AM486DX5-133W16BHC AMD (ADVANCED MICRO DEVICES), AM486DX5-133W16BHC Datasheet - Page 56

• Manufacturer Part Number: AM486DX5-133W16BHC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM486DX5-133W16BHC

• Family Name: Am486
• Device Core Size: 32b
• Frequency (max): 133MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 3.45V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 208
• Package Type: SQFP
• Lead Free Status / Rohs Status: Not Compliant

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10
The following sections describe recommended electri-
cal connections and electrical specifications for the En-
hanced Am486DX microprocessors.
10.1 Power and Grounding
10.1.1 Power Connections
With 16 Kbyte of cache, the Enhanced Am486DX mi-
croprocessors have modest power requirements. How-
ever, the high clock frequency output buffers can cause
power surges as multiple output buffers drive new signal
levels simultaneously. For clean, on-chip power distri-
bution at high frequency, 23 V
feed the microprocessor in the 168-pin PGA package.
The 208-pin SQFP package includes 53 V
38 V
Power and ground connections must be made to all
external V
circuit board, all V
Likewise, all V
plane.
The Enhanced Am486DX microprocessors require only
3.3 V as input power. Unlike other 3-V processors, the
Enhanced Am486DX microprocessors do not require a
V
devices on the system motherboard. For socket com-
patibility, this pin is INC, allowing the Enhanced
Am486DX microprocessors to operate in 3-V sockets
in systems that use 5-V I/O.
CC5
SS
input of 5 V to indicate the presence of 5-V I/O
pins.
ELECTRICAL DATA
CC
and V
SS
pins must connect to a common GND
CC
SS
pins must connect to a V
pins of the microprocessors. On a
CC
pins and 28 V
Enhanced Am486DX Microprocessor Family
CC
P R E L I M I N A R Y
CC
pins and
SS
plane.
pins
10.1.2 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 decoupling capacitors. Capacitors designed specif-
ically for use with PGA packages are commercially avail-
able.
10.1.3 Other Connection Recommendations
For reliable operation, always connect unused inputs to
an appropriate signal level. Active Low inputs should be
connected to V
the range of 20 K
puts should be connected to GND.
CC
through a pull-up resistor. Pull-ups in
are recommended. Active High in-