MAX6730A–MAX6735A
Detailed Description
Supply Voltages
The MAX6730A–MAX6735A microprocessor (µP) super-
visors maintain system integrity by alerting the µP to fault
conditions. The MAX6730A–MAX6735A 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
state remains valid for V
CC
1 or V
CC
2 greater than +0.8V.
Threshold Levels
The two-letter code in the Reset Voltage Threshold
Suffix Guide (Table 1) indicates the threshold level
combinations for V
CC
1 and V
CC
2.
Reset Output
The MAX6730A–MAX6735A feature an active-low reset
output (RST). RST asserts when the voltage at either
V
CC
1 or V
CC
2 falls below the voltage threshold level,
V
RSTIN
drops below its threshold, or MR is driven low
(Figure 1). RST remains low for the reset timeout period
(Table 2) after V
CC
1, V
CC
2, and RSTIN increase above
their respective thresholds and after MR releases high.
Whenever V
CC
1, V
CC
2, or RSTIN go below the reset
threshold before the end of the reset timeout period, the
internal timer restarts. The MAX6730A/MAX6732A/
MAX6734A provide an open-drain RST output, and the
MAX6731A/MAX6733A/MAX6735A provide a push-pull
RST output.
Single-/Dual-/Triple-Voltage µP Supervisory
Circuits with Independent Watchdog Output
8 _______________________________________________________________________________________
Table 1. Reset Voltage Threshold Suffix Guide**
**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
