MC68040FE33A Freescale Semiconductor, MC68040FE33A Datasheet - Page 344

IC MICROPROCESSOR 32BIT 184-CQFP

MC68040FE33A

Manufacturer Part Number
MC68040FE33A
Description
IC MICROPROCESSOR 32BIT 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68040FE33A

Processor Type
M680x0 32-Bit
Speed
33MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Package
184CQFP
Processor Series
M680xx
Core
CPU32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
 Details

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68040FE33A
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Maximum power dissipation in the large buffer mode occurs for output:
Similar calculations for unterminated small buffers yield:
and
so
Assuming that the duty cycle of output j is driving a valid logic value instead of being
three-stated as given by DC j , then the following equation approximates total average
power dissipation in the output buffers:
I
summation is carried out by groups of pins instead of individual pins.
Motorola has calculated the values for DC
there will be 37.8 pins high, 41.5 pins low, and 11.7 pins three-stated. The following
examples demonstrate how to calculate the power dissipation that is added to small buffer
power dissipation numbers, assuming a termination as illustrated in Figure 11-18.
11-16
j
a. For the numbers listed in this section in a large buffer design with no caching.
b. For a single bus master system in a large buffer design with no caching or snooping
c. For the example b system with copyback caching, assuming 85% cache hit rate:
Low:
High:
and Z
P = (Number of Pins High) (P
and only standard features (i.e., TLN, UPA, BR, BB, LOCK, LOCKE, CIOUT, TIP, MI,
TDO, IPEND, PST not used):
P = (Number of Pins High) (P
P = (29.8 Pins
= 37.8 Pins
= 1.75 W
= 29.8 Pins
= 1.41 W
= 0.21 W
oj
P
P
are calculated for every pin as illustrated above. In practice the above
llb
hlb
= I
= I
2
2
R = (49.6 mA)
R = (50.8 mA)
30.1 mW per Pin + 41.5 Pins
30.1 mW per Pin + 34.5 Pins
30.1 mW per Pin + 34.5 Pins
Freescale Semiconductor, Inc.
For More Information On This Product,
P = I
I
Total
M68040 USER’S MANUAL
2
2
Go to: www.freescale.com
Outputs Used
x 6
x 12
P
P
hlb
hlb
I = 5 mA (by spec)
2
Number of
hsb
=
lsb
R = (5 mA)
) + (Number of Pins Low)
) + (Number of Pins Low)
j = 1
= 0.625 mW
= 0.625 mW
= 14.8 mW
= 30.1 mW
(I
j
j
for typical situations. On an average clock
DC
2
x 25
j
)
2
14.8 mW per Pin
14.8 mW per Pin
14.8 mW per Pin)
R
effj
(P
(P
llb
llb
)
)
(1 – 0.85)
MOTOROLA

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