CAT811LEUS-T10 - Catalyst Semiconductor, Inc.

CAT811, 812

Low Cost Microcontroller Power Supply Supervisors with Manual Reset

FEATURES

■Precision monitoring of 5V, 3.3V, 3.0V and 2.5V

power supply voltages

■Manual reset input

■Seven reset threshold options

— 4.63, 4.38, 4.00, 3.08, 2.93, 2.63 and 2.32V

■Two push-pull reset output configurations

— CAT811: Active LOW reset

— CAT812: Active HIGH reset

■140ms minimum reset period

■ RESET RESET

RESET RESET

RESET guaranteed to VCC = 1V

■Low supply current 6µA typ.

■Power supply transient immunity

■No external components required

■Compact 4-pin SOT143 package

■Direct MAX811, MAX812 replacement

■100 year data retention

■Commercial, industrial and automotive

temperature ranges

Characteristics subject to change without notice Doc. No. 3005,Rev. K

Preliminary Information

APPLICATIONS

■Computers

■Servers

■Laptops

■Cable modems

■ Wireless communications

■Embedded control systems

■White goods

■Power meters

■Intelligent instruments

■PDAs and handheld equipment

DESCRIPTION

The CAT811/812 are microprocessor supervisory circuits

that monitor power supplies in microprocessor-based

systems and other digital systems. The CAT811 and

CAT812 have a manual reset. Featuring reduced power

supply current, the CAT811/812 are direct replacements

for the MAX811 and MAX812.

A reset signal is asserted if the power supply voltage drops

below a preset threshold level. Seven threshold levels are

available to support 5V, 3.3V, 3.0V and 2.5V systems. The

CAT811 has an active LOW reset output that is guranteed

to be asserted for at least 140ms after the supply voltage

has risen above the threshold voltage. The CAT812 has

an active HIGH reset. The CAT811/812 have push-pull

outputs that do not require pull-up resistors. Fast transients

on the power supply are ignored and the outputs are

guaranteed to be in the correct state with the power supply

voltage as low as 1V.

The CAT811/812 are fully specified over the operating

temperature range and are available in a compact 4-pin

SOT143 package.

Seven threshold voltage options are available:

Normal Threshold Threshold Suffix

Voltage Designation

4.63V L

4.38V M

4.00V J

3.08V T

2.93V S

2.63V R

2.32V Z

PIN CONFIGURATION

GND

RESET

(RESET)

VCC

CAT811

CAT812

SOT143

CAT811, CAT812 Preliminary Information

Doc. No. 3005, Rev. K Patent Pending

Pin Number

CAT811 CAT812

1 1 GND Ground

2—RESET Active LOW reset. RESET is asserted if VCC falls below the reset threshold

and remains low for at least 140ms after VCC rises above the reset threshold.

— 2 RESET Active HIGH reset. RESET is asserted if VCC falls below the reset

threshold and remains low for at least 140ms after VCC rises above

the reset threshold.

33MR Manual Reset Input. A logic LOW on MR asserts RESET. RESET remains

active as long as MR is LOW and for 140ms after MR returns HIGH. The

active low input has an internal 20kΩ pull-up resistor. The input should be left

open if not used. It can be driven by TTL or CMOS logic or shorted to ground

by a switch.

44V

CC Power supply voltage that is monitored.

Ordering Nominal Threshold Temperature Manual RESET Package Parts TOP Marking

Part Number Voltage (V) Range Reset Polarity per Reel

CAT811LEUS-T10 4.63 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 10K AMxx

CAT811LEUS-T 4.63 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 3K AMxx

CAT811MEUS-T10 4.38 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 10K ANxx

CAT811MEUS-T 4.38 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 3K ANxx

CAT811JEUS-T10 4.00 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 10K AOxx

CAT811JEUS-T 4.00 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 3K AOxx

CAT811TEUS-T10 3.08 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 10K APxx

CAT811TEUS-T 3.08 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 3K APxx

CAT811SEUS-T10 2.93 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 10K AQxx

CAT811SEUS-T 2.93 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 3K AQxx

CAT811REUS-T10 2.63 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 10K ARxx

CAT811REUS-T 2.63 -40˚C to 105˚C Yes Push-Pull, Active LOW 4-pin, SOT143 3K ARxx

CAT811ZEUS-T 2.32 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K AYxx

CAT811ZEUS-T10 2.32 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K AYxx

CAT812LEUS-T10 4.63 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K ASxx

CAT812LEUS-T 4.63 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K ASxx

CAT812MEUS-T10 4.38 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K ATxx

CAT812MEUS-T 4.38 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K ATxx

CAT812JEUS-T10 4.00 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K AUxx

CAT812JEUS-T 4.00 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K AUxx

CAT812TEUS-T10 3.08 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K AVxx

CAT812TEUS-T 3.08 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K AVxx

CAT812SEUS-T10 2.93 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K AWxx

CAT812SEUS-T 2.93 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K AWxx

CAT812REUS-T10 2.63 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K AXxx

CAT812REUS-T 2.63 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K AXxx

CAT812ZEUS-T10 2.32 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 10K CIxx

CAT812ZEUS-T 2.32 -40˚C to 105˚C Yes Push-Pull, Active HIGH 4-pin, SOT143 3K CIxx

ORDERING INFORMATION

PIN DESCRIPTIONS

Name Description

Preliminary Information CAT811, CAT812

Patent Pending Doc. No. 3005, Rev. K

ABSOLUTE MAXIMUM RATINGS*

Terminal Voltage (with respect to ground)

VCC .............................................................................. –0.3V to +6.0V

RESET, RESET (push-pull)............. –65°C to +150°C

Input Current, VCC .............................................. 20mA

Output Current, RESET, RESET ....................... 20mA

Rate of Rise, VCC .............................................................. 100V/µs

Continuous Power Dissipation

Derate 4mW/˚C above 70˚C ......................... 320mW

Operating Temperature Range........ –40°C to +105°C

Storage Temperature Range........... –65°C to +150°C

Lead Soldering Temperature (10 sec).............. 300°C

*COMMENT

Stresses above those listed under “Absolute Maximum

Ratings” may cause permanent damage to the device.

These are stress ratings only, and functional operation of

the device at these or any other conditions outside of those

listed in the operational sections of this specification is not

implied. Exposure to any absolute maximum rating for

extended periods may affect device performance and

reliability.

ELECTRICAL CHARACTERISTICS

VCC = Full range, TA = -40˚C to +105˚C unless otherwise noted. Typical values at TA = +25˚C are VCC=5V for

the L/M/J versions, VCC=3.3V for the T/S versions, VCC=3V for the R version and VCC=2.5V for the Z version.

Parameter Symbol Conditions Min Typ Max Units

VCC Range TA = 0˚C to +70˚C 1.0 5.5

TA = -40˚C to +105˚C 1.2 5.5

VCC < 5.5V, J/L/M 8 20

VCC < 3.6V, R/S/T/Z 6 15

VCC < 5.5V, L/M 35

VCC < 3.6V, R/S/T/Z 30

TA = +25˚C 4.56 4.63 4.70

TA = -40˚C to +85˚C 4.50 4.75

TA = +85˚C to +105˚C 4.40 4.86

TA = +25˚C 4.31 4.38 4.45

TA = -40˚C to +85˚C 4.25 4.50

TA = +85˚C to +105˚C 4.16 4.56

TA = +25˚C 3.93 4.00 4.06

TA = -40˚C to +85˚C 3.89 4.10

TA = +85˚C to +105˚C 3.80 4.20

TA = +25˚C 3.04 3.08 3.11

TA = -40˚C to +85˚C 3.00 3.15

TA = +85˚C to +105˚C 2.92 3.23

TA = +25˚C 2.89 2.93 2.96

TA = -40˚C to +85˚C 2.85 3.00

TA = +85˚C to +105˚C 2.78 3.08

TA = +25˚C 2.59 2.63 2.66

TA = -40˚C to +85˚C 2.55 2.70

TA = +85˚C to +105˚C 2.50 2.76

TA = +25˚C 2.28 2.32 2.35

TA = -40˚C to +85˚C 2.25 2.38

TA = +85˚C to +105˚C 2.21 2.45

TA = -40˚C to +85˚C

TA = +85˚C to +105˚C

Supply Current ICC

µA

L Threshold

M Threshold

J Threshold

T Threshold

S Threshold

R Threshold

Z Threshold

Reset

Threshold

Voltage

VTH

CAT811, CAT812 Preliminary Information

Doc. No. 3005, Rev. K Patent Pending

ELECTRICAL CHARACTERISTICS

VCC = Full range, TA = -40˚C to +105˚C unless otherwise noted. Typical values at TA = +25˚C and VCC=5V for

L/M/J versions, VCC=3.3V for T/S versions, VCC=3V for R version and VCC=2.5V for Z version.

Parameter Symbol Conditions Min Typ Max Units

Reset Threshold Tempco 30 ppm/˚C

VCC to Reset Delay (Note 2) VCC = VTH to (VTH - 100mV) 20 µs

Reset Active Timeout Period TA = -40˚C to +85˚C 140 240 560

TA = +85˚C to +105˚C 100 840

VCC = VTH min, ISINK = 1.2mA

CAT811R/S/T/Z

VCC = VTH min, ISINK = 3.2mA

CAT811J/L/M

VCC > 1.0V, ISINK = 50µA0.3

VCC = VTH max, ISOURCE = 500µA

CAT811R/S/T/Z

VCC = VTH max, ISOURCE = 800µA

CAT811J/L/M

VCC > VTH max, ISINK = 1.2mA

CAT812R/S/T/Z

VCC > VTH max, ISINK = 3.2mA

CAT812L/M

MR Minimum Pulse Width tMR 10 µs

MR Glitch Immunity Note 3 100 ns

MR to RESET Propagation

Delay tMD Note 2 0.5 µs

VIH VCC > VTH(MAX), CAT811/812L/M/J 2.3 V

VIL 0.8

VIH VCC > VTH(MAX), CAT811/812R/S/T 0.7VCC

VIL 0.25VCC

MR Pull-up Resistance 10 20 30 kΩ

(continued)

Reset Active Timeout Period ms

RESET Output Voltage Low

(Push-pull, active LOW,

CAT811) VOL

0.3

0.4 V

VOH

RESET Output Voltage High

(Push-pull, active LOW,

CAT811)

VOL

RESET Output Voltage Low

(Push-pull, active HIGH,

CAT812)

0.3

0.4

RESET Output Voltage High

(Push-pull active HIGH,

CAT812) VOH 1.8V < VCC ≤ VTH min, ISOURCE = 150µA0.8VCC

0.8VCC

VCC - 1.5

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 100ns or less typically will not generate a reset pulse.

MR Input Threshold

Preliminary Information CAT811, CAT812

Patent Pending Doc. No. 3005, Rev. K

TYPICAL OPERATING CHARACTERISTICS

VCC = Full range, TA = -40˚C to +105˚C unless otherwise noted. Typical values at TA = +25˚C and VCC=5V for

L/M/J versions, VCC=3.3V for T/S versions, VCC = 3V for R version and VCC = 2.5V for Z version.

SUPPLY CURRENT VS. TEMPERATURE

(NO LOAD, CAT8xxR/S/T/Z)

-50 0 50 100 150

SUPPLY CURRENT (µA)

TEMPERATURE (˚C)

POWER-DOWN RESET DELAY VS. TEMPERATURE

(CAT8xxR/S/T/Z)

POWER-DOWN RESET DELAY (µS)

TEMPERATURE (˚C)

POWER-UP RESET TIMEOUT

VS. TEMPERATURE

220

200

180

160

140

120

POWER-UP RESET TIMEOUT (mS)

TEMPERATURE (˚C)

NORMALIZED RESET THRESHOLD

VS. TEMPERATURE

1.0002

0.9998

0.9996

0.9994

0.9992

0.999

0.9988

0 20 40 60 80 100 120

NORMALIZED THRESHOLD

TEMPERATURE (˚C)

VCC=3.6V

VCC=5.5V

-50 0 50 100 150

VCC=5.5V

VCC=2.5V

-50 0 50 100 150

CAT811, CAT812 Preliminary Information

Doc. No. 3005, Rev. K Patent Pending

DETAILED DESCRIPTIONS

RESET TIMING

The reset signal is asserted LOW for the CAT811 and HIGH for the CAT812 when the power supply voltage falls below

the threshold trip voltage and remains asserted for 140ms minimum after the power supply voltage has risen above

the threshold.

VCC TRANSIENT RESPONSE

The CAT811/812 protect µPs from brownouts and low VCC. Short duration transients of 100mV amplitude and 20µs

or less duration typically do not cause a false RESET.

Power

Supply

Voltage

RESET

Threshold

Voltage

140ms

minimum

Active Reset

Timeout Period

CAT811

CAT812

Active Reset

Timeout Period

FIGURE 1. Reset and Manual Reset (MR) Timing Diagram

400

320

240

160

1 10 100 1000

MAXIMUM TRANSIENT DURATION (µs)

RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)

TBD

FIGURE 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive

Preliminary Information CAT811, CAT812

Patent Pending Doc. No. 3005, Rev. K

VALID RESET WITH VCC UNDER 1.0

To ensure that the CAT811 RESET pin is in a known state when VCC is under 1.0V, a 100kΩ pull-down resistor between

RESET pin and GND is recommended; the value is not critical. For the CAT812, a pull-up resistor from RESET pin

to VCC is needed.

BI-DIRECTIONAL RESET PIN INTERFACING

The CAT811/812 can interface with µP/µC bi-directional reset pins by connecting a 4.7kΩ resistor in series with the

CAT811/812 reset output and the µP/µC bi-directional reset pin.

CAT811

GND

VCC

100kΩ

Power

Supply

RESET

CAT812

GND

VCC

100kΩ

Power

Supply

RESET

FIGURE 3. RESETRESET

RESETRESET

RESET Valid with VCC Under 1.0V FIGURE 4. RESET Valid with VCC Under 1.1V

FIGURE 5. Bi-directional Reset Pin Interfacing

CAT811

GND

VCC

4.7kΩ

Power

Supply

RESET

Buffered

RESET

BUF

Bi-directional

I/O Pin

RESET

INPUT

GND

µP

(For example: 68HC11)

CAT811, CAT812 Preliminary Information

Doc. No. 3005, Rev. K Patent Pending

PACKAGE INFORMATION

Plastic SOT143 (4-Pin)

0.10 MAX

0.013 MIN

1.12 MAX

0.89 MIN

3.04 MAX

2.80 MIN

0.94 MAX

0.88 MIN

2.64 MAX

2.10 MIN

2.05 MAX

1.78 MIN

0.89 MAX

0.76 MIN

0.20 0.51 MAX

0.37 MIN

1.40 MAX

1.20 MIN

0.18 MAX

0.085 MIN

0.54 REF 0.41 MAX

0.21 MIN

0.20

GAUGE PLANE

OTHER SUPERVISORY PRODUCTS

Function CAT1161/3 CAT1162 CAT809 CAT810 CAT811 CAT812

With 16K Bit Serial EEPROM Memory

Watchdog Timer

Manual Reset Input

Active Low Reset

Active High Reset

Dual Polarity Reset Outputs

Package 8-pin 8-pin 3-pin 3-pin 4-pin 4-pin

DIP and SOIC DIP and SOIC SOT23 and SOT23 and SOT143 SOT143

SC70 SC70

Preliminary Information CAT811, CAT812

Patent Pending Doc. No. 3005, Rev. K

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 Company’s corporate office at 408.542.1000.

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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.

Publication #: 3005

Revison: K

Issue date: 8/19/03

Type: Preliminary

Patent Pending

Catalyst Semiconductor, Inc.

Corporate Headquarters

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Sunnyvale, CA 94089

Phone: 408.542.1000

Fax: 408.542.1200