參數(shù)資料
型號: AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 129/153頁
文件大小: 838K
代理商: AM79C974
AMD
P R E L I M I N A R Y
129
Am79C974
Decoupling methods which are NOT recommended
include:
connecting a capacitor only between the V
DD
and
V
SS
planes so that it sits on the component side of
the board. This doesn’t allow the capacitor to re-
duce noise directly at the chip, but it does allow for
a reduction of power plane noise and of board
components. (capacitors).
connecting a capacitor only between the V
DD
and
V
SS
planes so that it sits on the solder side of the
board. This configuration also doesn’t allow direct
decoupling at the chip. It does save board space,
but it requires an extra manufacturing step.
TERMINATION CONSIDERATIONS
The use of active or regulated termination for termina-
tors on the motherboard is recommended (see Figure
E-6), while external SCSI terminators can be used to
terminate other parts of the SCSI bus. Terminators must
match the impedance seen by a signal at the end of the
SCSI bus to the characteristic impedance of the SCSI
bus. This impedance is typically 84 +/– 12
, but can
vary greatly with PC board characteristics and cabling.
V
IN
V
OUT
Low
Dropout
Voltage
Regulator
V adj
C1
10
μ
f
Alum. or
4.7
μ
f Tant.
15 V
R1
121
1%
1/4W
R2
154
1%
1/4W
C2
150
μ
f
Alum. or
22 μf Tant.
10 V
C3
.1
μ
f
Ceramic
25 V
R3-20 are
110
1%
R3-11
R12
R14
R15
R16
R17
R18
R19
R20
R13
TERMPWR
DB (0-7,P)
ATN
BSY
ACK
RST
MSG
SEL
C/D
REQ
I/O
2.85 V
18681A-68
Figure E-6. Regulated Termination
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