參數(shù)資料
型號： CAT869T
英文描述： 3-Pin Microprocessor Power Supply Supervisors
中文描述： 3引腳微處理器電源監(jiān)控
文件頁數(shù)： 4/9頁
文件大?。?/td> 542K
代理商： CAT869T
CAT853, CAT863, CAT859, CAT869
4
Doc. No. 3026, Rev. B
2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5V
0V
5V
0V
Threshold
Voltage
140ms
minimum
Reset Timeout Period
Power
Supply
Voltage
RESET
DETAILED DESCRIPTIONS
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 140ms after the power supply voltage has
risen above the threshold.
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
V
CC
TRANSIENT RESPONSE
The CAT853, CAT863, CAT859, and CAT869 protect
μ
Ps against brownout failure. Short duration transients
of 4
μ
sec or less and 100mV amplitude typically do not
cause a false RESET.
Figure 2 shows the maximum pulse duration of negative-
going V
CC
transients that do not cause a reset condition.
Figure 1. Reset Timing Diagram
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 0.5V above the threshold and
drops below it by the amplitude of the overdrive voltage
(V
TH
- V
CC
).
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