MK2771-12S Integrated Circuit Systems, MK2771-12S Datasheet - Page 2

• Manufacturer Part Number: MK2771-12S
• Description: VCXO and Set-Top Clock Source
• Manufacturer: Integrated Circuit Systems

MDS 2771-12 A
MicroClock Division of ICS • 525 Race Street • San Jose • CA • 95126•[phone]tel•[phone]fax
Pin Descriptions
Key: I = Input, TI = Tri-level input, O = output, P = power supply connection
Pin Assignment
AVDD
Number
UCLK
ACLK
PCLK
VDD
GND
PCS0
10
11
12
13
14
15
16
17
18
19
20
VIN
1
2
3
4
5
6
7
8
9
X2
X1
1
2
3
4
5
6
7
8
9
10
11.06M
AVDD
UCLK
13.5M
Name
PCLK
ACLK
PCS0
VDD
GND
PCS1
GND
VDD
GND
VIN
27M
27M
UCS
ACS
X2
X1
I C R O
20
19
18
17
16
15
14
13
12
11
Type
TI
O
O
O
O
O
O
O
O
P
P
P
P
P
P
I
I
I
I
I
C
ACS
UCS
27M
VDD
GND
11.06M
PCS1
13.5M
27M
GND
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.
Analog VDD. Connect to +5V.
Voltage Input to VCXO. Zero to 3V signal which controls the frequency of the VCXO.
Connect to +5V.
Connect to ground.
Processor clock output determined by status of PCS1,0. See table above.
UART clock output determined by status of UCS. See table above.
49.152 MHz or 24.576 MHz clock output determined by ACS. 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.
11.0592 MHz clock output.
Connect to ground.
Connect to +5V.
27.00 MHz VCXO clock output.
Connect to ground.
27.00 MHz VCXO clock output.
UART Clock Select. Selects UCLK on pin 9. See table above.
ACLK Select. Selects ACLK on pin 10. See table above.
LOC K
UART Clock Table
UCS
0
1
2
VCXO and Set-Top Clock Source
Processor Clock Select Table
0 = connect directly to ground, 1 = connect directly
to VDD, M = leave floating or unconnected
UCLK (MHz)
PCS1
M
M
0
0
1
1
18.432
3.6864
PCS0
0
1
0
1
0
1
Revision 061699
PCLK (MHz)
ACLK Select Table
50.000
16.667
32.000
40.000
20.000
ACS
test
0
1
MK2771-12
ACLK (MHz)
49.152
24.576
Printed 11/16/00