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PDF CAT706 Data sheet ( Hoja de datos )

Número de pieza CAT706
Descripción (CAT705 - CAT813) uP Supervisory Circuits
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µP Supervisory Circuits
CAT705, CAT706, CAT813
FEATURES
n Reset guaranteed valid for 1.0 V VCC
n 6µA supply current
n 200ms Reset pulse width
n Watchdog timer function 1.6s timeout
n Accurate brownout detection reset in 3.0, 3.6,
and 5.0 volt systems
n Secondary low supply monitoring on PFI input
n Pin and function compatible with the
MAX705/MAX706/MAX813L products
n Operating Range from -40°C to +85°C
n RoHS Compliant SOIC 8-lead and MSOP 8-lead
packages
APPLICATIONS
n Microprocessor and microcontroller based
systems
n Instrument and control systems
n Portable equipment
DESCRIPTION
The CAT705, CAT706, and CAT813 provide reset and
monitoring functions for the electronic systems. Each
device monitors the system voltage and maintains a
reset output until that voltage reaches the device’s
specified trip value and then maintains the reset
output active condition until the device’s internal timer
allows the system power supply to stabilize.
The devices have a watchdog input which can be
used to monitor a system signal and causes W¯¯D¯O¯ to
go low if the signal fails to change state prior to a
timeout condition.
The supervisory circuits provide a ¯M¯R¯ input which
initiates a reset if pulled low. The CAT705 and
CAT706 provide an active low R¯¯E¯S¯E¯T¯ output. The
CAT813 provides an active high RESET output.
There is a secondary supply monitor (PFI) included for
power-fail warning.
For Ordering Information details, see page 13.
PIN CONFIGURATION
SOIC 8-Lead
MR 1
8 WDO
VCC 2
GND 3
7 RESET
(RESET for CAT813)
6 WDI
PFI 4
5 PFO
MSOP 8-Lead
RESET 1
(RESET for CAT813)
WDO 2
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MR 3
8 WDI
7 PFO
6 PFI
VCC 4
5 GND
PIN FUNCTIONS
Pin Name
¯M¯R¯
VCC
GND
PFI
¯P¯F¯O¯
WDI
R¯¯E¯S¯E¯T¯
RESET
¯W¯¯D¯O¯
Function
Manual Reset Input
Power Supply
Ground
Power Fail voltage monitor Input.
Power Fail Output
Watchdog Timer Input
CMOS Push-Pull Active Low Reset
Output (CAT705 & CAT706)
CMOS Push-Pull Active High Reset
Output (CAT813)
Watchdog Timer Output
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3030, Rev. D

1 page




CAT706 pdf
CAT705, CAT706, CAT813
ELECTRICAL OPERATING CHARACTERISTICS (continued)
Typical values at TA = 25°C and VCC = 5V for CAT705, CAT706, and CAT813 versions;
VCC = 3.3V for the CAT706 T/S versions; VCC = 3.0V for the CAT706 R version.
Symbol Parameter
WATCHDOG INPUT
tWD Watchdog Timeout Period
tWP WDI Pulse Width
VIL WDI Input Voltage(3)
VIH
WDI Input Current(4)
Conditions
VIL = 0.4 V, VIH = 0.8 x VCC
WDI = VCC, Time Average
WDI = 0V, Time Average
Min
1.00
50
0.7 x VCC
-150
Typ Max Units
1.6 2.25 s
ns
0.3 x VCC V
50 150
µA
-50
VW_OH
WDO Output Voltage
VW_OL
MANUAL RESET INPUT
VIL ¯M¯R¯ Input Voltage
VIH
¯M¯R¯ Pull-up Current
tPB
tPDLY
¯M¯R¯ Pulse Width
¯M¯R¯ low to Reset Delay(5)
POWER-FAIL INPUT
PFI Input Threshold
PFI Input Current
VRST (max) < VCC < 3.6 V
ISOURCE = -500 µA
4.5 V < VCC < 5.5 V,
ISOURCE = -800 µA
VRST (max) < VCC < 3.6 V,
ISINK = +500 µA
4.5 V < VCC < 5.5 V,
ISINK = 1.2 mA
¯M¯R¯ = 0 V
VCC = 5 V
0.8 x VCC
VCC – 1.5 VCC – 0.25
0.3
0.1 0.4
V
0.7 x VCC
40
1
1.2
-25
0.3 x VCC V
70 140 µA
µs
5 µs
1.25 1.3 V
0.01 25 nA
VP_OH
¯P¯F¯O¯ Output Voltage
VP_OL
VRST (max) < VCC < 3.6 V,
ISOURCE = -500 µA
4.5 V < VCC < 5.5 V,
ISOURCE = -800 µA
VRST (max) < VCC < 3.6 V,
ISINK = +1.2 mA
4.5 V < VCC < 5.5 V,
ISINK = 3.2 mA
0.8 x VCC
VCC - 1.5V
0.4
V
0.3
0.4
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Notes:
(3) WDI is internally serviced within the watchdog period if WDI is left open.
(4) The WDI input current is specified as an average input current when the WDI input is driven high or low. The WDI input if connected to a
three-stated output device can be disabled in the tristate mode as long as the leakage current is less than 10µA and a maximum
capacitance of less than 200pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200µA
when active.
(5) R¯¯E¯S¯E¯T¯ for CAT705 & CAT706 & RESET for CAT813.
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-3030, Rev. D

5 Page





CAT706 arduino
PACKAGE OUTLINE DRAWINGS
MSOP 8-Lead 3.0 x 3.0mm (Z) (1) (2)
E E1
TOP VIEW
A A2
A1
D
e
SIDE VIEW
b
c
CAT705, CAT706, CAT813
SYMBOL
A
A1
A2
b
c
D
E
E1
e
L
L1
L2
θ
MIN
0.05
0.75
0.22
0.13
2.90
4.80
2.90
0.40
NOM
0.10
0.85
3.00
4.90
3.00
0.65 BSC
0.60
0.95 REF
0.25 BSC
MAX
1.10
0.15
0.95
0.38
0.23
3.10
5.00
3.10
0.80
END VIEW
DETAIL A
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L
L1
DETAIL A
θ
L2
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-187
© 2010 SCILLC. All rights reserved.
Characteristics subject to change without notice
11
Doc. No. MD-3030, Rev. D

11 Page







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