Detailed Description

Supply Voltages

The MAX6730–MAX6735 microprocessor (µP) supervi-

sors maintain system integrity by alerting the µP to fault

conditions. The MAX6730–MAX6735 monitor one to

three supply voltages in µP-based systems and assert

an active-low reset output when any monitored supply

voltage drops below its preset threshold. The output

Threshold Levels

The two-letter code in the Reset Voltage Threshold

Suffix Guide (Table 1) indicates the threshold level

Reset Output

The MAX6730–MAX6735 feature an active-low reset out-

drops below its threshold, or MR is driven low (Figure 1).

RST remains low for the reset timeout period (Table 2)

respective thresholds and after MR releases high.

threshold before the end of the reset timeout period, the

internal timer restarts. The MAX6730/MAX6732/ MAX6734

provide an open-drain RST output, and the MAX6731/

MAX6733/MAX6735 provide a push-pull RST output.

Single-/Dual-/Triple-Voltage µP Supervisory

Circuits with Independent Watchdog Output

8

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Table 1. Reset Voltage Threshold Suffix Guide**

PART NO. SUFFIX

VOLTAGE

THRESHOLD(V)

VOLTAGE

THRESHOLD (V)

LT

4.625

3.075

MS

4.375

2.925

MR

4.375

2.625

TZ

3.075

2.313

SY

2.925

2.188

RY

2.625

2.188

TW

3.075

1.665

SV

2.925

1.575

RV

2.625

1.575

TI

3.075

1.388

SH

2.925

1.313

RH

2.625

1.313

TG

3.075

1.110

SF

2.925

1.050

RF

2.625

1.050

TE

3.075

0.833

SD

2.925

0.788

RD

2.625

0.788

ZW

2.313

1.665

YV

2.188

1.575

ZI

2.313

1.388

YH

2.188

1.313

ZG

2.313

1.110

YF

2.188

1.050

ZE

2.313

0.833

YD

2.188

0.788

WI

1.665

1.388

VH

1.575

1.313

WG

1.665

1.110

VF

1.575

1.050

WE

1.665

0.833

VD

1.575

0.788

**Standard versions are shown in bold and are available in a

D3 timeout option only. Standard versions require 2500-piece

order increments and are typically held in sample stock. There

is a 10,000-piece order increment on nonstandard versions.

Other threshold voltages may be available; contact factory

for availability.

Table 2. Reset Timeout Period Suffix Guide

ACTIVE TIMEOUT PERIOD

TIMEOUT

PERIOD SUFFIX

MIN (ms)

MAX (ms)

D1

1.1

2.2

D2

8.8

17.6

D3

140

280

D5

280

560

D6

560

1120

D4

1120

2240