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參數(shù)資料
| 型號： | TMS32C5402PGER10G4 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | FIXED-POINT DIGITAL SIGNAL PROCESSOR |
| 中文描述： | 定點數(shù)字信號處理器 |
| 文件頁數(shù)： | 37/68頁 |
| 文件大?。?/td> | 948K |
| 代理商： | TMS32C5402PGER10G4 |
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SPRS079E – OCTOBER 1998 – REVISED AUGUST 2000
37
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
divide-by-two clock option (PLL disabled)
The frequency of the reference clock provided at the X2/CLKIN pin can be divided by a factor of two to generate
the internal machine cycle. The selection of the clock mode is described in the clock generator section.
When an external clock source is used, the frequency injected must conform to specifications listed in the timing
requirements table.
NOTE:
All revisions of the ’5402 can be operated with an external clock source, provided that the proper
voltage levels be driven on the X2/CLKIN pin. It should be noted that the X2/CLKIN pin is referenced to
the device 1.8V power supply (CVdd), rather than the 3V I/O supply (DVdd). Refer to the recommended
operating conditions section of this document for the allowable voltage levels of the X2/CLKIN pin.
timing requirements (see Figure 11)
MIN
MAX
UNIT
tc(CI)
tf(CI)
tr(CI)
This device utilizes a fully static design and therefore can operate with tc(CI) approaching
∞
. The device is characterized at frequencies
approaching 0 Hz.
Cycle time, X2/CLKIN
20
ns
Fall time, X2/CLKIN
8
ns
Rise time, X2/CLKIN
8
ns
switching characteristics over recommended operating conditions [H = 0.5t
c(CO)
]
(see Figure 10,
Figure 11, and the recommended operating conditions table)
PARAMETER
MIN
10
TYP
MAX
UNIT
tc(CO)
td(CIH-CO)
tf(CO)
tr(CO)
tw(COL)
tw(COH)
This device utilizes a fully static design and therefore can operate with tc(CI) approaching
∞
. The device is characterized at frequencies
approaching 0 Hz.
It is recommended that the PLL clocking option be used for maximum frequency operation.
Cycle time, CLKOUT
2tc(CI)
ns
Delay time, X2/CLKIN high to CLKOUT high/low
4
10
17
ns
Fall time, CLKOUT
2
ns
Rise time, CLKOUT
2
ns
Pulse duration, CLKOUT low
H–2
H
ns
Pulse duration, CLKOUT high
H–2
H
ns
tr(CO)
tf(CO)
CLKOUT
X2/CLKIN
tw(COL)
td(CIH-CO)
tf(CI)
tr(CI)
tc(CO)
tc(CI)
tw(COH)
Figure 11. External Divide-by-Two Clock Timing
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