AS1906 Ver la hoja de datos (PDF) - austriamicrosystems AG
Número de pieza
componentes Descripción
Fabricante
AS1906 Datasheet PDF : 10 Pages
| |||
AS1904, AS1905, AS1906
Data Sheet - Detailed Description
8 Detailed Description
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).
Negative-Going VDD Transients
The device is optimized to ignore short-duration, negative-going VDD transients (glitches) in order to avoid incorrect
lid resets.
In the graph Maximum Transient Duration vs. Reset Threshold Overdrive (page 6) , 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
a have when a reset signal is generated. As the amplitude of the transient increases, the maximum allowable pulse width
decreases.
v Options
ill Table 4. Coding of Factory-trimmed Reset Active Time-Out Period
t Device
Suffix
tTP in Milliseconds
Min
Typ
Max
G s AS190x_xx
A
3
5
8
AS190x_xx
B
12
20
32
A t AS190x_xx
C
60
100
160
AS190x_xx
D
300
500
800
s n Table 5. Output Variants
e Device
m t AS1904xxx
a n AS1905xxx
AS1906xxx
Output Functionality
Active Low (RESETN)
Active High (RESET)
Open Drain (RESETN)
o Table 6. Coding of Factory-Trimmed Reset Threshold Voltages
cReset Threshold Voltage, VTH in V
l Device
Suffix
TA = +25°C
TA = -40 to +85°C
Min
Typ
Max
Min
Max
a AS190xx__
22
2.167
2.2
2.233
2.145
2.255
AS190xx__
23
2.285
2.32
2.355
2.262
2.378
ic AS190xx__
24
2.364
2.4
2.436
2.340
2.460
AS190xx__
25
2.463
2.5
2.538
2.438
2.563
n AS190xx__
26
2.591
2.63
2.669
2.564
2.696
AS190xx__
27
2.660
2.7
2.741
2.633
2.768
h AS190xx__
28
2.758
2.8
2.842
2.730
2.870
c AS190xx__
29
2.886
2.93
2.974
2.857
3.003
AS190xx__
30
2.955
3.0
3.045
2.925
3.075
TeAS190xx__
31
3.034
3.08
3.126
3.003
3.157
www.austriamicrosystems.com
Revision 1.41
6-9
Share Link: 