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SN74GTLPH16945KR Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce SN74GTLPH16945KR
Description  16-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
Download  13 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

SN74GTLPH16945KR Fiches technique(HTML) 9 Page - Texas Instruments

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SN74GTLPH16945
16-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES292D – OCTOBER 1999 – REVISED NOVEMBER 2001
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS
The preceding switching characteristics table shows the switching characteristics of the device into a lumped load
(Figure 1). However, the designer’s backplane application probably is a distributed load. The physical representation
is shown in Figure 2. This backplane, or distributed load, can be approximated closely to a resistor inductance
capacitance (RLC) circuit, as shown in Figure 3. This device has been designed for optimum performance in this RLC
circuit. The following switching characteristics table shows the switching characteristics of the device into the RLC
load, to help the designer better understand the performance of the GTLP device in this typical backplane. See
www.ti.com/sc/gtlp for more information.
Drvr
1.5 V
.25”
2”
1”
1”
1.5 V
1”
1”
2”
.25”
Rcvr
Rcvr
Rcvr
Figure 2. Medium-Drive Test Backplane
Slot 1
Slot 2
Slot 9
Slot 10
Conn.
Conn.
Conn.
Conn.
ZO = 70 Ω
From Output
Under Test
Test
Point
1.5 V
CL = 9 pF
19
LL = 19 nH
Figure 3. Medium-Drive RLC Network
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, VTT = 1.5 V and VREF = 1 V for GTLP (see Figure 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
TYP†
UNIT
tPLH
A
B
4.3
ns
tPHL
A
B
4.3
ns
ten
OE
B
5
ns
tdis
OE
B
4.4
ns
tr
Rise time, B outputs (20% to 80%)
1
ns
tf
Fall time, B outputs (80% to 20%)
2
ns
† All typical values are at VCC = 3.3 V, TA = 25°C. All values are derived from TI-SPICE models.


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