DS1708REUA+ Maxim Integrated, DS1708REUA+ Datasheet

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DS1708REUA+

Manufacturer Part Number
DS1708REUA+
Description
Supervisory Circuits 3.3/5V MicroMonitor
Manufacturer
Maxim Integrated
Series
DS1707, DS1708r
Datasheet

Specifications of DS1708REUA+

Rohs
yes
Number Of Voltages Monitored
1
Monitored Voltage
3.3 V, 5 V
Undervoltage Threshold
2.55 V
Overvoltage Threshold
2.7 V
Output Type
Active High, Active Low, Push-Pull
Manual Reset
Not Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
285 ms
Supply Voltage - Max
5.5 V
Maximum Operating Temperature
+ 85 C
Package / Case
uMAX
Chip Enable Signals
No
Minimum Operating Temperature
- 40 C
Power Fail Detection
Yes
Supply Current (typ)
60 uA
Supply Voltage - Min
1.2 V
Part # Aliases
90-1708R+U00
FEATURES
§ Holds microprocessor in check during power
§ Automatically restarts microprocessor after
§ Monitors pushbutton for external override
§ Accurate 5%, 10% or 20% resets for 3.3V
§ Eliminates the need for discrete components
§ 20% tolerance compatible with 3.0V systems
§ Pin compatible with the MAXIM
§ 8-pin DIP, 8-pin and m-SOP SOIC and 8-pin
§ Industrial temperature range -40°C to +85°C
DESCRIPTION
The DS1707/DS1708 3.3- or 5.0-Volt MicroMonitor monitors three vital conditions for a microprocessor:
power supply, voltage sense, and external override. A precision temperature-compensated reference and
comparator circuit monitor the status of V
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 V
active state for a minimum of 130 ms to allow the power supply and processor to stabilize.
www.maxim-ic.com
transients
power failure
systems and 5% or 10% resets for 5.0V
systems
MAX707/MAX708 in 8-pin DIP, 8-pin SOIC
packages
m-SOP packages available
CC
returns to an in-tolerance condition, the reset signal is kept in the
CC
at the device and at an upstream point for maximum
1 of 10
PIN ASSIGNMENT
PIN DESCRIPTION
V
GND
IN
NC
RST
PBRST
RST
NMI
CC
3.3 and 5.0-Volt MicroMonitor
PBRST
PBRST
DS1707 and DS1708_R/S/T
See Mech. Drawings Section on website
GND
GND
V
V
PBRST
IN
IN
CC
CC
- Pushbutton Reset Input
- Power Supply
- Ground
- Input
- Non-maskable Interrupt
- No Connect
- Active Low Reset Output
- Active High Reset Output
RST
RST
8-Pin m-SOP (118-mil)
8-Pin SOIC (150-mil)
V
8-Pin DIP (300-mil)
CC
1
2
3
4
1
2
3
4
1
2
3
4
DS1707/DS1708
8
7
6
5
8
7
6
5
8
7
6
5
NC
NMI
IN
GND
RST
RST
NC
NMI
RST
RST
NC
NMI
041305

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DS1708REUA+ Summary of contents

Page 1

FEATURES § 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 ...

Page 2

The third function the DS1707/DS1708 performs is pushbutton reset control. The DS1707/DS1708 debounces the pushbutton input and guarantees an active reset pulse width of 130 ms minimum. OPERATION Power Monitor The DS1707/DS1708 detects out-of-tolerance power supply conditions and warns a ...

Page 3

MICROMONITOR BLOCK DIAGRAM Figure 1 40kW PUSHBUTTON RESET Figure 2 PUSHBUTTON RESET CONTROLLED BY Figure 3 NMI ...

Page 4

TIMING DIAGRAM: PUSHBUTTON RESET Figure 4 NON-MASKABLE INTERRUPT CIRCUIT EXAMPLE Figure 5 V SENSE Example: Therefore 4.50V at the trip point SENSE kΩ ...

Page 5

TIMING DIAGRAM: NON-MASKABLE INTERRUPT Figure 6 TIMING DIAGRAM: POWER-DOWN Figure ...

Page 6

TIMING DIAGRAM: POWER UP Figure ...

Page 7

ABSOLUTE MAXIMUM RATINGS* Voltage on V Pin Relative to Ground CC Voltage on I/O Relative to Ground** Operating Temperature Storage Temperature Soldering Temperature * This is a stress rating only and functional operation of the device at these or any ...

Page 8

AC ELECTRICAL CHARACTERISTICS PARAMETER = V PBRST IL Reset Active Time V Detect to RST and RST CC V Slew Rate CC V Detect to RST and RST CC V Slew Rate CC Stable Low to RST and PBRST VIN ...

Page 9

PART MARKING CODES 8-pin DIP (300 MIL) 8-pin SOIC (150 MIL) 8-pin µSOP (118 MIL) Code Description AB Device type and tolerance yww or yyww Date Code. Identifies the year and work week the device was assembled. rv Die Revision ...

Page 10

ORDERING INFORMATION ORDERING PACKAGE NUMBER DS1707EPA 8-pin DIP (300mil) DS1707ESA 8-pin SOIC (150 mil) DS1707EUA 8-pin µSOP (118 mil) DS1708EPA 8-pin DIP (300mil) DS1708ESA 8-pin SOIC (150 mil) DS1708EUA 8-pin µSOP (118 mil) DS1708REPA 8-pin DIP (300mil) DS1708RESA 8-pin SOIC ...

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