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USB2512I датащи(PDF) 36 Page - SMSC Corporation

номер детали USB2512I
подробное описание детали  Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller
PDF  37 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB2512I датащи(HTML) 36 Page - SMSC Corporation

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Industrial Temperature Rated USB 2.0 High-Speed 2-Port Hub Controller
Datasheet
Revision 1.92 (11-28-07)
36
SMSC USB2512i
DATASHEET
Chapter 6 AC Specifications
6.1
Oscillator/Clock
Crystal: Parallel Resonant, Fundamental Mode, 24 MHz
±350ppm.
External Clock: 50% Duty cycle
± 10%, 24 MHz ± 350ppm, Jitter < 100ps rms.
Figure 6.1 Typical Crystal Circuit
Note: CB equals total board/trace capacitance.
Figure 6.2 Formula to find value of C1 and C2
6.1.1
SMBus Interface:
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the SMBus 1.0 Specification for Slave-Only devices (except as noted in Section 4.3).
6.1.2
I2C EEPROM:
Frequency is fixed at 58.6KHz
± 20%.
6.1.3
USB 2.0
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the USB 2.0 Specification. Please refer to the USB 2.0 Specification for more information.
XTAL1
(CS1 =
CB + CXTAL )
XTAL2
(CS2 =
CB + CXTAL )
C1
C2
CL
1Meg
Crystal
(C1 + CS1) x (C2 + CS2)
(C1 + CS1 + C2 + CS2)
CL
=



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