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TMS320VC549 датащи(PDF) 18 Page - Texas Instruments

номер детали TMS320VC549
подробное описание детали  FIXED-POINT DIGITAL SIGNAL PROCESSOR
PDF  60 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TMS320VC549 датащи(HTML) 18 Page - Texas Instruments

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TMS320VC549
FIXEDPOINT DIGITAL SIGNAL PROCESSOR
SPRS078F – SEPTEMBER 1998 – REVISED MAY 2000
18
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
multiply-by-N clock option – PLL enabled (continued)
timing requirements for multiply-by-N clock option – PLL enabled (see Figure 4)
’549-80
’549-100
’549-120
UNIT
MIN
MAX
MIN
MAX
UNIT
Integer PLL multiplier N (N = 1–15)
20†
200
20†
200
tc(CI)
Cycle time, X2/CLKIN
PLL multiplier N = x.5
20†
100
20†
100
ns
tc(CI)
Cycle time, X2/CLKIN
PLL multiplier N = x.25, x.75
20†
50
20†
50
ns
tf(CI)
Fall time, X2/CLKIN
8
8
ns
tr(CI)
Rise time, X2/CLKIN
8
8
ns
tw(CIL)
Pulse duration, X2/CLKIN low
5
5
ns
tw(CIH) Pulse duration, X2/CLKIN high
5
5
ns
† Note that for all values of tc(CI), the minimum tc(CO) period must not be exceeded.
tc(CO)
tc(CI)
tw(COH)
tf(CO)
tr(CO)
tf(CI)
X2/CLKIN
CLKOUT
td(CIH-CO)
tw(COL)
tr(CI)
tp
Unstable
tw(CIH)
tw(CIL)
Figure 4. External Multiply-by-One Clock Timing



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