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CAT811 Datasheet

4-Pin Microprocessor Power Supply Supervisor

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CAT811
4-Pin Microprocessor
Power Supply Supervisor
with Manual Reset
Description
The CAT811 is a microprocessor supervisory circuit that monitors
power supplies. The CAT811 is a direct replacement for the MAX811
in applications operating over the industrial temperature range and has
a manual reset input.
These devices generate a reset signal, which is asserted while the
power supply voltage is below a preset threshold level and for at least
140 ms after the power supply level has risen above that level. The
underlying floating gate technology, Analog EEPROM used by
ON Semiconductor, makes it possible to offer any custom reset
threshold value. Seven industry standard threshold levels are offered
to support +5.0 V, +3.3 V, +3.0 V and +2.5 V systems. The CAT811
features a RESET push−pull output (active LOW).
Fast transients on the power supply are ignored and the output is
guaranteed to be in the correct state at Vcc levels as low as 1.0 V.
The CAT811 is fully specified over the industrial temperature range
(−40°C to 85°C) and is available in a compact 4−pin SOT−143
package.
Features
Precision Monitoring of
+5.0 V (± 5%, ± 10%, ± 20%),
+3.3 V (± 5%, ± 10%)
Manual Reset Input
Output Configuration: Active LOW Reset
Direct Replacements for the MAX811 in Applications Operating
over the Industrial Temperature Range
Reset Valid down to VCC = 1.0 V
6 mA Power Supply Current
Power Supply Transient Immunity
Available in SOT−143 Packages with Sn or NiPdAu Green Lead
Finishes
Industrial Temperature Range: −40°C to +85°C
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Computers, Servers, Laptops and Cable Modems
Wireless Communications
Embedded Control Systems
White Goods, Power Meters
Intelligent Instruments
PDAs and Handheld Equipment
www.onsemi.com
SOT−143
BI SUFFIX
CASE 527AF
PIN CONFIGURATION
1
GND
4
VCC
2
RESET
3
MR
(Top View)
MARKING DIAGRAM
XXXMG
G
1
XXX
M
G
= Specific Device Code
= Month Code
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
July, 2015 − Rev. 3
1
Publication Order Number:
CAT811/D


  ON Semiconductor Electronic Components Datasheet  

CAT811 Datasheet

4-Pin Microprocessor Power Supply Supervisor

No Preview Available !

CAT811
Table 1. THRESHOLD SUFFIX SELECTOR DESCRIPTION
Nominal Threshold Voltage
Threshold Suffix Designation
4.63 V
L
3.08 V
T
2.93 V
S
Table 2. PIN DESCRIPTION
Pin Number Pin Name
Description
1
GND
Ground.
2
RESET
Active LOW reset. RESET is asserted if VCC falls below the reset threshold and remains low for at
least 140 ms after VCC rises above the reset threshold.
3 MR 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 resis-
tor. The input should be left open if not used.
4 VCC Power supply voltage that is monitored.
MR
VCC
VCC
TOLERANCE
BIAS
+
RESET
&
DIGITAL
DELAY
VCC
VOLTAGE
REFERENCE
GND
CAT811
Figure 1. Block Diagrams
RESET
www.onsemi.com
2


Part Number CAT811
Description 4-Pin Microprocessor Power Supply Supervisor
Maker ON Semiconductor
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CAT811 Datasheet PDF






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