MAX706SCUA Maxim Integrated, MAX706SCUA Datasheet

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MAX706SCUA

Manufacturer Part Number
MAX706SCUA
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
MAX706AP, MAX706AR, MAX706AS, MAX706AT, MAX706P, MAX706R, MAX706S, MAX706T, MAX708R, MAX708S, MAX708Tr
Datasheet

Specifications of MAX706SCUA

Number Of Voltages Monitored
1
Monitored Voltage
2.93 V
Undervoltage Threshold
2.85 V
Overvoltage Threshold
3 V
Output Type
Active Low, Push-Pull
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
200 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
Package / Case
uSOP
Chip Enable Signals
No
Maximum Power Dissipation
362 mW
Minimum Operating Temperature
0 C
Power Fail Detection
Yes
Supply Current (typ)
350 uA
Supply Voltage - Min
1 V

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The MAX706P/R/S/T, MAX706AP/AR/AS/AT, and
MAX708R/S/T microprocessor (µP) supervisory circuits
reduce the complexity and number of components
required to monitor +3V power-supply levels in +3V to
+5V µP systems. These devices significantly improve
system reliability and accuracy compared to separate
ICs or discrete components.
The MAX706P/R/S/T and MAX706AP/AR/AS/AT supervi-
sory circuits provide the following four functions:
1) A reset output during power-up, power-down, and
2) An independent watchdog output that goes low if the
3) A 1.25V threshold detector for power-fail warning,
4) An active-low, manual-reset input.
The only difference between the MAX706R/AR,
MAX706S/AS, and MAX706T/AT is the reset-threshold
voltage levels, which are 2.63V, 2.93V, and 3.08V,
respectively. All have active-low reset output signals.
The MAX706P/AP are identical to the MAX706R/AR,
except the reset output signal is active-high. The watch-
dog timer function for the MAX706AP/AR/AS/AT dis-
ables when the WDI input is left open or connected to a
high-impedance state of a low-leakage tri-state output.
The MAX708R/S/T provide the same functions as the
MAX706R/S/T and MAX706AR/AS/AT except they do
not have a watchdog timer. Instead, they provide both
RESET and RESET outputs. As with the MAX706,
devices with R, S, and T suffixes have reset thresholds
of 2.63V, 2.93V, and 3.08V, respectively.
These devices are available in 8-pin SO, DIP, and
µMAX
ating temperature range.
19-0099; Rev 5; 4/06
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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.
brownout conditions.
watchdog input has not been toggled within 1.6s.
low-battery detection, or for monitoring a power
supply other than the main supply.
®
Battery-Powered Equipment
Portable Instruments
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
packages and are fully specified over the oper-
________________________________________________________________ Maxim Integrated Products
General Description
+3V Voltage Monitoring, Low-Cost µP
Applications
o µMAX Package, Small 8-Pin SO
o Precision Supply-Voltage Monitors
o 200ms Reset Time Delay
o Debounced TTL/CMOS-Compatible Manual Reset
o 100µA Quiescent Current
o WDI Disable Feature (MAX706AP/AR/AS/AT)
o Watchdog Timer: 1.6s Timeout
o Reset Output Signal:
o Voltage Monitor for Power-Fail or Low-Battery
o 8-Pin Surface-Mount Package
o Guaranteed RESET Assertion to V
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
MAX706PCPA
MAX706PCUA
SO, µMAX, and PDIP packages are available in lead-free.
MAX706PCSA
MAX706PEPA
Input
Warning
Typical Operating Circuits continued at end of data sheet.
UNREGULATED
2.63V (MAX706P/R, MAX706AP/AR, and MAX708R)
2.93V (MAX706S, MAX706AS, and MAX708S)
3.08V (MAX706T, MAX706AT, and MAX708T)
Active-High Only (MAX706P, MAX706AP)
Active-Low Only (MAX706R/S/T, MAX706AR/AS/AT)
Active-High and Active-Low (MAX708R/S/T)
PART†
Supervisory Circuits
DC
PUSHBUTTON
SWITCH
Typical Operating Circuits
MAX639
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
RANGE
TEMP
Ordering Information
V
PFI
MR
CC
DC-DC
CONVERTER
+3V/+3.3V
MAX706AR/AS/AT
MAX706R/S/T
GND
RESET
PIN-
PACKAGE
8 PDIP
8 SO
8 µMAX
8 PDIP
WDO
WDI
PFO
CC
Features
= 1V
V
RESET
I/O LINE
NMI
INTERRUPT
CC
µP
CODE
PKG
P8-1
S8-2
U8-1
P8-1
1

Related parts for MAX706SCUA

MAX706SCUA Summary of contents

Page 1

... Portable Instruments Computers Controllers Intelligent Instruments Critical µP Power Monitoring µMAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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 o µ ...

Page 2

... Voltage Monitoring, Low-Cost µP Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V ........................................................................-0.3V to +6V CC All Other Inputs (Note 1)..........................-0. Input Current V ..................................................................................20mA CC GND .................................................................................20mA Output Current (all outputs) ................................................20mA Continuous Power Dissipation (T = +70°C) A 8-Pin CERDIP (derate 8mW/°C above +70°C)..............640mW 8-Pin PDIP (derate 9.1mW/° ...

Page 3

... MAX PARAMETER SYMBOL Output-Voltage High (MAX706P) (MAX706AP) Output-Voltage High (MAX708_) WATCHDOG INPUT Watchdog Timeout Period WDI Pulse Width (MAX706_, MAX706A_) Watchdog Input Threshold (MAX706_, MAX706A_) WDI Input Current _______________________________________________________________________________________ Supervisory Circuits = 3.0V to 5.5V; MAX70_T, MAX706AT CONDITIONS V V < V < 3. RST(MAX) CC SOURCE V V < ...

Page 4

... Voltage Monitoring, Low-Cost µP Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued) (MAX70_P/R, MAX706AP/AR 2.7V to 5.5V; MAX70_S, MAX706AS 5.5V unless otherwise noted. Typical values are MIN MAX PARAMETER SYMBOL WATCHDOG OUTPUT WDO Output Voltage (MAX706_, MAX706A_) MANUAL RESET INPUT MR Pullup Current ...

Page 5

... Voltage Monitoring, Low-Cost µ +25°C, unless otherwise noted.) A _______________________________________________________________________________________ Supervisory Circuits Typical Operating Characteristics Typical Operating Characteristics 5 ...

Page 6

... Voltage Monitoring, Low-Cost µP Supervisory Circuits MAX706P MAX706R/S/T, MAX706AP MAX706AR/AS/AT SO/DIP µMAX SO/DIP µMAX — — — — — — — — 6 _______________________________________________________________________________________ NAME MAX708R/S/T SO/DIP µ ...

Page 7

... RESET and RESET outputs to remain asserted. Thus, a brownout condition that interrupts a previously initiated reset pulse causes an additional 200ms delay from the time the latest interruption occurred. On power-down once V drops below the reset threshold, CC _______________________________________________________________________________________ Supervisory Circuits 8 WDO ...

Page 8

... Voltage Monitoring, Low-Cost µP Supervisory Circuits +3. RST RST CC +1V t RST RESET 0V +3.3V RESET 0V +3.3V MR* 0V +3.3V *NOTE: MR EXTERNALLY DRIVEN LOW. WDO* WDO TIMING SHOWN FOR MAX706P/R/S/T. 0V Figure 3. RESET, RESET, MR, and WDO Timing +3V/+3.3V WDI 0V +3V/+3.3V WDO 0V +3V/+3.3V RESET 0V RESET EXTERNALLY TRIGGERED BY MR Figure 4 ...

Page 9

... Hysteresis adds a noise margin to the power-fail com- parator and prevents repeated triggering of the PFO when V is near the power-fail comparator trip point. IN Figure 7 shows how to add hysteresis to the power-fail comparator. Select the ratio of R1 and R2 such that PFI _______________________________________________________________________________________ Supervisory Circuits reset CC +3V/+3.3V ...

Page 10

... MAX706RMJA -55°C to +125°C 8 CERDIP* MAX706SCPA 0°C to +70°C 8 Plastic Dip MAX706SCSA 0°C to +70° MAX706SCUA 0°C to +70°C 8 µMAX MAX706SEPA -40°C to +85°C 8 Plastic Dip MAX706SESA -40°C to +85° MAX706SEUA -40°C to +85°C 8 µ ...

Page 11

... AS/ µMAX RESET 1 8 RESET 2 7 MAX708R/S µMAX ( ) ARE FOR MAX706P/AP ONLY. ______________________________________________________________________________________ Supervisory Circuits WDO UNREGULATED DC RESET WDI PFO WDO PUSHBUTTON RESET WDI PFO RESET RESET N.C. PFO WDI PFO PFI GND N.C. PFO PFI GND Typical Operating Circuits ...

Page 12

... Voltage Monitoring, Low-Cost 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.) 12 ______________________________________________________________________________________ Package Information ...

Page 13

... Voltage Monitoring, Low-Cost 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 (continued) α α 13 ...

Page 14

... Voltage Monitoring, Low-Cost 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.) 14 ______________________________________________________________________________________ Package Information (continued) ...

Page 15

... 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 ____________________ 15 © 2006 Maxim Integrated Products ...

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