參數(shù)資料
型號(hào)： SN74GTLPH16912VR
廠(chǎng)商： Texas Instruments, Inc.
元件分類(lèi)： 通用總線(xiàn)功能
英文描述： CAP
中文描述： 18位LVTTL至GTLP通用總線(xiàn)收發(fā)器
文件頁(yè)數(shù)： 11/14頁(yè)
文件大?。?/td> 218K
代理商： SN74GTLPH16912VR
SN74GTLPH16912
18-BIT LVTTL-TO-GTLP UNIVERSAL BUS TRANSCEIVER
SCES288C
–
OCTOBER 1999
–
REVISED JULY 2001
11
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
3
3
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, V
TT
= 1.5 V and V
REF
= 1 V for GTLP (see Figure 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
TYP
UNIT
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
ten
tdis
tr
tf
A
B
4.5
ns
4.5
LEAB
B
4.7
ns
4.7
CLKAB
B
4.7
ns
4.7
OEAB
B
4.8
ns
4.4
Rise time, B outputs (20% to 80%)
1.2
ns
Fall time, B outputs (80% to 20%)
2.5
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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