參數(shù)資料
型號: TSB43AA82A1
廠商: Texas Instruments, Inc.
英文描述: 1394 integrated PHY and link layer controller(1394集成PHY和鏈路層控制器)
中文描述: 1394綜合物理層和鏈路層控制器(1394集成物理層和鏈路層控制器)
文件頁數(shù): 135/146頁
文件大?。?/td> 597K
代理商: TSB43AA82A1
125
Power-Down Mode
XRESETP (1)
ts-2
XRESETL (1)
PD (1)
ENZ (1)
ts-1
Transition
Operational
Mode
Figure 126. Initialization Sequence
Table 121. Reset Timing
ITEM
MIN
TYP
MAX
UNIT
ts-1
20
ms
ts-2
100
ns
12.6 Power-Supply Sequence
When the internal voltage regulator is disabled by setting ENZ to VDD and both voltages are being supplied externally,
there are power sequencing requirements. During power up, the 1.8-V supply (PWTST) should not begin to ramp
up until after the 3.3-V supply (VDD3V, AVD[4:1], VDPLL) reaches at least 2.5 V (see Figure 127). During power
down, the 1.8-V supply should begin to ramp down before the 3.3-V supply (see Figure 128). The exact timing of
the power down is dependant upon the capacitance of the design. At no time during device operation should the 1.8-V
supply have a higher voltage than the 3.3-V supply.
1.8 V
VDD3V
VDD18V
2.5 V
3.3 V
0 V
0 V
Figure 127. Power-Up Sequence
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