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參數(shù)資料
| 型號： | AM486DE2 |
| 英文描述： | Am486DE2 Microprocessor Data Sheet |
| 中文描述： | Am486DE2微處理器數(shù)據(jù)表 |
| 文件頁數(shù)： | 39/52頁 |
| 文件大小： | 1242K |
| 代理商： | AM486DE2 |
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Am486DE2 Microprocessor
39
ELECTRICAL DATA
The following sections describe recommended electri-
cal connections for the Am486DE2 microprocessor, and
electrical specifications.
Power Connections
The Am486DE2 microprocessor has modest power re-
quirements. However, the high clock-frequency output
buffers can cause power surges as multiple output buff-
ers drive new signal levels simultaneously. For clean,
on-chip power distribution at high frequency, 23 V
CC
pins
and 28 V
SS
pins feed the microprocessor in the 168-pin
PGA package. The 208-lead SQFP package includes
53 V
CC
pins
and 38 V
SS
pins.
Power and ground connections must be made to all ex-
ternal V
CC
and V
SS
pins of the microprocessors. On a
circuit board, all V
CC
pins must connect to a V
CC
plane.
Likewise, all V
SS
pins must connect to a common GND
plane.
The Am486DE2 microprocessor requires only 3.3 V as
input power. Unlike other 3-V 486 processors, the
Am486DE2 microprocessor does notrequire a V
CC5
in-
put of 5 V to indicate the presence of 5-V I/O devices on
the system motherboard. For socket compatibility, this
pin is INC (Internal No Connect), allowing the
Am486DE2 CPU to operate in 3-V sockets in systems
that use 5-V I/O.
Power Decoupling Recommendations
Liberal decoupling capacitance should be placed near
the microprocessor. The microprocessor, driving its 32-
bit parallel address and data buses at high frequencies,
can cause transient power surges, particularly when
driving large capacitive loads.
Low-inductance capacitors and interconnects are rec-
ommended for best high-frequency electrical perfor-
mance. Inductance can be reduced by shortening circuit
board traces between the microprocessor and the de-
coupling capacitors. Capacitors designed specifically
for use with PGA packages are commercially available.
Other Connection Recommendations
For reliable operation, always connect unused inputs to
an appropriate signal level. Active Low inputs should be
connected to V
CC
through a pull-up resistor. Pull-ups in
the range of 20 k
are recommended. Active High in-
puts should be connected to GND.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| AM486DE2-66V8TGC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:8-Kbyte Write-Through Embedded Microprocessor |
| AM486DE2-66V8THC | 制造商:Advanced Micro Devices 功能描述:Microprocessor, 32 Bit, 208 Pin, Plastic, QFP |
| AM486DX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Am486DX - Am486DX Block Diagram |
| AM486DX/DX2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Am486DX/DX2 Hardware Reference Manual |
| AM486DX2 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Am5X86⑩ Microprocessor Family |
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