MAX6422US37-T Maxim Integrated, MAX6422US37-T Datasheet

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MAX6422US37-T

Manufacturer Part Number
MAX6422US37-T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6340, MAX6421, MAX6422, MAX6423, MAX6424, MAX6425, MAX6426r
Datasheet

Specifications of MAX6422US37-T

Number Of Voltages Monitored
1
Monitored Voltage
1.6 V to 5 V
Undervoltage Threshold
3.608 V
Overvoltage Threshold
3.793 V
Output Type
Active High, Push-Pull
Manual Reset
Not Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
4.375 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
SOT-143
Chip Enable Signals
No
Maximum Power Dissipation
320 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
2.5 uA
Supply Voltage - Min
1 V
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
age falls below its reset threshold. The reset output
remains asserted for the reset timeout period after V
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.
19-2440; Rev 4; 12/05
Typical Operating Circuit appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Pin Configurations continued at end of data sheet.
Portable Equipment
Battery-Powered Computers/Controllers
Automotive
Medical Equipment
Intelligent Instruments
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
TOP VIEW
Low-Power, SC70/SOT µP Reset Circuits with
GND
V
CC
________________________________________________________________ Maxim Integrated Products
( ) ARE FOR THE MAX6422
1
2
Capacitor-Adjustable Reset Timeout Delay
MAX6421X
MAX6422X
MAX6423X
SC70
General Description
Pin Configurations
4
3
Applications
RESET
(RESET)
SRT
CC
supply volt-
CC
♦ Monitor System Voltages from 1.6V to 5V
♦ Capacitor-Adjustable Reset Timeout Period
♦ Low Quiescent Current (1.6µA typ)
♦ Three RESET Output Options
♦ Guaranteed Reset Valid to V
♦ Immune to Short V
♦ Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23
♦ MAX6340 Pin Compatible with LP3470
♦ MAX6424/MAX6425 Pin Compatible with
♦ MAX6426 Pin Compatible with PST92XX
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.
MAX6340UK_ _-T
MAX6421XS_ _-T
MAX6421US_ _-T
MAX6422XS_ _-T
MAX6422US_ _-T
MAX6423XS_ _-T
MAX6423US_ _-T
MAX6424UK_ _-T
MAX6425UK_ _-T
MAX6426UK_ _-T
Packages
NCP300–NCP303, MC33464/MC33465,
S807/S808/S809, and RN5VD
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
PART
-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
Ordering Information
TEMP RANGE
CC
Transients
CC
= 1V
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
Features
1

Related parts for MAX6422US37-T

MAX6422US37-T Summary of contents

Page 1

... SC70 ( ) ARE FOR THE MAX6422 Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ♦ Monitor System Voltages from 1. ♦ Capacitor-Adjustable Reset Timeout Period supply volt- ♦ ...

Page 2

Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND V ........................................................................-0.3V to +6.0V CC SRT, RESET, RESET (push-pull).................-0. RESET (open drain)...............................................-0.3V to +6.0V Input Current (all pins)......................................................±20mA Output Current ...

Page 3

Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay ( 1500pF +25°C, unless otherwise noted.) CC SRT A SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.0 3 +125° +25°C ...

Page 4

... The reset output is typically connected to the reset input of a µP. A µP’s reset input starts or restarts the µ known state. The MAX6340/MAX6421–MAX6426 µP supervisory circuits provide the reset logic to prevent code-execution errors during power-up, power-down, and brownout conditions (see Typical Operating Characteristics) ...

Page 5

Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay 275µs) / (2.73 SRT RP where seconds and C RP SRT The reset delay time is set by a current/capacitor-con- trolled ramp compared ...

Page 6

Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay V CC MAX6421 MAX6424 RESET GND Figure 3. Ensuring RESET Valid MAX6422 RESET GND Figure 4. Ensuring RESET Valid ...

Page 7

Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay PART* OUTPUT STAGE Open-Drain RESET MAX6340UK16-T Open-Drain RESET MAX6340UK22-T Open-Drain RESET MAX6340UK26-T Open-Drain RESET MAX6340UK29-T Open-Drain RESET MAX6340UK46-T Push-Pull RESET MAX6421US16-T Push-Pull RESET MAX6421XS16-T Push-Pull RESET MAX6421US22-T Push-Pull RESET MAX6421XS22-T ...

Page 8

Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay TOP VIEW SRT GND N.C. GND V CC PUSH-PULL RESET PART MAX6340 — ✔ MAX6421 MAX6422 — MAX6423 — ✔ MAX6424 MAX6425 — 8 _______________________________________________________________________________________ Pin Configurations (continued ...

Page 9

Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) _______________________________________________________________________________________ Package Information PACKAGE OUTLINE, 4L SC70 ...

Page 10

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products ...

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