Datasheet

MAX700/MAX701/MAX702
Power-Supply Monitor with Reset
_______________________________________________________________________________________ 5
Figure 1. MAX700 Block Diagram
RESET
1MΩ
1.29V REF
OSC
RC
R
R
COMPARATOR
RESET
GND
1
2
8
7
V
CC
CTL
SENSE
HYST
150kΩ
MR
3
4
6
5
MAX700
GND
1
2
8
7
SENSE
MANUAL
RESET
BUTTON
HYST
MR
3
4
6
N.C.
N.C.
TO µP
+5V
5
MAX700
RESET
RESET
V
CC
CTL
GND
1
2
8
7
SENSE
MANUAL
RESET
BUTTON
HYST
MR
3
4
6
N.C.
R1
R3R2
V
IN
TO µP
V
IN
3V TO 15V
V
L
= LOWER VOLTAGE THRESHOLDR1 = R2
(
V
L
- 1
)
1.29
R3 =
V
T
R1
V
U
- V
L
V
U
= UPPER VOLTAGE THRESHOLD
HYSTERESIS = V
U
- V
L
5
MAX700
RESET
RESET
V
CC
CTL
RESET
0V
0V
2V/div
2V/div
1s/div
V
CC
Figure 4. Typical MAX700/MAX701/MAX702 RESET Output vs. V
CC
Figure 2. MAX700 Typical Connection Diagram
Figure 3. MAX700 Connected for External Senses and
Hysteresis
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.