w83l784r Winbond Electronics Corp America, w83l784r Datasheet - Page 17

• Manufacturer Part Number: w83l784r
• Description: Winbond H/w Monitoring Ic
• Manufacturer: Winbond Electronics Corp America

6.3.2 Power good for 3V and 5V
rise, RESET# remains asserted.
becomes a logic high after a time equal to the reset pulse width (tRST, typically 200ms).(Figure 11).
If a power fail or a brownout happens(i.e. 3V or VCC(5V) drops below the threshold), RESET# output
is asserted. As long as the 3V and VCC(5V) remain below the reset threshold, RESET# output
remains asserted. Therefore, a brownout condition that interrupts a previously initiated reset pulse
causes an additional 200ms delay from the time the latest interruption occurred. On power-on, once
3Vor VCC(5V) drops below the reset threshold, RESET# are guaranteed to be asserted for VCC
3.3V
VCC
RESET
4
3
2
1
0
5
4
3
2
1
0
Confidential, For Beta-site Only
5
0
On power up, once VCC(5V) reaches 1V, RESET# will be a logic low. As 3V and VCC(5V)
V
tRST
RST
V
RST
V
in
V
V
RST
RST
If 3V and VCC(5V) both exceed the reset threshold, RESET
VCC
where VCC is set to 5V.
50
-16 -
Figure 11
K
50
K
34
K
VCC
RESET
5
4
3
2
1
0
5
0
2 98
.
V
tRST
Publication Release Date: Sep.
V
RS
T
The time of voltage over 4V
is less than tRST
W83L784R
Preliminary
Revision 0.54
V
RS
T
1999
1V.
V
RS
T
tRST