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W83627DHG
Publication Release Date: Aug, 22, 2007
-169- Version
1.4
SYMBOL PARAMETER MIN.
TYP.
MAX.
UNIT
NOTE
V1
3VSB Valid Voltage
2.4
2.6
2.75
V
For both UBC and
UBE version
V2
3VSB Ineffective Voltage
2.25
2.4
2.55
V
For both UBC and
UBE version
V1
3VSB Valid Voltage
-
-
3.1
V
For UBF version
V2
3VSB Ineffective Voltage
2.4
-
-
V
For UBF version
t1
Valid 3VSB to RSMRST# inactive
100
-
200
mS
Table 14.2
14.4 PWROK Generation
The PWROK (Pin 71) signal is an output and is used as the 3VCC power-on reset signal.
When the W83627DHG detects the 3VCC voltage rises to “V3”, it then starts a delay – “t2” before the
rising edge of PWROK asserting. If the 3VCC voltage falls below “V4”, the PWROK de-asserts
immediately.
Timing and voltage parameters are shown in Figure 14.6 and Table 14.3.
t2
V3
V4
PWROK
3VCC
Figure 14.6
SYMBOL PARAMETER MIN.
TYP.
MAX.
UNIT
NOTE
V3
3VCC Valid Voltage
2.4
2.6
2.75
V
For both UBC and UBE
version
V4
3VCC Ineffective Voltage
2.25
2.4
2.55
V
For both UBC and UBE
version
V3
3VCC Valid Voltage
-
-
3.1
V
For UBF version
V4
3VCC Ineffective Voltage
2.4
-
-
V
For UBF version
t2
Valid 3VCC to PWROK active
300
-
500
mS
Table 14.3
Originally, the t2 timing is between 300 mS to 500 mS, but it can be changed to 200 mS to 300 mS by
programming Logical Device A, CR[E6h], bit 3 to “1”. Furthermore, the W83627DHG provides four
different extra delay time of PWROK for various demands. The four extra delay time are designed at
Содержание W83627DHG
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