DS1830/A DS183
DS1830/A
Reset Sequence Pushbutton
www.maxim-ic.com
FEATURES
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5V (DS1830) or 3.3V (DS1830A) power-on
reset
Excellent for systems that need power-on
resets in a consistent sequence
Asserts resets during power transients
Pushbutton reset input for system override
Selectable reset timing
Reduces need for discrete components
Precision temperature-compensated voltage
reference
8-pin DIP, 8-pin SO, or space saving 8-pin
碌SOP
Operating temperature of -40擄C to +85擄C
Open-drain, active-low inputs
PIN ASSIGNMENT
PIN DESCRIPTION
1
PBRST
2 TD
3 TOL
4 GND
8 V
CC
7
RST1
6
RST2
5
RST3
- Pushbutton Reset Input
- Time Delay Select Input
- V
CC
Tolerance Select Input
- Ground
- Power Supply
- Reset 1 Output
- Reset 2 Output
- Reset 3 Output
DESCRIPTION
The DS1830 Reset Sequencer monitors the power supply for an in-tolerance condition and the pushbutton
reset input for a manual reset. First a precision temperature-compensated reference and comparator circuit
monitors the status of the power supply and when an out-of-tolerance condition is detected, an internal
power fail signal is generated that forces the reset lines to go to an active state. If the power supply
returns to an in-tolerance condition,
RST1
will release followed by
RST2
and finally
RST3
. Sequencing of
resets allows for systems to power-up in an orderly manner providing superior reliability.
Note:
Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any
device may be simultaneously available through various sales channels. For information about device errata, click here:
http://dbserv.maxim-
ic.com/errata.cfm.
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