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DS1831A Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer DS1831A
Beschreibung Multisupply Micromonitor
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 14 Seiten
DS1831A Datasheet, Funktion
www.DataSheet4U.com
www.maxim-ic.com
FEATURES
§ 5V power-on reset
§ 3.3V power-on reset
§ Two referenced comparators with separate
outputs for monitoring additional supplies
§ Internal power is drawn from higher of either
the IN5V input or the IN3.3V input
§ Excellent for systems designed to operate
with multiple power supplies
§ Asserts resets during power transients
§ Pushbutton reset input for system override
§ Maintains reset for user configurable times
of 10ms, 100ms, or 1s
§ Watchdog timer for software monitoring
(DS1831A)
§ Precision temperature-compensated voltage
reference and voltage sensor
§ 16 pin DIP and 16 pin 150mil SO available
§ Operating Temperature of -40°C to +85°C
DS1831A
DS1831/A/B
Multisupply Micromonitor
PIN ASSIGNMENT
DS1831
IN5V
RST5V
TOL5V
TD5V
PBRST5V
IN1
1
2
3
4
5
6
16 IN3.3V
15 RST3.3V
14 TOL3.3V
13 TD3.3V
12 PBRST3.3V
11 NMI1
IN2 7
10 NMI2
GND 8
9 MPBRST
16-Pin (300mil) DIP
&
16-Pin (150mil) SO
DS1831B
IN5V
RST5V
TOL5V
TD5V
PBRST5V
IN1
1
2
3
4
5
6
16 IN3.3V
15 RST3.3V
14 TOL3.3V
13 TD3.3V
12 PBRST3.3V
11 NMI1
ST 7
10 WDS
GND 8
9 TDWD
16-Pin (300mil) DIP
&
16-Pin (150mil) SO
IN5V
RST5V
TOL5V
TD5V
PBRST5V
IN1
1
2
3
4
5
6
16 IN3.3V
15 RST3.3V
14 TOL3.3V
13 TD3.3V
12 PBST
11 NMI1
IN2 7
10 NMI2
GND 8
9 MPBRST
16-Pin (300mil) DIP
&
16-Pin (150mil) SO
DESCRIPTION
The DS1831 multisupply monitor and reset monitors up to four system voltages: 5V supply, 3.3V (or 3V)
supply, and two additional user configurable voltage monitors. DS1831 power for internal operation
comes from the higher voltage level of the 3.3V input or the 5V input. One of these inputs must be greater
than 1V for device operation. Pushbutton (manual reset) functionality is provided for the 5V reset, the
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060303






DS1831A Datasheet, Funktion
TIMING DIAGRAM—5V OR 3.3V PUSHBUTTON RESET Figure 5
www.DataSheet4U.com
PBRST5V
(or PBRST3.3V)
tPDLY
VIL
tPB
VIH
RST5V (or RST3.3V)
tRST
VOH
VIL
DS1831/A/B
OPERATION—PUSHBUTTON STATUS
The DS1831B provides a master pushbutton status open drain output. The PBST output indicates the
status of the most recent reset condition. If the last reset was generated by the master pushbutton input it
would maintain a low condition until cleared by another event (except the master pushbutton) generating
a reset. Once cleared it will remain high until the master pushbutton is pulled low generating a reset
condition. The PBST output is open drain and will require a pull-up resistor on the output to maintain a
valid condition. The value of the pull up resistor is not critical in most cases but must be set low enough
to pull the output to a high state. A common value used is 10kW (see Figure 6).
DS1831B APPLICATION EXAMPLE Figure 6
5V Supply
3.3V Supply
VCC
VSENSE2
VSENSE1
IN5V
RST5V
TOL5V
TD5V
PBRST5V
IN1
IN2
GND
1 16
2 15
3 14
4 13
DS1831B
5 12
6 11
7 10
89
IN3.3V
RST3.3V
TOL3.3V
TD3.3V
PBST
NMI1
NMI2
MPBRST
VCC
10 kW
10kW
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6 Page









DS1831A pdf, datenblatt
DS1831/A/B
ABSOLUTE MAXIMUM RATINGS*
Voltage on IN5V or IN3.3V
wPwiwn.Ds aRtaeSlhaeteitv4eU.ctoomGround
-0.5V to +6.0V
Voltage on either RST Relative to Ground
Voltage on PBRST 3.3V Relative to Ground
Voltage on PBRST 5V Relative to Ground
Voltage on MPBRST, IN1, IN2
Relative to Ground
Operating Temperature Range
-0.5V to the greater of IN5V + 0.5V or IN3.3V + 0.5V
-0.5V to IN3.3V + 0.5V
-0.5V to IN5V + 0.5V
-0.5V to the greater of IN5V + 0.5V or IN3.3V + 0.5V
-40°C to +85°C
Storage Temperature Range
-55°C to +125°C
Soldering Temperature
See IPC/JEDEC J-STD-020A specification
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
PARAMETER
IN5V (Supply Voltage)
IN3.3V (Supply Voltage)
PBRST 3.3V, PBRST 5V, MPBRST , ST
input High Level
SYMBOL
V IN
V IN
VIH
MIN
1.0
1.0
0.7 x VINT
PBRST 3.3V, PBRST 5V, MPBRST , ST
input Low Level
VIL
* VINT is the greater voltage level of the IN5V or IN3.3V.
-0.3
MAX
5.5
5.5
VINT + 0.3
0.3 x VINT
(-40°C to 85°C)
UNITS NOTES
V1
V1
V 1*
V 1*
DC ELECTRICAL CHARACTERISTICS
(-40°C to 85°C; IN3.3V, IN5V = 1.0V to 5.5V)
PARAMETER
SYMBOL MIN
TYP MAX UNITS NOTES
Input Leakage
IIL -1.0
+1.0 µA
2
Output Current @ 2.4V
IOH
3
Output Current @ 0.4V
IOL +10
mA 4
Operating Current @ Ü5.5V
ICC
80 100 µA
5
Operating Current @ Ü3.6V
ICC
60 85 µA 6
IN5V Trip Point (TOL5V = IN5V)
VINTP
4.50
4.63 4.75
V
IN5V Trip Point (TOL5V = GND)
VINTP
4.25
4.38 4.49
V
IN5V Trip Point (TOL5V = Float)
VINTP
4.00
4.15 4.24
V
IN3.3V Trip Point (TOL3.3V = IN3.3V)
VINTP
2.98
3.06 3.15
V
IN3.3V Trip Point (TOL3.3V = GND)
VINTP
2.80
2.88 2.97
V
IN3.3V Trip Point (TOL3.3V = Float)
VINTP
2.47
2.55 2.64
V
IN Input Trip Points
VTP 1.15 1.25 1.30 V
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