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1DIR

1A1

1A2

GND

1A3

1A4

GND

1A5

1A6

GND

1A7

1A8

GND

ERC

2A1

2A2

GND

2A3

2A4

GND

2A5

2A6

GND

2A7

2A8

2DIR

1OE

1B1

1B2

GND

1B3

1B4

GND

1B5

1B6

GND

1B7

1B8

2B1

2B2

GND

2B3

2B4

GND

2B5

2B6

GND

2B7

2B8

2OE

DESCRIPTION/ORDERING INFORMATION

SN74GTLPH1645

16-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVER

SCES290D – OCTOBER 1999 – REVISED JUNE 2005

•

Member of the Texas Instruments Widebus™

Family

•

TI-OPC™ Circuitry Limits Ringing on

Unevenly Loaded Backplanes

•

OEC™ Circuitry Improves Signal Integrity and

Reduces Electromagnetic Interference

•

Bidirectional Interface Between GTLP Signal

Levels and LVTTL Logic Levels

•

LVTTL Interfaces Are 5-V Tolerant

•

High-Drive GTLP Outputs (100 mA)

•

LVTTL Outputs (–24 mA/24 mA)

•

Variable Edge-Rate Control (ERC) Input

Selects GTLP Rise and Fall Times for Optimal

Data-Transfer Rate and Signal Integrity in

Distributed Loads

•

Live Insertion

•

Bus Hold on A-Port Data Inputs

•

High-Speed Switching Noise

•

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

The SN74GTLPH1645 is a high-drive, 16-bit bus transceiver that provides LVTTL-to-GTLP and GTLP-to-LVTTL

signal-level translation. It is partitioned as two 8-bit transceivers. The device provides a high-speed interface

between cards operating at LVTTL logic levels and a backplane operating at GTLP signal levels. High-speed

(about three times faster than standard LVTTL or TTL) backplane operation is a direct result of GTLP's reduced

output swing (<1 V), reduced input threshold levels, improved differential input, OEC™ circuitry, and TI-OPC™

circuitry. Improved GTLP OEC and TI-OPC circuits minimize bus-settling time and have been designed and

tested using several backplane models. The high drive allows incident-wave switching in heavily loaded

backplanes with equivalent load impedance down to 11

Ω.

GTLP is the Texas Instruments derivative of the Gunning Transceiver Logic (GTL) JEDEC standard JESD 8-3.

The ac specification of the SN74GTLPH1645 is given only at the preferred higher noise-margin GTLP, but the

Normally, the B port operates at GTLP signal levels. The A-port and control inputs operate at LVTTL logic levels,

reference voltage.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Widebus, TI-OPC, OEC are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.