CAT885 D

CAT885
Five-Channel Power Supply Supervisors
FEATURES
DESCRIPTION
„ Five-channel supply voltage detection
„ 2 VDD inputs allow monitoring of
+5.0V, +3.3V, +3.0V, +2.5V or +1.8V supplies
„ 3 adjustable voltage inputs allow monitoring
supplies > 0.6V
„ 70ms minimum reset delay
„ Manual reset capability
„ Reset signals valid down to VDD = 1V
„ Accurate ± < 2% voltage threshold
„ Power-supply transients suppressed
„ Low 2µA maximum supply current at 5V
„ RoHS-compliant MSOP package
The CAT885 is a five-channel power supply
supervisory circuit with high reset thereshold accuracy
and very low power consumption. The device features
an open-drain output, active-low function with manual
reset to perform basic system reset and monitoring
functions for a wide range of electronic products. The
CAT885 monitors five system voltages by maintaining a
reset output active until all the power supply voltages
exceed the specified trip values. The device then
maintains the reset output in an active condition until
the internal timer times out, which allows the system
power supplies to stabilize.
Two of the five voltage detectors are factory set for
standard supplies, while the threshold voltages of the
third, fourth, and fifth voltage monitors can be adjusted
for specific system design requirements using external
resistors.
APPLICATIONS
„
„
„
„
„
Telecom & datacom systems
Routers & servers
Data storage equipment
Set-top boxes
Multi-voltage systems
The CAT885 lowers system costs and saves board
space by integrating five channels into a single, small
MSOP 8-lead package.
For Ordering Information details see page 7.
PIN CONFIGURATION
TYPICAL APPLICATION
MSOP 8-Lead (Z)
VDD
VDD2
V3MON
(top view)
¯¯¯
MR
1
VDD
2
VDD2
3
VSS
4
8 ¯¯¯¯
RST
CAT885
RST
7 V5MON
CAT885
6 V4MON
V4MON
5 V3MON
MR
See page 2 for pin functions
V5MON
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
Reset
Signal
1
PB
VSS
Doc. No. MD-3028 Rev. C
CAT885
FUNCTIONAL BLOCK DIAGRAM
VDD
VDD
MR
POR
PB
VREF
VDD2
VDD
RST
VREF
120 ms
TIME-OUT
V3MON
Reset
Signal
V4MON
VREF
VREF
V5MON
VSS
VREF
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
Pin
¯¯¯
MR
VDD
VDD2
VSS
V3MON
V4MON
V5MON
¯¯¯¯
RST
Doc. No. MD-3028 Rev. C
Function
Active-low manual reset Input with internal pull-up resistor
Chip supply, first preset under-voltage detector input
Second preset under-voltage detector input
Ground
Adjustable third under-voltage detector input
Adjustable fourth under-voltage detector input
Adjustable fifth under-voltage detector input
Active-low open drain reset output, use external resistor
2
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT885
ABSOLUTE MAXIMUM RATINGS (1)
Parameters
Ratings
Units
Temperature under Bias
-40 to +125
ºC
Voltage on any Pin with Respect to VSS
-1.0 to +7.0
V
5
mA
145
°C/W
Ratings
Units
Operating Temperature Range (Industrial)
-40 to +85
ºC
Storage Temperature
-65 to +150
ºC
+300
ºC
DC Output Current
Thermal Resistance ӨJA for MSOP Package
(2)
RECOMMENDED OPERATING CONDITIONS
Parameters
Lead Soldering Temperature (10 seconds)
ELECTRICAL CHARACTERISTICS
Over the recommended operating conditions unless otherwise specified.
Symbol
VDD
IDD1
IDD2
IDDX
Parameter
Supply Voltage Range
VDD Supply Current
VDD2 Input Current
V3, V4, V5MON Input Current
Conditions
Min
1.5
VDD = 5.0V
VDD2 = 3.3V
V3, V4, V5MON = 1.0V
Typ.
2
0.5
15
Max
5.5
9
3
50
Units
V
µA
µA
nA
4.72
2.92
Voltage Thresholds
VTH1
VTH1HYST
VTH2
VTH2HYST
VREF
VREFHYST
Fixed Voltage Trip Point for VDD
Hysteresis of VTH1
Fixed Voltage Trip Point for VDD2
Hysteresis of VTH2
V3MON, V4MON, V5MON Adj.
Reset Threshold Voltage
CAT885Lx
CAT885Sx
VTH1 = 4.63V
VTH1 = 2.87V
CAT885xT
CAT885xS
CAT885xZ
CAT885xA
VTH2 = 3.08V
VTH2 = 2.95V
VTH2 = 2.33V
VTH2 = 1.68V
4.55
2.81
3.02
2.90
2.29
1.65
4.63
2.87
50
30
3.08
2.95
2.33
1.68
40
30
25
20
3.13
3.01
2.37
1.71
V
V
mV
mV
V
V
V
V
mV
mV
mV
mV
VTH for V3, V4, V5MON
0.585
0.598
0.611
V
Hysteresis Voltage
3
mV
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 devices 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)
θJA is measured with the component mounted on a high effective thermal conductivity test board in free air.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-3028 Rev. C
CAT885
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Conditions
Min
Reset Output Voltage Low
VDD ≥ 3.3V, Sinking 2.5mA
VDD < 3.3V, Sinking 1.5mA
Typ.
Max
Units
0.05
0.05
6
120
5
0.40
0.40
V
V
µs
ms
pF
Reset
VOL
tRPD
tPD
CLOAD
VTH to Reset Asserted Delay
POR Timeout Delay
Load Capacitance on Reset Pin
1
70
Manual Reset
¯¯¯
VTHL
MR Input Voltage Low
¯¯¯
VTHH
MR Input Voltage High
¯¯¯
TPW
MR Minimum Pulse Width
RIN
Internal Pull-Up Resistor
240
0.8
VDD - 0.6
1
8
16
V
V
µs
kΩ
OPERATION
CAT885 allows users to adjust the minimum voltage
sense level for three of the five monitored voltages.
For example, the user can adjust the voltage input trip
point for V3MON, V4MON and V5MON inputs. This is done
by connecting an external resistor divider network to
the VxMON pin in order to set the trip point to a voltage
above 600mV. Resistors R1 and R2 in Figure 1 are
selected by the formula: VTRIP = 0.6V x (R1 + R2) / R2.
The CAT885 is designed to monitor critical supply
voltages in line driven and battery powered
microprocessor systems, providing Supply Voltage
Supervision, Power On Reset control and Manual
Reset Assertion. These features along with excellent
threshold accuracy and low power consumption make
the CAT885 device suitable for a wide variety of
applications needing multi-voltage monitoring.
During normal operation, the CAT885 monitors the
voltage levels of VDD, V2MON, V3MON, V4MON, and
V5MON. If the voltage on any of these five inputs falls
below their respective voltage trip points, a reset is
¯¯¯¯ = low) to prevent the microprocessor
asserted (RST
from operating during a power failure or brownout
condition. This reset signal remains low until the
voltages exceeds the voltage threshold settings for
the reset time delay period tPD.
VDD
V2MON
CAT885
R1
VxMON
R2
GND
Figure 1. CAT885 Programming Trip Voltage
Doc. No. MD-3028 Rev. C
4
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT885
POWER ON RESET (POR)
MANUAL RESET
Applying power to the CAT885 activates a POR circuit
which activates the reset output (active LOW). At
power-up POR prevents the system microprocessor
from starting to operate with insufficient voltage and
prior to stabilization of the clock oscillator. It ensures
that operation is precluded until internal registers are
properly loaded, FPGA’s have downloaded their
configuration data prior and all system power supplies
are above minimum operating levels and stable. The
reset signal remains active until VDD rises above the
minimum preset voltage level for time period tPD.
¯¯¯) allows the user to trigger
The manual-reset input (MR
a reset by using a push-button switch or by
electronically driving the input low. The ¯¯¯
MR input is an
active LOW debounced input. Reset is asserted
anytime the ¯¯¯
MR pin is pulled low to less than 100mV
for the minimum ¯¯¯
MR pulse width or longer. The reset
output remains asserted low for tPD , typically 120ms
and then is released. Figures 2 and 3 illustrate the
CAT885’s operation and ¯¯¯¯
RST output response times.
VDD/
VDD2
VTH1/2
1V
0
>TPW
MR
0
tPD
tRPD
tPD
tPD
RST
0
tRPD
Figure 2. Power Supply Monitoring Diagram
VMON
VTH
0
tRPD
tPD
RST
0
Figure 3. Auxillary Voltage Monitoring Diagram
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-3028 Rev. C
CAT885
PACKAGE OUTLINE DRAWING
MSOP 8-Lead 3 x 3mm (Z)
(1)(2)
SYMBOL
MIN
NOM
MAX
A
E
E1
1.10
A1
0.05
0.10
0.15
A2
0.75
0.85
0.95
b
0.22
c
0.13
D
2.90
0.38
0.23
3.00
3.10
E
4.80
4.90
5.00
E1
2.90
3.00
3.10
e
L
0.65 BSC
0.40
0.60
L1
L2
θ
0.80
0.95 REF
0.25 BSC
0º
6º
TOP VIEW
D
A
A2
A1
DETAIL A
e
b
c
SIDE VIEW
END VIEW
θ
L2
L
L1
DETAIL A
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-187.
Doc. No. MD-3028 Rev. C
6
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT885
EXAMPLE OF ORDERING INFORMATION (1)
Prefix
CAT
Device # Suffix
885
Z
I
Package
Z: MSOP
Voltage
Detection
VDD Level
S = 2.87V
L = 4.63V
Company ID
Product Number
885
-L
Temperature Range
I = Industrial (-40ºC to 85ºC)
S
Voltage
Detection
VDD2 Level
T = 3.08V
S = 2.95V
Z = 2.33V
A = 1.68V
-G
T3
Tape & Reel
T: Tape & Reel
3: 3,000/Reel
Lead Finish
G:NiPdAu
ORDERING INFORMATION
Part Number
VDD
VDD2
Package
CAT885ZI-ST-GT3
2.87V
3.08V
MSOP
CAT885ZI-SS-GT3
2.87V
2.95V
MSOP
CAT885ZI-SZ-GT3
2.87V
2.33V
MSOP
CAT885ZI-SA-GT3
2.87V
1.68V
MSOP
CAT885ZI-LT-GT3
4.63V
3.08V
MSOP
CAT885ZI-LS-GT3
4.63V
2.95V
MSOP
CAT885ZI-LZ-GT3
4.63V
2.33V
MSOP
CAT885ZI-LA-GT3
4.63V
1.68V
MSOP
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard finish is NiPdAu.
(3) The device used in the above example is a CAT885ZI-LS-GT3 (MSOP, Industrial Temperature, 4.63V (VDD) and 2.95V (VDD2) Detection
Levels, NiPdAu, Tape & Reel, 3,000/Reel).
(4) For additional detection voltage, package and temperature options, please contact your nearest ON Semiconductor Sales office.
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-3028 Rev. C
CAT885
REVISION HISTORY
Date
Rev.
Description
05-May-08
A
Initial Release
06-Nov-08
B
Change logo and fine print to ON Semiconductor
03-Aug-09
C
Update Functional Block Diagram
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arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights
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PUBLICATION ORDERING INFORMATION
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Doc. No. MD-3028 Rev. C
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For additional information, please contact your local
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© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
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