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Número de pieza | ICS448-16 | |
Descripción | Networking Clock Synthesizer | |
Fabricantes | 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
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
5 Page |
Páginas | Total 7 Páginas | |
PDF Descargar | [ Datasheet ICS448-16.PDF ] |
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