AS1904_1 Datasheet, PDF (1/9 Pages) ams AG – Ultra Low-Power uP Supervisory Circuit

AS1904, AS1905, AS1906
Ultra Low-Power µP Superviso
1 General Description
The AS1904/5/6 family is an ultra low-power supervisory
ry
2
!
Circuit
Key Features
Low 150nA (typical) Supply
Data She
Curre^Cnt^{oWnosrPuldmo'wspetLiroonw!est}
e
t
circuit device.
! _{Precision Monitoring of 2.5-, 3-, and 3.3V-Power}
The device can be used to monitor the supply voltage of
Supplies
digital systems and microprocessors and initiate a reset
when the voltage goes below a predefined threshold.
The duration of the reset is 5/20/100/500ms (typ.) after
! _{Supply Voltage Range 1.0 to 3.6V}
! _{Reset Threshold Available from 2.2 to 3.1V}
the supply voltage has risen above the threshold.
! _{Available in three Versions}
The device exhibits excellent reliability and can reduce
application costs by eliminating all external components.
The device is available with different output drivers:
! _{The AS1904 has a push-pull driver with an active low}
reset.
! _{The AS1905 uses the same output stage as the}
- AS1904 Push-Pull RESETN
- AS1905 Push-Pull RESET
- AS1906 Open Drain RESETN
! _{4 Time-Out Periods Ranging from 5 to 500ms}
! _{Detection Voltage Accuracy: ±1.5%}
AS1904, but has an active high reset.
! _{Temperature Range: -40 to +85°C}
! _{The AS1906 has an open drain output with active low}
reset.
All devices operate down to a voltage of 1V.
The reset thresholds are factory-trimmable between
! _{SOT23-3 Package}
! _{Superior Upgrade to austriamicrosystems}
AS1901/2/3 Device Family
2.2V and 3.08V in steps of approximately 100mV.
3 Applications Each device of the AS1904/5/6 family is offered with four
time-out periods of 5/20/100/500ms.
The extremely low current consumption of only 150nA
(typ) at 3.3V makes the device ideal for use in portable
applications.
All devices are available in a 3-pin SOT23 package.
The devices are ideal for computers, intelligent instru-
ments, controllers, critical microprocessor and micro-
controller, power monitoring and portable/battery-
powered equipment.
Figure 1. Functional Block Diagrams
VCC
3
VDD
VCC
AS1904
AS1905
RESET, 2
RESETN
GND
1
Microprocessor
RESET
GND
VCC
3
VDD
AS1906
2
RESETN
GND
1
VCC
Microprocessor
RESET I/O
GND
www.austriamicrosystems.com
Revision 1.41
1-9