DS1831AS+ Maxim Integrated Products, DS1831AS+ Datasheet - Page 2

• Manufacturer Part Number: DS1831AS+
• Description: IC MULTIMON 5V/3.3V WDOG 16-SOIC
• Manufacturer: Maxim Integrated Products
• Series: MicroMonitor™r
• Type: Multi-Voltage Supervisorr

Specifications of DS1831AS+

• Number Of Voltages Monitored: 3
• 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
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Monitored Voltage: 3 V or 3.3 V or 5 V
• Undervoltage Threshold: 4.5 V or 2.98 V
• Overvoltage Threshold: 4.75 V or 3.15 V
• Manual Reset: Resettable
• Watchdog: Yes
• Battery Backup Switching: No
• Power-up Reset Delay (typ): 2000 ms
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Supply Current (typ): 100 uA
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Output Type: Active Low or Open Drain
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3V reset or for all reset outputs by the master pushbutton. The DS1831A replaces one reference
comparator and the master pushbutton with watchdog and the DS1831B replaces the 3.3V
last reset status output.
TOL and TD inputs allow user configuration of the DS1831 for multiple applications. The TOL inputs
configure the tolerance for the specified output and the TD inputs configure the reset time delays.
PIN DESCRIPTION
DS1831 BLOCK DIAGRAM Figure 1
IN
TOL
TD
IN1
IN2
ST
GND
RST
PBRST
PBRST
GROUND
5V
MPBRST
PBRST
5V
TOL
5V
TOL
5V
TD
IN
TD
IN
IN1
IN2
5V
3.3V
3.3V
3.3V
3.3V
5V
5V
5V
5V
100k
5V Power Supply Input
5V Reset Open Drain Output
Selects 5V Input Tolerance
Selects 5V Reset Time Delay
5V Reset Pushbutton
Sense Input 1
Sense Input 2 (DS1831)
Watchdog Strobe Inputs
(DS1831A)
Ground
100k
100k
TOLERANCE
TOLERANCE
REFERENCE
1.25V T.C.
+
-
BIAS
BIAS
V
V
CC
CC
+
-
+
-
+
-
Sense
Level
&
2 of 14
PBRST
MPBRST
TOL
RST
TD
TD
NMI2
NMI1
PBST
IN
WDS
DELAY
TIME
DELAY
3.3V
3.3V
TIME
WD
3.3V
3.3V
3.3V
Master Pushbutton (DS1831)
Watchdog Time Delay Select (DS1831A)
Non-maskable Interrupt 2 (DS1831)
Watchdog Status Output (DS1831A)
Non-maskable Interrupt 1
3.3V Reset Pushbutton
Pushbutton Status Output (DS1831B)
Select 3.3V Reset Time Delay
Selects 3.3V Input Tolerance
3.3V Reset Open Drain Output
3.3V Power Supply Input
RST
RST
NMI1
NMI2
5V
3.3V
PBRST
DS1831/A/B
with a