MAX6723UTSHD6-T Maxim Integrated, MAX6723UTSHD6-T Datasheet

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MAX6723UTSHD6-T

Manufacturer Part Number
MAX6723UTSHD6-T
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX6715, MAX6716, MAX6717, MAX6718, MAX6719, MAX6720, MAX6721, MAX6722, MAX6723, MAX6724, MAX6725, MAX6726, MAX6727, MAX6728, MAX6729r
Datasheet

Specifications of MAX6723UTSHD6-T

Number Of Voltages Monitored
3
Monitored Voltage
1.8 V to 5 V, 0.9 V to 3.3 V
Undervoltage Threshold
2.85 V, 1.275 V, Adjustable
Overvoltage Threshold
3 V, 1.35 V, Adjustable
Output Type
Active Low, Open Drain
Manual Reset
Not Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
840 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23
Chip Enable Signals
No
Maximum Power Dissipation
696 mW
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Supply Current (typ)
15 uA
Supply Voltage - Min
0.8 V
The MAX6715–MAX6729 are ultra-low-voltage microproces-
sor (µP) supervisory circuits designed to monitor two or three
system power-supply voltages. These devices assert a sys-
tem reset if any monitored supply falls below its factory-
trimmed or adjustable threshold and maintain reset for a
minimum timeout period after all supplies rise above their
thresholds. The integrated dual/triple supervisory circuits sig-
nificantly improve system reliability and reduce size com-
pared to separate ICs or discrete components.
These devices monitor primary supply voltages (V
1.8V to 5.0V and secondary supply voltages (V
0.9V to 3.3V with factory-trimmed reset threshold voltage
options (see Reset Voltage Threshold Suffix Guide). An
externally adjustable RSTIN input option allows customers to
monitor a third supply voltage down to 0.62V. These devices
are guaranteed to be in the correct reset output logic state
when either V
A variety of push-pull or open-drain reset outputs along with
watchdog input, manual reset input, and power-fail input/out-
put features are available (see Selector Guide). Select reset
timeout periods from 1.1ms to 1120ms (min) (see Reset
Timeout Period Suffix Guide). The MAX6715–MAX6729 are
available in small 5, 6, and 8-pin SOT23 packages and oper-
ate over the -40°C to +85°C temperature range.
19-2325; Rev 5; 12/05
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.
UNREGULATED
DC
Multivoltage Systems
Telecom/Networking Equipment
Computers/Servers
Portable/Battery-Operated Equipment
Industrial Equipment
Printer/Fax
Set-Top Boxes
R1
R2
CC
IN
PUSHBUTTON
SWITCH
1 or V
CONVERTER
Typical Operating Circuit
DC/DC
________________________________________________________________ Maxim Integrated Products
Dual/Triple Ultra-Low-Voltage SOT23 µP
CC
OUT2
OUT1
2 remains greater than 0.8V.
General Description
RSTIN/PFI
MR
V
CC
MAX67_ _
1
V
CC
Applications
2
RST
WDI
PFO
RESET
I/O
NMI
SUPPLY
I/O
CC
1.8V
CC
µP
SUPPLY
2) from
CORE
1) from
0.9V
♦ V
♦ V
♦ Externally Adjustable RSTIN Threshold for
♦ Watchdog Timer Option
♦ Manual Reset Input Option
♦ Power-Fail Input/Power-Fail Output Option
♦ Guaranteed Reset Valid Down to V
♦ Reset Output Logic Options
♦ Immune to Short V
♦ Low Supply Current 14µA (typ) at 3.6V
♦ Small 5, 6, and 8-Pin SOT23 Packages
Note: The first “_ _” are placeholders for the threshold voltage
levels of the devices. Desired threshold levels are set by the part
number suffix found in the Reset Voltage Threshold Suffix Guide.
The “_” after the D is a placeholder for the reset timeout delay
time. Desired delay time is set using the timeout period suffix
found in the Reset Timeout Period Suffix Guide. For example the
MAX6716UTLTD3-T is a dual-voltage supervisor V
V
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing "-T" with "+T" when ordering.
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
MAX6715UT_ _D_ -T
MAX6716UT_ _D_ -T
MAX6717UK_ _D_ -T
MAX6718UK_ _D_ -T
MAX6719UT_ _D_ -T
MAX6720UT_ _D_ -T
TH
from 1.58V to 4.63V
Voltages from 0.79V to 3.08V
Auxiliary/Triple-Voltage Monitoring
(0.62V internal reference)
(Push-Pull and Open-Drain Active-Low)
V
2 = 3.075V, and 210ms (typ) timeout period.
CC
CC
CC
35s (min) Long Startup Period
1.12s (min) Normal Timeout Period
Supervisory Circuits
1 (primary supply) Reset Threshold Voltages
2 (secondary supply) Reset Threshold
2 = 0.8V
PART
Ordering Information
CC
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Transients
CC
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
Features
1 or
TH
1 = 4.625V,
1

Related parts for MAX6723UTSHD6-T

MAX6723UTSHD6-T Summary of contents

Page 1

... RSTIN/PFI MR R2 MAX67_ _ PUSHBUTTON SWITCH ________________________________________________________________ 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. Supervisory Circuits ♦ from 1.58V to 4.63V ♦ Voltages from 0.79V to 3.08V ♦ ...

Page 2

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND ..........................................................-0. RST, RST1, RST2, PFO, RST ................-0.3V to +6V Open-Drain Push-Pull RST, RST1, PFO, RST...............-0. Push-Pull RST2 .........................................-0. RSTIN, PFI, MR, WDI ................................................-0.3V to +6V Input Current/Output Current (all pins) ...............................20mA Stresses beyond those listed under “ ...

Page 3

... MR to Reset Delay MR Pullup Resistance WATCHDOG INPUT (MAX6721–MAX6729) Watchdog Timeout Period WDI Pulse Width WDI Input Voltage WDI Input Current _______________________________________________________________________________________ Supervisory Circuits = -40°C to +85°C, unless otherwise noted. Typical values are CONDITIONS 100m ...

Page 4

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 0.8V to 5.5V, GND = PARAMETER SYMBOL RESET/POWER-FAIL OUTPUTS RST/RST1/RST2/PFO Output LOW V (Push-Pull or Open-Drain) RST/RST1/PFO Output HIGH V (Push-Pull Only) RST2 Output HIGH V (Push-Pull Only) RST Output HIGH V (Push-Pull Only) RST Output LOW ...

Page 5

... TEMPERATURE (°C) NORMALIZED V RESET THRESHOLD CC vs. TEMPERATURE 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 -40 - TEMPERATURE (°C) _______________________________________________________________________________________ Supervisory Circuits Typical Operating Characteristics SUPPLY CURRENT vs. TEMPERATURE 3.3V 2. TOTAL ...

Page 6

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits ( 5V 3.3V +25°C, unless otherwise noted RESET INPUT TO RESET OUTPUT DELAY vs. TEMPERATURE 24.4 30mV OVERDRIVE 24.2 24.0 23.8 23.6 23.4 23.2 23.0 22.8 -40 - TEMPERATURE (°C) MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6716 MAX6718 MAX6720 MAX6722 _______________________________________________________________________________________ Typical Operating Characteristics (continued) POWER-FAIL INPUT TO POWER-FAIL OUTPUT DELAY vs ...

Page 7

... Dual/Triple Ultra-Low-Voltage SOT23 µP MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6716 MAX6718 MAX6720 MAX6722 5 — — _______________________________________________________________________________________ Supervisory Circuits PIN MAX6723/ MAX6725/ MAX6727 MAX6724 MAX6726 — — — — — Pin Description (continued) ...

Page 8

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits MAX6715/ MAX6717/ MAX6719/ MAX6721/ MAX6716 MAX6718 MAX6720 MAX6722 — — — — — 5 — — — 8 _______________________________________________________________________________________ PIN MAX6723/ MAX6725/ MAX6727 MAX6724 MAX6726 — — — — — Pin Description (continued) NAME ...

Page 9

... above 0.8V Threshold Levels Input voltage threshold level combinations are indicat two-letter code in the Reset Voltage Threshold _______________________________________________________________________________________ Supervisory Circuits PIN MAX6723/ MAX6725/ MAX6727 MAX6724 MAX6726 — — — — ...

Page 10

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits restarts. The MAX6715/MAX6717/MAX6719/MAX6721/ MAX6723/MAX6725/MAX6727/MAX6728 contain open- drain reset outputs, while the MAX6716/MAX6718/ MAX6720/MAX6722/MAX6724/MAX6726/MAX6729 contain push-pull reset outputs. The MAX6727 provides two separate open-drain RST outputs driven by the same internal logic. Manual Reset Input Many microprocessor-based products require manual reset capability, allowing the operator, a test techni- cian, or external logic circuitry to initiate a reset ...

Page 11

... For most applications, 100kΩ is adequate. This config- uration does not work for the open-drain outputs of the MAX6715/MAX6717/MAX6719/MAX6721/MAX6723/ MAX6725/MAX6727/MAX6728. For push-pull, active- high RST output connect the external resistor as a pullup from RST ______________________________________________________________________________________ Supervisory Circuits ...

Page 12

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits PFO V MAX6728/ EXT MAX6729 R1 PFI PFO V = DESIRED V GOOD EXT DESIRED V FAIL EXT (FOR PUSH-PULL PFO 200kΩ (FOR > 2.5µA R2 CURRENT (( GOOD PFI GND GOOD Figure 5. Adding Hysteresis to Power-Fail for Push-Pull PFO Monitoring an Additional Power Supply These µ ...

Page 13

... Dual/Triple Ultra-Low-Voltage SOT23 µ REF RSTIN/PFI V REF V REF/2 ______________________________________________________________________________________ Supervisory Circuits Functional Diagram PULLUP RESET RESET TIMEOUT OUTPUT PERIOD DRIVER WATCHDOG TIMER RST RST PFO WDI 13 ...

Page 14

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits NUMBER OF OPEN- PART VOLTAGE DRAIN NUMBER RESET MONITORS MAX6715 2 MAX6716 2 MAX6717 2 MAX6718 2 MAX6719 3 MAX6720 3 MAX6721 2 MAX6722 2 MAX6723 3 MAX6724 3 MAX6725 3 MAX6726 3 MAX6727 3 MAX6728 3 MAX6729 3 Ordering Information (continued) PART TEMP RANGE MAX6721UT_ _D_ -T -40°C to +85°C MAX6722UT_ _D_ -T -40° ...

Page 15

... Standard versions require 2,500 piece order increments and are typically held in sample stock. There is a 10,000 order increment on nonstandard versions. Other thresh- old voltages may be available, contact factory for availability. ______________________________________________________________________________________ Supervisory Circuits Table 2. Reset Timeout Period Suffix Guide V 2 NOMINAL ...

Page 16

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits TOP VIEW RST1 1 6 MAX6715/ GND 2 5 MAX6716 SOT23 RST 1 6 MAX6721/ GND 2 5 MAX6722 SOT23 RST 1 GND 2 WDI 3 RST 4 16 ______________________________________________________________________________________ V 1 RST MAX6717/ RST2 GND 2 MAX6718 ...

Page 17

... Dual/Triple Ultra-Low-Voltage SOT23 µP (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Supervisory Circuits Package Information PACKAGE OUTLINE, SOT-23, 5L 21-0057 ...

Page 18

... Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 18 ______________________________________________________________________________________ Package Information (continued) PACKAGE OUTLINE, SOT 6L BODY 21-0058 ...

Page 19

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2005 Maxim Integrated Products ...

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