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PDF AS1926 Data sheet ( Hoja de datos )
| Número de pieza | AS1926 | |
| Descripción | Ultra-Low Voltage Microprocessor Supervisory Circuit | |
| Fabricantes | austriamicrosystems AG | |
| Logotipo |  |
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AS1925, AS1926
Ultra-Low Voltage Microprocessor Supervisory
Circuit with Manual Reset
Data Sheet
1 General Description
2 Key Features
The AS1925/AS1926 microprocessor supervisory cir-
cuits were designed to assert a single reset if the moni-
tored supply voltage drops below its reset threshold or if
the manual reset is activated. The reset remains
asserted for a fixed timeout delay after VCC has risen
above the reset threshold and the manual reset is deas-
serted.
Their small size, excellent circuit reliability, and low sup-
ply current (3.5µA) make the AS1925/AS1926 a very
low cost solution by eliminating external components
and adjustments when used with low-voltage (+0.9 to
+1.5V) systems.
The devices are available as the standard products
listed in Table 1.
Table 1. Standard Products
Model
Output Type
AS1925
Active-Low Push/Pull,
Active-High Push/Pull
AS1926
Active-High Push/Pull,
Active-Low Open-Drain
The active-low open-drain reset output requires a pullup
resistor that can be connected to a voltage from 0 to
VCC. The reset comparator was specifically designed to
ignore fast VCC transients.
The devices are available in a 5-pin SOT23 package.
! Factory-Trimmed Reset Thresholds for Monitoring
Supplies from 0.9 to 1.5V
! Low Power Consumption: 3.5µA
! Reset Threshold Accuracy Over Temperature:
±2.5%
! Four Timeout Periods: 1.5ms, 30ms, 210ms, and
1.68s
! Three Reset Output Types:
- Active-Low Push/Pull
- Active-High Push/Pull
- Active Low Open-Drain
! Guaranteed Reset Valid to VCC = 0.55V (Active-
Low)
! Manual Reset Input
! Immune to Fast VCC Transients
! 5-pin SOT23 Package
3 Applications
Figure 1. Block Diagram and Pinout
The device is ideal for portable and battery-powered
systems, embedded controllers, intelligent instruments,
automotive systems, telecommunications equipment,
networking equipment, computer workstations and serv-
ers, critical CPU monitoring applications, and any low-
voltage application.
4
MRN
5
VCC
MRN
+
–
Pullup
VREF
+
–
AS1925/
AS1926
Manual Reset
Detect
Reset Timeout
Period
Reset
Output
3
RESET
1
RESETN
RESETN 1
5 VCC
AS1925/
GND 2 AS1926
RESET 3
4 MRN
GND 2
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Revision 1.00
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1 page  
AS1925/AS1926
Data Sheet - Electrical Characteristics
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Table 4. Electrical Characteristics (Continued)
Symbol
Parameter 1
Conditions
VOH
RESET Push/Pull Output
Voltage
VCC = 0.75V, ISOURCE = 10µA,
Reset Asserted
VCC = 0.83V, ISOURCE = 40µA,
Reset Asserted
VOL
VCC = 0.83V, ISINK = 80µA,
Reset Not Asserted
Min Typ Max Units
0.8 ×
VCC
0.8 ×
VCC
0.2 ×
VCC
V
1. 100% production tested at +25ºC. Over-temperature limits are guaranteed by design.
2. The active-low output RESETN VCC(MIN) = 0.55V.
3. For VCC > 0.788V, TAMB = 0 to +85ºC; for VCC > 0.833V, TAMB = -40 to +85ºC.
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Revision 1.00
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5 Page 
AS1925/AS1926
Data Sheet - Ordering Information
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11 Ordering Information
The AS1925/AS1926 are available as the standard products shown in Table 5.
Table 5. Ordering Information
Model
Description
AS1925-BSTT-xyy1
Ultra-Low Reset Threshold with
Manual Reset
AS1925-BSTT-D07
Ultra-Low Reset Threshold (0.81V)
with Manual Reset
AS1926-BSTT-D07
Ultra-Low Reset Threshold (0.81V)
with Manual Reset, Open-Drain
Timeout Period
140ms Reset
140ms Reset
Delivery Form Package
Tape and Reel 5-pin SOT23
Tape and Reel 5-pin SOT23
Tape and Reel 5-pin SOT23
1. xx and y is a placeholder for variants, e.g., AS1926-BSTT-D07 offers 0.81V (max) reset threshold and a 140ms
minimum timeout periode (see Table 6).
Available upon request. Contact austriamicrosystems, AG for more information.
Table 6. Model Variants
Suffix (x) Reset timout (ms)
min typ max
B 1 1.5 2
C 20 30 40
D 140 210 280
E 1120 1680 2240
Suffix (yy) Reset Threshold (V)
min typ max
14 1.350 1.388 1.425
13 1.275 1.313 1.350
11 1.080 1.110 1.140
10 1.020 1.050 1.080
08 0.810 0.833 0.855
07 0.765 0.788 0.810
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Revision 1.00
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AS1926.PDF ] | |
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