參數(shù)資料
型號(hào)： pentium II cpu with mobile
廠商： Intel Corp.
英文描述： pentium II processor With On-die Cache Mobile Module Connector 2 (MMC-2)(帶緩存和連接器2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2（絲裂霉素2）（帶緩存和連接器2的奔二處理器）
文件頁(yè)數(shù)： 37/48頁(yè)
文件大?。?/td> 537K
代理商： PENTIUM II CPU WITH MOBILE
Intel
a
Pentium
a
II Processor With On-Die Cache Mobile Module MMC-2
37
Figure 8 shows a SPICE simulation of the circuit in Figure 7.
To increase the reliability of tantalum capacitors, use a slew-
rate control circuit described in Figure 7 and voltage derate
the capacitor about 50 percent. That is, for a maximum input
voltage of 18.0 volts, use a 35.0-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 processor module connector. Finally, the slew-rate
control circuit should be applied to every input power source
to the system V_DC to provide the most protection. A
potential problem still exists if all power sources are “l(fā)ogically
OR’ed” together at the PWR node. For example, the system
will immediately source current to the PWR node and V_DC
if a 3X3 Li-Ion battery pack is powering the system (12.0
volts at PWR) and the AC Adaptor (18.0 volts) is plugged
into the system. 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 Pentium II
processor with on-die cache mobile module MMC-2 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 volt
4.7.4.3
Overvoltage Lockout: Circuit Description
(V_ov_lockout)
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