AS1910 - AS1915
D u a l - Vo l ta g e 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 AS1910 - AS1915 microprocessor supervisory cir-
cuits were designed to generate a reset when one of the
two monitored supply voltages falls below a factory-
trimmed threshold, and to maintain the reset for a mini-
mum timeout period when both supplies are above their
reset thresholds. Guaranteed to be in the correct state
for V
CC
higher than +1.0V, these devices are ideal for
multiple-voltage systems with strict monitoring require-
ments.
The AS1913/AS1914/AS1915 feature factory-trimmed
thresholds to monitor a primary voltage between 1.8 and
3.6V, and a secondary voltage between 0.9 and 2.5V.
For the AS1910/AS1911/AS1912, a secondary monitor-
ing voltage can be user-adjusted via an external resistor
divider down to 0.6V.
The devices are available with the reset output types
listed in
Table 1. Standard Products
Model
AS1910/AS1913
AS1911/AS1914
AS1912/AS1915
Reset Output Type
Active-Low Push/Pull
Active-High Push/Pull
Active-Low Open-Drain
2 Key Features
!
!
Primary V
CC
Supervisory Range: +1.8 to +3.6V
Secondary V
CC
Supervisory Range: +0.9 to +2.5V
(AS1913/AS1914/AS1915)
User-Adjustable Threshold Down to +0.63V
(AS1910/AS1911/AS1912)
Guaranteed Reset Valid Down to V
CC
= +1.0V
Reset Timeout Delay: 215ms
Manual Reset Input
Three Reset Output Types
- Active-High Push/Pull
- Active-Low Push/Pull
- Active-Low Open-Drain
Watchdog Timeout Period: 1.5s
Immune to Fast Negative V
CC
Transients
External Components Not Required
Operating Temperature Range: -40 to +125°C
6-pin SOT23 Package
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The AS1910 - AS1915 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 AS1910 - AS1915 are available in a 6-pin SOT23
package.
Figure 1. Typical Application Diagram
3 Applications
The devices are ideal for portable and battery-powered
systems, embedded controllers, intelligent instruments,
automotive systems, critical CPU monitoring, and any
multi-supply application.
V
CC
6
I/O Supply
Core
Supply
V
CC
5
V
CC2
V
CC2
3
External
Reset
MRN
AS1913/
AS1915
1
RESETN
4
WDI
I/O
RESETN
CPU
GND
GND
2
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