ICS650-27 Datasheet, PDF (2/6 Pages) Integrated Circuit Systems – Networking Clock Source

ICS650-27
Networking Clock Source
Pin Assignment
ASC0 1
X2 2
X1/ICLK 3
VDD 4
ASC1 5
GND 6
CLKC1 7
CLKC2 8
CLKB2 9
CLKB1
10
20
BCS1
19
BCS0
18
REFOUT
17
CLKA1
16
VDD
15
OE
14
GND
13
CLKA2
12
DC
11
CCS
20-pin (150 mil) SSOP
Pin Descriptions
Pin
Number
1
2
Pin
Name
ACS0
X2
3
X1/ICLK
4
VDD
5
ACS1
6
GND
7
CLKC1
8
CLKC2
9
CLKB2
10
CLKB1
11
CCS
12
DC
13
CLKA2
14
GND
15
OE
16
VDD
17
CLKA1
18
REFOUT
19
BCS0
20
BCS1
Pin
Type
Pin Description
Input
Input
A clock select 0. Selects outputs on CLKA1 and CLKA2 per table on page 3.
Crystal connection. Connect to a fundamental crystal or leave unconnected for a clock
input.
Input
Power
Input
Crystal connection. Connect to a fundamental crystal or clock input.
Connect to +3.3 V or 5 V. Must be the same as pin 16.
A clock select 1. Selects outputs on CLKA1 and CLKA2 per table on page 3. Internal
pull-up.
Power
Output
Output
Output
Output
Input
-
Output
Power
Input
Power
Output
Output
Input
Input
Connect to ground.
Output Clock C1. Depends on setting of CCS per table on page 3.
Output Clock C2. Depends on setting of CCS per table on page 3. Same as CLKC1.
Output Clock B2. Depends on setting of BCS1, 0 per table on page 3.
Output Clock B1. Depends on setting of BCS1, 0 per table on page 3.
Clock C select pin. Selects outputs on CLKC1 and CLKC2 per table on page 3.
Don’t connect. Do not connect anything to this pin.
Output Clock A2. Depends on setting of ACS1, 0 per table on page 3.
Connect to ground.
Output enable. Tri-states all outputs when low. Internal pull-up.
Connect to +3.3 V or 5 V. Must be the same as pin 4.
Output Clock A1. Depends on setting of ACS1, 0 per table on page 3.
Buffered reference clock output. Same frequency as crystal or clock input.
B clock select 0. Selects outputs on CLKB1 and CLKB2 per table on page 3.
B clock select 1. Selects outputs on CLKB1 and CLKB2 per table on page 3. Internal
pull-up.
MDS 650-27 D
2
Revision 070505
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