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PDF ICS448-16 Data sheet ( Hoja de datos )

Número de pieza ICS448-16
Descripción Networking Clock Synthesizer
Fabricantes ICS 
Logotipo ICS Logotipo



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ICS448-16
Networking Clock Synthesizer
Description
The ICS448-16 generates four high-quality,
high-frequency clock outputs. It is designed to replace
multiple crystals and crystal oscillators in networking
applications. Using ICS’ patented Phase-Locked Loop
(PLL) techniques, the device runs from a 25 MHz
crystal or clock input.
Features
Packaged in 16-pin TSSOP
Replaces multiple crystals and oscillators
Input crystal or clock frequency of 25 MHz
Zero ppm frequency synthesis error
Fixed output frequencies of 25 MHz and 48 MHz
Selectable output frequencies of 24 MHz, 48 MHz,
50 MHz and 66.6666 MHz
Duty cycle of 45/55
Operating voltage of 3.3 V
Advanced, low power CMOS process
Block Diagram
SEL
25 MHz clock
or crystal input
X1
X2
Crystal
Oscillator/
Clock
Buffer
External capacitors
may be required.
VDD
3
PLL1
PLL2
PLL3
4
GND
CLK1
CLK2
48M
25M
PDTS (all outputs and PLLs)
MDS 448-16 E
1
Revision 031605
Integrated Circuit Systems 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

1 page




ICS448-16 pdf
ICS448-16
Networking Clock Synthesizer
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature 0 to +70°C
Parameter
Symbol Conditions
Min.
Input Frequency
Output Rise Time
Output Fall Time
Output Clock Duty Cycle
fIN
tOR 20% to 80%, Note 1
tOF 80% to 20%, Note 1
at VDD/2, Note 1
45
Absolute Clock Period Jitter
Note 1
Frequency Synthesis Error
All clock outputs
Startup Time
Output Enable Time
tOE PDTS high to output
locked to ±1%
Output Disable Time
tOD PDTS low to tri-state
Note 1: Measured with a 15 pF load.
Thermal Characteristics
Typ.
25
1
1
50
±150
0
1
20
2
Max. Units
MHz
ns
ns
55 %
ps
ppm
2 ms
µs
ns
Parameter
Symbol Conditions
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to Case
θJA Still air
θJA 1 m/s air flow
θJA 3 m/s air flow
θJC
Marking Diagram
16
9
Min.
Typ.
78
70
68
37
Max.
Units
°C/W
°C/W
°C/W
°C/W
448R-16
######
YYWW
18
Notes:
1. ###### is the lot code.
2. YYWW is the last two digits of the year, and the week
number that the part was assembled.
MDS 448-16 E
5
Revision 031605
Integrated Circuit Systems 525 Race Street, San Jose, CA 95126 tel (408) 297-1201 www.icst.com

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