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PDF ASM3P2855D Data sheet ( Hoja de datos )
| Número de pieza | ASM3P2855D | |
| Descripción | Custom Clock Generator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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ASM3P2855Dwww.DataSheet4U.com
Custom Clock Generator for
FAX System
Features
• Generates Custom Clocks for FAX system from
an inexpensive 24MHz Crystal
• 3 x 50MHz synchronized clocks
• 5 x 54.8MHz synchronized clocks
• 1 x 19.52MHz clock for Scanner
• REFOUT Clock
• Supply Voltage 3.3 V ± 0.3V
• Available in 16L TSSOP, Green package
Product Description
ASM3P2855D is a custom clock generator for FAX system.
ASM3P2855D realizes all the ten clocks required by the
various components and subsystems of the FAX system. It
uses an inexpensive 24MHz crystal as the input to
generate five synchronized 54.8MHz clocks and three
synchronized 50MHz PCI clocks that can be used by CPU,
HDD, PCI Analyzer, ASIC2 and ASIC3, Ethernet, LAN PHY
and for the CPU Timer, a 19.52MHz clock used by ASIC1
for Scanner. The custom clock generator ASM3P2855D
works with a Supply Voltage of 3.3V ± 0.3V. The device is
available in a 16L TSSOP Green package.
Block Diagram
VDD
VDD_FOUT
XIN / CLKIN
XOUT
Crystal
Oscillator
PLL 3
5
GND
GND_FOUT
19.52MHz
50MHz
54.8MHz
REFOUT
©2010 SCILLC. All rights reserved.
MARCH 2010 – Rev. 1
Publication Order Number:
ASM3P2855/D
1 page  
ASM3P2855Dwww.DataSheet4U.com
Typical Crystal Specifications
Fundamental AT cut parallel resonant crystal
Nominal frequency
24MHz
Frequency tolerance
± 50 ppm or better at 25°C
Operating temperature range
-25°C to +85°C
Storage temperature
-40°C to +85°C
Load capacitance(CP)
Shunt capacitance
18pF
7pF maximum
ESR
25 Ω
Note: Note: CL is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency.
Typical Crystal Interface Circuit
R
Crystal
Rx
CL
CL = 2*(CP – CS),
Where CP = Load capacitance of crystal
CS = Stray capacitance due to CIN, PCB, Trace etc.
CL
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| PDF Descargar | [ Datasheet ASM3P2855D.PDF ] | |
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