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SN54GTL16612AWD

更新时间： 2024-11-20 22:11:27
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德州仪器 - TI 总线收发器
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15页 256K
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18-BIT LVTTL-TO-GTL UNIVERSAL BUS TRANSCEIVERS

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SN54GTL16612A, SN74GTL16612A  
18-BIT LVTTL-TO-GTL+ UNIVERSAL BUS TRANSCEIVERS  
www.ti.com  
SCES187D–JANUARY 1999–REVISED JULY 2005  
FEATURES  
•
•
•
Bus Hold on A-Port Inputs Eliminates the  
Need for External Pullup/Pulldown Resistors  
•
Members of the Texas Instruments Widebus™  
Family  
Distributed VCC and GND-Pin Configuration  
Minimizes High-Speed Switching Noise  
•
Universal Bus Transceiver (UBT™) Combines  
D-Type Latches and D-Type Flip-Flops for  
Operation in Transparent, Latched, Clocked,  
or Clock-Enabled Modes  
ESD Protection Exceeds JESD 22  
– 2000-V Human-Body Model (A114-A)  
– 200-V Machine Model (A115-A)  
•
•
•
•
Translate Between GTL/GTL+ Signal Levels  
and LVTTL Logic Levels  
– 1000-V Charged-Device Model (C101)  
•
•
Latch-Up Performance Exceeds 100 mA Per  
JESD 78, Class II  
Support Mixed-Mode (3.3-V and 5-V) Signal  
Operation on A-Port and Control Inputs  
Package Options Include Plastic Shrink  
Small-Outline (DL), Thin Shrink Small-Outline  
(DGG), and Ceramic Flat (WD) Packages  
xxx  
B-Port Transition Time Optimized for  
Distributed Backplane Loads  
Ioff Supports Partial-Power-Down Mode  
Operation  
DESCRIPTION  
The 'GTL16612A devices are 18-bit universal bus transceivers (UBT) that provide LVTTL-to-GTL+ and  
GTL+-to-LVTTL signal-level translation. They allow for transparent, latched, clocked, or clock-enabled modes of  
data transfer. These devices provide a high-speed interface between cards operating at LVTTL logic levels and  
backplanes operating at GTL+ signal levels. High-speed (about two times faster than standard LVTTL or TTL)  
backplane operation is a direct result of the reduced output swing (<1 V), reduced input threshold levels, and  
output edge control (OEC™). Improved GTL+ OEC circuits minimize bus settling time and have been designed  
and tested using several backplane models.  
Figure 1 shows actual device output waveforms using a synchronous clock at 75 MHz. The test backplane is a  
16-slot, 14-inch board with loaded impedance of 33 Ω. VTT is 1.5 V, VREF is 1 V, and RTT pullup resistor is 50 Ω.  
The driver is in slot 8, with receivers in alternate slots 1, 3, 5, 7, 10, 12, 14, and 16. Receiver slot-1 signals are  
shown. The signal becomes progressively worse as the receiver moves closer to the driver or the spacing  
between receiver cards is reduced. The clock is independent of the data, and the system clock frequency is  
limited by the backplane flight time to about 80-90 MHz. This frequency can be increased even more (30% to  
40%) if the clock is generated and transmitted together with the data from the driver card (source synchronous).  
V
TT  
V
TT  
1.8  
TI GTL16612  
0.25”  
0.25”  
0.875”  
0.625”  
1.6  
1.4  
1.2  
Fairchild GTLP16612  
0.625”  
0.625”  
Conn.  
0.625”  
Conn.  
Conn.  
Conn.  
1.0  
0.8  
0.6  
0.4  
TI GTL16612A  
1”  
1”  
1”  
1”  
Rcvr  
Rcvr  
Rcvr  
Drvr  
Slot 8  
0
10  
20  
30  
t − Time − ns  
Slot 1  
Slot 2  
Slot 16  
Figure 1. Test Backplane Model With Output Waveform Results  
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, UBT, OEC, TI are trademarks of Texas Instruments.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 1999–2005, Texas Instruments Incorporated  
On products compliant to MIL-PRF-38535, all parameters are  
tested unless otherwise noted. On all other products, production  
processing does not necessarily include testing of all parameters.  
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