General Description
The MAX6340/MAX6421–MAX6426 low-power micropro-
cessor supervisor circuits monitor system voltages from
1.6V to 5V. These devices perform a single function: they
assert a reset signal whenever the V
CC
supply voltage
falls below its reset threshold. The reset output remains
asserted for the reset timeout period after V
CC
rises
above the reset threshold. The reset timeout is externally
set by a capacitor to provide more flexibility.
The MAX6421/MAX6424 have an active-low, push-
pull reset output. The MAX6422 has an active-high, push-
pull reset output and the MAX6340/MAX6423/ MAX6425/
MAX6426 have an active-low, open-drain reset output.
The MAX6421/MAX6422/MAX6423 are offered in 4-pin
SC70 or SOT143 packages. The MAX6340/MAX6424/
MAX6425/MAX6426 are available in 5-pin SOT23-5
packages.
Applications
●
Portable Equipment
●
Battery-Powered Computers/Controllers
●
Automotive
●
Medical Equipment
●
Intelligent Instruments
●
Embedded Controllers
●
Critical µP Monitoring
●
Set-Top Boxes
●
Computers
Benefits and Features
●
Monitor System Voltages from 1.6V to 5V
●
Capacitor-Adjustable Reset Timeout Period
●
Low Quiescent Current (1.6µA typ)
●
Three RESET Output Options
Push-Pull
RESET
Push-Pull
RESET
Open-Drain
RESET
●
Guaranteed Reset Valid to V
CC
= 1V
●
Immune to Short V
CC
Transients
●
Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23
Packages
●
MAX6340 Pin Compatible with LP3470
●
MAX6424/MAX6425 Pin Compatible with
NCP300–NCP303, MC33464/MC33465,
S807/S808/S809, and RN5VD
●
MAX6426 Pin Compatible with PST92XX
●
AEC-Q100 Qualified (MAX6340UK31/V+T)
19-2440; Rev 9; 3/18
, and
appear at end of data sheet.
Pin Configurations continued at end of data sheet.
GND
( ) ARE FOR THE MAX6422
V
CC
1
4
SRT
MAX6421X
MAX6422X
MAX6423X
SC70
TOP VIEW
2
3
RESET
(RESET)
MAX6340/MAX6421–
MAX6426
Low-Power, SC70/SOT µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
Pin Configurations
Click
