82801DB Datasheet, PDF (537/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

Electrical Characteristics
Table 17-19. Power Sequencing and Reset Signal Timings
Sym
Parameter
t170 VccRTC active to RTCRST# inactive
t171
V5RefSus active to VccSus3_3, VccSus1_5
active
t172
VccRTC supply active to VccSus supplies
active
t173
VccSus supplies active to LAN_RST# active,
RSMRST# inactive
t174 V5Ref active to Vcc3_3, Vcc1_5, VccHI active
t175 VccSus supplies active to Vcc supplies active
t176
Vcc supplies active to PWROK, VRMPWRGD
active
t177
PWROK and VRMPWRGD and
SYS_RESET#inactive to SUS_STAT# inactive
t178 SUS_STAT# inactive to PCIRST# inactive
t179 AC_RST# active low pulse width
t180 AC_RST# inactive to BIT_CLK startup delay
Min
5
0
0
10
0
0
10
32
1
1
162.8
Max Units
—
ms
Notes
Fig
17-18
—
ms 1
17-18
—
ms 2
—
ms
—
ms 1
—
ms 2
—
ms
38 RTCCLK
3 RTCCLK
us
ns
17-18
17-18
17-20
17-18
17-18
17-18
17-20
17-20
17-20
NOTES:
1. The V5Ref supply must power up before or simultaneous with its associated 3.3 V supply, and must power
down simultaneous with or after the 3.3 V supply. See Section 2.20.3 for details.
2. The VccSus supplies must never be active while the VccRTC supply is inactive. Likewise, the Vcc supplies
must never be active while the VccSus supplies are inactive.
Intel^® 82801DB ICH4 Datasheet
537