ICS281
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER
EPROM CLOCK SYNTHESIZER
Pin Assignment
GND
S0
S1
VDD
VDDO
CLK1
GND
X1/ICLK
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
S2
VDD
PDTS
GND
CLK3
CLK2
VDD
X2
16 pin (173 mil) TSSOP
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
Name
GND
S0
S1
VDD
VDDO
CLK1
GND
X1
X2
VDD
CLK2
CLK3
GND
PDTS
VDD
S2
Pin
Type
Power
Input
Input
Power
Power
Output
Power
XI
XO
Power
Output
Output
Power
Input
Power
Input
Connect to ground.
Pin Description
Select pin 0. Internal pull-up resistor.
Select pin 1. Internal pull-up resistor.
Connect to +3.3 V.
Power supply for outputs.
Output clock 1. Weak internal pull-down when tri-state.
Connect to ground.
Crystal input. Connect this pin to a crystal or external input clock.
Crystal Output. Connect this pin to a crystal. Float for clock input.
Connect to +3.3 V.
Output clock 2. Weak internal pull-down when tri-state.
Output clock 3. Weak internal pull-down when tri-state.
Connect to ground.
Power-down tri-state. Powers down entire chip and tri-states clock outputs
when low. Internal pull-up resistor.
Connect to +3.3 V.
Select pin 2. Internal pull-up resistor.
IDT™ / ICS™
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 2
ICS281
REV E 083109
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
