Catalyst CAT859MTBI-G 3-pin microprocessor power supply supervisor Datasheet

CAT853, CAT863
CAT859, CAT869
3-Pin Microprocessor Power Supply
Supervisors
FEATURES
DESCRIPTION
■
Precision monitoring of +3.3V (-5%, -10%), 5V
(-10% Power Supplies)
■
Active low reset output
■
Reset valid down to VCC = 1.0V
■
6μA 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 +3.3V or 5.0V systems.
The CAT859 and CAT869 feature a RESET push-pull
output (active low) for the two pinout options.
APPLICATIONS
The CAT853 and CAT863 feature an open drain RESET
output (active low). Both require a pull-up resistor on
the RESET output.
■
Computers
■
Servers
■
Laptops
■
Cable modems
■
Wireless communications
■
Embedded control systems
■
White goods
■
Power meters
■
Intelligent instruments
■
PDAs and handheld equipment
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 1.0V.
For Ordering Information details, see page 8.
PIN CONFIGURATION
THRESHOLD SUFFIX SELECTOR
3-Lead SOT23
RESET
1
RESET
CAT853
CAT859
GND
3-Lead SOT23
3
1
CAT863
CAT869
VCC
2
VCC
3
GND
2
Nominal Threshold
Voltage
Threshold Suffix
Designation
3.08V
T
2.93V
S
4.38V
M
PIN DESCRIPTIONS
Name
Description
RESET Active low reset. RESET is asserted if VCC falls below the reset threshold and remains low for at least
140ms after VCC rises above the reset threshold.
GND
Ground
VCC
Power supply voltage that is monitored.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 3026, Rev. B
CAT853, CAT863, CAT859, CAT869
ABSOLUTE MAXIMUM RATINGS(1)
Any pin with respect to ground
-0.3V to +6.0V
Input Current, VCC
20mA
Output Current, RESET
20mA
Rate of Rise, VCC
100V/μs
Continuous Power Dissipation
Derate 4mW/ºC above 70ºC (SOT23)
320 mW
Operating Temperature Range
-40ºC to +85ºC
Storage Temperature Range
-65ºC to +105ºC
Lead Soldering Temperature (10 sec)
300ºC
Note:
(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.
ELECTRICAL CHARACTERISTICS
VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC and VCC = 3.3V for the
T/S versions, VCC = 5V for the M version.
Parameter
Symbol
VCC Range
Supply Current
ICC
Reset
Threshold
Voltage
VTH
Min
Max
Units
TA = 0ºC to +70ºC
1.0
5.5
V
TA = -40ºC to +85ºC
1.2
5.5
TA = -40ºC to +85ºC
T Threshold
S Threshold
M Threshold
VCC < 3.6V, S/T
TA = +25ºC
3.04
TA = -40ºC to +85ºC
3.00
TA = +25ºC
2.89
TA = -40ºC to +85ºC
2.85
TA = +25ºC
4.31
TA = -40ºC to +85ºC
4.25
Reset
Threshold
Tempco
VCC to Reset
Delay
VCC = VTH to (VTH - 100 mV)
Reset Active
Timeout Period
TA = -40ºC to +85ºC
RESET Output
Voltage Low
VOL
RESET Output
Voltage High
VOH
Typ(1)
Conditions
140
6
15
μA
3.08
3.11
V
3.15
2.93
2.96
3.00
4.38
4.45
4.50
30
ppm/ºC
20
μs
240
460
VCC = VTH min, ISINK = 1.2mA
0.4
VCC > 1.0V, ISINK = 50μA
0.3
VCC = VTH max, ISOURCE = -500μA
(for CAT859/869 only)
0.8 VCC
ms
V
V
Note:
(1) Production testing done at TA = +25ºC; limits over temperature guaranteed by design only.
Doc. No. 3026, Rev. B
2
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
TYPICAL OPERATING CHARACTERISTICS
VCC = Full range, TA = -40ºC to +85ºC unless otherwise noted. Typical values at TA = +25ºC, VCC=3.3V for T/S versions,
and VCC = 5V 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=5V
220
200
VCC=2.5V
180
160
10
VCC=5.5V
8
VCC=3.6V
6
4
2
0
-50
0
50
100
150
-50
0
POWER-DOWN RESET DELAY
VS. TEMPERATURE
150
NORMALIZED RESET THRESHOLD
VS. TEMPERATURE
14
12
10
8
6
4
2
0
-50
100
TEMPERATURE (°C)
NORMALIZED THRESHOLD
POWER-DOWN RESET DELAY (μS)
TEMPERATURE (°C)
50
1.0002
1
0.9998
0.9996
0.9994
0.9992
0.999
0.9988
0
50
100
150
0
TEMPERATURE (°C)
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
20
40
60
80
100
120
TEMPERATURE (°C)
3
Doc No. 3026, Rev. B
CAT853, CAT863, CAT859, CAT869
DETAILED DESCRIPTIONS
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 140ms after the power supply voltage has
risen above the threshold.
Threshold
Voltage
Power 5V
Supply
Voltage 0V
RESET
Reset Timeout Period
140ms
minimum
5V
0V
Figure 1. Reset Timing Diagram
VCC TRANSIENT RESPONSE
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 0.5V above the threshold and
drops below it by the amplitude of the overdrive voltage
(VTH - VCC).
The CAT853, CAT863, CAT859, and CAT869 protect
μPs against brownout failure. Short duration transients
of 4μsec or less and 100mV amplitude typically do not
cause a false RESET.
Figure 2 shows the maximum pulse duration of negativegoing VCC transients that do not cause a reset condition.
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
Doc. No. 3026, Rev. B
4
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
VALID RESET WITH VCC UNDER 1.0V
To ensure that the CAT859 and CAT869 RESET pin
is in a known state when VCC is under 1.0V, a >10kΩ
pull-down resistor between RESET pin and GND is
recommended.
Power
Supply
VCC
CAT8x9
RESET
GND
Figure 3. RESET Valid with VCC Under 1.0V
BI-DIRECTIONAL RESET PIN INTERFACING
The CAT859 and CAT869 can interface with μP/μC
bi-directional reset pins by connecting a 4.7kΩ 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
I/O Pin
(For example:
68HC11)
GND
Figure 4. Bi-directional Reset Pin Interfacing
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc No. 3026, Rev. B
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 5kΩ and 10kΩ.
Power
Supply
VCC
5kΩ
VCC
CAT8x3
µP
RESET
RESET
INPUT
GND
GND
Figure 5. Typical CAT8x3 Open-Drain Circuit Configuration
Doc. No. 3026, Rev. B
6
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
PACKAGE INFORMATION
Plastic SOT-23 (3-Pin)
B
E
H
e
e1
D
E
c
A
ө
A1
L1
Inches
Min
L
Millimeters
Max
Min
Max
Plastic SOT-23 (3-Pin)
A
0.0350
0.0441
0.89
1.12
A1
0.0005
0.0039
0.013
0.10
B
0.0146
0.0197
0.37
0.50
c
0.0033
0.0071
0.085
0.18
D
0.1102
0.1197
2.80
3.04
E
0.0472
0.0551
1.20
1.40
e
0.0350
0.0406
0.89
1.03
e1
0.0701
0.0807
1.78
2.05
H
0.0827
0.1039
2.10
2.64
ө
0º
8º
0º
8º
L
0.0083
0.0161
0.275
0.41
L1
0.0160
0.0270
0.275
0.685
For current Tape and Reel information,
download the PDF file from:
www.catsemi.com/documents/tapeandreel.pdf
Notes:
(1) This part is compliant with JEDEC specification TO-236
(2) Die is face up for mold and trim/form
(3) Dimensions are exclusive of mold flash and metal burr
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc No. 3026, Rev. B
CAT853, CAT863, CAT859, CAT869
EXAMPLE OF ORDERING INFORMATION (1) (2) (3)
Prefix
Device #
CAT
859
Suffix
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
TBI
Threshold Level
T: 3.08V
S: 2.93V
M: 4.38V
–
T10
G
Lead Finish
G: NiPdAu (PPF)
Package Type
TBI: SOT-23 Green(1)
T: Tape & Reel
3: 3000/Reel
10: 10000/Reel
TOP MARKING
Part and Threshold
SOT-23 RoHS
NiPdAu Finish(4) (5)
Part and Threshold
CAT859T
CAT859S
CAT853T
RSYM
CAT853S
CAT859M
CAT853M
CAT869T
CAT863T
CAT869S
SOT-23 RoHS
NiPdAu Finish(4) (5)
RTYM
CAT863S
CAT869M
RUYM
RVYM
CAT863M
ORDERING PART NUMBER
CAT859TTBI-G
CAT859STBI-G
CAT859MTBI-G(6)
CAT869TTBI-G
CAT869STBI-G
CAT869MTBI-G(6)
CAT853TTBI-G
CAT853STBI-G(6)
CAT853MTBI-G
CAT863TTBI-G
CAT863STBI-G(6)
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 2.85V to 3.00V NiPdAu, Tape
and Reel).
(3) For additional package and temperature options, please contact your nearest Catalyst 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 categories, contact factory.
Doc. No. 3026, Rev. B
8
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
10/11/2006
05/04/2007
Rev.
Reason
A
Initial Issue CAT859, CAT869
B
Added CAT853, CAT863
Update Example of Ordering Information
Update Top Marking
Update Ordering Part Number
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Document No: 3026
Revision:
B
Issue date:
05/04/07
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