DS1707ESA Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 3.3 and 5.0-Volt MicroMonitor

www.maxim-ic.com
DS1707/DS1708
3.3 and 5.0-Volt MicroMonitor
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
systems
§ Eliminates the need for discrete components
§ 20% tolerance compatible with 3.0V systems
§ Pin compatible with the MAXIM
MAX707/MAX708 in 8-pin DIP, 8-pin SOIC
packages
§ 8-pin DIP, 8-pin and m-SOP SOIC and 8-pin
m-SOP packages available
§ Industrial temperature range -40°C to +85°C
PIN ASSIGNMENT
PBRST 1
8 ^RST
VCC
2
GND 3
7 RST
6 NC
IN ⁴
5 NMI
8-Pin DIP (300-mil)
PBRST
18
RST
VCC
GND
IN
27
36
45
RST
NC
NMI
8-Pin SOIC (150-mil)
RST 1
RST 2
PBRST 3
VCC 4
8 NC
7 NMI
6 IN
5 GND
8-Pin m-SOP (118-mil)
See Mech. Drawings Section on website
DS1707 and DS1708_R/S/T
PIN DESCRIPTION
PBRST
V_CC
GND
IN
- Pushbutton Reset Input
- Power Supply
- Ground
- Input
NMI
- Non-maskable Interrupt
NC
- No Connect
RST
- Active Low Reset Output
RST
- Active High Reset Output
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_CC at the device and at an upstream point for maximum
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_CC returns to an in-tolerance condition, the reset signal is kept in the
active state for a minimum of 130 ms to allow the power supply and processor to stabilize.
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