ltc1726-5 Linear Technology Corporation, ltc1726-5 Datasheet - Page 6

• Manufacturer Part Number: ltc1726-5
• Description: Triple Supply Monitor And ?p Supervisor With Adjustable Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRA
TI I G DIAGRA S
LTC1726
PI FU CTIO S
RT (Pin 8): Reset Time-Out Input. Place a capacitor
between this pin and ground to adjust the reset time-out
period. To determine the reset time-out period:
6
W U
t
V
U
RST
RT
CCX
= 3.30 • C
V
CC5
U
V
/V
RTX
V
V
CC25
GND
WDI
CC3
CCA
RT
5
1
2
3
4
V
U
t
CC
UV
Monitor Timing
W
W
t
RT
TRANSITION DETECT
1V
1.5V
–
+
–
+
–
+
REFERENCE
BANDGAP
1726 TD01
with t
capacitor will generate a 155ms reset time-out period.
WATCHDOG
TIMER
WDI
RST
RT
in µs and C
22µA
t
WP
ADJUSTABLE
GENERATOR
V
Watchdog Timing Diagram
CC5
POWER
DETECT
RESET
PULSE
+
V
CC3
/V
8
CC25
t
RT
WT
RT
C
RT
in pF. As an example, a 47nF
2µA
t
RT
V
INTERNAL
CC
V
CC3
22µA
2µA
6µA
t
WT
1726 BD
7
6 RST
WT
+
t
RT
C
WT
1.5V
1726 TD02
1726fb