mk2771-13 Holt Integrated Circuits, Inc., mk2771-13 Datasheet - Page 2

• Manufacturer Part Number: mk2771-13
• Description: Vcxo Set-top Clock Source
• Manufacturer: Holt Integrated Circuits, Inc.

MDS 2771-13 A
Pin Assignment
Pin Descriptions
Key: I = Input, TI = Tri-level input, O = output, P = power supply connection
Number
7, 14, 17
4, 6, 15
ACLK
BCLK
PCLK
VDD
VDD
GND
10
11
12
13
16
18
19
20
Integrated Circuit Systems • 525 Race Street•San Jose•CA•95126•[phone]tel•www.icst.com
PCS0
1
2
3
5
8
9
VIN
X2
X1
1
2
3
4
5
6
7
8
9
10
13.5M
Name
PCLK
BCLK
ACLK
PCS0
VDD
GND
PCS1
ACS0
ACS1
VIN
27M
27M
BCS
X2
X1
Type
XO
TI
XI
O
O
O
O
O
O
20
19
18
17
16
15
14
13
12
11
P
P
P
I
I
I
I
Description
Processor Clock Select 0. Selects PCLK on pin 8. See table above.
Crystal connection. Connect to a pullable 13.5 MHz crystal.
Crystal connection. Connect to a pullable 13.5 MHz crystal.
Connect to +5V.
Voltage Input to VCXO. Zero to 3V signal which controls the frequency of the VCXO.
Connect to ground.
Processor clock output determined by status of PCS1,0. See table above.
33.33MHz or 24.576 MHz Bus Clock output. See table above.
Audio clock output determined by status of ACS1,0. See table above.
13.5 MHz clock output. Divide by two of the 27MHz VCXO output.
Processor Clock Select 1. Selects PCLK on pin 8. See table above.
27.00 MHz VCXO clock output.
27.00 MHz VCXO clock output.
Bus Clock Select . Selects BCLK on pin 9. See table above.
Audio Clock Select 0. Selects ACLK on pin 10. See table above.
Audio Clock Select 1. Selects ACLK on pin 10. See table above.
ACS0
PCS1
13.5M
ACS1
BCS
GND
VDD
GND
27M
27M
Processor Clock Select Table
Audio Clock Table
0 = connect directly to ground, 1 = connect directly
to VDD, M = leave floating or unconnected
ACS1 ACS0 ACLK (MHz)
2
PCS1
0
0
1
1
M
M
0
0
1
1
VCXO and Set-Top Clock Source
0
1
0
1
PCS0
0
1
0
1
0
1
11.2896
12.288
5.6448
8.192
PCLK (MHz)
50.000
16.667
25.000
32.000
40.000
20.000
Revision 110298
Bus Clock Table
BCS
0
1
BCLK (MHz)
MK2771-13
33.333
24.576
Printed 11/16/00