CAT859 ONSEMI [ON Semiconductor], CAT859 Datasheet - Page 5

• Manufacturer Part Number: CAT859
• Description: 3-Pin Microprocessor Power Supply Supervisors
• Manufacturer: ONSEMI [ON Semiconductor]

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.
V
The CAT853, CAT863, CAT859, and CAT869 protect
µPs
transients of 4 µs or less and 100 mV amplitude
typically do not cause a false RESET.
Figure 2 shows the maximum pulse duration of
negative-going V
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
CC
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
TRANSIENT RESPONSE
against
Voltage
RESET
Supply
Power
brownout
CC
5 V
0 V
5 V
0 V
transients that do not cause a
failure.
Short
Figure 1. Reset Timing Diagram
duration
RESET OVERDRIVE V
“M” THRESHOLD
5
reset condition. As the amplitude of the transient goes
further below the threshold (increasing V
maximum pulse duration decreases. In this test, the
V
threshold and drops below it by the amplitude of the
overdrive voltage (V
“C” THRESHOLD
CC
T
AMB
TH
starts from an initial voltage of 0.5 V above the
Threshold
- V
Voltage
= 25ºC
CC
[mV]
CAT853, CAT863, CAT859, CAT869
minimum
140 ms
TH
Reset Timeout Period
- V
CC
).
Doc. No. MD-3026, Rev. G
TH
- V
CC
), the