DS1831BS+ Maxim Integrated Products, DS1831BS+ Datasheet - Page 10

IC MULTIMN 5/3.3V WDOG PB 16SOIC

DS1831BS+

Manufacturer Part Number
DS1831BS+
Description
IC MULTIMN 5/3.3V WDOG PB 16SOIC
Manufacturer
Maxim Integrated Products
Series
MicroMonitor™r
Type
Multi-Voltage Supervisorr
Datasheet

Specifications of DS1831BS+

Number Of Voltages Monitored
4
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
10 ms; 100 ms; 1,000 ms Minimum
Voltage - Threshold
3.3V, 5V, Adj, Adj
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Monitored Voltage
3 V, 3.3 V, 5 V
Undervoltage Threshold
4.5 V, 2.98 V
Overvoltage Threshold
3.15 V, 4.75 V
Output Type
Active Low, Open Drain
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
2000 ms
Supply Voltage (max)
5.5 V
Supply Voltage (min)
1 V
Supply Current (typ)
100 uA
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Power Fail Detection
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The
microprocessor address signals, data signals, or control signals. When the microprocessor functions
normally, these signals would, as a matter of routine, cause the watchdog to be reset prior to time-out. To
guarantee that the watchdog timer does not time-out, a transition must occur at or less than the minimum
times shown in Table 1. A typical circuit example is shown in Figure 10. The watchdog timing is shown
in Figure 11.
The DS1831A watchdog function cannot be disabled. The watchdog strobe input must be strobed to avoid
a watchdog time-out however the watchdog status output can be disconnected yielding the same result.
WATCHDOG CIRCUIT EXAMPLE Figure 10
TIMING DIAGRAM — STROBE INPUT Figure 11
ST
input can be derived from many microprocessor outputs. The most typical signals used are the
ST
WDS
µP
V
SENSE1
INVALID
EDGES
t
R1
R2
ST
PBRST
GND
IN1
ST
5V
EDGES
VALID
DS1831
10 of 14
NMI1
WDS
TD
PBRST
t
TD
WD
3.3V
MIN
V
CC
10kW
INDETERMINATE
EDGES
MAX

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