ON CAX803LTBI-T3, CAX809LTBI-T3, CAX810LTBI-T3 Schematic [ru]

CAX803, CAX809, CAX810

3-Pin Microprocessor
Power Supply Supervisors

Description

The CAX803, CAX809, and CAX810 are supervisory circuits that
monitor power supplies in digital systems. The CAX803, CAX809,
and CAX810 are direct replacements for the MAX803, MAX809 and
MAX810 in applications operating over the industrial temperature range.

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 CAX803 has an open−drain RESET
CAX803 requires a pull−up resistor on the reset output.

The CAX809 features a push−pull RESET
the CAX810 features a push−pull RESET output (active HIGH).

Fast transients on the power supply are ignored and the output is
guaranteed to be in the correct state at V

The CAX803, CAX809, and CAX810 are available in the compact
3−pin SOT−23 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

• Offered in Three Output Configurations:

− CAX803: Open−Drain Active LOW Reset

− CAX809: Push−Pull Active LOW Reset

− CAX810: Push−Pull Active HIGH Reset

• Direct Replacements for the MAX803, MAX809 and MAX810 in

Applications Operating over the Industrial Temperature Range

• Reset Valid down to V

= 1.0 V

CC

• 10 mA Power Supply Current

• Power Supply Transient Immunity

• Industrial Temperature Range: −40°C to +85°C

• Available in SOT−23 Package

• These Devices are Pb−Free and are RoHS Compliant

Applications

• Computers, Servers, Laptops, Cable Modems

• Wireless Communications

• Embedded Control Systems

• White Goods, Power Meters

• Intelligent Instruments

• PDAs and Handheld Equipment

output (active LOW). The

output (active LOW) and

levels as low as 1.0 V.

CC

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SOT−23

TB SUFFIX

CASE 527AG

PIN CONFIGURATION

1

GND

3

2

RESET

(RESET)

(Top View)

MARKING DIAGRAMS

XXXMG

G

SOT−23

XXX = Specific Device Code
M = Month Code
G = 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.

3−Lead SOT23

V

CC

CAX803
CAX809
(CAX810)

© Semiconductor Components Industries, LLC, 2012

October, 2012 − Rev. 1

1 Publication Order Number:

CAX803/D

CAX803, CAX809, CAX810

Table 1. THRESHOLD SUFFIX SELECTOR

Nominal Threshold Voltage Threshold Suffix Designation

4.63 V L

4.55 V H

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 DESCRIPTIONS

Pin Number

CAX803 CAX809 CAX810

1 1 1 GND Ground

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

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

3 3 3 V

Name Description

CC

remains low for at least 140 ms after V

remains high for at least 140 ms after V

Power supply voltage that is monitored.

rises above the reset threshold.

CC

rises above the reset threshold.

CC

Table 3. ABSOLUTE MAXIMUM RATINGS

Parameter Rating Units

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

Input Current, V

Output Current, RESET, RESET 20 mA

Rate of Rise, V

Continuous Power Dissipation

Derate 4 mW/°C above 70°C (SOT23)

Operating Temperature Range −40 to +85 °C

Storage Temperature Range −65 to +105 °C

Lead Soldering Temperature (10 sec) 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.

CC

CC

20 mA

100

320

V/ms

mW

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CAX803, CAX809, CAX810

V

CC

V

V

CC

V

CC

CC

TOLERANCE

BIAS

VOLTAGE

REFERENCE

V

CC

TOLERANCE

BIAS

REFERENCE

+

–

+

–

VOLTAGE

GND

GND

DIGITAL

DELAY

DIGITAL

DELAY

CAX803

V

CC

CAX809

RESET

RESET

V

CC

V

V

CC

CC

TOLERANCE

BIAS

VOLTAGE

REFERENCE

+

–

DIGITAL

DELAY

RESET

CAX810

GND

Figure 1. Block Diagrams

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