Texas Instruments 4Q 2006 manual UARTs Universal Asynchronous Receiver/Transmitters

Page 16

16UARTs (Universal Asynchronous Receiver/Transmitters)

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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.

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

UART Family of Products

TL16C754B

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL16C554A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channels

 

 

 

 

 

 

TL16C2552

 

 

 

 

 

 

 

 

TL16C2752

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL16C2550

 

 

 

2

 

 

 

TL16C452

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL16C752B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL16C552A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL16C451

 

TL16C550D

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL16C450

 

TL16C550C

 

 

 

 

 

 

 

 

 

 

TL16C750

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TL16PC564B

TL16PIR552A

TIR1000

No FIFO

16-Byte

64-Byte

Special

 

FIFO Memory Size

 

Functions

 

 

 

Interface Selection Guide

Texas Instruments 4Q 2006

Page 15 Page 17
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Page 15 Page 17
Contents Interface Selection Guide Table of Contents Interface Selection GuideInterface Selection Guide Clock Distribution Circuits pLVDS, xECL, CML Design ConsiderationsTechnical Information Lvds Family of ProductsPecl Selection Guide Texas Instruments 4QLvds Selection Guide Supply Device Pin/Packages Price Single FamilyDual Family Quad FamilyLvds Features Multipoint-LVDS M-LVDSMultipoint Lvds Lvds Devices from TIHalf Part-toMbps Jitter To ensure signal integrity Key FeaturesDigital Isolators Digital Isolators Selection GuideRS-485/422 RS-485/422 Family of ProductsFeatures No. Dr/RxNodes Soic Flexible power-saving options enable longer battery life RS-232 RS232 IEC6100-4-2 Level ESD-Protected Devices Space-saving QFN package options for portable applicationsDrivers Receivers DevicePin/Packages Price RS-232 Selection Guide Pin/Package PriceProgrammable sleep mode and low-power mode UARTs Universal Asynchronous Receiver/TransmittersUart Family of Products 64-byte FIFOs available 3-, 2.5- and 1.8-V supplyUARTs Universal Asynchronous Receiver/Transmitters Uart Selection GuideAsynchronous Communications Element with Autoflow Control PDAs MP3 players Gaming systems Modems Serial ports TelecomCan 3.3-V and 5-V High-Speed can Transceivers Can Transceiver Selection GuideSelection Guide Standard Compliant ProtocolsFlatlink 3G FlatLinkTM 3G Display SerDes for Mobile PhonesFlatLink 3G Selection Guide 1755SerDes Solutions-Frontplane/Backplane SerDes Serial Gigabit Transceivers and LvdsBuffer PhotoSerDes Serial Gigabit Transceivers Selection Guide Gigabit Ethernet/FibreChannelGigabit Xaui Ethernet Lvds SerdesHigh Bandwidth Digital Content Protection Hdcp Content protection for video sent over DVI22 DVI/PanelBus Hdcp ElementsDigital visual interface DVI compliant Desktop LCD monitors DLP and LCD projectors Digital TVsSet-top boxes Intra-Pair ps Inter-Pair Clock P-P Data P-P JitterMax ps 40QFNUniversal Serial Bus USB SpeedTransfer Type USB-to-Serial BridgeUSB Family of Products USB Hub Controllers and Peripheral DevicesPackage USB Power Managers Family of Products Port USB Hub Power ControllersUniversal Serial Bus USB Power Managers USB Power Managers Selection GuideDevice PCI ExpressClassifications Key Benefits PCI ExpressTarget Markets Target Market ExpressCards PC Add-In Cards PC MotherboardsTX Block Painful and not robustRX Block PCI Bridges Two 32-bit, 33- or 66-MHz busesCapabilities FunctionalityCardBus Power Switches Power Distribution Devices Family of ProductsTransition Time Enable PredecessorIN1 to IN2 36 1394 FireWire Physical-Layer Selection IssuesLink-Layer Selection Issues Overview1394b Advantages Real-time streaming of audio and videoFaster speeds from 800 Mbps to 3200 Mbps More efficient Boss arbitrationFireWire Key Features ApplicationsSignal Integrity TI vs Competition Conn. Conn. Conn. Conn. Conn. ConnGtlp Gunning Transceiver Logic Plus Gtlp Selection GuideDevice Description Price Other LiteratureVME HighlightsClock Distribution Circuits SN65HVD3085E SN65HVD3082ECross-Reference Guide SN65HVD3088ECross-Reference Guide SN65LVDT3486BPericom SN65LVDT9637BDevice Index Texas InstrumentsInternet Product Information CentersImportant Notice
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