ON CAT853TTBI-G 3-pin microprocessor power supply supervisor Datasheet

CAT853, CAT863
CATCAT859, CAT869
3-Pin Microprocessor Power Supply Supervisors
FEATURES
DESCRIPTION
„ Precision monitoring of +3.3 V (-5%, -10%), 5 V
(-10% Power Supplies)
„ Active low reset output
„ Reset valid down to VCC = 1.0 V
„ 6 µA power supply current
„ Power supply transient immunity
„ Industrial temperature range: -40ºC to +85ºC
„ RoHS-compliant SOT-23 package
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.
¯¯¯¯¯¯ push-pull
The CAT859 and CAT869 feature a RESET
output (active low) for the two pinout options.
APPLICATIONS
„
„
„
„
„
„
„
„
„
The CAT853 and CAT863 feature an open drain
¯¯¯¯¯¯ output (active low). Both require a pull-up
RESET
resistor on the RESET output.
Computers
Servers
Laptops
Cable modems
Wireless communications
Embedded control systems
White goods
Power meters
Intelligent instruments
Fast transients on the power supply are ignored and
the output is guaranteed to be in the correct state at
VCC levels as low as 1.0 V.
For Ordering Information details, see page 9.
„ PDAs and handheld equipment
PIN CONFIGURATION
THRESHOLD SUFFIX SELECTOR
SOT-23 3-Lead
RESET
1
RESET
CAT853
CAT859
GND
SOT-23 3-Lead
3
1
CAT863
CAT869
VCC
VCC
2
3
GND
2
Nominal Threshold
Voltage
Threshold Suffix
Designation
4.38 V
M
4.20 V
F
3.08 V
T
2.93 V
S
2.4 V
C
PIN DESCRIPTION
Pin Name
¯¯¯¯¯¯
RESET
GND
VCC
Function
¯¯¯¯¯¯ is asserted if VCC falls below the reset threshold and remains low for at
Active low reset. RESET
least 140 ms after VCC rises above the reset threshold
Ground
Power supply voltage that is monitored
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3026, Rev. G
CAT853, CAT863, CAT859, CAT869
BLOCK DIAGRAMS
VCC
VCC
VCC
TOLERANCE
BIAS
+
RESET
DIGITAL
DELAY
–
VOLTAGE
REFERENCE
CAT853
CAT863
GND
VCC
VCC
VCC
TOLERANCE
BIAS
+
DIGITAL
DELAY
–
VOLTAGE
REFERENCE
RESET
CAT859
CAT869
GND
Doc. No. MD-3026, Rev. G
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
ABSOLUTE MAXIMUM RATINGS (1)
Parameters
Ratings
Units
-0.3 to +6.0
V
Input Current, VCC
20
mA
¯¯¯¯¯¯
Output Current, RESET
20
mA
Rate of Rise, VCC
100
V/µs
Continuous Power Dissipation
Derate 4mW/ºC above 70ºC (SOT23)
320
mW
Operating Temperature Range
-40 to +85
ºC
Storage Temperature Range
-65 to +105
ºC
300
ºC
Any pin with respect to ground
Lead Soldering Temperature (10 sec)
ELECTRICAL CHARACTERISTICS
VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 3.3 V for
the C, S, T versions, VCC = 5 V for the M version.
Symbol Parameter
VCC Range
ICC
Supply Current
Min
TA = 0ºC to +70ºC
1.0
5.5
TA = -40ºC to +85ºC
1.2
5.5
TA = -40ºC to +85ºC
M Threshold
F Threshold
VTH
Reset Threshold
Voltage
T Threshold
S Threshold
C Threshold
VCC < 3.6 V, C, S, T
TA = +25ºC
4.31
TA = -40ºC to +85ºC
4.25
TA = +25ºC
4.14
TA = -40ºC to +85ºC
4.08
TA = +25ºC
3.04
TA = -40ºC to +85ºC
3.00
TA = +25ºC
2.89
TA = -40ºC to +85ºC
2.85
TA = +25ºC
2.35
TA = -40ºC to +85ºC
2.30
Reset Threshold
Tempco
VCC to Reset
Delay
VCC = VTH to (VTH - 100 mV)
Reset Active
Timeout Period
TA = -40ºC to +85ºC
140
Typ
(2)
Conditions
Max
6
15
4.38
4.45
V
µA
4.50
4.20
4.26
4.31
3.08
3.11
3.15
2.93
V
2.96
3.00
2.40
2.45
2.50
30
ppm/ºC
20
µs
240
460
VOL
¯¯¯¯¯¯ Output
RESET
Voltage Low
VCC = VTH min, ISINK = 1.2 mA
0.4
VCC > 1.0 V, ISINK = 50 µA
0.3
VOH
¯¯¯¯¯¯ Output
RESET
Voltage High
VCC = VTH max, ISOURCE = -500 µA
(for CAT859/869 only)
0.8 VCC
Units
ms
V
V
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) Production testing done at TA = +25ºC; limits over temperature guaranteed by design only.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-3026, Rev. G
CAT853, CAT863, CAT859, CAT869
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 3.3 V for
the C, S, T versions, VCC = 5 V for the M version.
SUPPLY CURRENT VS. TEMPERATURE
(NO LOAD)
260
12
240
SUPPLY CURRENT (µA)
POWER-UP RESET TIMEOUT (ms)
POWER-UP RESET TIMEOUT
VS. TEMPERATURE
VCC = 5 V
220
200
VCC = 2.5 V
180
160
10
VCC = 5.5 V
8
6
VCC = 3.6 V
4
2
0
-50
0
50
100
150
-50
0
TEMPERATURE (°C)
150
NORMALIZED RESET THRESHOLD
VS. TEMPERATURE
1.0002
14
NORMALIZED THRESHOLD
POWER-DOWN RESET DELAY (µs)
100
TEMPERATURE (°C)
POWER-DOWN RESET DELAY
VS. TEMPERATURE
12
10
8
6
4
2
0
1
0.9998
0.9996
0.9994
0.9992
0.999
0.9988
-50
0
50
100
150
0
TEMPERATURE (°C)
Doc. No. MD-3026 Rev. G
50
20
40
60
80
100 120
TEMPERATURE (°C)
4
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT853, CAT863, CAT859, 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.
Threshold
Voltage
Power 5 V
Supply
Voltage 0 V
RESET
Reset Timeout Period
140 ms
minimum
5V
0V
Figure 1. Reset Timing Diagram
VCC TRANSIENT RESPONSE
The CAT853, CAT863, CAT859, and CAT869 protect
µPs against brownout failure. Short duration
transients of 4 µs or less and 100 mV amplitude
typically do not cause a false RESET.
reset condition. As the amplitude of the transient goes
further below the threshold (increasing VTH - VCC), the
maximum pulse duration decreases. In this test, the
VCC starts from an initial voltage of 0.5 V above the
threshold and drops below it by the amplitude of the
overdrive voltage (VTH - VCC).
TRANSIENT DURATION [s]
Figure 2 shows the maximum pulse duration of
negative-going VCC transients that do not cause a
TAMB = 25ºC
“C” THRESHOLD
“M” THRESHOLD
RESET OVERDRIVE V TH - VCC [mV]
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-3026, Rev. G
CAT853, CAT863, CAT859, CAT869
VALID RESET WITH VCC UNDER 1.0 V
¯¯¯¯¯¯ pin
To ensure that the CAT859 and CAT869 RESET
is in a known state when VCC is under 1.0 V, a > 10 kΩ
¯¯¯¯¯¯ pin and GND is
pull-down resistor between RESET
recommended.
Power
Supply
VCC
CAT8x9
RESET
GND
¯¯¯¯¯¯ Valid with VCC Under 1.0 V
Figure 3. RESET
BI-DIRECTIONAL RESET PIN INTERFACING
The CAT859 and CAT869 can interface with µP/µC
bi-directional reset pins by connecting a 4.7 kΩ
resistor in series with the CAT859 and CAT869 reset
output and the µP/µC bi-directional reset pin.
BUF
Power
Supply
Buffered
RESET
VCC
VCC
CAT8x9
µP
RESET
INPUT
RESET
GND
Bi-directional
(For example:
68HC11)
GND
I/O Pin
Figure 4. Bi-directional Reset Pin Interfacing
Doc. No. MD-3026 Rev. G
6
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
¯¯¯¯¯¯
CAT853 AND CAT863 OPEN-DRAIN RESET
APPLICATION
The CAT853 and CAT863 features an open-drain
RESET output and therefore need a pull-up resistor
on the output for proper operation, as shown on
Figure 5. An advantage of the open-drain output
includes the ability to “wire AND” several outputs
together to form an inexpensive logic circuit. It is also
possible to have the pull-up resistor connected to a
different supply which can be higher than the CAT8x3
VCC pin. The value of the pull-up resistor is not critical
in most applications, typical values being between
5 kΩ and 10 kΩ.
Power
Supply
VCC
5kΩ
VCC
CAT8x3
µP
RESET
RESET
INPUT
GND
GND
Figure 5. Typical CAT8x3 Open-Drain Circuit Configuration
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-3026, Rev. G
CAT853, CAT863, CAT859, CAT869
PACKAGE OUTLINE DRAWING
SOT-23 3-LEAD (TB)
(1)(2)
SYMBOL
D
3
E1
1
E
2
e
MIN
NOM
MAX
A
0.89
1.12
A1
0.013
0.10
b
0.37
0.50
c
0.085
0.18
D
2.80
3.04
E
2.10
2.64
E1
1.20
1.40
e
0.95 BSC
e1
1.90 BSC
L
0.400 REF
e1
L1
0.540 REF
TOP VIEW
θ
A
0º
8º
θ
b
L1
A1
SIDE VIEW
L
c
END VIEW
Notes:
(1) All dimensions in millimeters. Angles in degrees.
(2) Complies with JEDEC standard TO-236.
Doc. No. MD-3026 Rev. G
8
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
EXAMPLE OF ORDERING INFORMATION
Prefix
Device #
CAT
(1) (2) (3)
Suffix
859
S
Company ID
Device Type
853: Open Drain / Active Low Output
863: Open Drain / Active Low Output
859: Push-Pull / Active Low Output
869: Push-Pull / Active Low Output
TB
Threshold Level
M: 4.38 V
F: 4.20 V
T: 3.08 V
S: 2.93 V
C: 2.40 V
I
-G
T10
Lead Finish
G:NiPdAu
Temperature Range
I = Industrial (-40ºC to 85ºC)
Tape & Reel
T: Tape & Reel
3: 3,000/Reel
10: 10,000/Reel
Package
TB: SOT-23 (1)
TOP MARKING
Part and Threshold
CAT859C
CAT859T
CAT859S
CAT859F
CAT859M
CAT869T
CAT869S
CAT869M
SOT-23 RoHS
(4) (5)
NiPdAu Finish
Part and Threshold
CAT853C
CAT853T
CAT853S
CAT853F
CAT853M
CAT863T
CAT863S
CAT863M
RSYM
RTYM
SOT-23 RoHS
(4) (5)
NiPdAu Finish
RUYM
RVYM
ORDERING PART NUMBER (6)
CAT859CTBI-G
CAT859TTBI-G
CAT859STBI-G
CAT859FTBI-G
CAT859MTBI-G
CAT869TTBI-G
CAT869STBI-G
CAT869MTBI-G
CAT853CTBI-G
CAT853TTBI-G
CAT853STBI-G
CAT853FTBI-G
CAT853MTBI-G
CAT863TTBI-G
CAT863STBI-G
CAT863MTBI-G
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The device used in the example above is a CAT859STBI-GT10 (Push-Pull / Active Low Output, trip level of 2.85 V to 3.00 V NiPdAu,
Tape and Reel).
(3) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
(4) The “YM” in the SOT-23 package marking indicates the Year and Month of production.
(5) All NiPdAu devices will be marked to indicate product type. Threshold and full part numbers will be provided on box and reel labels as well
as all Shipping documents.
(6) For special threshold and package options, contact factory.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-3026, Rev. G
CAT853, CAT863, CAT859, CAT869
REVISION HISTORY
Date
Rev.
Description
11-Oct-06
A
Initial Issue CAT859, CAT869
04-May-07
B
Added CAT853, CAT863
Update Example of Ordering Information
Update Top Marking
Update Ordering Part Number
17-Jan-07
C
Add Threshold Level - C: 2.40 V
Update Package Outline Drawing
Add MD- to document number
30-Jan-08
D
Added Block Diagrams
05-Nov-08
E
Change logo and fine print to ON Semiconductor
04-Mar-09
F
Convert to MS Word format
08-Apr-09
G
Add Nominal Threshold Voltage 4.20 “F”
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Doc. No. MD-3026 Rev. G
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Characteristics subject to change without notice
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