MC68040FE25A Freescale Semiconductor, MC68040FE25A Datasheet - Page 343
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
MC68040FE25A
Manufacturer Part Number
MC68040FE25A
Description
IC MICROPROCESSOR 32BIT 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040FE33A.pdf
(442 pages)
Specifications of MC68040FE25A
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
184
Package Type
CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68040FE25A
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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If a designer uses alternative standard termination methods, such as RC termination
network (see Figure 11-9), Thévenin termination network (not illustrated), or no
termination method at all, which is not recommended, then the power dissipation of the
MC68040 will be significantly less than the large buffer terminated values. For termination
networks other than that illustrated in Figure 11-31, the designer must calculate the
component of power dissipated in the output buffer and add this value to the small buffer
unterminated value.
The following paragraphs describe how the large buffer terminated values were
calculated. The MC68040 termination network causes current flow through the output
buffer of the MC68040, regardless of whether the MC68040 is driving a logic one or a
logic zero. The following equation gives the large buffer termination network power
dissipation for a given pin:
R
pulldown resistance, and a duty cycle average of how often the pin is high, low, or three-
stated. Typical values for Z
output, and 25
based on sequential burst write cycles, R
buffer mode and 25
Maximum termination current in the large buffer mode occurs for output:
MOTOROLA
eff
I = (V
P = I
Low:
High:
is the effective average output resistance, including typical pullup resistance, typical
2
R
eff
I
I
tl
Figure 11-9. Typical Configuration for RC Termination Network
th
(R + Z
= (2.5 V
= (2.75 V
for small buffer output. Using these values and duty cycle assumptions
o
)) + 5 mA
Figure 11-8. MC68040 Termination Network
for the small buffer mode.
MC68040 OUTPUT
TYPICAL Z = 4–12
TYPICAL Z = 25
Freescale Semiconductor, Inc.
MC68040 OUTPUT
TYPICAL Z = 4–12
TYPICAL Z = 25
(50 + 6 )) + 5 mA = 49.6 mA
BUFFER
(50 + 12 )) + 5 mA = 50.8 mA
For More Information On This Product,
BUFFER
o
are 6
0
0
0
0
Go to: www.freescale.com
M68040 USER’S MANUAL
(SMALL)
(SMALL)
(LARGE)
(LARGE)
for large buffer low output, 12
50
50
T.L
eff
T.L
calculates to 7.7
R = 50
R = 50
C = 300 pF
2.5 V
for the MC68040 large
for large buffer high
11-15
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