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SN74GTLP1394DGV

更新时间： 2024-11-25 22:53:35
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德州仪器 - TI /
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描述
2-BIT LVTTL-TO-GTL ADJUSTABLE-EDGE-RATE BUS TRANSCEIVER WITH SELECTABLE POLARITY

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SN74GTLP1394DGV 数据手册

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SN74GTLP1394  
2-BIT LVTTL-TO-GTL+ ADJUSTABLE-EDGE-RATE BUS TRANSCEIVER  
WITH SELECTABLE POLARITY  
SCES286 – OCTOBER 1999  
D, DGV, OR PW PACKAGE  
Bidirectional Interface Between GTL+  
(TOP VIEW)  
Signal Levels and LVTTL Logic Levels  
LVTTL Interfaces Are 5-V Tolerant  
High-Drive GTL+ Outputs (100 mA)  
LVTTL Outputs (–24 mA/24 mA)  
OEBY  
Y1  
BIAS V  
GND  
B1  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
CC  
Y2  
V
GND  
B2  
CC  
Variable Edge-Rate Control (ERC) Input  
Selects GTL+ Rise and Fall Times for  
Optimal Data-Transfer Rate and Signal  
Integrity  
A1  
A2  
GND  
OEAB  
ERC  
V
REF  
T/C  
I
, Power-Up 3-State, and BIAS V  
CC  
off  
Support Live Insertion  
Polarity Control Selects True or  
Complementary Outputs  
Package Options Include Plastic  
Small-Outline (D), Thin Very Small-Outline  
(DGV), and Thin Shrink Small-Outline (PW)  
Packages  
description  
The SN74GTLP1394 is a high-drive 2-bit 3-wire bus transceiver that provides LVTTL-to-GTL+ and  
GTL+-to-LVTTL signal-level translation. It allows for transparent and inverted transparent modes of data  
transfer with separate LVTTL input and LVTTL output pins. The device provides a high-speed interface between  
cards operating at LVTTL logic levels and a backplane operating at GTL+ signal levels and is especially  
designed to work with the Texas Instruments TSB14C01A 1394 Backplane Physical-Layer Controller.  
High-speed (about two 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, and output  
edge control (OEC ). Improved GTLP OEC circuits minimize bus settling time and have been designed and  
tested using several backplane models. The high drive is suitable for driving double-terminated low-impedance  
backplanes using incident-wave switching.  
GTL+ is the Texas Instruments derivative of the Gunning transceiver logic (GTL) JEDEC standard JESD 8-3.  
The AC specification of the SN74GTLP1394 is given only at the preferred higher noise margin GTL+, but the  
user has the flexibility of using this device at either GTL (V = 1.2 V and V  
= 0.8 V) or GTL+ (V = 1.5 V  
TT  
REF  
TT  
and V  
= 1 V) signal levels.  
REF  
Normally, the B port operates at GTL or GTL+ levels. The A inputs, Y outputs, and control inputs are compatible  
with LVTTL logic levels and are 5-V tolerant. V is the reference input voltage for the B port.  
REF  
This device is fully specified for live-insertion applications using I , power-up 3-state, and BIAS V . The I  
off  
off  
CC  
circuitry disables the outputs, preventing damaging current backflow through the device when it is powered  
down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power  
down, which prevents driver conflict. The BIAS V  
circuitry precharges and preconditions the B-port  
CC  
input/output connections, preventing disturbance of active data on the backplane during card insertion or  
removal, and permits true live-insertion capability.  
High-drive GTLP backplane interface devices feature adjustable edge-rate control (ERC). Changing the ERC  
input voltage between GND and V  
optimize system data-transfer rate and signal integrity to the backplane load.  
adjusts the B-port output rise and fall times. This allows the designer to  
CC  
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.  
OEC is a trademark of Texas Instruments Incorporated.  
Copyright 1999, Texas Instruments Incorporated  
PRODUCT PREVIEW information concerns products in the formative or  
design phase of development. Characteristic data and other  
specifications are design goals. Texas Instruments reserves the right to  
change or discontinue these products without notice.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...9

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