DS1708R Maxim Integrated Products, DS1708R Datasheet

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DS1708R

Manufacturer Part Number
DS1708R
Description
Manufacturer
Maxim Integrated Products
Datasheet

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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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DS1708R 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

... Trip Point DS1707 CC V Trip Point DS1708 CC V Trip Point DS1708T CC V Trip Point DS1708S CC V Trip Point DS1708R CC Input Leakage Output Current @ 2.4V Output Current @ 0.4V Output Voltage @ -500µA Operating Current @ V < 5.5V CC Operating Current @ V < 3. Input Trip Point ...

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

... DIP (300mil) DS1708ESA 8-pin SOIC (150 mil) DS1708EUA 8-pin µSOP (118 mil) DS1708REPA 8-pin DIP (300mil) DS1708RESA 8-pin SOIC (150 mil) DS1708REUA 8-pin µSOP (118 mil) DS1708SEPA 8-pin DIP (300mil) DS1708SESA 8-pin SOIC (150 mil) DS1708SEUA 8-pin µSOP (118 mil) DS1708TEPA ...

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