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AS1903C26

P1-P3P4-P6P7-P9
www.austriamicrosystems.com Revision 1.51 4 - 9
AS1901, AS1902, AS1903
Data Sheet - Electrical Characteristics
6 Electrical Characteristics
VDD = Full Range; TA = -40 to +85ºC; Unless Otherwise Specified
Notes:
1
See Table 6, “Coding of Factory-Trimmed Reset Threshold Voltages,” on page 6.
2
Guaranteed by design.
3
See Table 4, “Coding of Factory-trimmed Reset Active Time-Out Period,” on page 6.
Table 3. Electrical Characteristics
Parameter Symbol Conditions Min Typ Max Unit
V
DD Range VDD
TA = 0 to +70°C 1.0 3.6
V
TA = -40 to +85°C 1.2 3.6
Supply Current (AS1901/2/3) I
DD VDD = 3.3V, No Load 230 430 nA
Reset Threshold Voltage
1
V
TH
TA = +25°C
VTH -
1.5%
VTH
VTH +
1.5%
V
T
A = -40 to +85°C
VTH -
2.5%
VTH
VTH +
2.5%
V
DD to Reset Delay
2
tRD VDD = VTH to (VTH - 100mV) 20 50 µs
Reset Active Time-Out Period
3
tTP
tTP -
40%
tTP
tTP +
60%
ms
RESETN Output Voltage (AS1901/3) V
OL
ISINK = 1.2mA, VDD = 2.1V, Reset
Asserted
0.4 V
ISINK = 400µA, VDD = 1.2V, Reset
Asserted
0.4 V
RESETN Output Voltage (AS1901) V
OH ISOURCE = 1.2mA, VDD = 3.2V
0.8 x
VDD
V
RESET Output Voltage (AS1902)
V
OH
ISOURCE = 500µA, VDD = 2.1V,
Reset Asserted
0.8 x
VDD
V
ISOURCE = 100µA, VDD = 1.2V,
Reset Asserted
0.8 x
VDD
V
V
OL
ISINK = 1.2mA, VDD = 3.2V,
Reset Not Asserted
0.4 V
RESET Threshold Hysteresis V
HYST 10 mV
Open-Drain RESETN Output
Leakage Current (AS1903)
ILEAK 0.1 µA
www.austriamicrosystems.com Revision 1.51 5 - 9
AS1901, AS1902, AS1903
Data Sheet - Typical Operating Characteristics
7 Typical Operating Characteristics
Figure 3. Supply Current vs. Temperature Figure 4. Power Down Reset Delay vs. Temp.
Figure 5. Power-Up Reset Timeout vs. Temperature Figure 6. Max. Trans. Duration vs. Reset Th. Overdrive
0
0.1
0.2
0.3
0.4
0.5
-40 -15 10 35 60 85
Temperature(°C)
Supply Current (mA) .
0
25
50
75
100
125
150
175
200
-40 -15 10 35 60 85
Temperature(°C)
Reset Delay (µs) .
V
OD
= 10mV
0
25
50
75
100
125
150
175
200
-40 -15 10 35 60 85
Temperature(°C)
Power-Up Reset Timeout (ms) .
0
25
50
75
100
125
150
175
200
1 10 100 1000
Reset Th. Overdrive V
TH
-V
CC
(mV)
Max. Transient Duration (µs) .
www.austriamicrosystems.com Revision 1.51 6 - 9
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
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 V
DD transient may have
when a reset signal is generated. As the amplitude of the transient increases, the maximum allowable pulse width
decreases.
Options
Table 4. Coding of Factory-trimmed Reset Active Time-Out Period
Device Suffix
tTP in Milliseconds
Min Typ Max
AS190x_xx A 3 5 8
AS190x_xx B 12 20 32
AS190x_xx C 60 100 160
AS190x_xx D 300 500 800
Table 5. Output Variants
Device Output Functionality
AS1901xxx Active Low (RESETN)
AS1902xxx Active High (RESET)
AS1903xxx Open Drain (RESETN)
Table 6. Coding of Factory-Trimmed Reset Threshold Voltages
Device Suffix
Reset Threshold Voltage, VTH in V
TA = +25°C TA = -40 to +85°C
Min Typ Max Min Max
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
AS190xx__ 25 2.463 2.5 2.538 2.438 2.563
AS190xx__ 26 2.591 2.63 2.669 2.564 2.696
AS190xx__ 27 2.660 2.7 2.741 2.633 2.768
AS190xx__ 28 2.758 2.8 2.842 2.730 2.870
AS190xx__ 29 2.886 2.93 2.974 2.857 3.003
AS190xx__ 30 2.955 3.0 3.045 2.925 3.075
AS190xx__ 31 3.034 3.08 3.126 3.003 3.157
P1-P3P4-P6P7-P9

AS1903C26

Mfr. #:
Buy AS1903C26
Manufacturer:
ams
Description:
Supervisory Circuits 230nA Low Power uP Supervisory IC
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New from this manufacturer.
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