AS1901C23 查看數據表（PDF） - austriamicrosystems AG
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AS1901C23 Datasheet PDF : 10 Pages
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AS1901, AS1902, AS1903
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 have
a 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 AS1901xxx
a n AS1902xxx
AS1903xxx
Output Functionality
Active Low (RESETN)
Active High (RESET)
Open Drain (RESETN)
co Table 6. Coding of Factory-Trimmed Reset Threshold Voltages
l Reset Threshold Voltage, VTH in V
Device
Suffix
TA = +25°C
TA = -40 to +85°C
aMin
Typ
Max
Min
Max
ic AS190xx__
22
2.167
2.2
2.233
2.145
2.255
AS190xx__
23
2.285
2.32
2.355
2.262
2.378
AS190xx__
24
2.364
2.4
2.436
2.340
2.460
n AS190xx__
25
2.463
2.5
2.538
2.438
2.563
AS190xx__
26
2.591
2.63
2.669
2.564
2.696
h AS190xx__
27
2.660
2.7
2.741
2.633
2.768
c AS190xx__
28
2.758
2.8
2.842
2.730
2.870
AS190xx__
29
2.886
2.93
2.974
2.857
3.003
eAS190xx__
30
2.955
3.0
3.045
2.925
3.075
TAS190xx__
31
3.034
3.08
3.126
3.003
3.157
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Revision 1.51
6-9
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