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CAT869MTBI-GT3

P1-P3P4-P6P7-P9
CAT853, CAT859, CAT863, CAT869
http://onsemi.com
4
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(V
CC
= Full range, T
A
= −40°C to +85°C unless otherwise noted. Typical values at T
A
= +25°C and V
CC
= 3.3 V
for the C, S, T versions, V
CC
= 5 V for the M version.)
Figure 2. Power−Up Reset Timeout vs.
Temperature
Figure 3. Supply Current vs. Temperature
(No Load)
TEMPERATURE (°C) TEMPERATURE (°C)
150100500−50
160
180
200
220
240
260
150100500−50
0
2
4
6
8
10
12
Figure 4. Power−Down Reset Delay vs.
Temperature
Figure 5. Normalized Reset Threshold vs.
Temperature
TEMPERATURE (°C) TEMPERATURE (°C)
150100500−50
0
2
4
6
8
10
12
14
120100806040200
0.9988
0.9990
0.9992
0.9994
0.9996
0.9998
1.0000
1.0002
POWER−UP RESET TIMEOUT (ms)
SUPPLY CURRENT (mA)
POWER−DOWN RESET DELAY (ms)
NORMALIZED THRESHOLD
V
CC
= 5 V
V
CC
= 2.5 V
V
CC
= 5.5 V
V
CC
= 3.6 V
CAT853, CAT859, CAT863, CAT869
http://onsemi.com
5
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.
5 V
0 V
5 V
0 V
Threshold
Voltage
140 ms
minimum
Reset Timeout Period
Power
Supply
Voltage
Figure 6. Reset Timing Diagram
RESET
V
CC
Transient Response
The CAT853, CAT863, CAT859, and CAT869 protect mPs
against brownout failure. Short duration transients of 4 ms or
less and 100 mV amplitude typically do not cause a false
RESET.
Figure 7 shows the maximum pulse duration of
negative−going V
CC
transients that do not cause a reset
condition. As the amplitude of the transient goes further
below the threshold (increasing V
TH
− V
CC
), the maximum
pulse duration decreases. In this test, the V
CC
starts from an
initial voltage of 0.5 V above the threshold and drops below
it by the amplitude of the overdrive voltage (V
TH
− V
CC
).
Figure 7. Maximum Transient Duration Without
Causing a Reset Pulse vs. Reset Comparator
Overdrive
RESET OVERDRIVE V
TH
− V
CC
(mV)
1000100101
0
5
10
15
20
25
30
TRANSIENT DURATION (s)
“M” THRESHOLD
“C” THRESHOLD
T
AMB
= 25°C
Valid Reset with V
CC
under 1.0 V
To ensure that the CAT859 and CAT869 RESET pin is in
a known state when V
CC
is under 1.0 V, a > 10 kW
pull−down resistor between RESET
pin and GND is
recommended.
CAT8x9
GND
Power
Supply
Figure 8. RESET Valid with V
CC
Under 1.0 V
10 kW
V
CC
RESET
CAT853, CAT859, CAT863, CAT869
http://onsemi.com
6
Bi−directional Reset Pin Interfacing
The CAT859 and CAT869 can interface with mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with
the CAT859 and CAT869 reset output and the mP/mC bi−directional reset pin.
CAT8x9
GND
Power
Supply
Buffered
BUF
INPUT
GND
Bi−directional
I/O Pin
(For example:
68HC11)
Figure 9. Bi−directional Reset Pin Interfacing
V
CC
RESET
V
CC
4.7 kW
RESET
RESET
mP
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 10. 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 V
CC
pin. The value of the pull−up resistor is not critical in most
applications, typical values being between 5 kW and 10 kW.
CAT8x3
GND
Power
Supply
INPUT
GND
5 kW
Figure 10. Typical CAT8x3 Open−Drain Circuit Configuration
V
CC
RESET
V
CC
mP
RESET
P1-P3P4-P6P7-P9

CAT869MTBI-GT3

Mfr. #:
Buy CAT869MTBI-GT3
Manufacturer:
ON Semiconductor
Description:
Supervisory Circuits Push-pull Act low
Lifecycle:
New from this manufacturer.
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