AS1904(2005) Ver la hoja de datos (PDF) - austriamicrosystems AG
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componentes Descripción
Fabricante
AS1904 Datasheet PDF : 9 Pages
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AS1904, AS1905, AS1906
Data Sheet
austriamicrosystems
Interfacing to Microprocessors with Bi-Directional Reset Pins
6 Operation
6.1 Interfacing to Microprocessors with Bi-Directional Reset Pins
The device has an open drain RESETN output, which enables easy interfacing to microprocessors (µP) with bi-direc-
tional reset pins, such as the Motorola 68HC11. The RESETN pin of the microcontroller (µC) can be connected directly
to the µP supervisor's RESETN output with a single pull-up resistor (see Figure 1 on page 1).
6.2 Operating Characteristics
Supply Current vs. Temperature VCC = 3.3V
0.5
0.4
0.3
0.2
0.1
0
-40
-20
0
20
40
60
80
Temperature (°C)
P o w er-D o w n R eset D elay
vs. Temperature V OD = 10m V
200
150
100
50
0
-40
-2 0
0
20
40
60
80
T e mpe rature (°C)
Power-Up Reset Timeout
vs. Temperature
200
160
120
80
40
0
-40
-20
0
20
40
60
80
Temperature (°C)
Maximum Transient Duration
vs. Reset Threshold Overdrive
400
300
200
100
0
1
10
100
1000
Reset Threshold Overdrive
Vth-Vcc (mV)
6.3 Negative-Going VDD Transients
The device is optimized to ignore short-duration, negative-going VDD transients (glitches) in order to avoid incorrect
resets.
In the graph Maximum Transient Duration vs. Reset Threshold Overdrive (page 4) , the conditions are shown, for
which the reset pulses are not generated. In the graph the maximum pulse width that a negative VDD transient may
have when a reset signal is generated. As the amplitude of the transient increases, the maximum allowable pulse width
decreases.
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Revision 1.4
4-9
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