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CAT812J Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT812J
Beschreibung 4-Pin Microprocessor Power Supply Supervisors
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 11 Seiten
CAT812J Datasheet, Funktion
CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors
FEATURES
ALOGEN FR
LEA D F REETM
s Precision monitoring of
+5.0 V (+/- 5%, +/- 10%, +/- 20%),
+3.3 V (+/- 5%, +/ 10%),
+3.0 V (+/- 10%) and
+2.5 V (+/- 5%) power supplies
s Offered in two output configurations:
- CAT811: Active LOW reset
- CAT812: Active HIGH reset
s Manual reset input
s Direct replacements for the MAX811 and
MAX812 in applications operating over the
industrial temperature range
s Reset valid down to VCC = 1.0 V
s 6 µA power supply current
s Power supply transient immunity
s Compact 4-pin SOT143 package
s Industrial temperature range: -40˚C to +85˚C
APPLICATIONS
s Computers
s Servers
s Laptops
s Cable modems
s Wireless communications
DESCRIPTION
The CAT811 and CAT812 are µP supervisory circuits
that monitor power supplies in digital systems. The
CAT811 and CAT812 are direct replacements for the
MAX811 and MAX812 in applications operating over the
industrial temperature range; both have 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, AE2(TM) used by Catalyst Semiconductor,
makes it possible to offer any custom reset threshold
value. Seven industry standard threshold levels are
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Voltage
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
2.32V
Threshold Suffix
Designation
L
M
J
T
S
R
Z
s Embedded control systems
s White goods
s Power meters
s Intelligent instruments
s PDAs and handheld equipment
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) and the CAT812 features a RESET push-pull
output (active HIGH).
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 CAT811/812 are fully specified over the industrial
temperature range (-40˚C to 85˚C) and are available in
a compact 4-pin SOT143 package.
PIN CONFIGURATION
GND 1
4 VCC
CAT811
(CAT812)
RESET
(RESET)
2
3
© 2004 by Catalyst Semiconductor, Inc., Patent Pending
Characteristics subject to change without notice
1
Doc. No. 3005, Rev. P






CAT812J Datasheet, Funktion
CAT811, CAT812
TYPICAL OPERATING CHARACTERISTICS
VCC = Full range, TA = -40˚C to +85˚C unless otherwise noted. Typical values at TA = +25˚C and VCC = 5 V for
L/M/J versions, VCC=3.3 V for T/S versions, VCC = 3 V for R version and VCC = 2.5 V for Z version.
POWER-UP RESET TIMEOUT
VS. TEMPERATURE
260
240 VCC=5V
220
200
VCC=2.5V
180
160
-50
0 50 100
TEMPERATURE (˚C)
150
SUPPLY CURRENT VS. TEMPERATURE
(NO LOAD, CAT8xxR/S/T/Z)
12
10 VCC=5.5V
8
6 VCC=3.6V
4
2
0
-50
0 50 100
TEMPERATURE (˚C)
150
POWER-DOWN RESET DELAY VS. TEMPERATURE
(CAT8xxR/S/T/Z)
14
12
10
8
6
4
2
0
-50 0
50 100 150
TEMPERATURE (˚C)
1.0002
NORMALIZED RESET THRESHOLD
VS. TEMPERATURE
1
0.9998
0.9996
0.9994
0.9992
0.999
0.9988
0 20 40 60
80 100 120
TEMPERATURE (˚C)
Doc. No. 3005, Rev. P
6
Patent Pending

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