CAT853, CAT859, CAT863,
CAT869
3-Pin Microprocessor
Power Supply Supervisors
Description
The CAT853, CAT863, CAT859, and CAT869 are supervisory
circuits that monitor power supplies in digital systems.
These devices generate a reset signal, which is asserted while the
power supply voltage is below a preset threshold level and for at least
140 ms after the power supply level has risen above that level.
Industry standard threshold levels are offered to support +3.3 V or
5.0 V systems.
The CAT859 and CAT869 feature a RESET push−pull output
(active low) for the two pinout options.
The CAT853 and CAT863 feature an open drain RESET output
(active low). Both require a pull−up resistor on the RESET output.
Fast transients on the power supply are ignored and the output is
guaranteed to be in the correct state at V
CC
levels as low as 1.0 V.
Features
http://onsemi.com
SOT−23
TB SUFFIX
CASE 527AG
PIN CONFIGURATION
CAT853, CAT859
1
RESET
3
V
CC
2
GND
CAT863, CAT869
1
RESET
3
GND
2
V
CC
(Top Views)
•
Precision Monitoring of +3.3 V (−5%,
−10%),
•
•
•
•
•
•
•
•
•
•
•
•
•
•
5 V (−10% Power Supplies)
Active Low Reset Output
Reset Valid down to V
CC
= 1.0 V
6
mA
Power Supply Current
Power Supply Transient Immunity
Industrial Temperature Range:
−40°C
to +85°C
SOT−23 Package
These Devices are Pb−Free and are RoHS Compliant
Computers, Servers, Laptops and Cable Modems
Wireless Communications
Embedded Control Systems
White Goods
Power Meters
Intelligent Instruments
PDAs and Handheld Equipment
Nominal Threshold Voltage
4.63 V
4.38 V
4.20 V
4.00 V
3.08 V
2.93 V
2.63 V
2.40 V
2.32 V
Threshold Suffix Designation
L
M
F
J
T
S
R
C
Z
Applications
MARKING DIAGRAM
XXXMG
G
Table 1. THRESHOLD SUFFIX SELECTOR
XXX
M
G
(*Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
1
1
= Specific Device Code
= Date Code
= Pb−Free Package
©
Semiconductor Components Industries, LLC, 2012
May, 2012
−
Rev. 10
Publication Order Number:
CAT853/D
CAT853, CAT859, CAT863, CAT869
Table 2. PIN DESCRIPTION
Pin Name
RESET
GND
V
CC
Function
Active low reset. RESET is asserted if V
CC
falls below the reset threshold and remains low for at least 140 ms after
V
CC
rises above the reset threshold
Ground
Power supply voltage that is monitored
V
CC
V
CC
V
CC
TOLERANCE
BIAS
+
–
DIGITAL
DELAY
RESET
VOLTAGE
REFERENCE
GND
CAT853
CAT863
V
CC
V
CC
V
CC
TOLERANCE
BIAS
+
–
VOLTAGE
REFERENCE
GND
DIGITAL
DELAY
RESET
CAT859
CAT869
Figure 1. Block Diagrams
Table 3. ABSOLUTE MAXIMUM RATINGS
Parameters
Any pin with respect to ground
Input Current, V
CC
Output Current, RESET
Rate of Rise, V
CC
Continuous Power Dissipation
Derate 4 mW/°C above 70°C (SOT23)
Operating Temperature Range
Storage Temperature Range
Lead Soldering Temperature (10 sec)
Ratings
−0.3
to +6.0
20
20
100
320
−40
to +85
−65
to +105
300
Units
V
mA
mA
V/ms
mW
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
http://onsemi.com
2
CAT853, CAT859, CAT863, CAT869
Table 4. ELECTRICAL CHARACTERISTICS
(V
CC
= Full range, T
A
=
−40°C
to +85°C unless otherwise noted.
Typical values at T
A
= +25°C and V
CC
= 3.3 V for the C, S, T versions, V
CC
= 5 V for the M version.)
Symbol
Parameter
V
CC
Range
I
CC
V
TH
Supply Current
Reset Threshold
Voltage
Conditions
T
A
= 0°C to +70°C
T
A
=
−40°C
to +85°C
T
A
=
−40°C
to +85°C
L Threshold
V
CC
< 3.6 V, C, S, T
T
A
= +25°C
T
A
=
−40°C
to +85°C
M Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
F Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
J Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
T Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
S Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
R Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
C Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
Z Threshold
T
A
= +25°C
T
A
=
−40°C
to +85°C
Reset Threshold
Tempco
V
CC
to Reset Delay
Reset Active
Timeout Period
V
OL
V
OH
RESET Output
Voltage Low
RESET Output
Voltage High
V
CC
= V
TH
to (V
TH
−
100 mV)
T
A
=
−40°C
to +85°C
V
CC
= V
TH
min, I
SINK
= 1.2 mA
V
CC
> 1.0 V, I
SINK
= 50
mA
V
CC
= V
TH
max, I
SOURCE
=
−500
mA
(for CAT859/869 only)
0.8 V
CC
140
4.56
4.50
4.31
4.25
4.14
4.08
3.93
3.89
3.04
3.00
2.89
2.85
2.59
2.55
2.35
2.30
2.28
2.25
30
20
240
460
0.4
0.3
V
2.32
2.40
2.63
2.93
3.08
4.00
4.20
4.38
Min
1.0
1.2
6
4.63
Typ
(Note 1)
Max
5.5
5.5
15
4.70
4.75
4.45
4.50
4.26
4.31
4.06
4.10
3.11
3.15
2.96
3.00
2.66
2.70
2.45
2.50
2.35
2.38
Units
V
mA
V
ppm/°C
ms
ms
V
1. Production testing done at T
A
= +25°C; limits over temperature guaranteed by design only.
http://onsemi.com
3
CAT853, CAT859, CAT863, CAT869
(V
CC
= Full range, T
A
=
−40°C
to +85°C unless otherwise noted. Typical values at T
A
= +25°C and V
CC
= 3.3 V
for the C, S, T versions, V
CC
= 5 V for the M version.)
260
POWER−UP RESET TIMEOUT (ms)
240
V
CC
= 5 V
220
V
CC
= 2.5 V
200
180
160
−50
12
10
V
CC
= 5.5 V
8
6
4
2
0
−50
V
CC
= 3.6 V
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
0
50
TEMPERATURE (°C)
100
150
SUPPLY CURRENT (mA)
0
50
TEMPERATURE (°C)
100
150
Figure 2. Power−Up Reset Timeout vs.
Temperature
14
POWER−DOWN RESET DELAY (ms)
NORMALIZED THRESHOLD
12
10
8
6
4
2
0
−50
0
50
TEMPERATURE (°C)
100
1.0002
1.0000
0.9998
0.9996
0.9994
0.9992
0.9990
0.9988
0
Figure 3. Supply Current vs. Temperature
(No Load)
150
20
40
60
80
100
120
TEMPERATURE (°C)
Figure 4. Power−Down Reset Delay vs.
Temperature
Figure 5. Normalized Reset Threshold vs.
Temperature
http://onsemi.com
4
CAT853, CAT859, CAT863, CAT869
DETAILED DESCRIPTION
Reset Timing
The reset signal is asserted low for the CAT853, CAT863, CAT859, and CAT869 when the power supply voltage falls below
the threshold trip voltage and remains asserted for at least 140 ms after the power supply voltage has risen above the threshold.
Power
Supply
Voltage
Threshold
Voltage
Reset Timeout Period
140 ms
minimum
5V
0V
RESET
5V
0V
Figure 6. Reset Timing Diagram
V
CC
Transient Response
Valid Reset with V
CC
under 1.0 V
The CAT853, CAT863, CAT859, and CAT869 protect
mPs
against brownout failure. Short duration transients of 4
ms
or
less and 100 mV amplitude typically do not cause a false
RESET.
Figure 7 shows the maximum pulse duration of
negative−going V
CC
transients that do not cause a reset
condition. As the amplitude of the transient goes further
below the threshold (increasing V
TH
−
V
CC
), the maximum
pulse duration decreases. In this test, the V
CC
starts from an
initial voltage of 0.5 V above the threshold and drops below
it by the amplitude of the overdrive voltage (V
TH
−
V
CC
).
30
T
AMB
= 25°C
TRANSIENT DURATION (s)
25
20
15
10
“M” THRESHOLD
5
0
1
10
100
1000
“C” THRESHOLD
To ensure that the CAT859 and CAT869 RESET pin is in
a known state when V
CC
is under 1.0 V, a > 10 kW
pull−down resistor between RESET pin and GND is
recommended.
Power
Supply
V
CC
CAT8x9
RESET
GND
10 kW
Figure 8. RESET Valid with V
CC
Under 1.0 V
RESET OVERDRIVE V
TH
−
V
CC
(mV)
Figure 7. Maximum Transient Duration Without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
http://onsemi.com
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
