www.fairchildsemi.com
ILC803/ILC809/ILC810
3-Pin µP Voltage Monitor
Features
• Precision Voltage Monitor for3V, 3.3V or 5V Power
Supplies
• 6µA Supply Current
• 140ms Minimum Reset Pulse Width
• RESET Remains Valid with V
CC
as Low as 1.4V
• Active Low Manual Reset Input
• No External Components
• 3-Pin SOT-23 Package
• 3-Pin SC70 package option
Description
The ILC803, ILC809 and ILC810 are low cost
microprocessor supervisory circuits that assert a reset if the
power supply drops below a designated threshold. Several
different reset thresholds are available to accommodate
systems operating at 3V, 3.3V or 5V.
The ILC803 has an open drain output stage with active low
RESET output
The ILC809 has an active low RESET output, while the
ILC810 offers an active high RESET output. The reset output
is guaranteed to remain asserted for a minimum of 140ms
after V
CC
has risen above the designated reset threshold. The
ILC803, ILC809 and ILC810 are available in either a 3-Pin
SOT-23 package or a 3-Pin SC70 packages.
Preliminary Information
Applications
•
•
•
•
Critical Microprocessor Power Monitoring
Portable Equipment
Intelligent Instruments
Computers & Printers, Controllers
Typical Applications
V
CC
V
CC
ILC803
ILC809
ILC810
RESET
(RESET)
RESET
INPUT
V
CC
mP
( ) = ILC810
Rev. 1.6
PRELIMINARY INFORMATION
describes products that are in the design stage. Specifications
may change in any manner whatever without notice. Contact Fairchild Semiconductor for
current information.
©2001 Fairchild Semiconductor Corporation
ILC803/ILC809/ILC810
Pin Assignments
Top View
GND
1
ILC803
ILC809
RESET
2
3
GND
1
V
CC
RESET
2
ILC810
3
V
CC
Pin Definitions
Pin Name
ILC803
Pin Number
ILC809
1
2
ILC810
1
N/A
Ground Pin
RESET goes low if V
CC
falls below the reset threshold and
remains asserted for one reset timeout period (140ms min.)
after V
CC
exceeds the reset threshold.
RESET goes high if V
CC
falls below the reset threshold and
remains asserted for one reset timeout period (140ms min.)
after V
CC
exceeds the reset threshold.
Power supply input, 3V, 3.3V, or 5V
1
2
Description
Preliminary Information
GND
RESET
RESET
N/A
N/A
2
V
CC
4
3
3
Internal Block Diagram
V
CC
3
Reset
Threshold (V)
+
-
Reset
Generator
RESET (ILC803, ILC809)
2
RESET (ILC810)
1
GND
Absolute Maximum Ratings
Parameter
Terminal Voltage
Input Current
Output Current
Rate of Rise
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
Power Dissipation
Symbol
V
CC
V
CC
RESET, RESET
V
CC
T
A
Ratings
-0.3 to 6.0
20
20
100
-40 to +85
-65 to +150
300
320
Units
V
mA
mA
V/µs
°C
°C
°C
mW
Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or
above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability.
Operating ranges define those limits between which the functionality of the device is guaranteed.
©2001 Fairchild Semiconductor Corporation
2
ILC803/ILC809/ILC810
Electrical Characteristics
V
CC
= 5V for ILC8_L/M/J, V
CC
= 3.3V for ILC8_S/T, V
CC
= 3V for ILC8_R, T
A
= Operating Temperature Range, unless oth-
erwise noted.
Parameter
Operating Voltage Range
Supply Current, I
CC
Conditions
T
A
= 0°C to 70°C
T
A
= -40°C to 85°C
ILC803L/M/J, ILC809L/M/J, ILC810L/M/J
V
CC
< 3.6V, ILC803R/S/T, ILC809R/S/T,
ILC810R/S/T
ILC803L, ILC809L, ILC810L
ILC803M, ILC809M, ILC810M
ILC803J, ILC809J, ILC810J
ILC803T, ILC809T, ILC810T
ILC803S, ILC809S, ILC810S
ILC803R, ILC809R, ILC810R
V
CC
= V
TH
I
SINK
= 1.2mA
V
CC
= V
TH
I
SINK
= 3.2mA
V
CC
> V
TH
RESET Deasserted
I
SOURCE
= 800µA, ILC809L/M/J
V
CC
- 1.5
I
SOURCE
= 500µA, ILC809R/S/T
0.8 x V
CC
V
CC
= V
TH
Min., I
SINK
= 3.2mA, ILC809L/M/J
V
CC
= V
TH
Min., I
SINK
= 1.2mA, ILC809R/S/T
V
CC
> 1.4V, I
SINK
= 50µA, T
A
= 0°C to 70°C
V
CC
> 1.6V, I
SINK
= 50µA, T
A
= -40°C to 85°C
1.8V < V
CC
< V
TH
Min., I
SOURCE
= 150µA
0.8 x V
CC
I
SINK
= 3.2mA, ILC810L/M/J
I
SINK
= 1.2mA, ILC810R/S/T
Min.
1.4
1.6
Typ.
Max.
5.5
5.5
15
10
4.75
4.50
4.10
3.15
3.00
2.70
560
0.3
0.4
7
Units
V
µA
9
6
4.50
4.25
3.89
3.00
2.85
2.55
140
4.63
4.38
4.00
3.08
2.93
2.63
240
Reset Voltage Threshold, V
TH
V
Preliminary Information
Reset Timeout Period, t
R
RESET Output Voltage Low
(Active low ILC803/809) V
OL
RESET Open Drain Output
Leakage Current
RESET Output Voltage, V
OH
RESET Output Voltage, V
OL
ms
V
V
µA
V
0.4
0.3
0.3
0.3
0.4
0.3
V
RESET Output Voltage, V
OH
RESET Output Voltage, V
OL
V
V
Circuit Description
Microprocessor Reset
The RESET pin is asserted whenever V
CC
falls below the
reset threshold voltage. The reset pin remains asserted for a
period of 240ms after V
CC
has risen above the reset thresh-
old voltage. The reset function ensures the microprocessor
is properly reset and powers up into a known condition after
a power failure. RESET will remain valid with V
CC
as low
as 1.4V.
V
CC
V
TH
Interfacing to Bi-directional Reset Pins
The ILC803/ILC809/ILC810 can interface with mPs with bi-
directional reset pins by connecting a 4.7kΩ resistor in series
with the ILC803/ILC809/ILC810 output and the mP reset
pin. ILC803 connects directly with a single pull-up resistor
(figure 2).
RESET Valid to 0V
A resistor can be added from the RESET pin to ground to
ensure the RESET output remains low with V
CC
down to 0V
A 100kΩ resistor connected from RESET to ground is rec-
ommended. The size of the resistor should be large enough
to not load the RESET output and small enough to pull-down
any stray leakage currents.
V
CC
V
CC
V
CC
t
R
RESET
t
R
Figure 1: Timing Diagram
100K
ILC803
only
VCC Transients
The ILC803, ILC809 and ILC810 are relatively immune to
negative-going V
CC
glitches below the reset threshold. Typi-
cally, a negative-going transient 125mV below the reset
threshold with a duration of 50ms (25ms for ILC8__R/S/T)
or less will not cause an unwanted reset.
©2001 Fairchild Semiconductor Corporation
ILC803
ILC809
RESET
100K
ILC809
only
RESET
mP
Figure 2: Reset valid to V
CC
3
ILC803/ILC809/ILC810
Packaging Information
U Package, 3-Pin SOT-23
0.021
0.015
0.055
0.047
0.098
0.083
Preliminary Information
0.120
0.105
0.040
0.031
0.079
0.071
0.0059
0.0035
0-8°
0.004
0.001
0.010
0.005
W Package, 3-Pin SC70
.087 (2.2)
.071 (1.8)
.053 (1.35)
.045 (1.15)
.087 (2.2)
.079 (2.0)
.009 (.23)
.005 (.13)
.043 (1.1)
.032 (.80)
.004 (.10)
.010 (.25)
.004 (.10)
.026
(.65)
.052
(1.3)
.016 (.40)
.012 (.30)
.018 (.45)
.006 (.15)
©2001 Fairchild Semiconductor Corporation
4
ILC803/ILC809/ILC810
Tape and Reel Information
Diagram applies to SOT-23 and SC70
4.0 ± 0.1
2.0 ± 0.05
O1.5 ± 0.1
1.75 ± 0.1
3.5 ± 0.05
8.0 ± 0.3
Preliminary Information
O1.1 ± 0.1
4.0 ± 0.1
2.7 ± 0.1
1.2 ± 0.1
Dimensions are in millimeters
3.1 ± 0.1
Ordering Information
Product
Number
ILC803_U
ILC809_U
ILC810_U
ILC803_W
ILC809_W
ILC810_W
Reset Threshold (V)
Package
3-Lead SOT-23
3-Lead SOT-23
3-Lead SOT-23
3-Lead SC70
3-Lead SC70
3-Lead SC70
Temp. Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
4.63
4.38
4.00
3.08
2.93
2.63
Device Suffix
L
M
J
T
S
R
Place the device suffix of the desired reset threshold voltage from the
table [below] in the blank to complete the part number.
©2001 Fairchild Semiconductor Corporation
5
京公网安备 11010802033920号
EEWORLD
