MAX6340_05 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Low-Power, SC70/SOT μP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay

19-2440; Rev 4; 12/05
Low-Power, SC70/SOT µP Reset Circuits with
Capacitor-Adjustable Reset Timeout Delay
General Description
The MAX6340/MAX6421–MAX6426 low-power micro-
processor 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 volt-
age 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 exter-
nally 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
Typical Operating Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
V_{CC 1}
GND 2
MAX6421X
MAX6422X
MAX6423X
4 RESET
(RESET)
3 SRT
SC70
( ) ARE FOR THE MAX6422
Pin Configurations continued at end of data sheet.
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
Ordering Information
PART
MAX6340UK_ _-T
MAX6421XS_ _-T
MAX6421US_ _-T
MAX6422XS_ _-T
MAX6422US_ _-T
MAX6423XS_ _-T
MAX6423US_ _-T
MAX6424UK_ _-T
MAX6425UK_ _-T
MAX6426UK_ _-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
5 SOT23-5
4 SC70-4
4 SOT143-4
4 SC70-4
4 SOT143-4
4 SC70-4
4 SOT143-4
5 SOT23-5
5 SOT23-5
5 SOT23-5
Note: The MAX6340/MAX6421–MAX6426 are available with fac-
tory-trimmed reset thresholds from 1.575V to 5.0V in approxi-
mately 0.1V increments. Insert the desired nominal reset
threshold suffix (from Table 1) into the blanks. There are 50 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on standard versions only (see
Standard Versions Table). Required order increment is 10,000
pieces for nonstandard versions. Contact factory for availability.
All devices are available in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing "-T" with "+T" when ordering.
Selector Guide appears at end of data sheet.
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