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COM90C66 bảng dữ liệu(PDF) 45 Page - SMSC Corporation

tên linh kiện COM90C66
Giải thích chi tiết về linh kiện  ARCNET Controller/Transceiver with AT Interface and On-Chip RAM
PDF  76 Pages
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nhà sản xuất  SMSC [SMSC Corporation]
Trang chủ  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM90C66 bảng dữ liệu(HTML) 45 Page - SMSC Corporation

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45
OSCILLATOR
The COM90C66 incorporates on-board circuitry
which, in conjunction with an external parallel
resonant crystal, forms an oscillator.
The
oscillator frequency may vary from 8 MHz to 20
MHz to allow for a variable data rate from 1.0
Mbps to 2.5 Mbps.
The COM90C66 crystal oscillator has been
designed to work with a parallel resonant
crystal.
Only two capacitors are needed (one
from each leg of crystal to ground). The values
of the capacitors are two times the lead
capacitance of the crystal.
The COM90C66
contains an internal 1 M
Ω resistor. The external
crystal must have an accuracy of 0.020% or
better.
FIGURE 13 - DIPULSE GENERATION AND RECEIVE WAVEFORM FOR DATA OF 1-1-0
20MHZ
CLOCK
(FOR
REF. ONLY)
nPULSE1
nPULSE2
DIPULSE
RXIN
1
0
100ns
100ns
200ns
400ns
1



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