Power-Supply Monitor with Reset
MAX700/MAX701/MAX702
MR
1
1MΩ
8
V
CC
7
COMPARATOR
SENSE
2
150kΩ
CTL
MANUAL
RESET
BUTTON
1
N.C.
2
3
MR
SENSE
HYST
GND
MAX700
V
CC
CTL
RESET
RESET
8
7
6
5
+5V
MAX700
1.29V REF
R
RC
6
R OSC
HYST
3
5
4
RESET
RESET
N.C.
TO
µP
4
GND
Figure 1. MAX700 Block Diagram
Figure 2. MAX700 Typical Connection Diagram
MANUAL
RESET
BUTTON
1
R1
V
IN
R2
R3
3
4
HYST
GND
RESET
RESET
6
5
N.C.
TO
µP
2
MR
SENSE
MAX700
V
CC
CTL
8
7
V
IN
3V TO 15V
RESET
2V/div
0V
V
CC
R1 = R2
V
L
- 1 V
L
= LOWER VOLTAGE THRESHOLD
1.29
V
T
R1
R3 =
V = UPPER VOLTAGE THRESHOLD
V
U
- V
L U
2V/div
(
)
0V
1s/div
HYSTERESIS = V
U
- V
L
Figure 3. MAX700 Connected for External Senses and
Hysteresis
Figure 4. Typical MAX700/MAX701/MAX702 RESET Output vs. V
CC
Figure 4 shows the
RESET
output of the MAX700/
MAX701/MAX702 in the correct state for V
CC
voltages
down to 0V. Note the effect of the built-in hysteresis on
the trigger lever of
RESET.
Package Information
For the latest package outline information, go to
www.maxim-ic.com/packages.
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
