MC68340AG25E Freescale Semiconductor, MC68340AG25E Datasheet - Page 396
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MC68340AG25E
Manufacturer Part Number
MC68340AG25E
Description
IC MPU 32BIT 25MHZ 144-LQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68340FE25E.pdf
(441 pages)
Specifications of MC68340AG25E
Processor Type
M683xx 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
144-LQFP
Controller Family/series
68K
Core Size
32 Bit
No. Of I/o's
16
Cpu Speed
25MHz
No. Of Timers
2
Embedded Interface Type
UART
Digital Ic Case Style
LQFP
Rohs Compliant
Yes
Processor Series
M683xx
Core
CPU32
Maximum Clock Frequency
25 MHz
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68340AG25E
Manufacturer:
Freescale Semiconductor
Quantity:
135
Company:
Part Number:
MC68340AG25E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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The method for calculating a frequency-adjusted t s is as follows:
where:
The following calculation uses a 16.78-MHz port, specification 21, R/ W high to A S
asserted, at 8 MHz as an example:
therefore:
In this manner, new specifications for lower frequencies can be derived for an MC68340.
MOTOROLA
t s = 15 ns minimum
N = 0
T f '/2 = 125/2 = 62.5 ns
T f /2 = 60/2 = 30 ns
t d1 = 30 ns maximum
t s ' = the frequency-adjusted skew
t s = the skew at full speed
N = the number of full one-half clock periods in t s , if any
T f '/2 = one-half the new clock period
T f /2 = one-half the clock period at full speed
t d1 = the propagation time for the first output from the clock edge
OUTPUT2
OUTPUT1
CLKOUT
t s ' = 15 + 0(62.5 – 30) + (62.5 – 30) = 47.5 ns minimum
Figure 10-13. Skew between Two Outputs
Freescale Semiconductor, Inc.
For More Information On This Product,
t s ' = t s + N (T f '/2 – T f /2) + (T f '/2 – t d1 )
t d1
MC68340 USER’S MANUAL
Go to: www.freescale.com
T/2
t s
t
d2
10-9
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