MK1432 Просмотр технического описания (PDF) - Integrated Circuit Systems
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MK1432 Datasheet PDF : 4 Pages
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Pin Assignment
FS2 1
X2 2
X1 3
VDD 4
GND 5
BCLK 6
24M 7
PS 8
MK1432/MK1434
Green PC and Local Bus Clock Source
16 FS1
15 2XCPU
14 CPU
13 VDD
12 GND
11 14.3M
10 FS0
9 BCLKS
FS2 1
X2 2
X1 3
VDD 4
GND 5
BCLK 6
40M 7
PS 8
16 FS1
15 2XCPU
14 CPU
13 VDD
12 GND
11 14.3M
10 FS0
9 BCLKS
CPU Clock Decoding Table (in MHz)
Local Bus Clock Decoding Table (in MHz)
PS FS2 FS1 FS0 2XCPU
CPU
1 0 0 0 16.00
8.00
1 0 0 1 100.00 note 350.00 note3
1 0 1 0 80.00
40.00
1 0 1 1 75.00
37.50
1 1 0 0 40.00
20.00
1 1 0 1 50.00
25.00
1 1 1 0 66.66
33.33
1 1 1 1 60.00
30.00
0 X X X 33.33
16.67
Pin Descriptions
BCLKS
0
M
1
BCLK (MHz)
25.00
33.33
50.00
Notes:
1. Actual frequencies are within 0.05% of those shown.
2. Transitions between mean frequencies on any CPU pin are
smooth, and do not violate Intel’s 0.1% per cycle specification.
3. These selections are not guaranteed to operate at 3V.
4. M = mid level. Leave pin tri-stated, unconnected, or floating to
select this level.
5. X = don’t care (either 0 or 1).
1432
1
2
3
4
5
6
7
-
8
9
10
11
12
13
14
15
16
1434
1
2
3
4
5
6
-
7
8
9
10
11
12
13
14
15
16
Name
FS2
X2
X1
VDD
GND
BCLK
24M
40M
PS
BCLKS
FS0
14.3M
GND
VDD
CPU
2XCPU
FS1
Type
I
O
I
P
P
O
O
O
I
TI
I
O
P
P
O
O
I
Description
Select 2 for 2XCPU and CPU frequencies. See table above. Internal Pull-Up.
Crystal connection. Connect to 14.31818 MHz crystal.
Crystal connection. Connect to 14.31818 MHz crystal or clock.
Connect to +5V or 3.3V. Must be same voltage as pin 13.
Connect to ground.
Local Bus Clock output. See table above.
24.00 MHz clock output (MK1432 only).
40.00 MHz clock output (MK1434 only).
Power Saving pin. Smoothly changes CPU to/from 33.33 and 16.67 MHz. IPU.
Local Bus Clock Select pin. See table above.
Select 0 for 2XCPU and CPU frequencies. See table above. Internal Pull-Up.
14.318 MHz Reference Clock Output.
Connect to ground.
Connect to +5V or 3.3V. Must be same voltage as pin 4.
CPU Clock output. See table above for frequencies.
2X CPU Clock output. See table above for frequencies.
Select 1 for 2XCPU and CPU frequencies. See table above. Internal Pull-Up.
Key: TI = Tri-level Input, I = Input, O = output, P = power supply connection
MDS 1432 G
2
Revision 060101
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com
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