ICS552A-01
Oscillator, Multiplier, and Buffer with 8 Outputs
Description
The ICS552A-01 produces 8 low-skew copies of the
multiple input clock or fundamental, parallel-mode
crystal. Unlike other clock drivers, these parts do not
require a separate oscillator for the input. Using ICS’
patented Phase-Locked Loop (PLL) to multiply the
input frequency, it is ideal for generating and
distributing multiple high-frequency clocks.
This is a
single chip used for 3 different applications:
1) ICS552A-01 (A mode) — an Oscillator mutiplier
2) ICS552A-01 (B mode) — a Dual 1:4 buffer
3) ICS552A-01 (C mode) — a 1:8 Oscillator buffer
ICS552A-01 (for B mode)
•
Up to 200 MHz clock input/output at 3.3 V
•
Low skew of 250 ps maximum for any bank of four
•
Inputs can be connected together for a 1 to 8 buffer
with 250 ps skew between any outputs
•
•
•
•
Non-inverting buffer mode
Ideal for clock networks
Output Enable mode tri-states outputs
Full CMOS output swing with 25 mA output drive
capability at TTL levels
•
Advanced, low power, sub-micron CMOS process
ICS552A-01 (for C mode)
Features (all)
•
•
•
•
Packaged as 20-pin SSOP (QSOP)
Pb-free packaging available
Operating voltages of 3.0 V to 5.5 V
Industrial temperature available
•
Use with 25 MHz crystal for networking
•
Use with 27 MHz crystal for MPEG
ICS552A-01 (for A and C modes)
Features (specific)
ICS552A-01 (for A mode)
•
Input frequency of 10.0 to 27.0 MHz
•
Provides 8 low-skew outputs (<250 ps)
•
Output clock duty cycle of 40/60 at 3.3 V
•
Contains on-chip multiplier with selections of x1,
x1.33, x2, x2.66, x3, x3.33, x4, x4.66, x5, and x6
•
Power-down and Tri-state modes
Block Diagram
(ICS552A-01—A mode)
VDD
S3:S0
4
CLK1
CLK2
CLK3
PLL
Multiplier
CLK4
CLK5
CLK6
Crystal
Buffer/
Crystal
Oscillator
GND
CLK7
CLK8
10.0 to 27.0 MHz
crystal or clock input
X1
X2
External capacitors are
required with a crystal input.
MDS 552A-01 B
Integrated Circuit Systems, Inc.
●
1
525 Race Street, San Jose, CA 95126
●
Revision 010906
tel (408) 297-1201
●
www.icst.com
ICS552A-01
Oscillator, Multiplier, and Buffer with 8 Outputs
Pin Assignment
(ICS552A-01—A mode)
DC
X2
X1/ICLK
VDD
S2
GND
CLK1
CLK2
CLK3
CLK4
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
S0
DC
CLK8
CLK7
VDD
S3
GND
CLK6
CLK5
S1
Multiplier Select Table
S3
0
0
0
0
0
0
0
0
1
1
1
1
S2
0
0
0
0
1
1
1
1
0
0
0
1
S1
0
0
1
1
0
0
1
1
0
0
1
0
S0
0
1
0
1
0
1
0
1
0
1
0
1
Multiplier
Power Down
x1
x1.333
x2
x2.666
x3
x3.333
x4
x5
x4.66
x6
Tri-state all
20-pin (150 mil) SSOP (QSOP)
Pin Descriptions
(ICS552A-01—A mode)
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin
Name
DC
X2
X1/ICLK
VDD
S2
GND
CLK1
CLK2
CLK3
CLK4
S1
CLK5
CLK6
GND
S3
VDD
CLK7
CLK8
DC
S0
Pin
Type
—
XO
XI
Power
Input
Power
Output
Output
Output
Output
Input
Output
Output
Power
Input
Power
Output
Output
—
Input
Do not connect.
Pin Description
Crystal connection. Connect to a 10 - 27 MHz fundamental mode crystal.
Crystal connection. Connect to a 10 - 27 MHz fundamental mode crystal or
clock.
Connect to +3.3 V or 5 V. Decouple with pin 6. Must be same as other VDDs.
Multiplier Select pin 2 per table above.
Connect to ground.
Output clock 1.
Output clock 2.
Output clock 3.
Output clock 4.
Multiplier Select pin 1 per table above
Output clock 5.
Output clock 6.
Connect to ground.
Multiplier Select pin 3 per table above
Connect to +3.3 V or 5 V. Decouple with pin 14. Must be same as other VDDs.
Output clock 7.
Output clock 8.
Do not connect.
Multiplier Select pin 0 per table above
MDS 552A-01 B
Integrated Circuit Systems, Inc.
●
2
525 Race Street, San Jose, CA 95126
●
Revision 010906
tel (408) 297-1201
●
www.icst.com
ICS552A-01
Oscillator, Multiplier, and Buffer with 8 Outputs
Block Diagram
(ICS552A-01—B mode)
INA
QA1
QA2
QA3
S1
S0
Control
Logic
QA4
QB1
QB2
QB3
INB
QB4
Pin Assignment
(ICS552A-01—B mode)
INA
DC
DC
VDD
VDD
GND
QA1
QA2
QA3
QA4
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
S0
INB
QB4
QB3
VDD
VDD
GND
QB2
QB1
S1
20-pin (150 mil) SSOP (QSOP)
Clock Output Select Table
(ICS552A-01—B mode)
S1 S0
0
0
1
1
0
1
0
1
Mode
QA1:4 and QB1:4 running
Test mode
OE. All outputs in high impedance
QA1:4 only. QB1:4 stopped low
MDS 552A-01 B
Integrated Circuit Systems, Inc.
●
3
525 Race Street, San Jose, CA 95126
●
Revision 010906
tel (408) 297-1201
●
www.icst.com
ICS552A-01
Oscillator, Multiplier, and Buffer with 8 Outputs
Pin Descriptions
(ICS552A-01—B mode)
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin
Name
INA
DC
DC
VDD
VDD
GND
QA1
QA2
QA3
QA4
S1
QB1
QB2
GND
VDD
VDD
QB3
QB4
INB
S0
Pin
Type
CI
—
—
Power
Power
Power
Output
Output
Output
Output
I
Output
Output
Power
Power
Power
Output
Output
CI
I
Do not connect.
Do not connect.
Pin Description
Input to buffer A. Outputs QA1:4 will be the same frequency. Internal pull-up resistor.
Connect to +3.3 V or 5.0 V. Must be same as other VDDs.
Connect to +3.3 V or 5.0 V. Must be same as other VDDs.
Connect to ground.
Output 1 from buffer A.
Output 2 from buffer A.
Output 3 from buffer A.
Output 4 from buffer A.
Mode Select pin 1. Selects mode for outputs. Must be at GND for all clocks on. Internal
pull-up resistor.
Output 1 from buffer B.
Output 2 from buffer B.
Connect to ground.
Connect to +3.3 V or 5.0 V. Must be same as other VDDs.
Connect to +3.3 V or 5.0 V. Must be same as other VDDs.
Output 3 from buffer B.
Output 4 from buffer B.
Input to buffer B. Outputs QA1:4 will be the same frequency. Internal pull-up resistor.
Mode Select pin 0. Selects mode for outputs. Must be at GND for all clocks on. Internal
pull-up resistor.
KEY: CI = clock input with pull-up resistor; I = input with internal pull-up resistor.
MDS 552A-01 B
Integrated Circuit Systems, Inc.
●
4
525 Race Street, San Jose, CA 95126
●
Revision 010906
tel (408) 297-1201
●
www.icst.com
ICS552A-01
Oscillator, Multiplier, and Buffer with 8 Outputs
Block Diagram
(ICS552A-01—C mode)
VDD
5
CLK1
CLK2
CLK3
CLK4
10.0 to 27.0 MHz
crystal input
X1
Crystal
Oscillator
X2
External capacitors are
required with a crystal input.
GND
3
CLK5
CLK6
CLK7
CLK8
Pin Assignment
(ICS552A-01—C mode)
DC
X2
X1
VDD
GND
GND
CLK1
CLK2
CLK3
CLK4
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VDD
DC
CLK8
CLK7
VDD
VDD
GND
CLK6
CLK5
VDD
20-pin (150 mil) SSOP (QSOP)
MDS 552A-01 B
Integrated Circuit Systems, Inc.
●
5
525 Race Street, San Jose, CA 95126
●
Revision 010906
tel (408) 297-1201
●
www.icst.com
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