參數(shù)資料
型號： Alpha 21164
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Alpha Microprocessor(64位微處理器)
中文描述： 阿爾法微處理器（64位微處理器）
文件頁數(shù)： 105/115頁
文件大?。?/td> 846K
代理商： ALPHA 21164
Electrical Data
105
Power Supply Considerations
11.5.2 Power Supply Sequencing
When applying or removing power to the 21164,
Vdd
(the 3.3-V supply voltage)
must be no less than
Vddi
(the 2.2-V supply voltage).
The following rules must be followed when either applying or removing the supply
voltages:
1.
Vdd
must always be at the same or a higher voltage than
Vddi
during normal
operation.
The
signal voltage
must not exceed
Vclamp
.
The
signal voltage
must not be more than 2.4 V higher than
Vddi
.
Rule 1 means that either
Vdd
and
Vddi
can be brought up and down in unison or
Vddi
can be applied after and removed before
Vdd
.
2.
3.
Rule 2 means that the signal voltage must not be allowed to exceed
Vclamp
during
the application or removal of power. Refer to Table 25 for the value of
Vclamp
. Note
that it is acceptable for the signal voltage either to be held at zero or to follow
Vdd
during the application or removal of power.
Rule 3 means that, if the signal voltage follows
Vdd
, the signal voltage must never
be greater than 2.4 V above the value of
Vddi
. This applies equally during the appli-
cation or the removal of power.
Note that if the signal voltage is held at 0 V during power-up reset (that is, the ASICs
and SRAMs are set to drive 0 V during reset),
Vdd
and
Vddi
can be brought up
together. In a similar manner, the power-down situation can be managed if the signal
voltages are forced to 0 V when the loss of
Vddi
is detected.
During power-up,
Vddi
can momentarily exceed the maximum steady-state value
under the following conditions:
The transient voltage is 200 mV or less.
The transient period lasts for 200 μs or less.
The transient voltage is defined as the voltage that rises above the maximum-allowed
steady-state value. The transient period is defined as the time beginning when the
transient voltage exceeds the steady-state value and ending when it falls back to it.
There is no derating for shorter transient periods or lower transient voltages (for
example, a 400-mV transient voltage lasting for 100 μs is not acceptable).
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