DS1705

3.3V and 5.0V MicroMonitor


Please check latest availability status for a specific part variant.

Description

The DS1705/DS1706 3.3- or 5.0-Volt MicroMonitor monitors three vital conditions for a microprocessor: power supply, software execution, and external override. A precision temperature compensated reference and comparator circuit monitor the status of VCC at the device and at an upstream point for maximum protection. When the sense input detects an out-of-tolerance condition a non-maskable interrupt is generated. As the voltage at the device degrades, an internal power fail signal is generated which forces the reset to an active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 130ms to allow the power supply and processor to stabilize.

The second function the DS1705/DS1706 performs is pushbutton reset control. The DS1705/DS1706 debounces the pushbutton input and guarantees an active reset pulse width of 130ms minimum.

The third function is a watchdog timer. The DS1705/DS1706 has an internal timer that forces the WDO signal to the active state if the strobe input is not driven low prior to time-out.
DS1705, DS1706: Block Diagram DS1705, DS1706: Block Diagram Enlarge+

Key Features

  • Halts and restarts an out-of-control microprocessor
  • Holds microprocessor in check during power transients
  • Automatically restarts microprocessor after power failure
  • Monitors pushbutton for external override
  • Accurate 5%, 10% or 20% resets for 3.3V systems and 5% or 10% resets for 5.0V systems
  • Eliminates the need for discrete components
  • 3.3V 20% tolerance for use with 3.0V systems
  • Pin-compatible with the MAXIM MAX705/MAX706 in 8-pin DIP, 8-pin SO, and µSOP
  • 8-pin DIP, 8-pin SO and 8-pin µSOP packages
  • Industrial temperature range -40°C to +85°C
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
DS1705 3.3 to 5.5
Active Low
Push-Pull
85ms to 300msInput/Output (WDI/WDO)1s to 2s
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
2.560
PDIP/8
SOIC (N)/8
UMAX/8
$3.28 @1k
DS1706 3.3 to 5.5
Active Low
Push-Pull
60
PDIP/8
SOIC (N)/8
UMAX/8
$1.77 @1k
DS1706L 3.3 to 5.5
Active High
Push-Pull
60
SOIC(N)/8
$1.77 @1k
DS1706P 2.5 to 3.3
Active High
Push-Pull
50
SOIC(N)/8
$3.90 @1k
DS1706R 2.5 to 3.3
Active Low
Push-Pull
50
SOIC(N)/8
$3.90 @1k
DS1706S 2.5 to 3.3
Active Low
Push-Pull
50
SOIC(N)/8
$3.89 @1k
DS1706T 2.5 to 3.3
Active Low
Push-Pull
50
SOIC(N)/8
$4.12 @1k
See All Supervisors (1 Monitored Voltage) (261)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

CAD Symbols and Footprints

  • DS1705EPA
  • DS1705EPA+
  • DS1705ESA
  • DS1705ESA+
  • DS1705ESA+T&R
  • DS1705ESA/T&R
  • DS1705EUA
  • DS1705EUA+
  • DS1705EUA+T&R
  • DS1705EUA/T&R
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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