Analog Devices ADM809-5SL a Datasheet

Microprocessor

a

FEATURES
Specified over Temperature
Low Power Consumption (17 ␮A)
Precision Voltage Monitor: 3 V, 5 V Options
Reset Assertion Down to 1 V V
30 ms Min Power-On Reset
Logic Low RESET Output
Available in SOT-23 and SC70 Packages

APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems

GENERAL DESCRIPTION

The ADM809-5S/L supervisory circuit monitors the power
supply voltage in microprocessor systems. It provides a reset
output during power-up, power-down, and brownout conditions.
On power-up, an internal timer holds reset asserted for 55 ms.
This holds the microprocessor in a reset state until conditions
have stabilized. The RESET output remains operational with

as low as 1 V. The ADM809-5S/L provides an active low

V

CC

reset signal (RESET).

The reset comparator features built-in glitch immunity,
making it immune to fast transients on V

The ADM809-5S/L consumes only 17 µA, making it suitable
for low power portable equipment.

CC

CC

.

Supervisory Circuit

ADM809-5S/L

FUNCTIONAL BLOCK DIAGRAM

ADM809-5S/L

V

CC

V

REF

V

CC

V

CC

ADM809-5S/L

GND GND

Figure 1. Typical Operating Circuit

GENERATOR

GND

RESET

RESET

55ms

RESET
INPUT

RESET

V

CC

␮P SYSTEM

REV. A

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.

ADM809-5S/L–SPECIFICATIONS

(VCC = Full Operating Range, TA = T
Models, unless otherwise noted.)

MIN

to T

, VCC typ = 5 V for L, 3.3 V for S

MAX

Parameter Min Typ Max Unit Test Conditions/Comments

Operating Voltage Range 1.0 3.3 5.5 V TA = 0°C to 150°C with 100 kΩ Pull-Down on Output

V

CC

(Figure 3)

1.2 3.3 5.5 V T

= –40°C to +150°C with 22 kΩ External Pull-Up

A

on Output (Figure 6)

Supply Current 24 60 µAV

17 50 µAV

< 5.5 V, ADM8_L, TA = –40°C to +150°C

CC

< 3.6 V, ADM8_S, TA = –40°C to +150°C

CC

RESET THRESHOLD

Reset Voltage Threshold

ADM809-5L 4.5 4.75 V T
ADM809-5L 4.40 4.86 V T
ADM809-5S 2.85 3.00 V T

= –40°C to +85°C

A

= 85°C to 150°C

A

= –40°C to +85°C

A

ADM809-5S 2.78 3.08 V TA = 85°C to 150°C

Reset Threshold Temperature Coefficient 30 ppm/°C
VCC to Reset Delay 20 µsV

= VTH to (VTH –100 mV)

CC

Reset Active Timeout Period 30 55 80 ms TA = –40°C to +150°C

RESET Output Voltage Low 0.3 V V

0.4 V V

0.3 V V

RESET Output Voltage High 0.8 V

CC

VV

VCC – 1.5 V VCC > VTH max, I

= VTH min, I

CC

= VTH min, I

CC

>1.0 V, I

CC

VCC >1.2 V, I

> VTH max, I

CC

SINK

SINK

= 50 µA, TA = 0°C to 150°C

SINK

= 50 µA, TA = –40°C to +150°C

SINK

SOURCE

SOURCE

JUNCTION TEMPERATURE –40 +150 °C

ABSOLUTE MAXIMUM RATINGS*

(TA = 25°C, unless otherwise noted.)

VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V

RESET, RESET . . . . . . . . . . . . . . . . . . –0.3 V to V

+ 0.5 V

CC

Input Current

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

V

CC

Output Current

RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Rate of Rise, V

Thermal Impedance, SOT-23 . . . . . . . . . . . . . . . 270°C/W

θ

JA

θ

Thermal Impedance, SC70 . . . . . . . . . . . . . . . . . 146°C/W

JA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/µs

CC

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

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215°C

Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C

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

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods of time may affect device reliability.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADM809-5S/L features proprietary ESD protection circuitry, permanent damage
may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

= 1.2 mA, ADM809-5S
= 3.2 mA, ADM809-5L

= 500 µA

= 800 µA

–2–

REV. A

V

CC

RESET

t1 t1

V

REF

V

REF

V

REF

V

REF

t1 = RESET TIME = 55ms TYP.
V

REF

= RESET VOLTAGE THRESHOLD

PIN CONFIGURATION

1

GND

ADM809-5S/L

3

RESET

TOP VIEW

(Not to Scale)

2

ADM809-5S/L

V

CC

PIN FUNCTION DESCRIPTIONS

Pin No. Mnemonic Function

1GND 0 V. Ground reference for all

signals.

2 RESET Active Low Logic Output. RESET

remains low while V

is below the

CC

reset threshold, and remains low for
55 ms (typ) after V

rises above the

CC

Figure 2. Power Fail

Table I. RESET Threshold Options

Model Threshold (V)

ADM809-5L 4.63
ADM809-5S 2.93

RESET

RESET

Timing

reset threshold.

3VCCSupply Voltage Being Monitored.

ORDERING GUIDE

Reset Temperature Branding

Model Threshold (V) Range Information Quantity (K) Package Type

ADM809-5LART-REEL 4.63 –40°C to +150°C M9L 10 3-Lead SOT-23
ADM809-5LART-REEL-7 4.63 –40°C to +150°C M9L 3 3-Lead SOT-23
ADM809-5LAKS-REEL 4.63 –40°C to +150°C M9L 10 3-Lead SC70
ADM809-5LAKS-REEL-7 4.63 –40°C to +150°C M9L 3 3-Lead SC70
ADM809-5SART-REEL 2.93 –40°C to +150°C M9S 10 3-Lead SOT-23
ADM809-5SART-REEL-7 2.93 –40°C to +150°C M9S 3 3-Lead SOT-23
ADM809-5SAKS-REEL 2.93 –40°C to +150°C M9S 10 3-Lead SC70
ADM809-5SAKS-REEL-7 2.93 –40°C to +150°C M9S 3 3-Lead SC70
ADM809-5SCHIPS 2.93 –40°C to +150°CNA1 Wafer

REV. A

–3–