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參數(shù)資料
| 型號： | VMEH22501A |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 8-BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1-BIT BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3-STATE OUTPUTS |
| 中文描述： | 8位通用總線收發(fā)器和兩個1位總線收發(fā)器與劈開LVTTL港口，反饋路徑，以及三態(tài)輸出 |
| 文件頁數(shù)： | 14/30頁 |
| 文件大小： | 568K |
| 代理商： | VMEH22501A |
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SCES620 – DECEMBER 2004
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS
The preceding switching characteristics tables show the switching characteristics of the device into the lumped load
shown in the parameter measurement information (PMI) (see Figures 1 and 2). All logic devices currently are tested
into this type of load. However, the designer’s backplane application probably is a distributed load. For this reason,
this device has been designed for optimum performance in the VME64x backplane as shown in Figure 3.
5 V
0.42”
0.84”
1.5”
1.5”
1.5”
1.5”
0.84”
0.42”
Rcvr
Rcvr
Rcvr
Slot 2
Slot 3
Slot 19
Slot 20
Conn.
Conn.
Conn.
Conn.
1.5”
Rcvr
Slot 1
Conn.
0.42”
Drvr
1.5”
Slot 21
Conn.
0.42”
330
470
ZO
5 V
330
470
ZO
Unloaded backplane trace natural impedence (ZO) is 45
.
45
to 60
is allowed, with 50
being ideal.
Card stub natural impedence (ZO) is 60
.
Rcvr
Figure 3. VME64x Backplane
The following switching characteristics tables derived from TI-SPICE models show the switching characteristics of
the device into the backplane under full and minimum loading conditions, to help the designer better understand the
performance of the VME device in this typical backplane. See www.ti.com/sc/etl for more information.
driver in slot 11, with receiver cards in all other slots (full load)
switching characteristics over recommended operating conditions for bus transceiver function
(unless otherwise noted) (see Figure 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN
TYP§
MAX
UNIT
tPLH
tPHL
tf
1A or 2A
1B or 2B
5.9
8.5
ns
5.5
8.7
Transition time, B port (10%90%)
9
8.6
11.4
ns
Transition time, B port (90%10%)
8.9
9
10.8
ns
§All typical values are at VCC = 3.3 V, TA = 25
°
C. All values are derived from TI-SPICE models.
All tr and tf times are taken at the first receiver.
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