參數(shù)資料
型號(hào)： pentium II
廠商： Intel Corp.
英文描述： pentium II processor With On-die Cache Mobile Module Connector 1 (MMC-1)(帶緩存和連接器1的奔II處理器)
中文描述： 奔騰II處理器芯片上緩存手機(jī)模塊連接器1（MMC管理- 1）（帶緩存和連接器1的奔二處理器）
文件頁(yè)數(shù)： 33/34頁(yè)
文件大?。?/td> 582K
代理商： PENTIUM II
33
Intel
a
Pentium
a
II Processor With On-die Cache Mobile Module MMC-1
Figure 9 shows a SPICE simulation of the circuit in Figure 8.
To increase the reliability of the Tantalum capacitors, use a
slew-rate control circuit as described in Figure8 and voltage
derate the capacitor about 50 percent. For example, for a
maximum input voltage of 18 volts, use a 35-volt, low ESR
capacitor with high ripple current capability. Place five, 22-
microfarad/35-volt capacitors on the baseboard directly at
the V_DC pins of the connector.
The slew-rate control circuit should also be applied to every
input power source to the system V_DC to provide the most
protection. If all power is logically “OR’ed” together at the
PWR node, there is still a potential problem. For example, if
a 3X3 Li-Ion battery pack is powering the system (12 volts at
PWR), and the AC Adaptor (18 volts) is plugged into the
system, it will immediately source current to the PWR node
and V_DC rapidly. This is because the slew-rate control is
already ON. Therefore, the slew-rate control must be applied
to every input power source to provide the most protection.
Figure 9. Spice Simulation Using In-rush Protection
-
Example Only
4.7.4.2
Undervoltage Lockout: Circuit Description
(V_uv_lockout)
The circuit shown in Figure 8 provides an undervoltage
protection and locks out the applied voltage to the module to
prevent an accidental turn-on at low voltage. The output of
this circuit, pin 1 of the LM339 comparator, is an open-
collector output. It is low when the applied voltage at PWR is
less than 4.75 volts. This voltage can be calculated with the
following equation with the voltage across D7 as 2.5 volts
(D7 is a 2.5-volt reference generator).
V_uv_lockout
Vre.
R17
R1.
R18
R25
=
V_uv_lockout
4.757 volts
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