ICST ICS615M, ICS615MT Datasheet
PRELIMINARY INFORMATION
ICS615
I CR O
C
LOC K
Description
The ICS615 is a low cost, low jitter, high
performance PLL clock synthesizer designed to
replace 13.5, 27, and 54MHz crystals and
oscillators. Using analog/digital Phase-Locked
Loop (PLL) techniques, the device uses an
inexpensive external 13.5 MHz crystal or clock
input to produce output clocks of 13.5 MHz,
27 MHz, and 54 MHz .
ICS/MicroClock manufactures the largest variety
of Set-Top Box and multimedia clock synthesizers
for all applications. Our patented integrated
VCXO further reduces component count and cost
(see the MK2720). If more than three clock
outputs are needed, see the MK277x family of
parts. Consult ICS/MicroClock to eliminate
VCXOs, PLLs, crystals and oscillators from your
board.
Set-Top Box Clock Source
Features
• Packaged in 8 pin narrow SOIC
• Output clocks of 54, 27, and 13.5MHz
• Uses a 13.500 MHz clock or external crystal
• Full CMOS outputs with 25mA output drive
capability at TTL levels
• Low skew outputs
• Advanced, low power, sub-micron CMOS process
• +3.3V or +5V operating voltage
• See the MK2720 for these frequencies plus the
VCXO function, in an 8 pin SOIC.
Block Diagram
13.5 MHz
Clock or
Crystal
X1
X2
VDD GND
Input
Buffer/
Crystal
Oscillator
PLL/Clock
Synthesis
Circuitry
Output
Buffer
Output
Buffer
Output
Buffer
54 MHz Clock
27 MHz Clock
13.5 MHz Clock
MDS 615 A 1 Revision 052098 Printed 11/15/00
Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
PRELIMINARY INFORMATION
ICS615
Pin Assignment
I CR O
C
LOC K
ICS615
27M NC
GND
X1
X2
1 8
2
3
4
7
6
5
8 pin (150 mil) SOIC
13.5M
54M
Set-Top Box Clock Source
VDD
Pin Descriptions
Number Name Description
1 27M 27 MHz clock output.
2 GND Connect to ground.
3 X1 Crystal connection. Connect to a13.5 MHz clock or crystal.
4 X2 Crystal connection. Connect to a 13.5 MHz crystal. Leave unconnected for clock input.
5 54M 54 MHz clock output.
6 13.5M 13.5 MHz clock output.
7 VDD VDD. Connect to +3.3V or +5V.
8 NC No Connect. This is an unused power down pin for 27 MHz clock
MDS 615 A 2 Revision 052098 Printed 11/15/00
Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com
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