Impala Linear Corporation
ILC803/ILC809/ILC810
3-Pin µP Voltage Monitor
Package Features
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•
•
•
•
•
•
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Precision Voltage Monitor for 3V, 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 SC-70 package option
Applications
•
•
•
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Critical Microprocessor Power Monitoring
Portable Equipment
Intelligent Instruments
Computers & Printers, Controllers
Preliminary
General Description
The ILC803, ILC809 and ILC810 are low cost microproces-
sor supervisory circuits that assert a reset if the power sup-
ply 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 des-
ignated reset threshold. The ILC803, ILC809 and
ILC810 are available in either a 3-Pin SOT-23 pack-
age or a 3-Pin SC-70 packages.
Typical Circuit
V
CC
Ordering Information
V
CC
V
CC
ILC803
ILC809
ILC810
RESET
(RESET)
Part
ILC803_U
ILC809_U
ILC810_U
ILC803_W
ILC809_W
ILC810_W
Package
3-Lead SOT-23
3-Lead SOT-23
3-Lead SOT-23
3-Lead SC-70
3-Lead SC-70
3-Lead SC-70
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
µ
P
RESET
INPUT
( ) = ILC810
Place the device suffix of the desired reset threshold voltage from the table [below]
in the blank to complete the part number.
Pin Package Configurations
Top View
GND
1
ILC803
ILC809
RESET
2
3
GND
1
V
CC
RESET
2
ILC810
3
V
CC
Reset Threshold Voltage (V)
4.63
4.38
4.00
3.08
2.93
2.63
Device Suffix
L
M
J
T
S
R
SC-70
SOT-23
Impala Linear Corporation
ILC803/809/810 1.4
(408) 574-3939
www.impalalinear.com
Sept 1999
1
3-Pin µP Voltage Monitor
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 (T
A
= +70°C)
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
Preliminary
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 reliabil-
ity. Operating ranges define those limits between which the functionality of the device is guaranteed.
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 otherwise noted.
Parameter
Conditions
Min
Typ
Max
Units
Operating Voltage Range, V
CC
T
A
= 0°C to 70°C
1.4
5.5
V
T
A
= -40°C to 85°C
1.6
5.5
Supply Current, I
CC
ILC803L/M/J, ILC809L/M/J, ILC810L/M/J
9
15
µA
V
CC
< 3.6V, ILC803R/S/T, ILC809R/S/T, ILC810R/S/T
6
10
Reset Voltage Threshold, V
TH
ILC803L, ILC809L, ILC810L
4.50
4.63
4.75
V
ILC803M, ILC809M, ILC810M
4.25
4.38
4.50
ILC803J, ILC809J, ILC810J
3.89
4.00
4.10
ILC803T, ILC809T, ILC810T
3.00
3.08
3.15
ILC803S, ILC809S, ILC810S
2.85
2.93
3.00
ILC803R, ILC809R, ILC810R
2.55
2.63
2.70
Reset Timeout Period, t
R
140
240
560
ms
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
V
CC
= V
TH
V
CC
=V
TH
I
SINK
= 1.2mA
I
SINK
= 3.2mA
0.3
0.4
7
V
CC
– 1.5
0.8 x V
CC
0.4
0.3
0.3
0.3
0.8 x V
CC
0.4
0.3
V
V
µA
V
V
V
CC
> V
TH
RESET Deasserted
I
SOURCE
= 800
µA,
ILC809L/M/J
I
SOURCE
= 500
µA,
ILC809R/S/T
V
CC
= V
TH
Min., I
SINK
= 3.2 mA, ILC809L/M/J
V
CC
= V
TH
Min., I
SINK
= 1.2 mA, ILC809R/S/T
V
CC
> 1.4 V, I
SINK
= 50
µA,
T
A
= 0°C to 70°C
V
CC
> 1.6 V, I
SINK
= 50
µA,
T
A
= -40°C to 85°C
1.8V < V
CC
< V
TH
Min., I
SOURCE
= 150
µA
I
SINK
= 3.2mA, ILC810L/M/J
I
SINK
= 1.2mA, ILC810R/S/T
RESET Output Voltage, V
OH
RESET Output Voltage, V
OL
V
V
Pin Functions
Pin Name
GND
RESET
Pin Number
ILC803
ILC809
ILC810
1
1
1
2
2
N/A
Description
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, 3 V, 3.3 V or 5 V.
RESET
N/A
N/A
2
V
CC
4
3
3
Impala Linear Corporation
ILC803/809/810 1.4
(408) 574-3939
www.impalalinear.com
Sept 1999
2
3-Pin µP Voltage Monitor
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
threshold voltage. The reset function ensures the micro-
processor 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
Preliminary
V
CC
3
Reset
Threshold (V)
+
-
Reset
Generator
RESET (ILC803, ILC809
2
RESET (ILC810)
1
GND
Figure 3: Block Diagram
Alternate Source Cross Reference Guide
t
R
RESET
Figure 1: Timing Diagram
t
R
Industry P/N
MAX803XYUR-T
MAX809JEUR-T
MAX809LEUR-T
MAX809MEUR-T
MAX809REUR-T
MAX809SEUR-T
MAX809TEUR-T
MAX810JEUR-T
MAX810LEUR-T
MAX810MEUR-T
MAX810REUR-T
MAX810SEUR-T
MAX810TEUR-T
V
CC
Transients
The ILC803, ILC809 and ILC810 are relatively immune to
negative-going V
CC
glitches below the reset threshold.
Typically, a negative-going transient 125mV below the reset
threshold with a duration of 50µs (25µs for ILC8__R/S/T) or
less will not cause an unwanted reset.
Interfacing to Bi-directional Reset Pins
The ILC803/ILC809/ILC810 can interface with
µPs
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
recommended. 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
ILC Direct
Replacement
ILC803YU
ILC809JU
ILC809LU
ILC809MU
ILC809RU
ILC809SU
ILC809TU
ILC810JU
ILC810LU
ILC810MU
ILC810RU
ILC810SU
ILC810TU
Device Markings Information
ILC803J
ILC803L
ILC803M
ILC803R
ILC803S
ILC803T
ILC809J
ILC809L
ILC809M
ILC809R
ILC809S
ILC809T
ILC810J
ILC810L
ILC810M
ILC810R
ILC810S
ILC810T
SC-70 Case
QJX
QLX
QMX
QRX
QSX
QTX
VJX
VLX
VMX
VRX
VSX
VTX
ZJX
ZCX
ZMX
ZRX
ZSX
ZTX
X-LOT CODE
SOT-23 Case
QJXX
QLXX
QMXX
QRXX
QSXX
QTXX
VJXX
VLXX
VMXX
VRXX
VSXX
VTXX
ZJXX
ZCXX
ZMXX
ZRXX
ZSXX
ZTXX
XX-LOT CODE
100K
ILC803
only
ILC803
ILC809
RESET
100K
ILC809
only
RESET
µP
Figure 2: Reset valid to V
CC
Impala Linear Corporation
ILC803/809/810 1.4
(408) 574-3939
www.impalalinear.com
Sept 1999
3
3-Pin µP Voltage Monitor
Preliminary
Packaging Information
U Package, 3-Pin SOT-23
0.021
0.015
Dimensions are in inches
0.055
0.047
0.098
0.083
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 SC-70
.087
.071
Dimensions are in inches
.053
.045
.087
.079
.009
.005
.043
.032
.004
.010
.004
.026
.051
.016
.012
.018
.006
Impala Linear Corporation
ILC803/809/810 1.4
(408) 574-3939
www.impalalinear.com
Sept 1999
4
3-Pin µP Voltage Monitor
Preliminary
Tape and Reel Information
Diagram applies to SOT-23 and SC-70
4.0 ± 0.1
2.0 ± 0.05
O1.5 ± 0.1
1.75 ± 0.1
3.5 ± 0.05
8.0 ± 0.3
O1.1 ± 0.1
4.0 ± 0.1
2.7 ± 0.1
1.2 ± 0.1
Dimensions are in millimeters
3.1 ± 0.1
Devices sold by Impala Linear Corporation are covered by the warranty and patent indemnification provisions appearing
in its Terms of Sale only. Impala Linear Corporation makes no warranty, express, statutory, implied, or by description
regarding the information set forth herein or regarding the freedom of the described devices from patent infringement.
Impala Linear Corporation makes no warranty of merchantability or fitness for any purpose. Impala Linear Corporation
reserves the right to discontinue production and change specifications and prices at any time and without notice.
This product is intended for use in normal commercial applications. Applications requiring an extended temperature
range, unusual environmental requirements, or high reliability applications, such as military and aerospace, are specif-
ically not recommended without additional processing by Impala Linear Corporation.
Impala Linear Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in an
Impala Linear Corporation product. No other circuits, patents, licenses are implied.
Life Support Policy
Impala Linear Corporation’s products are not authorized for use as critical components in life support devices or systems.
1.
Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for
use provided in the labelling, can be reasonably expected to result in a significant injury to the user.
2.
A critical component is any component of a life support device or system whose failure to perform can be reason-
ably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Impala Linear Corporation
ILC803/809/810 1.4
(408) 574-3939
www.impalalinear.com
Sept 1999
5
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