ON CAT884 Quad voltage supervisor Datasheet

CAT884
Quad Voltage Supervisor
Description
The CAT884 is a four−channel power supply supervisory circuit
with high accuracy reset thresholds and very low power consumption.
The device features an active−low open−drain output with manual
reset to perform basic system reset and voltage monitoring functions
for a wide range of electronic products.
CAT884 monitors four system voltages maintaining its reset output
active until all the power supply voltages exceed the specified
threshold values. The four threshold voltages are user controlled and
can be set for system specific requirements over a range of 0.635 V to
5.5 V using external resistor dividers.
The CAT884 lowers system costs and saves board space by
integrating four channels into a single, small SOIC 8−lead package
and operates over the industrial temperature range of −40°C to +85°C.
Features
•
•
•
•
•
•
•
Quad Voltage Monitoring
Adjustable Threshold Voltages down to 0.635 V with ±2% Accuracy
Low Supply Current: 3 mA (typ)
RESET Valid to VCC = 1 V
Immune to Short Supply Transients
Operating Temperature Range: −40°C to +85°C
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
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SOIC−8
V SUFFIX
CASE 751BD
PIN CONNECTIONS
VDD
1
RESET
V2
MR
V3
GND
MARKING DIAGRAM
884VYM
• Monitoring of Multiple Power Supply Voltages in mP Based Systems
V+
V1
VDD
V2
RESET
V3
MR
V4
GND
884V = Device Code
Y = Production Year (Last Digit)
M = Production Month: 1−9, A, B, C
Optional
mP
Reset
ORDERING INFORMATION
Manual
Reset
Device
CAT884RVI−GT3
October, 2010 − Rev. 0
Package
Shipping†
SOIC−8
(Pb−Free)
3,000/
Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2010
V4
(Top View)
Applications
S1 S2 S3 S4
V1
1
Publication Order Number:
CAT884/D
CAT884
30 ms
Filter
V1
−
VDD
POR
+
0.635 V +
−
30 ms
Filter
V2
−
+
RESET
0.635 V +
−
30 ms
Filter
V3
V+
−
+
MR
0.635 V +
−
30 ms
Filter
V4
−
+
GND
0.635 V +
−
Figure 2. CAT884 Block Diagram
Table 1. PIN FUNCTION
Pin Number
Pin Name
1
VDD
Function
2
RESET
3
MR
4
GND
5
V4
Fourth adjustable under−voltage detector input
6
V3
Third adjustable under−voltage detector input
7
V2
Second adjustable under−voltage detector input
8
V1
First adjustable under−voltage detector input
Chip power supply
Open Drain active LOW reset output
Manual Reset
Ground
Table 2. ABSOLUTE MAXIMUM RATINGS
Rating
Value
Unit
−0.3 to +6.0
V
20
mA
Operating Temperature Range
−40 to +85
°C
Storage Temperature Range
−65 to +150
°C
Junction Temperature
+150
°C
Lead Temperature (soldering, 10 s)
+300
°C
VDD, V1−V4, MR, RESET to GND
Continuous RESET Current
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.
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2
CAT884
Table 3. ELECTRICAL CHARACTERISTICS
(VDD = 1.0 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.0 V to 3.3 V, TA = +25°C. (Note 1))
Symbol
Parameter
Test Conditions
Min
Typ
VDD
Operating Voltage
IDD
Supply Current
VDD = 5 V
VDD Input Voltage Threshold
VDD low ³ High
2.6
VDD High ³ Low
2.4
VPOR_
1.5
3
Max
Units
5.5
V
9
mA
V
RESET OUTPUT
VOL
RIN
TCVTH
tRPD
RESET Output Low
VCC ≥ 5 V, ISINK = 2.5 mA
0.05
0.4
VCC < 3.3 V, ISINK = 1.5 mA
0.05
0.4
V
Internal Pull−Up Resistor
20
kW
Reset Threshold Temperature
Coefficient
60
ppm/°C
1
1.5
ms
0.619
0.635
Delay; VIN to Reset
VIN falling at 10 mV/ms from VTH to
(VTH – 50 mV)
VOLTAGE THRESHOLD
VTH
Adjustable Threshold
Monitored voltage decreasing
Reset Threshold Hysteresis
Monitored voltage increasing compared
to monitored voltage decreasing
10
mV
Variance of VTH voltages
VTH (max) − VTH (min) (Note 4)
1.8
mV
tFIL
Glitch Filter Delay
VMON glitch to RST low Filter
30
ms
tRD
Delay; VMON to Reset
VMON falling at 10 mV/ms from VTH to
(VTH – 50 mV)
2
ms
VHYST
VTH_VAR
1
0.651
V
MANUAL RESET INPUT
1.
2.
3.
4.
VTHL
MR Input Voltage Low
VTHH
MR Input Voltage High
0.8
V
VDD −
0.6
V
20
ns
TPW
MR Minimum Pulse Width
IPU
Pull−Up Current
10
mA
tMD
MR to Deassert Reset output
delay
40
ns
tMR
MR to Assert Reset output
delay
30
ns
100% production tested at TA = +25°C. Limits over temperature guaranteed by design.
The devices are powered from VDD.
The RESET output is guaranteed to be in the correct state for VDD down to 1 V.
Not tested in production but guaranteed by design.
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CAT884
TYPICAL CHARACTERISTICS
(VDD = 3.0 V, TA = +25°C, unless specified otherwise.)
3.15
2480
2440
3.05
3.00
VTH (mV)
IDD (mA)
3.10
T = 25°C
2360
2.95
2.90
2400
2.5
3.5
4.5
5.5
2320
−40
6.5
25
90
VDD (V)
TEMPERATURE (°C)
Figure 3. IDD Input Current vs. Temperature
Figure 4. VDD Input Voltage Threshold
(High to Low)
640
32
T = 25°C
VTH DN
31
T_FIL (mS)
VTH (mV)
638
636
634
29
632
630
−40
30
25
28
90
1.5
2.5
3.5
4.5
5.5
TEMPERATURE (°C)
VDD (V)
Figure 5. Monitored Voltages Decreasing
Figure 6. Glitch Filter Delay for Voltage
Monitors
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6.5
CAT884
Detailed Description
The CAT884 is a space−saving, low−power, quad voltage
microprocessor supervisory circuit designed monitor 4
voltage supplies.
Applications Information
3.3 V
Reset Output
CAT884 provides an active LOW system reset signal via
an open drain output which requires an external pull−up
resistor to an external power supply. This supply can be less
than or greater than VDD, but should not exceed 5.5 V. When
the external pull−up voltage is greater than VDD reverse
current flow from the external pull−up voltage to VDD is
prevented by CAT884’s internal circuitry.
VDD is also a monitored voltage in CAT884 with
thresholds set for 2.6 V rising and 2.4 V falling. When any
monitored supply drops below its threshold, the reset output
asserts LOW and remains LOW as long as VDD is above
1.0 V.
VDD
CAT884
V1
VDD
mP
V2
RESET
RESET
V3
V4
Figure 7. Interfacing to Different Logic−Supply
Voltage
VPOR
1V
0
VMON
VTH
<tFIL
0
>TPW
MR
0
tRPD
tFIL
5V
tRD
tMD
RST
0
tMR
Figure 8. Operational Timing Diagram
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CAT884
Adjustable Thresholds
POR
CAT884 allows users to create 4 custom voltage
thresholds. The threshold voltage at each adjustable input is
typically 0.635 V. Monitoring of voltages greater than
0.635 V requires a resistor−divider network to be connected
to the circuit (Figure 9).
Applying power to the CAT884 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 and FPGA’s have
downloaded their configuration data. The reset signal
remains active until all monitored power supplies have risen
above their minimum preset voltage levels.
V IN + 0.635 V
or, written in terms of R1:
ǒǒ
R1 + R2
(R1 ) R2)
R2
Ǔ Ǔ
V IN
*1
0.635 V
Power−Supply Bypassing
While not required for proper operation it is good practice
to bypass CAT884’s power supply with a 0.1 mF capacitor
placed close to the VDD pin.
Because the CAT884 has a guaranteed input current of less
than 50 nA on the monitoring inputs, resistor values up to
1,000 kW can be used for R2 with < 1% error.
Each of the 4 monitor inputs is also equipped with a glitch
canceling circuit which filters out noise spikes and transients
30 ms or shorter in duration. For applications where greater
noise immunity is required, connect a capacitor between
each input pin and ground (in parallel with R2), placing the
capacitor and resistor very close to CAT884’s package.
VIN
CAT884
R1
−
R2
Unused Inputs
Connect any unused monitor inputs to a supply voltage
greater in magnitude than their specified threshold voltages;
use VDD for normal operation (device power−supply pin).
Do not connect unused monitor inputs to ground or allow
them to float.
+
VREF
+
−
Figure 9. Setting Monitor Voltage
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CAT884
PACKAGE DIMENSIONS
SOIC 8, 150 mils
CASE 751BD−01
ISSUE O
SYMBOL
E1
E
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
b
0.33
0.51
c
0.19
0.25
D
4.80
5.00
E
5.80
6.20
E1
3.80
4.00
e
PIN # 1
IDENTIFICATION
NOM
1.27 BSC
h
0.25
0.50
L
0.40
1.27
θ
0º
8º
TOP VIEW
D
h
A1
θ
A
c
e
b
L
END VIEW
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MS-012.
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CAT884
Example of Ordering Information (Note 7)
Prefix
Device #
Suffix
CAT
884
R
V
Company ID
(Optional)
Product Number
884
Trip Level
R: 2.6
Package
V: SOIC
−G
T3
Lead Finish
G: NiPdAu
Tape & Reel (Note 8)
T: Tape & Reel
3: 3,000 / Reel
I
Temperature Range
I = Industrial (−40°C to +85°C)
5.
6.
7.
8.
All packages are RoHS−compliant (Lead−free, Halogen−free).
The standard plated finish is NiPdAu.
The device used in the above example is a CAT884RVI−GT3 (Trip Level, SOIC, Industrial Temperature, NiPdAu, Tape & Reel, 3,000/Reel).
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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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For additional information, please contact your local
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CAT884/D