CAT812LEUS-T Catalyst (ON Semiconductor), CAT812LEUS-T Datasheet - Page 6

• Manufacturer Part Number: CAT812LEUS-T
• Description: Supervisory Circuits 4.63V Push-Pull High
• Manufacturer: Catalyst (ON Semiconductor)

Specifications of CAT812LEUS-T

• Product Category: Supervisory Circuits
• Number Of Voltages Monitored: 1
• Monitored Voltage: 2.5 V, 3 V, 3.3 V, 5 V
• Undervoltage Threshold: 4.56 V
• Overvoltage Threshold: 4.7 V
• Output Type: Active High, Push-Pull
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 240 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-143-4
• Chip Enable Signals: No
• Maximum Power Dissipation: 320 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Factory Pack Quantity: 3000
• Supply Current (typ): 8 uA
• Supply Voltage - Min: 1.2 V

Reset Timing
threshold trip voltage and remains asserted for at least 140 ms after the power supply voltage has risen above the threshold.
V
Short duration transients of 4 ms or less and 100 mV
amplitude typically do not cause a false RESET.
negative−going V
condition. As the amplitude of the transient goes further
below the threshold (increasing V
pulse duration decreases. In this test, the V
initial voltage of 0.5 V above the threshold and drops below
it by the amplitude of the overdrive voltage (V
CC
The reset signal is asserted LOW for the CAT811 and HIGH for the CAT812 when the power supply voltage falls below the
The CAT811/812 protect mPs against brownout failure.
Figure 7 shows the maximum pulse duration of
30
25
20
15
10
5
0
Figure 7. Maximum Transient Duration without
Transient Response
Causing a Reset Pulse vs. Reset Comparator
1
CAT811
CAT812
RESET OVERDRIVE V
RESET
RESET
CAT8xxM
CC
V
CC
10
transients that do not cause a reset
Overdrive
V
5 V
0 V
5 V
0 V
0 V
CC
CAT8xxZ
TH
TH
− V
− V
100
CC
CC
(mV)
CC
T
), the maximum
AMB
Figure 6. Reset Timing Diagram
starts from an
DETAILED DESCRIPTION
TH
= 25°C
− V
http://onsemi.com
1000
CC
).
6
Valid Reset with V
when V
between RESET pin and GND is recommended; the value
is not critical. For the CAT812, a pull−up resistor from
RESET pin to V
To ensure that the CAT811 RESET pin is in a known state
Figure 8. RESET Valid with V
Figure 9. RESET Valid with V
CC
Threshold
Supply
Supply
Power
Voltage
Power
is under 1.0 V, a 100 kW pull−down resistor
CC
CC
is needed.
under 1.0 V
MR
MR
minimum
CAT811
CAT812
140 ms
GND
GND
V
V
RESET
CC
CC
RESET
Reset
Timeout Period
CC
CC
Under 1.0 V
Under 1.1 V
100 kW
100 kW