NCV803SQ308T1G ON Semiconductor, NCV803SQ308T1G Datasheet - Page 7

• Manufacturer Part Number: NCV803SQ308T1G
• Description: Supervisory Circuits 3.08V SUPERV AUTO
• Manufacturer: ON Semiconductor

Specifications of NCV803SQ308T1G

• Product Category: Supervisory Circuits

V
monitoring
power−down, and brownout/sag conditions, and rejects
negative−going transients (glitches) on the power supply
line. Figure 13 shows the maximum transient duration vs.
maximum negative excursion (overdrive) for glitch
rejection. Any combination of duration and overdrive which
lies under the curve will not generate a reset signal.
Combinations above the curve are detected as a brownout or
power−down. Typically, transient that goes 100 mV below
the reset threshold and lasts 5.0 ms or less will not cause a
reset pulse. Transient immunity can be improved by adding
a capacitor in close proximity to the V
MAX803.
RESET Signal Integrity During Power−Down
1.0 V. Below this voltage the output becomes an “open
circuit” and does not sink current. This means CMOS logic
inputs to the Microprocessor will be floating at an
undetermined voltage. Most digital systems are completely
shutdown well above this voltage. However, in situations
where RESET must be maintained valid to V
ORDERING, MARKING AND THRESHOLD INFORMATION
CC
The MAX803/NCP803 series provides accurate V
The MAX803/NCP803 RESET output is valid to V
250
200
150
100
50
Transient Rejection
0
10
Figure 13. Maximum Transient Duration vs.
Overdrive for Glitch Rejection at 25°C
RESET COMPARATOR OVERDRIVE (mV)
60
V
CC
and
V
110
TH
reset
= 4.63 V
160
Duration
timing
210
V
Overdrive
TH
260
V
during
= 1.2 V
TH
310
APPLICATIONS INFORMATION
CC
CC
= 0 V, since
pin of the
power−up,
360
http://onsemi.com
CC
410
CC
=
7
the NCP803/MAX803 has Open−Drain and active−low
output, it typically uses a pullup resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non−active level due to the pullup resistor
and the reduced sinking capability of the open−drain device.
Therefore, this device is not recommended for applications
where the RESET pin is required to be valid down to
V
MAX803 RESET Output Allows Use With Two Power
Supplies
RESET output is connected to the supply voltage monitored
by the IC. Nevertheless, a different supply voltage can also
power this output and so level−shift from the monitored
supply to reset the microprocessor. However, if the
NCP803/MAX803’s supply goes blew 1 V, the RESET
output ability to sink current will decrease and the result is
a high state on the pin even though the supply’s IC is under
the threshold level. This occurs at a V
on the R
Figure 15. MAX803 RESET Output with Two Supplies
CC
In numerous applications the pullup resistor place on the
= 0 V.
*Assume High−Z Reset Input to Microprocessor
pullup
Figure 14. RESET Signal Integrity
MAX803
NCP803
V
GND
value and the voltage which is connected.
V
CC
RESET
CC
1
MAX809
NCP803
V
GND
V
CC
CC
RESET
R
pullup
Microprocessor
RESET
CC
R1
100 k*
V
GND
V
CC
CC
level that depends
2