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MK2049-02
Communications Clock PLL
MDS2049-02
2
Revision 7309
Printed 7/30/99
MicroClock Division of ICS 525 Race Street San Jose CA 95126 (408)295-9800tel(408)295-9818fax
ICRO
CLOCK
ADVANCE
ADVANCE INFORMATION
INFORMATION
Pin Descriptions
Type: XI, XO = crystal connections, I = Input, O = output, P = power supply connection, LF = loop filter
connections
Pin Assignment
20 pin (300 mil) SOIC
1
16
2
3
4
15
14
13
VDD
GND
X2
VDD
GND
5
6
7
8
12
11
10
9
FS3
X1
FS1
FS0
CAP1
ICLK
8K
CLK1
CLK2
18
17
19
20
VDD
FS2
GND
CAP2
RESET
Number
Name
Type Description
1
FS1
I
Frequency Select 1. Determines CLK input/outputs per tables on page 3.
2
X2
XO Crystal connection. Connect to a MHz crystal as shown in the tables on page 3.
3
X1
XI
Crystal connection. Connect to a MHz crystal as shown in the tables on page 3.
4
VDD
P
Connect to +5V.
5
VDD
P
Connect to +5V.
6
VDD
P
Connect to +5V.
7
GND
P
Connect to ground.
8
CLK2
O
Clock 2 output determined by status of FS3:0 per tables on page 3.
9
CLK1
O
Clock 1 output determined by status of FS3:0 per tables on page 3. Always equals 1/2 of CLK2.
10
8K
O
Recovered 8 kHz clock output. On External Mode only.
11
FS2
I
Frequency Select 2. Determines CLK input/outputs per tables on page 3.
12
FS3
I
Frequency Select 3. Determines CLK input/outputs per tables on page 3.
13
ICLK
I
Input clock connection. Connect to 8 kHz backplane or MHz clock.
14
GND
P
Connect to ground.
15
VDD
P
Connect to +5V.
16
CAP1
LF
Connect the loop filter ceramic capacitors and resistor between this pin and CAP2.
17
GND
P
Connect to ground.
18
CAP2
LF
Connect the loop filter ceramic capacitors and resistor between this pin and CAP1.
19
RESET
I
Reset pin. Resets internal PLL when low. Outputs will stop low.
20
FS0
I
Frequency Select 0. Determines CLK input/outputs per tables on page 3.