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

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

does the IC’s ability to sink current at RESET. Also, with

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

Ultra-Low-Voltage SC70 Voltage Detectors

and µP Reset Circuits

8

_______________________________________________________________________________________

RESET

GND

RESET

INPUT

MAX6834

MAX6837

MAX6840

5V SYSTEM

GND

+1.2V

+5.0V

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