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): 53/87頁
文件大?。?/td> 1864K
代理商: TMS320LC57S
TMS320C5x, TMS320LC5x
DIGITAL SIGNAL PROCESSORS
SPRS030A – APRIL 1995 – REVISED APRIL 1996
53
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
external divide-by-two clock option
An external frequency source can be used by injecting the frequency directly into X2/CLKIN with X1 left
unconnected. Refer to Table 9 and Table 10 for appropriate configuration of the CLKMD1, CLKMD2 and
CLKMD3 pins to generate the external divide-by-2 clock option. 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 13)
PARAMETER
’320C5x-40
MIN
’320C5x-57
MIN
UNIT
TYP
MAX
TYP
MAX
tc(CO)
td(CIH-COH/L)
tf(CO)
tr(CO)
tw(COL)
tw(COH)
Cycle time, CLKOUT1
48.8
2tc(CI)
35
2tc(CI)
ns
Delay time, X2/CLKIN high to CLKOUT1 high/low
3
11
20
3
11
20
ns
Fall time, CLKOUT1
5
5
ns
Rise time, CLKOUT1
5
5
ns
Pulse duration, CLKOUT1 low
H – 3
H
H + 2
H – 3
H
H + 2
ns
Pulse duration, CLKOUT1 high
H – 3
H
H + 2
H – 3
H
H + 2
ns
PARAMETER
’320C5x-80
’320C5x-100
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
tc(CO)
td(CIH-COH/L)
tf(CO)
tr(CO)
tw(COL)
tw(COH)
Cycle time, CLKOUT1
25
2tc(CI)
20
2tc(CI)
ns
Delay time, X2/CLKIN high to CLKOUT1 high/low
1
9
18
1
9
18
ns
Fall time, CLKOUT1
4
4
ns
Rise time, CLKOUT1
4
4
ns
Pulse duration, CLKOUT1 low
H – 3
H
H + 2
H – 3
H
H + 2
ns
Pulse duration, CLKOUT1 high
H – 3
H
H + 2
H – 3
H
H + 2
ns
switching characteristics over recommended operating conditions [H = 0.5 t
c(CO)
] (’320LC5x only)
(see Figure 13)
PARAMETER
’320LC5x-40
’320LC5x-50
’320LC5x-80
UNIT
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
tc(CO)
Cycle time, CLKOUT1
50
2tc(CI)
40
2tc(CI)
25
2tc(CI)
ns
td(CIH-COH/L)
Delay time, X2/CLKIN high to
CLKOUT1 high/low
3
11
20
3
11
20
1
9
18
ns
tf(CO)
tr(CO)
tw(COL)
tw(COH)
This device utilizes a fully static design and, therefore, can operate with tc(Cl) approaching infinity. The device is characterized at frequencies
approaching 0 Hz but is tested at tc(CO) = 300 ns to meet device test time requirements.
Fall time, CLKOUT1
5
5
4
ns
Rise time, CLKOUT1
5
5
4
ns
Pulse duration, CLKOUT1 low
H – 3
H
H + 2
H – 3
H
H + 2
H – 3
H
H + 2
ns
Pulse duration, CLKOUT1 high
H – 3
H
H + 2
H – 3
H
H + 2
H – 3
H
H + 2
ns
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