DS1708T Dallas Semiconductor, DS1708T Datasheet

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DS1708T

Manufacturer Part Number
DS1708T
Description
3.3 volt micromonitor, tolerance 5%
Manufacturer
Dallas Semiconductor
Datasheet

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FEATURES
DESCRIPTION
The DS1707/DS1708 3.3 or 5.0 Volt MicroMonitor moni-
tors three vital conditions for a microprocessor: power
supply, voltage sense, and external override. A preci-
sion
comparator circuit monitors the status of V
device and at an upstream point for maximum protec-
tion. When the sense input detects an out–of–tolerance
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
Holds microprocessor in check during power tran-
sients
Automatically restarts microprocessor after power
failure
Monitors pushbutton for external override
Accurate 5%, 10% or 20% resets for 3.3 systems and
5% or 10% resets for 5.0 volt systems
Eliminates the need for discrete components
20% tolerance compatible with 3.0 volt systems
Pin compatible with the MAXIM MAX707/MAX708 in
8–pin DIP and 8–pin SOIC packages
8–pin DIP, 8–pin SOIC and 8–pin –SOP packages
available
Industrial temperature range –40 C to +85 C
Copyright 1995 by Dallas Semiconductor Corporation.
temperature–compensated
reference
CC
at the
and
PIN ASSIGNMENT
PIN DESCRIPTION
PBRST
V
GND
IN
NMI
NC
RST
RST
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
the reset signal is kept in the active state for a minimum
of 130 ms to allow the power supply and processor to
stabilize.
3.3 and 5.0 Volt MicroMonitor
CC
PBRST
PBRST
GND
GND
V
V
DS1707 and DS1708_/R/S/T
PBRST
CC
CC
IN
IN
CC
GND
V
– Pushbutton Reset Input
– Power Supply
– Ground
– Input
– Non–maskable Interrupt
– No Connect
– Active Low Reset Output
– Active High Reset Output
CC
See Mech. Drawings
IN
returns to an in–tolerance condition,
8–PIN SOIC
8–PIN –SOP
1
2
3
4
8–PIN DIP
(300 MIL)
(150 MIL)
1
2
3
4
1
2
3
4
(118 MIL)
Section
DS1707/DS1708
8
7
6
5
8
7
6
5
8
7
6
5
RST
RST
NC
NMI
RST
RST
NC
NMI
RST
RST
NC
NMI
DS1707/DS1708
010996 1/9

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DS1708T Summary of contents

Page 1

... V device and at an upstream point for maximum protec- tion. When the sense input detects an out–of–tolerance Copyright 1995 by Dallas Semiconductor Corporation. All Rights Reserved. For important information regarding patents and other intellectual property rights, please refer to Dallas Semiconductor data books ...

Page 2

DS1707/DS1708 The third function the DS1707/DS1708 performs is pushbutton reset control. 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 processor–based ...

Page 3

MICROMONITOR BLOCK DIAGRAM Figure 1 IN – + T.C. REFERENCE – PBRST PUSHBUTTON RESET Figure 2 5V UPSTREAM SUPPLY VOLTAGE PUSHBUTTON RESET CONTROLLED BY NMI Figure 3 UPSTREAM SUPPLY VOLTAGE DIGITAL SAMPLER DIGITAL SAMPLER LEVEL SENSE AND ...

Page 4

DS1707/DS1708 TIMING DIAGRAM: PUSHBUTTON RESET Figure 4 PBRST RST RST NON–MASKABLE INTERRUPT CIRCUIT EXAMPLE Figure 5 V SENSE SENSE Example: V SENSE V = 3.3 volts CC 10K = R2 4.70 Therefore: x 3.3 1.25 R1 ...

Page 5

TIMING DIAGRAM: NON–MASKABLE INTERRUPT Figure 6 V > 1.25V IN V TP(MAX) NMI TIMING DIAGRAM: POWER DOWN Figure RST RST TP(MIN) t IPD CCTP(MAX) V CCTP V CCTP(MIN) t ...

Page 6

DS1707/DS1708 TIMING DIAGRAM: POWER UP Figure 010996 6 CCTP(MAX) V CCTP V CCTP(MIN) t RPU RST RST RST RST ...

Page 7

... Supply Voltage PBRST Input High Level PBRST Input Low Level DC ELECTRICAL CHARACTERISTICS PARAMETER V 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 @ 2.4 volts Output Current @ 0.4 volts Output Voltage ...

Page 8

DS1707/DS1708 AC ELECTRICAL CHARACTERISTICS PARAMETER PBRST = V 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 PBRST Stable Low to RST and ...

Page 9

... and D represents the device type and tolerance. ABCD 707_ – DS1707 708_ – DS1708 708R – DS1708R 708S – DS1708S 708T – DS1708T WWY represents the device manufacturing Work Week, and Year ABCD WWY (118 MIL) DS1707/DS1708 010996 9/9 ...

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