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AS1916 Datasheet(PDF) 1 Page - ams AG

Part No. AS1916
Description  Microprocessor Supervisory Circuits with Manual Reset and Watchdog
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS1916 Datasheet(HTML) 1 Page - ams AG

 
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AS1916 - AS1918
Microprocessor Supervisory Circuits with Manual
Reset and Watchdog
austriamicrosystems
Data Sheet
www.austriamicrosystems.com
Revision 0.52
1 - 13
1 General Description
The AS1916 - AS1918 microprocessor supervisory cir-
cuits were designed to generate a reset when the moni-
tored supply voltage falls below a factory-trimmed
threshold. The reset remains asserted for a minimum
timeout period after the supply voltage stabilizes.
Guaranteed to be in the correct state for VCC higher than
+1.0V, these devices are ideal for portable and battery-
powered systems with strict monitoring requirements.
The devices feature factory-trimmed thresholds to moni-
tor a supply voltage between 1.8 and 3.6V.
The devices are available with the reset output types
listed in Table 1.
The AS1916 - AS1918 include a manual-reset input for
systems that never fully power down the microproces-
sor.
Additionally, these devices feature a watchdog timer to
help ensure that the processor is operating within proper
code boundaries.
The AS1916 - AS1918 are available in a 5-pin SOT23
package.
Figure 1. Typical Application Diagram
2 Key Features
!
VCC Supervisory Range: +1.8 to +3.6V
!
Guaranteed Reset Valid Down to VCC = +1.0V
!
Reset Timeout Delay: 215ms
!
Manual Reset Input
!
Three Reset Output Types
- Active-Low Push/Pull (AS1916)
- Active-High Push/Pull (AS1917)
- Active-Low Open-Drain (AS1918)
!
Watchdog Timeout Period: 1.5s
!
Immune to Fast Negative VCC Transients
!
External Components Not Required
!
5-pin SOT23 Package
3 Applications
The devices are ideal for portable and battery-powered
systems, embedded controllers, intelligent instruments,
automotive systems, and critical CPU monitoring appli-
cations.
Table 1. Standard Products
Model
Reset Output Type
AS1916
Active-Low Push/Pull
AS1917
Active-High Push/Pull
AS1918
Active-Low Open-Drain
AS1916/
AS1918
External
Reset
CPU
I/O Supply
VCC
GND
RESETN
I/O
4
WDI
5
VCC
3
MRN
GND 2
1
RESETN


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