参数资料
型号: SM320C50HFGM66
厂商: TEXAS INSTRUMENTS INC
元件分类: 数字信号处理
英文描述: 16-BIT, 66 MHz, OTHER DSP, CQFP132
封装: TIE BAR, CERAMIC, QFP-132
文件页数: 5/35页
文件大小: 536K
代理商: SM320C50HFGM66
SMJ320C50/SMQ320C50
DIGITAL SIGNAL PROCESSOR
SGUS020 – JUNE 1996
13
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, CLKMD1 set high, and CLKMD2 set high. The external frequency is divided by two to generate
the internal machine cycle. The external frequency injected must conform to specifications listed in the timing
requirements table.
switching characteristics over recommended operating conditions [H = 0.5 tc(CO)]
PARAMETER
’320C50-50
’320C50-66
UNIT
PARAMETER
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
tc(CO)
Cycle time, CLKOUT1
40
2tc(CI)
30
2tc(CI)
ns
td(CIH-COH/L)
Delay time, X2 / CLKIN high to CLKOUT1 high/low
3
11
20
3
11
20
ns
tf(CO)
Fall time, CLKOUT1
5
ns
tr(CO)
Rise time, CLKOUT1
5
ns
tw(COL)
Pulse duration, CLKOUT1 low
H – 3
H
H + 2
H – 3
H
H + 2
ns
tw(COH)
Pulse duration, CLKOUT1 high
H – 3
H
H + 2
H – 3
H
H + 2
ns
timing requirements over recommended ranges of supply voltage and operating free-air
temperature
’320C50-50
’320C50-66
UNIT
MIN
MAX
MIN
MAX
UNIT
tc(CI)
Cycle time, X2 / CLKIN
20
15
ns
tf(CI)
Fall time, X2 / CLKIN
5
ns
tr(CI)
Rise time, X2 / CLKIN
5
ns
tw(CIL)
Pulse duration, X2 / CLKIN low
8
7
ns
tw(CIH) Pulse duration, X2 / CLKIN high
8
7
ns
This device utilizes a fully static design and therefore can operate with tc(CI) approaching ∞. The device is characterized at frequencies
approaching 0 Hz, but is tested at a minimum of 6.7 MHz to meet device test time requirements.
Values derived from characterization data and not tested.
tr(CO)
tf(CO)
tw(COH)
CLKOUT1
CLKIN
tw(COL)
td(CIH-COH / L)
tf(CI)
tr(CI)
tw(CIL)
tw(CIH)
tc(CO)
tc(CI)
Figure 5. External Divide-by-Two Clock Timing
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