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PDF AS1918 Data sheet ( Hoja de datos )
| Número de pieza | AS1918 | |
| Descripción | Microprocessor Supervisory Circuit | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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Datasheet
AS1916 - AS1918
Microprocessor Supervisory Circuits with Manual Reset and Watchdog
1 General Description
The AS1916 - AS1918 microprocessor supervisory circuits were
designed to generate a reset when the monitored 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 monitor a supply
voltage between 1.8 and 3.6V.
The devices are available with the reset output types listed in Table
1.
Table 1. Standard Products
Model
Reset Output Type
AS1916
Active-Low Push/Pull
AS1917
Active-High Push/Pull
AS1918
Active-Low Open-Drain
The AS1916 - AS1918 include a manual-reset input for systems that
never fully power down the microprocessor.
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.
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
Operating Temperature Range: -40 to +125°C
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 applications.
Figure 1. Typical Application Diagram
VCC
External
Reset
5
VCC
1
RESETN
AS1916/
AS1918
3
MRN
GND 2
4
WDI
RESETN
I/O Supply
CPU
GND
I/O
www.austriamicrosystems.com/Supervisors/AS1916
Revision 1.04
1 - 14
1 page  
AS1916 - AS1918
Datasheet - Electrical Characteristics
Table 4. Electrical Characteristics
Symbol
Parameter1
VOH
RESET Output High
(Push/Pull Only)
VOL
RESET Output Low
(Push/Pull Only)
Manual Reset Input
VIL
MRN Input voltage
VIH
Watchdog Input
MRN Minimum Input Pulse
MRN Transient Rejection
MRN to Reset Delay
MRN Pullup Resistance
tWD Watchdog Timeout Period
tWDI WDI Pulse Width 2
VIL
WDI Input Voltage
VIH
IWDI WDI Input Current
Conditions
VCC ≥ 1.0V, ISOURCE = 1µA,
Reset Asserted, TAMB = 0 to +85ºC
VCC ≥ 1.50V, ISOURCE = 100µA,
Reset Asserted
VCC ≥ 2.55V, ISOURCE = 500µA,
Reset Asserted
VCC ≥ 3.3V, ISOURCE = 800µA,
Reset Asserted
VCC ≥ 1.8V, ISINK = 500µA,
Reset Asserted
VCC ≥ 3.15V, ISINK = 1.2mA,
Reset Asserted
VCC ≥ 3.3V, ISINK = 3.2mA,
Reset Asserted
TAMB = -40 to +85ºC
TAMB = -40 to +125ºC
WDI = VCC, Time Average
WDI = 0, Time Average
Min
0.8 x
VCC
0.8 x
VCC
0.8 x
VCC
0.8 x
VCC
Typ
Max Units
V
0.3
0.3 V
0.4
0.3 x
0.7 x VCC V
VCC
1 µs
90 ns
130 ns
25 50 75 kΩ
1.12
0.80
1.5
2.4
2.60
s
20 ns
0.3 x
0.7 x VCC V
VCC
-20
80
-11
160 µA
1. Over-temperature limits are guaranteed by design and not production tested. Devices tested at +25ºC.
2. Guaranteed by design and not production tested.
Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality
Control) methods.
www.austriamicrosystems.com/Supervisors/AS1916
Revision 1.04
5 - 14
5 Page 
AS1916 - AS1918
Datasheet - Package Drawings and Markings
10 Package Drawings and Markings
Figure 14. 5-pin SOT23 Marking
Top Marking
Bottom Marking
xxxx- encoded Datacode
www.austriamicrosystems.com/Supervisors/AS1916
Revision 1.04
11 - 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AS1918.PDF ] | |
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