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| 型号： | Enhanced Am486 dx2 |
| 厂商： | Advanced Micro Devices, Inc. |
| 英文描述： | High-Performance Design On-Chip Integration Complete 32-Bit Architecture Micrprocessor(高性能单片32位微处理器) |
| 中文描述： | 高性能设计的片上集成完整的32位架构Micrprocessor（高性能单片32位微处理器） |
| 文件页数： | 57/69页 |
| 文件大小： | 1068K |
| 代理商： | ENHANCED AM486 DX2 |
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Enhanced Am486 Microprocessor
AMD
57
PRELIMINARY
11
The following sections describe recommended electri-
cal connections for the Enhanced Am486 microproces-
sors and electrical specifications.
Electrical Data
11.1 Power and Grounding
11.1.1 Power Connections
Enhanced Am486 microprocessors have modest power
requirements. 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-pin SQFP package includes 53
V
CC
pins and 38 V
SS
pins.
Power and ground connections must be made to all
external 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 Enhanced Am486 microprocessor family requires
only 3.3 V as input power. Unlike other 3-V 486 proces-
sors, the Enhanced Am486 microprocessor family does
require a V
CC5
input of 5 V to indicate the presence of
5-V I/O devices on the system motherboard. For socket
compatibility, this pin is INC, allowing the Enhanced
Am486 CPU to operate in 3-V sockets in systems that
use 5-V I/O.
11.1.2 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.
11.1.3 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.
相关PDF资料 |
PDF描述 |
|---|---|
| Enhanced Am486 dx4 | High-Performance Design On-Chip Integration Complete 32-Bit Architecture Micrprocessor(高性能设计片上集成完全32位体系微处理器) |
| EO12 | IRDA INFRARED TRANSCEIVER |
| EOL-62L256 | HT62L256 EOL Notification |
| EP05FA20 | FRD |
| EP05Q03L | SBD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ENHSAURR8 | 制造商:Molex 功能描述:8 PORT MACHINE MOUNT SWITCH 制造商:Molex 功能描述:COMPUTERS, NETWORK SWITCHES CONNECTIVITY, No. of Ports:8, Data Rate Max:100Mbps, |
| ENHSDURR5 | 制造商:Molex 功能描述:COMPUTERS, NETWORK SWITCHES CONNECTIVITY, No. of Ports:5, Switch Mounting:DIN Ra 制造商:Molex 功能描述:ETHERNET DIN RAIL SWITCH 5PORT |
| ENHSDURR9 | 制造商:MOLEX/WOODHEAD 功能描述:Ethernet Network Switch 制造商:Molex 功能描述:ETHERNET NETWORK SWITCH, No. of Ports:9, Data Rate Max:100Mbps, Switch Mounting: |
| ENI-110 | 功能描述:冲压机与冲模 NON-IMPACT PUNCHDOWN TOOL RoHS:否 制造商:Souriau 大小: 产品:Dies 类型:Crimping 描述/功能: |
| ENICSF2811PBKA | 制造商:Texas Instruments 功能描述: |
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