ICS525-01/02

OSCaR™ User Configurable Clock

MDS 525-01/02 I

3

Revision 071100

Printed 11/13/00

Integrated Circuit Systems, Inc. • 525 Race Street •San Jose• CA • 95126•(408) 295-9800tel• www.icst.com

S2

S1

S0

CLK

Max. Ou

utput Frequency ((MHz)

pin 5

pin 4

pin 3

Output Divider

VDD

D = 5 V

VDD

D = 3.3V

0-70 °C -40 to +85 °C 0-70 °C -40 to +85 °C

000

10

26

23

18

16

001

2

160

140

100

90

010

8

40

36

25

22

011

4

80

72

50

45

100

5

50

45

34

30

101

7

40

36

26

23

110

9

33.3

30

20

18

111

6

53

47

27

24

ICS525-01 Output Divider and Maximum Output Frequency Table

S2

S1

S0

CLK

Max. Output Freequency (MHz)

pin 5

pin 4

pin 3

Output Divider

VDD = 5V

VDD = 3.3V

-40 to +85 °C

-40 to +85 °C

0

0

0

6

67

40

0

0

1

2

200

120

0

1

0

8

50

30

0

1

1

4

100

60

1

0

0

5

80

48

1

0

1

7

57

34

1

1

0

1

250

200

1

1

1

3

133

80

ICS525-02 Output Divider and Maximum Output Frequency Table

External Components / Crystal Selection

The ICS525 requires two 0.01µF decoupling capacitors to be connected between VDD and GND, one on

each side of the chip. They must be connected close to the ICS525 to minimize lead inductance. No

external power supply filtering is required for this device. A 33

Ω series terminating resistor can be used

next to the CLK and REF pins. The approximate total on-chip capacitance for a crystal is 16pF, so a

parallel resonant, fundamental mode crystal with this value of load (correlation) capacitance should be

used. For example, using the ICS525-01 with crystals having a specified load capacitance greater than

16 pF, crystal capacitors may be connected from each of the pins X1 and X2 to Ground as shown in the

Block Diagram on page 1. The value (in pF) of these crystal caps should be = (CL-16)*2, where CL is the

crystal load capacitance in pF. These external capacitors are only required for applications where the exact

frequency is critical. For a clock input, connect to X1 and leave X2 unconnected (no capacitors on either).

The ICS525-02 is only offered in the

industrial temperature range.