MAX700/MAX701/MAX702
Power-Supply Monitor with Reset
4 _______________________________________________________________________________________
Pin Description
PIN
MAX700 MAX701 MAX702
NAME FUNCTION
111MR
Input for Manual Pushbutton Reset. Has internal 5µA pullup. Low input activates the
RESET/RESET outputs.
2 — — SENSE
The voltage-sense input when CTL = V
CC
. Its threshold is 1.29V. SENSE always
remains connected to the internal comparator. So, when V
CC
is being monitored
internally (CTL = GND), SENSE should be left open circuit.
3 — — HYST
Normally NOT used when voltage is monitored through V
CC
(CTL = GND). When
monitoring through SENSE (CTL = V
CC
), HYST allows hysteresis to be added,
reducing noise and spurious reset activity (Figure 3). HYST turns on 5µs before the
RESET/RESET outputs are activated, and its on-resistance to GND is typically 1kΩ.
4 4 3 GND Ground
567RESET
Goes low when V
CC
falls below 4.65V, or when CTL = V
CC
on the MAX700 goes low
when SENSE falls below 1.29V.
6 5 — RESET Inverted Version of RESET
7 — — CTL
When C TL = GN D , V
C C
i s m oni tor ed b y the r eset ci r cui t. When C TL = V
C C
, V
C C
i s i g nor ed
and S E N S E i s m oni tor ed , al l ow i ng the thr eshol d to b e set w i th exter nal r esi stor s.
882V
CC
Chip Power and +5V Sensing Input (When CTL = GND on MAX700)
— 2, 3, 7 4, 5, 6, 8 N.C. No Connection
