ICS448-16 Datasheet, PDF (2/7 Pages) Integrated Circuit Systems – Networking Clock Synthesizer

Pin Assignment
X1 1
GND 2
S0 3
CLK1 4
VDD 5
GND 6
48M 7
CLK2 8
16 X2
15 VDD
14 PDTS
13 S1
12 VDD
11 GND
10 ^25M
9 VDD
16-pin (173 mil) TSSOP
ICS448-16
Networking Clock Synthesizer
Output Select Table (MHz)
S1 S0
00
01
10
11
CLK1
50
66.6666
50
66.6666
CLK2
48
48
24
24
Pin Descriptions
Pin
Number
1
2
3
4
Pin
Name
X1
GND
S0
CLK1
5
VDD
6
GND
7
48M
8
CLK2
9
VDD
10
25M
11
GND
12
VDD
13
S1
14
PDTS
15
VDD
16
X2
Pin
Type
XI
Power
Input
Output
Power
Power
Output
Output
Power
Output
Power
Power
Input
Input
Power
XO
Pin Description
Crystal input. Connect this pin to a crystal or external clock source.
Connect to ground.
Select pin 0. Internal pull-up resistor.
Selectable output clock. See table above. Weak internal pull-down when
tri-state.
Connect to voltage supply.
Connect to ground.
48 MHz output clock. Weak internal pull-down when tri-state.
Selectable output clock. See table above. Weak internal pull-down when
tri-state.
Connect to voltage supply.
25 MHz output clock. Weak internal pull-down when tri-state.
Connect to ground.
Connect to voltage supply.
Select pin 1. Internal pull-up resistor.
Power down tri-state. Powers down entire chip and tri-states outputs
when low. Internal pull-up resistor.
Connect to voltage supply.
Crystal output. Connect this pin to a crystal. Float for clock input.
MDS 448-16 E
2
Revision 031605
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