參數(shù)資料
型號: TMS320LC57S
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號處理
英文描述: Digital Signal Processors(35/50ns指令周期,并行邏輯單元,可編程PLL,全雙工同步串行口的DSP)
中文描述: 數(shù)字信號處理器(35/50ns指令周期,并行邏輯單元,可編程鎖相環(huán),全雙工同步串行口的數(shù)字信號處理器)
文件頁數(shù): 55/87頁
文件大?。?/td> 1864K
代理商: TMS320LC57S
TMS320C5x, TMS320LC5x
DIGITAL SIGNAL PROCESSORS
SPRS030A – APRIL 1995 – REVISED APRIL 1996
55
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
PLL clock generator option
An external frequency source can be used by injecting the frequency directly into CLKIN2
with X1 left
unconnected and X2 connected to V
DD
. This external frequency is multiplied by the factors shown in Table 9
and Table 10 to generate the internal machine cycle. The multiply-by-one option is available on the ’C50, ’LC50,
’C51, ’LC51, ’C53, ’LC53, ’C53S and ’LC53S. The multiply-by-two option is available on the ’C52 and ’LC52.
Multiplication factors of 1, 2, 3, 4, 5, and 9 are available on the ’LC56, ’LC57, ’C57S and ’LC57S. Refer to Table 9
and Table 10 for appropriate configuration of the CLKMD1, CLKMD2 and CLKMD3 pins to generate the desired
PLL multiplication factor. The external frequency injected must conform to the specifications listed in the timing
requirements table.
switching characteristics over recommended operating conditions [H = 0.5 t
c(CO)
] (’320C5x only)
(see Figure 14)
PARAMETER
’320C5x-40
TYP
’320C5x-57
TYP
UNIT
MIN
MAX
MIN
MAX
tc(CO)
tf(CO)
tr(CO)
tw(COL)
tw(COH)
Cycle time, CLKOUT1
48.8
75
35
75
ns
Fall time, CLKOUT1
5
5
ns
Rise time, CLKOUT1
5
5
ns
Pulse duration, CLKOUT1 low
H – 3
H – 3
H
H + 2
H + 2
H – 3
H – 3
H
H + 2
H + 2
ns
Pulse duration, CLKOUT1 high
H
H
ns
td(C2H-COH)
Delay time, CLKIN2 high to CLKOUT1
high
2
9
16
2
9
16
ns
td(TP)
Delay time, transitory phase—PLL
synchronized after CLKIN2 supplied
1000tc(C2)
1000tc(C2)
ns
PARAMETER
’320C5x-80
TYP
’320C5x-100
TYP
UNIT
MIN
MAX
MIN
MAX
tc(CO)
tf(CO)
tr(CO)
tw(COL)
tw(COH)
Cycle time, CLKOUT1
25
55
20
45
ns
Fall time, CLKOUT1
4
4
ns
Rise time, CLKOUT1
4
4
ns
Pulse duration, CLKOUT1 low
H – 3
H – 3
H
H + 2
H + 2
H – 3
H – 3
H
H + 2
H + 2
ns
Pulse duration, CLKOUT1 high
H
H
ns
td(C2H-COH)
Delay time, CLKIN2 high to CLKOUT1
high
1
8
15
1
8
15
ns
td(TP)
Delay time, transitory phase—PLL
synchronized after CLKIN2 supplied
Values assured by design and not tested
On the TMS320C57S devices, CLKIN2 functions as the PLL clock input.
1000tc(C2)
1000tc(C2)
ns
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