Interface Selection Guide
Texas Instruments 4Q 2006
Key Features
• Single-, dual- and quad-channel devices
• 16- and 64-byte FIFOs available
• 5-, 3.3-, 2.5- and 1.8-V supply
• Clock rates up to 24/20/16-MHz for
1.5/1.25/1.0-Mbps data transfer rates
• Hardware and software autoflow control
• Programmable sleep mode and
low-power mode
• Industrial temperature characterization
Design Considerations
The UART is a key component of an
asynchronous serial communications system.
For example, all internal modems have their
own UARTs. In this application, parallel data
within the computer is converted by the
UART to serial data before being transferred
to the modem. In addition to PC/peripheral
communication, UARTs can be used for
chip-to-chip communications.
As data transfer speeds have increased to
support applications such as telecommunica-
tion base stations, cell phones, PCs, fax
servers and rack modems, the transmission
rate of the UART has become critical to
preventing system bottlenecks. When a fast
external modem is used, designers should be
sure the computer’s UART can handle the
modem’s maximum transmission rate. For
example, the TL16C550D UART contains a
16-byte buffer, enabling it to support higher
sustained transmission rates than the older
8250 UART. To reduce software buffering
and data overruns, TI has added its patented
hardware autoflow control to all new
designs and most existing UARTs. Most
UARTs allow the divisor to be programmed
from 1 to 65,535 and sometimes with an
added predivisor factor of 1, 4, 16 or 64.
To accommodate the requirements of diverse
applications, TI offers a wide portfolio of
parallel-to-serial and serial-to-parallel UARTs
in highly integrated, space-saving configura-
tions that allow designers to increase system
performance while decreasing space
requirements.
As one of the world’s leading high-volume
semiconductor manufacturers, TI offers
designers and OEMs the satisfaction of
knowing they are backed by a supplier with
the resources to meet their needs. These
include a dedicated marketing and technical
support team to assist with any issues.
TL16C451
TL16C452
TL16C752B
TL16C2752
TL16C750
TL16PIR552A
TIR1000
TL16PC564B
TL16C754B
TL16C554A
TL16C2550
TL16C2552
TL16C552A
TL16C550D
TL16C550C
TL16C450
1
2
4
No FIFO
16-Byte
64-Byte
Special
Functions
FIFO Memory Size
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UART Family of Products
16
UARTs (Universal Asynchronous Receiver/Transmitters)
➔
