P R E L I M I N A RY I N F O R M AT I O N
ICS1493-17
Clock Synthesizer for Portable Systems
Pin Assignment
GND
VDD
27M
X1
X2
Output Enable Table
OE
Clock Output State
GND
48M
VDDO
OE
VDD
1
16
0
GND
VDD
37M
VDDO
Normal Operation
Hi-Z
1
Note: OE pin has an internal pull-down resistor.
6
11
22/24M
22M
GND
20-pin QFN
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Pin
Name
GND
48M
VDDO
OE
VDD
22M
GND
SCK
SDATA
GND
22/24M
VDDO
37M
VDD
GND
GND
27M
SDATA
GND
SCK
Pin
Type
Power
Output
Power
Input
Power
Output
Power
Input
Input
Power
Output
Power
Output
Power
Power
Power
Output
Connect to ground.
Pin Description
48 MHz clock output. High impedance state when OE=1.
Output voltage level. Connect to +1.8 or 2.5 V. Same voltage as pin
12.
Output Enable pin. See table above. Internal pull-down resistor.
Connect to +1.8 V.
22.5792 MHz clock output. Internal pull-down. High impedance state
when OE=1.
Connect to ground.
I
2
C bus clock pin. Internal pull-up resistor.
I
2
C bus data pin. Internal pull-up resistor.
Connect to ground.
Selectable output clock of either 22.5792M or 24.576M. See table.
Internal pull-down. High impedance state. OE=1.
Output voltage level. Connect to +1.8 or 2.5 V. Same voltage as pin 3.
Spread spectrum 37 MHz clock output. See table. Internal pull-down.
High impedance state when OE=1.
Connect to +1.8 V.
Connect to ground.
Connect to ground.
27 MHz reference clock output. Internal pull-down. High impedance
state when OE=1.
2
MDS 1493-17 A
Integrated Circuit Systems
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Revision 101005
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te l (4 08) 297 -1201
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ICS [ INTEGRATED CIRCUIT SYSTEMS ]
