Texas Instruments 4Q 2006 Signal Integrity TI vs Competition, Conn. Conn. Conn. Conn. Conn. Conn

Page 39

Design Considerations

Primary

GTLP (Gunning Transceiver Logic Plus)

39

 

 

 

➔

Speed — The speed of the GTLP family in parallel backplanes is 4x that of traditional logic. Optimized output edge-rate control (OEC™) circuitry allows clock frequencies in excess of 100 MHz in high-performance system backplane applications.

Voltage Range — The GTLP family operates at 3.3 V and with 5-V tolerant LVTTL inputs/ outputs and can operate in a mixed-voltage environment. GTLP acts as LVTTL -to-GTLP bi-directional translators with 5 V tolerance on the LVTTL port.

Drive — The GTLP family provides ±24-mA drive on the A-Port (LVTTL side) and the choice of medium (50 mA) or high (100 mA) drive on the B-Port (GTLP side). This offers flexibility in matching the device to backplane length, slot spacing and termination resistance.

Signal Integrity–TI-OPC™— Overshoot pro- tection circuitry was designed specifically for the GTLP family and incorporated into the GTLP outputs. TI-OPC actively clamps any overshoots that are caused by improperly terminated backplanes, unevenly distributed cards or empty slots. OEC on the rising and falling edge of the GTLP outputs reduces line reflections and extra EMI, improving overall signal integrity.

True Live Insertion — GTLP backplane drivers allow for Level 3 isolation and true live- insertion capability. Level 1 isolation, partial power-down: IOFF circuitry within the device prevents damage by limiting the current flowing from an energized bus when the device VCC goes to zero. Level 2 isolation, hot insertion: both IOFF and power-up 3-state (PU3S) circuitry allow insertion or removal of a board into a backplane without powering

down the host system and without suspending signaling. Level 3 isolation, live insertion: for live insertion both IOFF and PU3S circuitry are needed and the board I/Os must be precharged to mid-swing levels prior to connector insertion/ removal.

Secondary

Compatibility — GTLP provides an easy migration path from traditional backplane logic like ABT, FCT, LVT, ALVT, LVC and FB+.

Portfolio — TI offers the broadest GTLP portfolio in the industry, with both high-drive (100 mA) and medium-drive (50 mA) devices.

Packaging — TI offers GTLP in a low-profile, fine-pitch BGA package (LFBGA) and in a quad flat no-lead package (QFN) for higher performance and the ultimate reduction in board-space requirements.

Single Bit Representation of a Multipoint Parallel Backplane

VTT

 

 

 

 

 

 

 

VTT

22 Ω

0.25"

94".

94".

94".

94".

025".

22 Ω

 

 

 

 

 

 

 

 

Z0†

 

 

 

Conn. Conn. Conn. Conn. Conn. Conn.

 

 

 

1" Z0¥ 1"

1"

1"

1"

1"

 

 

 

 

Rcvr

Rcvr

Rcvr

Rcvr

Rcvr

 

 

 

Rcvr

 

 

 

 

 

 

 

 

Slot 1

Slot 2

Slot 3

Slot 18

Slot 19 Slot 20

 

 

†Unloaded backplane trace natural impedance (Z0) is 45 Ω to 60 Ω, with 60 Ω being ideal. ¥ Card stub natural impedance (Z0) is 60 Ω.

Signal Integrity: TI vs Competition

Volts

2

TI

Competitor A

1.5

1

0.5

0

1.98E-08

4.48E-08

6.98E-08

 

Time

 

Texas Instruments 4Q 2006

Interface Selection Guide

Page 38 Page 40
Image 39
Page 38 Page 40
Contents Interface Selection Guide Interface Selection Guide Table of ContentsClock Distribution Circuits p Interface Selection GuideLvds Family of Products LVDS, xECL, CMLDesign Considerations Technical InformationTexas Instruments 4Q Pecl Selection GuideLvds Selection Guide Quad Family SupplyDevice Pin/Packages Price Single Family Dual FamilyLvds Devices from TI Lvds FeaturesMultipoint-LVDS M-LVDS Multipoint LvdsPart-to HalfDigital Isolators Selection Guide Mbps Jitter To ensure signal integrityKey Features Digital IsolatorsRS-485/422 Family of Products RS-485/422Soic FeaturesNo. Dr/Rx NodesSpace-saving QFN package options for portable applications Flexible power-saving options enable longer battery lifeRS-232 RS232 IEC6100-4-2 Level ESD-Protected DevicesDevice Drivers ReceiversPin/Packages Price Pin/Package Price RS-232 Selection Guide64-byte FIFOs available 3-, 2.5- and 1.8-V supply Programmable sleep mode and low-power modeUARTs Universal Asynchronous Receiver/Transmitters Uart Family of ProductsPDAs MP3 players Gaming systems Modems Serial ports Telecom UARTs Universal Asynchronous Receiver/TransmittersUart Selection Guide Asynchronous Communications Element with Autoflow ControlStandard Compliant Protocols Can 3.3-V and 5-V High-Speed can TransceiversCan Transceiver Selection Guide Selection Guide1755 Flatlink 3GFlatLinkTM 3G Display SerDes for Mobile Phones FlatLink 3G Selection GuidePhoto SerDes Solutions-Frontplane/BackplaneSerDes Serial Gigabit Transceivers and Lvds BufferLvds Serdes SerDes Serial Gigabit Transceivers Selection GuideGigabit Ethernet/FibreChannel Gigabit Xaui EthernetHdcp Elements High Bandwidth Digital Content Protection HdcpContent protection for video sent over DVI 22 DVI/PanelBusDesktop LCD monitors DLP and LCD projectors Digital TVs Digital visual interface DVI compliantSet-top boxes 40QFN Intra-Pair ps Inter-Pair Clock P-P Data P-PJitter Max psUSB-to-Serial Bridge Universal Serial Bus USBSpeed Transfer TypeUSB Hub Controllers and Peripheral Devices USB Family of ProductsPackage Port USB Hub Power Controllers USB Power Managers Family of ProductsUSB Power Managers Selection Guide Universal Serial Bus USB Power ManagersPCI Express DeviceClassifications PCI Express Key BenefitsTarget Markets ExpressCards PC Add-In Cards PC Motherboards Target MarketPainful and not robust TX BlockRX Block Functionality PCI BridgesTwo 32-bit, 33- or 66-MHz buses CapabilitiesPower Distribution Devices Family of Products CardBus Power SwitchesEnable Predecessor Transition TimeIN1 to IN2 Overview 36 1394 FireWire Physical-Layer Selection Issues Link-Layer Selection IssuesMore efficient Boss arbitration 1394b AdvantagesReal-time streaming of audio and video Faster speeds from 800 Mbps to 3200 MbpsKey Features Applications FireWireConn. Conn. Conn. Conn. Conn. Conn Signal Integrity TI vs CompetitionOther Literature Gtlp Gunning Transceiver Logic PlusGtlp Selection Guide Device Description PriceHighlights VMEClock Distribution Circuits SN65HVD3082E SN65HVD3085ESN65HVD3088E Cross-Reference GuideSN65LVDT3486B Cross-Reference GuideSN65LVDT9637B PericomTexas Instruments Device IndexProduct Information Centers InternetImportant Notice
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