Datasheet

MAX6832–MAX6840
Ultra-Low-Voltage SC70 Voltage Detectors
and µP Reset Circuits
8
Maxim Integrated
Using The MAX6834/MAX6837/MAX6840
Open-Drain
RESET Output
with Multiple Supplies
Generally, the pullup connected to the MAX6834/
MAX6837/MAX6840 will connect to the supply voltage
that is being monitored at the IC’s V
CC
pin. However,
some systems may use the open-drain output to level-
shift from the monitored supply to reset circuitry pow-
ered by some other supply (Figure 5). Note that as the
MAX6834/MAX6837/MAX6840’s V
CC
decreases, so
does the IC’s ability to sink current at RESET. Also, with
any pullup, RESET will be pulled high as V
CC
declines
toward 0. The voltage where this occurs depends on
the pullup resistor value and the voltage to which it is
connected.
Chip Information
TRANSISTOR COUNT: 681
PROCESS: BiCMOS
RESET
GND
RESET
INPUT
R
PULLUP
MAX6834
MAX6837
MAX6840
5V SYSTEM
GND
V
CC
+1.2V
+5.0V
V
CC
Figure 5. Using The MAX6834/MAX6837/MAX6840 Open-Drain
RESET Output with Multiple Supplies
Table 2. Active Timeout Period Guide
SUFFIX
TYPICAL RESET ACTIVE
TIMEOUT PERIOD (ms)
D0 0.07
D1 1.5
D2 30
D3 210
D4 1680
Table 3. Standard Versions
DEVICE TOP MARK
MAX6832VXRD0 AIQ
MAX6832VXRD3 AIR
MAX6832HXRD0 AIS
MAX6832HXRD3 AIT
MAX6832FXRD0 AIU
MAX6832FXRD3 AIV
MAX6833VXRD0 AHJ
MAX6833VXRD3 AIW
MAX6833HXRD0 AIX
MAX6833HXRD3 AIY
MAX6833FXRD0 AIZ
MAX6833FXRD3 AJA
MAX6834VXRD0 AJB
MAX6834VXRD3 AJC
MAX6834HXRD0 AJD
MAX6834HXRD3 AJE
MAX6834FXRD0 AJF
MAX6834FXRD3 AJG
MAX6835VXSD0 AEX
Table 1. Threshold Suffix Guide
Selector Guide
SUFFIX RESET THRESHOLD (V)
W 1.665
V 1.575
I 1.388
H 1.313
G 1.110
F 1.050