6V
QFN-24, TSSOP-24
I2C
8
1.65V - 3.6V
QFN-16, TSSOP-16
I2C
16
1.65V - 3.6V
QFN-24, TSSOP-24
SPI GPIO Expanders

SPI
8
1.65V - 3.6V
QFN-16, TSSOP-16
SPI
16
1.65V - 3.6V
QFN-24, TSSOP-24
SPI
8
1.65V - 3.6V
QFN-16, TSSOP-16
SPI
16
1.65V - 3.6V
QFN-24, TSSOP-24
PCI UARTs (66MHz)

PCI Bus 3.0
8
na/8/na/na
64/64
3.0-3.6
8
LQFP-144
PCI Bus 3.0
4
na/8/na/na
64/64
3.0-3.6
8
LQFP-144
PCI Bus 3.0
2
na/8/na/na
64/64
3.0-3.6
8
TQFP-100
PCI UARTs (Universal 3.3V or 5V)

8
PCI Bus 2.2
6.25/4/na/na
64/64
3.0-3.6, 4.5-5.5
8
LQFP-144
4
PCI Bus 2.2
6.25/4/na/na
64/64
3.0-3.6, 4.5-5.5
8
LQFP-144
2
PCI Bus 2.2
6.25/4/na/na
64/64
3.0-3.6, 4.5-5.5
8
TQFP-100
PCI UARTs (5V)

PCI Bus 2.2
8
6.25/na/na/na
64/64
3.0-3.6
8
LQFP-144
PCI Bus 2.2
4
6.25/na/na/na
64/64
3.0-3.6
8
LQFP-144
PCI Bus 2.2
2
6.25/na/na/na
64/64
3.0-3.6
8
TQFP-100
PCIe Bus (2.0 Gen 1)
8
na/25/na/na
256/256
Program/ Program
3.3
fpBGA-176
PCIe Bus (2.0 Gen 1)
4
na/25/na/na
256/256
Program/ Program
3.3
fpBGA-176
PCIe Bus (2.0 Gen 1)
2
na/25/na/na
256/256
Program/ Program
3.3
fpBGA-113
I2C/SPI UARTs

I2C/SPI
1
na/16/12.5/8
64/64
1.62-3.63
TSSOP-16, TSSOP-24, QFN-16, QFN-24, QFN-28
I2C/SPI
2
na/16/12.5/8
64/64
1.62-3.63
QFN-32, TSSOP-28
I2C/SPI
1
na/24/16/10
128/128
1.62-3.63
QFN-24, QFN-32 QFN-40
I2C/SPI
1
na/0.25/na/na
64/64
2.97-3.63
QFN-40
I2C/SPI
2
1/1/na/na
64/64
2.97-3.63
QFN-64
8-Bit/VLIO UARTs

Intel or Motorola
4
2/1.5/na/na
128/128
Program/ Program
2.97-5.5
PLCC-68, QFP-100, LQFP-64
Intel or Motorola
4
2/1.5/na/na
128/128
Program/ Program
2.97-5.5
LQFP-64
Intel
1
1.5/0.5/na/na
1/1
No/No
2.97-5.5
PLCC-28, TQFP-48
Intel
1
1.5/0.5/na/na
16/16
4 Levels/ 4 Levels
2.97-5.5
PLCC-28, TQFP-48
Intel
1
1.5/0.5/na/na
16/16
4 Levels/ 4 Levels
2.97-5.5
PLCC-28, TQFP-48
Intel
2
1.5/1/na/na
1/1
No/No
2.97-5.5
PDIP-40, PLCC-44, TQFP-48
Intel
2
4/1.8/na/na
16/16
No/ 4 Levels
2.97-5.5
PDIP-40, PLCC-44, TQFP-48
Intel
2
4/1.8/na/na
16/16
No/ 4 Levels
2.97-5.5
PLCC-44
Intel
1
1.5/0.5/na/na
1/1
No/No
2.97-5.5
PDIP-40, PLCC-44, TQFP-48
Intel
2
1.5/0.5/na/na
1/1
No/No
2.97-5.5
PLCC-68
Intel
2
1.5/0.5/na/na
1/1
No/No
2.97-5.5
PLCC-68
Intel or Motorola
4
1.5/0.5/na/na
1/1
No/No
2.97-5.5
PLCC-68
Intel
1
1.5/1/na/na
16/16
No/ 4 Levels
2.97-5.5
PDIP-40, PLCC-44, TQFP-48
Intel
2
1.5/0.5/na/na
16/16
No/ 4 Levels
2.97-5.5
PLCC-68
Intel
2
1.5/0.5/na/na
16/16
No/ 4 Levels
2.97-5.5
PLCC-68
Intel or Motorola
4
1.5/0.5/na/na
16/16
No/ 4 Levels
2.97-5.5
LQFP-64
Intel or Motorola
4
1.5/0.5/na/na
16/16
No/ 4 Levels
2.97-5.5
PLCC-68, LQFP-64
Intel
1
1.5/0.5/na/na
16/16
4 Levels/ 4 Levels
2.97-5.5
TQFP-48
Intel or PC COM Port
1
3.125/2/na/na
32/32
4 Levels/ 4 Levels
2.97-5.5
PLCC-44, TQFP-48
Intel or Motorola
4
1.5/0.5/na/na
64/64
4 Levels/ 4 Levels
2.97 - 5.5
PLCC-68, QFP-100, LQFP-64
Intel or Motorola
4
1.5/0.5/na/na
64/64
4 Levels/ 4 Levels
2.97-5.5
LQFP-64
Motorola
4
1.5/0.5/na/na
16/16
No/ 4 Levels
2.97-5.5
PLCC-68
Intel
n/a
5
PDIP-40, PLCC-44
Intel
n/a
5
PLCC-44, LQFP-64
Intel
n/a
5
PLCC-44
Intel
2
4/1.875/na/na
16/16
No/ 4 Levels
2.97-5.5
PLCC-44, TQFP-48
Intel
2
6.25/4/na/na
128/128
Program/ Program
2.97-5.5
PLCC-44 TQFP-48
Intel
2
3.125/2/na/na
128/128
Program/ Program
2.97-5.5
PLCC-44
Intel or PC COM Port
1
2.2/1.3/na/na
128/128
Program/ Program
2.97-5.5
PLCC-44, TQFP-48
Intel or Motorola
4
2/1.5/na/na
128/128
Program/ Program
2.97-5.5
QFP-100
Intel
2
1.5/1.2/1/na
1/1
No/No
2.25-5.5
PLCC-44, TQFP-48
Intel
2
3.125/1.875/1/na
16/16
No/ 4 Levels
2.25-5.5
PLCC-44, QFN-32, TQFP-48
Intel or Motorola
2
3.125/1.875/1/na
16/16
No/ 4 Levels
2.25-5.5
QFN-32, TQFP-48
Intel
2
3.125/1.875/1/na
16/16
No/ 4 Levels
2.25-5.5
PLCC-44, TQFP-48
Intel
2
6.25/4/3/na
64/64
Program/ Program
2.25-5.5
PLCC-44, TQFP-48
Intel or Motorola
2
6.25/4/3/na
64/64
Program/ Program
2.25-5.5
TQFP-48
Intel
2
6.25/4/3/na
64/64
Program/ Program
2.25-5.5
PLCC-44
Intel
1
3/2/1.5/na
16/16
4 Levels / 4 Levels
1.62-5.5
QFN-24, QFN-32
Intel or Motorola
1
3/2/1.5/na
16/16
4 Levels/ 4 Levels
2.25-5.5
QFN-24, QFN-28, QFN-32, TQFP-48
Intel or Motorola
1
3.125/2/1.5/na
32/32
4 Levels/ 4 Levels
2.25-5.5
TQFP-48
Intel or Motorola
4
6.25/4/na/na
64/64
Program/ Program
2.97-5.5
LQFP-64
Intel or Motorola
8
6.25/4/na/na
64/64
Program/ Program
2.97-5.5
QFP-100
Intel
2
na/16/12.5/8
16/16
4 Levels/ 4 Levels
1.62-3.63
TQFP-48, QFN-32
Intel or Motorola
2
na/16/12.5/8
16/16
4 Levels/ 4 Levels
1.62-3.63
TQFP-48, QFN-32
Intel
2
na/16/12.5/8
32/32
4 Levels/ 4 Levels
1.62-3.63
TQFP-48, QFN-32
Intel or Motorola
2
na/16/12.5/8
32/32
4 Levels/ 4 Levels
1.62-3.63
TQFP-48, QFN-32
Intel
2
na/8/6.25/4
64/64
Program/ Program
1.62-3.6
TQFP-48, QFN-32
Intel or Motorola
2
na/8/6.25/4
64/64
Program/ Program
1.62-3.6
TQFP-48
Intel
2
na/8/6.25/4
64/64
Program/ Program
1.62-3.6
PLCC-44, QFN-32
Intel or Motorola
4
na/4/3.125/2
16/16
No/ 4 Levels
1.62-3.63
PLCC-68, LQFP-64, QFN-48, LQFP-80
Intel
4
16/16
No/ 4 Levels
1.62-3.63
LQFP-64
Intel or Motorola
4
na/16/12.5/8
32/32
4 Levels/ 4 Levels
1.62-3.63
PLCC-68, LQFP-64, QFN-48, LQFP-80
Intel
4
na/16/12.5/8
32/32
4 Levels/ 4 Levels
1.62-3.63
LQFP-64
Intel
1
na/16/12.5/7.5
16/16
4 Levels / 4 Levels
1.62-3.63
QFN-24, QFN-32, BGA-25
Intel or Motorola
1
na/16/12.5/7.5
16/16
4 Levels / 4 Levels
1.62-3.63
QFN-32, BGA-25, TQFP-48
VLIO
1
na/20/16/10
16/16
4 Levels/ 4 Levels
1.62-3.63
BGA-25, QFN-24, QFN-32
Intel or Motorola
8
na/15/12.5/3.75
16/16
Program/ Program
1.62-3.63
QFP-100
Intel or Motorola
4
na/16/12.5/8
64/64
4 Levels/ 4 Levels
1.62-3.63
PLCC-68, LQFP-64, QFN-48, LQFP-80, QFP-100
Intel
4
na/16/12.5/8
64/64
4 Levels/ 4 Levels
1.62-3.63
LQFP-64
Intel
1
na/16/12.5/7.5
32/32
4 Levels / 4 Levels
1.62-3.63
QFN-24, QFN-32, BGA-25
Intel or Motorola
1
na/16/12.5/7.5
32/32
4 Levels / 4 Levels
1.62-3.63
QFN-32, TQFP-48, BGA-25
VLIO
1
na/20/16/10
32/32
4 Levels/ 4 Levels
1.62-3.63
BGA-25, QFN-24, QFN-32
Intel or Motorola
8
na/15/12.5/3.7
32/32
Program/ Program
1.62-3.63
QFP-100
Intel
2
64/64
4 Levels/ 4 Levels
1.62-3.63
TQFP-48, QFN-32
Intel
1
na/16/12.5/7.5
64/64
Program / Program
1.62-3.63
QFN-24, QFN-32, BGA-25
Intel or Motorola
1
na/16/12.5/7.5
64/64
Program/Program
1.62-3.63
QFN-32, TQFP-48, BGA-25
VLIO
1
na/20/16/10
64/64
Program/ Program
1.62-3.63
BGA-25, QFN-24, QFN-32
Intel/Motorola/VLIO
1
na/24/16/9
128/128
Program/ Program
1.62-3.63
QFN-32, QFN-40, TQFP-48
Intel
2
na/16/12.5/na
16/16
4 Levels/ 4 Levels
2.25-3.6
TQFP-48, QFN-32
Intel or Motorola
2
na/16/12.5/na
16/16
4 Levels/ 4 Levels
2.25-3.6
TQFP-48, QFN-32
Intel
2
na/16/12.5/na
16/16
4 Levels/ 4 Levels
2.25-3.6
PLCC-44, QFN-32
Intel
2
na/16/12.5/na
32/32
4 Levels/ 4 Levels
2.25-3.6
TQFP-48, QFN-32
Intel or Motorola
2
na/16/12.5/na
32/32
4 Levels/ 4 Levels
2.25-3.6
TQFP-48, QFN-32
Intel
2
na/16/12.5/na
32/32
4 Levels/ 4 Levels
2.25-3.6
PLCC-44, QFN-32
Intel
2
na/8/6.25/na
64/64
Program/ Program
2.25-3.6
TQFP-48, QFN-32
Intel or Motorola
2
na/8/6.25/na
64/64
Program/ Program
2.25-3.6
TQFP-48
Intel
2
na/8/6.25/na
64/64
Program/ Program
2.25-3.6
PLCC-44, QFN-32
Intel or Motorola
4
na/4/3.125/na
16/16
No/ 4 Levels
2.25-3.6
PLCC-68, LQFP-64, QFN-48, LQFP-80
Intel
4
na/4/3.125/na
16/16
No/ 4 Levels
2.25-3.6
LQFP-64
Intel or Motorola
4
na/16/12.5/na
32/32
4 Levels/ 4 Levels
2.25-3.6
PLCC-68, LQFP-64, QFN-48, LQFP-80
Intel
4
na/16/12.5/na
32/32
4 Levels/ 4 Levels
2.25-3.6
LQFP-64
Intel or Motorola
8
na/15/10/na
16/16
Program/ Program
2.25-3.6
QFP-100
Intel or Motorola
4
na/16/12.5/na
64/64
4 Levels/ 4 Levels
2.25-3.6
PLCC-68, LQFP-64, QFN-48, LQFP-80, QFP-100
Intel
4
na/16/12.5/na
64/64
4 Levels/ 4 Levels
2.25-3.6
LQFP-64
Intel or Motorola
8
na/15/10/na
32/32
Program/ Program
2.25-3.6
QFP-100
Intel or Motorola
4
na/8/6.25/na
64
Program/ Program
2.25-3.6
LQFP-64
Intel or Motorola
8
na/8/6.25/na
64/64
Program/ Program
2.25-3.6
QFP-100
Motorola
2
1/0.5/na/na
16/16
4 Levels/ 4 Levels
2.97-5.5
PLCC-44, LQFP-44
Motorola
2
1/na/na/na
1/3
No/No
5
CDIP-40, PDIP-40, PLCC-44
Motorola
2
1/0.5/na/na
8/8
4 Levels/ 4 Levels
2.97-5.5
PDIP-40, PLCC-44, LQFP-44
Motorola
2
na/16/12.5/8
64/64
4 Levels/ 4 Levels
1.62-3.63
TQFP-48, QFN-32
Intel or Motorola
4
1/na/na/na
3/3
No/No
5
PLCC-44, PLCC-68
Intel
2
1/0.5/na/na
16/16
4 Levels/ 4 Levels
2.97-5.5
PLCC-44, LQFP-44
Intel
2
1/na/na/na
1/3
No/No
5
CDIP-40, PDIP-28, PDIP-40, PLCC-44
Intel
2
1/0.5/na/na
8/8
4 Levels/ 4 Levels
2.97-5.5
PLCC-44, LQFP-44
Combo UARTs

Intel or Motorola
1
1/1
na/0.25/na/na
16/16
4 Levels/ 4 Levels
QFN-32
Intel or Motorola
2
2/2
1/1/na/na
64/64
QFN-48
Intel or Motorola
1
2/2
na/0.25/na/na
16/16
4 Levels/ 4 Levels
QFN-40
Intel or Motorola
2
4/4
1/1/na/na
64/64
QFN-48
Intel or Motorola
1
3/5
na/0.25/na/na
16/16
4 Levels/ 4 Levels
QFN-40
Intel or Motorola
2
6/10
1/1/na/na
64/64
QFN-64
Intel or Motorola
1
8/8/na/na
64
Program/ Program
QFN-40
Intel or Motorola
2
8/8/na/na
64
Program/ Program
QFN-48
Wireless UARTs

Parallel (8-bit), Serial, I2C Master
1
64/64
n/a
n/a / 1 / 1 / n/a
n/a
n/a
n/a
2.25-3.63V
QFN-48
I2C Slave
n/a
n/a
n/a
n/a
868-956MHz
n/a / 0.25 / 0.25 / n/a
-94dBm
-91dBm
-24-0dBm
2.2-3.6V
QFN-48