CAT811LTBI Datasheet, PDF (2/9 Pages) ON Semiconductor – 4-Pin Microprocessor Power Supply Supervisors with Manual Reset

CAT811, CAT812
Table 1. THRESHOLD SUFFIX SELECTOR DESCRIPTION
Nominal Threshold Voltage
Threshold Suffix Designation
4.63 V
L
4.38 V
M
4.00 V
J
3.08 V
T
2.93 V
S
2.63 V
R
2.32 V
Z
Table 2. PIN DESCRIPTION
Pin Number
CAT811
CAT812
1
1
2
−
Pin Name
GND
RESET
−
2
RESET
3
3
MR
4
4
V_CC
Description
Ground.
Active LOW reset. RESET is asserted if V_CC falls below the reset threshold and re-
mains low for at least 140 ms after V_CC rises above the reset threshold.
Active HIGH reset. RESET is asserted if V_CC falls below the reset threshold and re-
mains high for at least 140 ms after V_CC rises above the reset threshold.
Manual Reset Input. A logic LOW on MR asserts RESET. RESET remains active as
long as MR is LOW and for 140 ms after MR returns HIGH. The active low input has
an internal 20 kW pull−up resistor. The input should be left open if not used.
Power supply voltage that is monitored.
MR
V_CC
V_CC
TOLERANCE
+
BIAS
–
V_CC
RESET
&
DIGITAL
DELAY
VOLTAGE
REFERENCE
GND
CAT811
RESET
MR
V_CC
V_CC
TOLERANCE
+
BIAS
–
RESET
&
DIGITAL
DELAY
V_CC
RESET
VOLTAGE
REFERENCE
GND
CAT812
Figure 1. Block Diagrams
http://onsemi.com
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