DS1834DU/T&R Maxim Integrated, DS1834DU/T&R Datasheet

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DS1834DU/T&R

Manufacturer Part Number
DS1834DU/T&R
Description
Supervisory Circuits
Manufacturer
Maxim Integrated
Series
DS1834, DS1834A, DS1834Dr
Datasheet

Specifications of DS1834DU/T&R

Number Of Voltages Monitored
2
Monitored Voltage
3.3 V, 5 V
Undervoltage Threshold
4.5 V, 2.8 V
Overvoltage Threshold
4.75 V, 2.97 V
Output Type
Active High
Manual Reset
Not Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
500 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
uSOP
Chip Enable Signals
No
Minimum Operating Temperature
- 40 C
Power Fail Detection
Yes
Supply Current (typ)
50 uA
Supply Voltage - Min
1.2 V
Part # Aliases
90-1834D-UT0
FEATURES
DESCRIPTION
The DS1834 Dual EconoResets monitors three vital system conditions: 5-volt supply, 3.3-volt supply,
and an external override. First a precision temperature reference and comparator circuit monitor the status
of the 5-volt supply and the 3.3-volt supply. When an out-of-tolerance condition is detected, an internal
power-fail signal is generated which forces the reset of the affected supply to an active state.
Lastly, the DS1834 supports an external reset via an internally debounced pushbutton input. When the
pushbutton is pulled low both resets will be asserted for approximately 350 ms after the pushbutton is
released.
www.dalsemi.com
5V power-on reset
3.3V power-on reset
Internal power is drawn from higher of either
the 5V
Excellent for systems designed to operate
with dual power supplies
Asserts resets during power transients
Pushbutton reset input for system override
Maintains reset for 350 ms after V
to an in-tolerance condition
Reduces need for discrete components
Precision temperature-compensated voltage
reference and voltage sensor
8-pin DIP, 8-pin SOIC, and 8-pin -SOP
available
CMOS output for low current operation on
the DS1834 and DS1834D
Operating temperature of -40 C to +85 C
IN
input or the 3.3V
IN
input
CC
returns
Dual EconoReset with Pushbutton
1 of 7
PIN ASSIGNMENT
PIN DESCRIPTION
5V
5V
5V TOL
GND
3.3V TOL
3.3V
3.3V
*DS1834D Active High Reset
PBRST
IN
RST
IN
RST
5V RST (*RST)
(*RST)
5V RST
5V RST
5V TOL
5V TOL
(*RST) - 3.3V Reset Output
GND
GND
5V
5V
DS1834 8-Pin -SOP (118-mil)
DS1834 8-Pin SOIC (150-mil)
5V TOL
DS1834 8-Pin DIP (300-mil)
IN
IN
GND
5V
IN
- 5V Power Supply Input
- 5V Reset Output
- Selects 5V Input Tolerance
- Ground
- Pushbutton Reset
- Selects 3.3V Input Tolerance
- 3.3V Power Supply Input
1
2
3
4
1
2
3
4
1
2
3
4
8
7
6
5
8
7
6
5
8
7
6
5
3.3V
3.3V RST (*RST)
3.3V TOL
PBRST
DS1834/A/D
3.3V
3.3V RST
3.3V TOL
PBRST
3.3V
3.3V RST
3.3V TOL
PBRST
IN
IN
IN
071700

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DS1834DU/T&R Summary of contents

Page 1

FEATURES 5V power-on reset 3.3V power-on reset Internal power is drawn from higher of either the 5V input or the 3. Excellent for systems designed to operate with dual power supplies Asserts resets during power transients Pushbutton ...

Page 2

OPERATION Power Monitor The DS1834 provides the functions of detecting out-of-tolerance conditions on a 3.3-volt and 5-volt power supply and warning a processor-based system of impending power failure. When an input is detected as out of tolerance on either voltage ...

Page 3

Tolerance Select The DS1834 provides two TOL inputs for individual customization of the DS1834 to specific application requirements. If the TOL for the 5-volt supply is tied to the 5-volt input a 10% tolerance is selected for the 5 volt ...

Page 4

OUTPUT VALID CONDITIONS All versions of the DS1834 can maintain valid outputs as long as one input remains above 1.2 volts. However, the outputs on the DS1834 use a push-pull output structure which can maintain a valid RST output below ...

Page 5

TIMING DIAGRAM: POWER-DOWN Figure 8 TIMING DIAGRAM: POWER-UP Figure DS1834/A/D ...

Page 6

ABSOLUTE MAXIMUM RATINGS* Voltage on V Pin Relative to Ground IN Voltage on RST (5V) Pin Relative to Ground Voltage on RST (3.3V) Pin Relative to Ground Voltage on & RST (DS1834A) Pin PBRST Relative to Ground Operating Temperature Storage ...

Page 7

AC ELECTRICAL CHARACTERISTICS PARAMETER = V PBRST IL Stable Low to Reset PBRST Active Reset Active Time V Detect to (or RST) RST CC V Slew Rate ( INTP(MAX INTP(MIN) V Slew Rate ( ...

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