CAT811RTBI-GT3 - ON Semiconductor

May, 2012 − Rev. 1

1Publication Order Number:

CAT811/D

CAT811, CAT812

4-Pin Microprocessor

Power Supply Supervisors

with Manual Reset

Description

The CAT811 and CAT812 are microprocessor supervisory circuits

that monitor power supplies. 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 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) 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 SOT−143

package.

Features

•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

•Manual Reset Input

•Offered in Two Output Configurations: CAT811: Active LOW Reset

CAT812: Active HIGH Reset

•Direct Replacements for the MAX811 and MAX812 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

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PIN CONFIGURATION

See detailed ordering and shipping information in the package

dimensions section on page 9 of this data sheet.

ORDERING INFORMATION

SOT−143

BI SUFFIX

CASE 527AF

(Top View)

RESET

GND VCC

MARKING DIAGRAM

XXX = Specific Device Code

M = Month Code

G= Pb−Free Package

(*Note: Microdot may be in either location)

XXXMG

CAT811, CAT812

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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

Pin Name Description

CAT811 CAT812

1 1 GND Ground.

2−RESET Active LOW reset. RESET is asserted if VCC falls below the reset threshold and re-

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

−2 RESET Active HIGH reset. RESET is asserted if VCC falls below the reset threshold and re-

mains high for at least 140 ms after VCC rises above the reset threshold.

3 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 resistor. The input should be left open if not used.

4 4 VCC Power supply voltage that is monitored.

Figure 1. Block Diagrams

CAT812

RESET

–

RESET

DIGITAL

DELAY

TOLERANCE

BIAS

VOLTAGE

REFERENCE

GND

CAT811

–

RESET

DIGITAL

DELAY

TOLERANCE

BIAS

VOLTAGE

REFERENCE

GND

VCC

RESET

VCC

CAT811, CAT812

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Table 3. ABSOLUTE MAXIMUM RATINGS

Parameters Ratings Units

Any pin with respect to ground −0.3 to +6.0 V

Input Current, VCC 20 mA

Output Current RESET, RESET 20 mA

Rate of Raise, VCC 100 V/ms

Continuous Power Dissipations

Derate 4 mW/°C above +70°C (SOT−143)

320 mW

Storage Temperature Range −65 to +105 °C

Operating Ambient Temperature Range −40 to +85 °C

Lead Soldering Temperature (10 seconds) +300 °C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

Table 4. ELECTRICAL 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 the L/M/J versions,

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

Parameter Symbol Conditions Min Typ Max Units

VCC Range TA = 0°C to +70°C 1.0 5.5 V

TA = −40°C to +85°C 1.2 5.5

Supply Current ICC TA = −40°C to +85°CVCC < 5.5 V, J/L/M 8 20 mA

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

Reset Threshold

Voltage

VTH L Threshold TA = +25°C 4.56 4.63 4.70 V

TA = −40°C to +85°C 4.50 4.75

M Threshold TA = +25°C 4.31 4.38 4.45

TA = −40°C to +85°C 4.25 4.50

J Threshold TA = +25°C 3.93 4.00 4.06

TA = −40°C to +85°C 3.89 4.10

T Threshold TA = +25°C 3.04 3.08 3.11

TA = −40°C to +85°C 3.00 3.15

S Threshold TA = +25°C 2.89 2.93 2.96

TA = −40°C to +85°C 2.85 3.00

R Threshold TA = +25°C 2.59 2.63 2.66

TA = −40°C to +85°C 2.55 2.70

Z Threshold TA = +25°C 2.28 2.32 2.35

TA = −40°C to +85°C 2.25 2.38

Reset Threshold

Tempco

30 ppm/°C

VCC to Reset Delay

(Note 3)

VCC = VTH to (VTH − 100 mV) 20 ms

Reset Active

Timeout Period

TA = −40°C to +85°C 140 240 400 ms

1. Production testing done at TA = +25°C; limits over temperature guaranteed by design only.

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

3. RESET output for the CAT811; RESET output for the CAT812.

CAT811, CAT812

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Table 4. ELECTRICAL 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 the L/M/J versions,

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

Parameter UnitsMaxTypMinConditionsSymbol

RESET Output

Voltage Low

(Push−pull, active

LOW, CAT811)

VOL VCC = VTH min, ISINK = 1.2 mA CAT811R/S/T/Z 0.3 V

VCC = VTH min, ISINK = 3.2 mA CAT811J/L/M 0.4

VCC > 1.0 V, ISINK = 50 mA0.3

RESET Output

Voltage High

(Push−pull, active

LOW, CAT811)

VOH VCC = VTH max, ISOURCE = 500 mA CAT811R/S/T/Z 0.8VCC V

VCC = VTH max, ISOURCE = 800 mA CAT811J/L/M VCC − 1.5 V

RESET Output

Voltage Low

(Push−pull, active

HIGH, CAT812)

VOL VCC > VTH max, ISINK = 1.2 mA CAT812R/S/T/Z 0.3 V

VCC > VTH max, ISINK = 3.2 mA CAT812J/L/M 0.4

RESET Output

Voltage High

(Push−pull active

HIGH, CAT812)

VOH 1.8 V < VCC ≤ VTH min, ISOURCE = 150 mA0.8VCC V

MR Minimum Pulse

Width

tMR 10 ms

MR Glitch Immunity (Note 2) 100 ns

MR to RESET

Propagation Delay

tMD (Note 3) 0.5 ms

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

VIL 0.8

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

VIL 0.25VCC

MR Pull−up

Resistance

10 20 75 kW

1. Production testing done at TA = +25°C; limits over temperature guaranteed by design only.

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

3. RESET output for the CAT811; RESET output for the CAT812.

CAT811, CAT812

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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 the L/M/J versions,

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

Figure 2. Power−Up Reset Timeout vs.

Temperature

Figure 3. Supply Current vs. Temperature

(No Load, CAT8xxR/S/T/Z)

TEMPERATURE (°C) TEMPERATURE (°C)

150100500−50

160

180

200

220

240

260

150100500−50

Figure 4. Power−Down Reset Delay vs.

Temperature (CAT8xxR/S/T/Z)

Figure 5. Normalized Reset Threshold vs.

Temperature

TEMPERATURE (°C) TEMPERATURE (°C)

150100500−50

120100806040200

0.9988

0.9990

0.9992

0.9994

0.9996

0.9998

1.0000

1.0002

POWER−UP RESET TIMEOUT (ms)

SUPPLY CURRENT (mA)

POWER−DOWN RESET DELAY (s)

NORMALIZED THRESHOLD

VCC = 5 V

VCC = 2.5 V

VCC = 5.5 V

VCC = 3.6 V

CAT811, CAT812

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DETAILED DESCRIPTION

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 at least 140 ms after the power supply voltage has risen above the threshold.

5 V

0 V

5 V

0 V

Threshold

Voltage

140 ms

minimum

Reset Timeout Period

Power

Supply

Voltage

Figure 6. Reset Timing Diagram

RESET

5 V

0 V

RESET

CAT811

CAT812

VCC Transient Response

The CAT811/812 protect mPs against brownout failure.

Short duration transients of 4 ms or less and 100 mV

amplitude typically do not cause a false RESET.

Figure 7 shows the maximum pulse duration of

negative−going VCC transients that do not cause a reset

condition. As the amplitude of the transient goes further

below the threshold (increasing VTH − VCC), the maximum

pulse duration decreases. In this test, the VCC starts from an

initial voltage of 0.5 V above the threshold and drops below

it by the amplitude of the overdrive voltage (VTH − VCC).

Figure 7. Maximum Transient Duration without

Causing a Reset Pulse vs. Reset Comparator

Overdrive

RESET OVERDRIVE VTH − VCC (mV)

1000100101

TRANSIENT DURATION (ms)

CAT8xxZ

TAMB = 25°C

CAT8xxM

Valid Reset with VCC under 1.0 V

To ensure that the CAT811 RESET pin is in a known state

when VCC is under 1.0 V, a 100 kW 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.

Figure 8. RESET Valid with VCC Under 1.0 V

Figure 9. RESET Valid with VCC Under 1.1 V

GND

CAT812

RESET

Power

Supply

GND 100 kW

CAT811

Power

Supply

VCC

100 kW

VCC

RESETMR

CAT811, CAT812

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Bi−directional Reset Pin Interfacing

The CAT811/812 can interface with mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with the

CAT811/812 reset output and the mP/mC bi−directional reset pin.

Figure 10. Bi−directional Reset Pin Interfacing

GND

4.7 kW

CAT811

GND

BUF

INPUT

Power

Supply

(for example: 68HC11)

Buffered

Bi−directional I/O Pin

RESET

VCC

MR RESET RESET

Table 5. OTHER SUPERVISORY PRODUCTS

Function CAT1161/3 CAT1162 CAT809 CAT810 CAT811 CAT812

With 16k Bit Serial EEPROM Memory a a

Watchdog Timer a

Manual Reset Input a a a a

Active Low Reset a a

Active High Reset a a

Dual Polarity Reset Outputs a a

Package 8−pin DIP

and SOIC

8−pin DIP

and SOIC

3−pin SOT−23

and SC70

3−pin SOT−23

and SC70

4−pin

SOT−143

4−pin

SOT−143

CAT811, CAT812

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PACKAGE DIMENSIONS

SOT−143, 4 Lead

CASE 527AF−01

ISSUE A

E1 E

e1 b

TOP VIEW

SIDE VIEW END VIEW

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC TO-253.

SYMBOL

MIN NOM MAX

0°8°

0.05

0.75

0.30

0.76

0.40

0.08

2.80

2.10

1.92 BSC

0.54 REF

1.22

0.15

1.07

0.50

0.89

0.60

0.20

3.04

2.64

0.50

0.90

2.90

e1 0.20 BSC

E1 1.20 1.401.30

L2 0.25

0.80

CAT811, CAT812

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ORDERING INFORMATION

Order Number

Voltage

Top Mark (Note 4)

Output Reset Package

Quantity

per Reel

(Note 5)

NiPdAu Matte−Tin NiPdAu Matte−Tin

CAT811LTBI−GT3 CAT811LTBI−T3 4.63 V VEA VES

Manual

Reset LOW SOT−143−4 3,000

CAT811MTBI−GT3 CAT811MTBI−T3 4.38 V VEA VES

CAT811JTBI−GT3 CAT811JTBI−T3 4.00 V VEA VES

CAT811TTBI−GT3 CAT811TTBI−T3 3.08 V VEA VES

CAT811STBI−GT3 CAT811STBI−T3 2.93 V VEA VES

CAT811RTBI−GT3 CAT811RTBI−T3 2.63 V VEA VES

CAT811ZTBI−GT3 CAT811ZTBI−T3 2.32 V VEA VES

CAT812LTBI−GT3 CAT812LTBI−T3 4.63 V VTA VTS

Manual

Reset HIGH SOT−143−4 3,000

CAT812MTBI−GT3 CAT812MTBI−T3 4.38 V VTA VTS

CAT812JTBI−GT3 CAT812JTBI−T3 4.00 V VTA VTS

CAT812TTBI−GT3 CAT812TTBI−T3 3.08 V VTA VTS

CAT812STBI−GT3 CAT812STBI−T3 2.93 V VTA VTS

CAT812RTBI−GT3 CAT812RTBI−T3 2.63 V VTA VTS

CAT812ZTBI−GT3 CAT812ZTBI−T3 2.32 V VTA VTS

4. Threshold and full part numbers will be provided on box and reel labels as well as all Shipping documents.

5. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

6. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device

Nomenclature document, TND310/D, available at www.onsemi.com

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

nor the rights of others. SCILLC 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 SCILLC product could create a situation where personal injury or death may occur. Should

Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,

and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death

associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal

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CAT811/D

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