82801FB Datasheet, PDF (755/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Electrical Characteristics
Table 22-21. (Power Sequencing and Reset Signal Timings (Sheet 2 of 2)
Sym
Parameter
Min
Max Units
Fig Notes
PWROK and VRMPWRGD active and
t217 SYS_RESET# inactive to SUS_STAT# inactive
32
and Processor I/F signals latched to strap value
t218
SUS_STAT# inactive to PLTRST# and
PCIRST# inactive
2
t228 ACZ_RST# active low pulse width
t229
ACZ_RST# inactive to ACZ_BIT_CLK startup
delay
1
162.8
22-20
22-21
38
RTCCLK
22-23
22-24
8, 9
22-25
22-26
22-20
22-21
3
RTCCLK
22-23
22-24
9
22-25
22-26
–
us
–
ns
NOTES:
1. The V5REF supply must power up before its associated 3.3 V supply within 0.7 V, and must power down after
the 3.3 V supply within 0.7V. See Section 2.22.3.1 for details.
2. The associated 3.3 V and 1.5 V supplies are assumed to power up or down ‘together’. If the integrated
VccSus1_5 voltage regulator is not used: a) VccSus3_3 must power up before VccSus1_5 or after
VccSus1_5 within 0.7 V, b) VccSus1_5 must power down before VccSus3_3 or after VccSus3_3 within 0.7 V.
3. The VccSus supplies must never be active while the VccRTC supply is inactive.
4. (Mobile Only) – a) VccLan3_3 must power up before VccLAN1_5 or after VccLAN1_5 within 0.7 V, b)
VccLAN1_5 must power down before VccLAN3_3 or after VccLAN3_3 within 0.7V.
5. (Mobile Only) - Vcc or VccLAN supplies must never be active while the VccSus supplies are inactive, and the
Vcc supplies must never be active while the VccLAN supplies are inactive.
6. If the integrated Vcc2_5 voltage regulator is not used: a) Vcc3_3 must power up before Vcc2_5 or after
Vcc2_5 within 0.7 V, b) Vcc2_5 must power down before Vcc3_3 or after Vcc3_3 within 0.7 V.
7. a) Vcc1_5 must power up before V_CPU_IO or after V_CPU_IO within 0.3 V, b) V_CPU_IO must power
down before Vcc1_5 or after Vcc1_5 within 0.7 V.
8. INIT# value determined by value of the CPU BIST Enable bit (Chipset Configuration Register Offset 3414h:
bit 2).
9. These transitions are clocked off the internal RTC. 1 RTC clock is approximately 32 uS.
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
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