AS1916 - AS1918
M i c r o p r o c e s s o r S u p e r v i s o r y C i r c u i ts w i t h M a n u a l
R e s e t a n d Wa t c h d o g
D a ta S he e t
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 V
CC
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. Standard Products
Model
AS1916
AS1917
AS1918
Reset Output Type
Active-Low Push/Pull
Active-High Push/Pull
Active-Low Open-Drain
2 Key Features
!
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V
CC
Supervisory Range: +1.8 to +3.6V
Guaranteed Reset Valid Down to V
CC
= +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 V
CC
Transients
External Components Not Required
Operating Temperature Range: -40 to +125°C
5-pin SOT23 Package
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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.
3 Applications
The devices are ideal for portable and battery-powered
systems, embedded controllers, intelligent instruments,
automotive systems, and critical CPU monitoring appli-
cations.
Figure 1. Typical Application Diagram
I/O Supply
V
CC
5
1
RESETN
RESETN
V
CC
AS1916/
AS1918
3
External
Reset
MRN
4
WDI
GND
2
I/O
CPU
GND
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