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PDF CAT812 Data sheet ( Hoja de datos )

Número de pieza CAT812
Descripción 4-Pin Microprocessor Power Supply Supervisors
Fabricantes Catalyst Semiconductor 
Logotipo Catalyst Semiconductor Logotipo



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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

1 page




CAT812 pdf
CAT811, CAT812
ELECTRICAL CHARACTERISTICS (continued)
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.
Parameter
Symbol
Reset Threshold Tempco
VCC to Reset Delay (Note 2)
Reset Active Timeout Period
RESET Output Voltage Low
(Push-pull, active LOW,
CAT811)
VOL
RESET Output Voltage High
(Push-pull, active LOW,
CAT811)
VOH
RESET Output Voltage Low
(Push-pull, active HIGH,
CAT812)
VOL
Conditions
VCC = VTH to (VTH - 100 mV)
TA = -40˚C to +85˚C
VCC = VTH min, ISINK = 1.2 mA
CAT811R/S/T/Z
VCC = VTH min, ISINK = 3.2 mA
CAT811J/L/M
VCC > 1.0 V, ISINK = 50 µA
VCC = VTH max, ISOURCE = 500 µA
CAT811R/S/T/Z
VCC = VTH max, ISOURCE = 800 µA
CAT811J/L/M
VCC > VTH max, ISINK = 1.2 mA
CAT812R/S/T/Z
VCC > VTH max, ISINK = 3.2 mA
CAT812J/L/M
Min Typ(1) Max Units
30 ppm/˚C
20 µs
140 240 400 ms
0.3
0.8 VCC
VCC - 1.5
V
0.4
0.3
V
0.3
V
0.4
RESET Output Voltage High
(Push-pull active HIGH,
CAT812)
VOH
1.8 V < VCC VTH min, ISOURCE = 150 µA 0.8 VCC
V
MR Minimum Pulse Width
MR Glitch Immunity
MR to RESET Propagation
Delay
MR Input Threshold
MR Pull-up Resistance
tMR
Note 3
tMD Note 2
VIH VCC > VTH (MAX), CAT811/812L/M/J
VIL
VIH VCC > VIH (MAX), CAT811/812R/S/T/Z
VIL
10
100
µs
ns
0.5 µs
2.3 V
0.7VCC
0.8
V
0.25VCC
10 20 30 k
Note 1: Production testing done at TA = +25˚C; limits over temperature guaranteed by design only.
Note 2: RESET output for the CAT811; RESET output for the CAT812
Note 3: Glitches of 100 ns or less typically will not generate a reset pulse.
Patent Pending
5 Doc. No. 3005, Rev. P

5 Page





CAT812 arduino
Copyrights, Trademarks and Patents
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP AE2
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents
issued to Catalyst Semiconductor contact the Companys corporate office at 408.542.1000.
CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS
PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE
RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING
OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or
other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a
situation where personal injury or death may occur.
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets
labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate
typical semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc.
Corporate Headquarters
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: 408.542.1000
Fax: 408.542.1200
www.catalyst-semiconductor.com
Publication #:
Revison:
Issue date:
Type:
3005
P
3/25/04
Final
Patent Pending

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