Datasheet ADM809-5SART-REEL-7, ADM809-5SART-REEL, ADM809-5LART-REEL-7, ADM809-5LART-REEL, ADM809-5CHIPS Datasheet (Analog Devices)

REV. 0

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a

ADM809-5S/L

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

Microprocessor

Supervisory Circuit

FUNCTIONAL BLOCK DIAGRAM

V

REF

V

CC

RESET

GENERATOR

55ms

ADM809-5S/L

RESET

GND

FEATURES
Specified Over Temperature
Low Power Consumption (17 ␮A)
Precision Voltage Monitor: 3 V, 5 V Options
Reset Assertion Down to 1 V V

CC

30 ms min Power-On Reset
Logic Low RESET Output

APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems

GENERAL DESCRIPTION

The ADM809-5S/L supervisory circuits monitor 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
V

CC

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

reset signal (RESET).

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

CC

.

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

RESET

RESET
INPUT

GND GND

V

CC

V

CC

␮P

SYSTEM

ADM809-5S/L

V

CC

Figure 1. Typical Operating Circuit

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ADM809-5S/L–SPECIFICATIONS

Parameter Min Typ Max Unit Test Conditions/Comments

V

CC

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

(Figure 3)

1.2 3.3 5.5 V T

A

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

on Output (Figure 6)

Supply Current 24 60 µAV

CC

< 5.5 V, ADM8_L, TA = –40°C to +85°C

17 50 µAV

CC

< 3.6 V, ADM8_S, TA = –40°C to +85°C

100 µAV

CC

< 5.5 V, ADM8_L, TA = +85°C to +150°C

100 µAV

CC

< 3.6 V, ADM8_S, TA = +85°C to +150°C

RESET THRESHOLD

Reset Voltage Threshold

ADM809-5L 4.5 4.75 V T

A

= –40°C to +85°C

ADM809-5L 4.40 4.86 V T

A

= +85°C to +150°C

ADM809-5S 2.85 3.00 V T

A

= –40°C to +85°C

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

CC

= VTH to (VTH –100 mV)

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

RESET Output Voltage Low 0.3 V V

CC

= VTH min, I

SINK

= 1.2 mA, ADM809-5S

0.4 V V

CC

= VTH min, I

SINK

= 3.2 mA, ADM809-5L

0.3 V V

CC

>1.0 V, I

SINK

= 50 µA, TA = 0°C to +150°C

VCC >1.2 V, I

SINK

= 50 µA, TA = –40°C to +150°C

RESET Output Voltage High 0.8 V

CC

VV

CC

> VTH max, I

SOURCE

= 500 µA

VCC – 1.5 V VCC > VTH max, I

SOURCE

= 800 µA

JUNCTION TEMPERATURE –40 +150 °C

(VCC = Full Operating Range, TA = T

MIN

to T

MAX

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

Models unless otherwise noted.)

ABSOLUTE MAXIMUM RATINGS*

(TA = 25°C unless otherwise noted)

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

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

CC

+ 0.5 V

Input Current

V

CC

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

Output Current

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

Rate of Rise, V

CC

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

Power Dissipation, RT-3 SOT-23

Derate by 4 mW/°C above 70°C . . . . . . . . . . . . . . . 320 mW

θ

JA

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 333°C/W

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.

WARNING!

ESD SENSITIVE DEVICE

ADM809-5S/L

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PIN FUNCTION DESCRIPTION

Pin Mnemonic Function

1 GND 0 V. Ground reference for all

signals.

2 RESET Active Low Logic Output. RESET

remains low while V

CC

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

CC

rises

above the reset threshold

3V

CC

Supply voltage being monitored.

PIN CONFIGURATION

1

2

TOP VIEW

(Not to Scale)

ADM809-

5S/L

GND

3

RESET

V

CC

V

CC

RESET

t1 t1

V

REF

V

REF

V

REF

V

REF

t1 = RESET TIME = 55ms TYP.
V

REF

= RESET VOLTAGE THRESHOLD

Figure 2. Power Fail

Reset

Timing

Table I. RESET Threshold Options

RESET

Model Threshold

ADM809-5LART 4.63 V
ADM809-5SART 2.93 V

ORDERING GUIDE

Reset Temperature Branding

Model Threshold Range Information Quantity

ADM809-5LART-REEL 4.63 V –40°C to +150°C M9L 10K
ADM809-5LART-REEL-7 4.63 V –40°C to +150°C M9L 3K
ADM809-5SART-REEL 2.93 V –40°C to +150°C M9S 10K
ADM809-5SART-REEL-7 2.93 V –40°C to +150°C M9S 3K
ADM809-5SCHIPS 2.93 V –40°C to +150°C NA 1 Wafer

ADM809-5S/L

–4–

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TEMPERATURE – ⴗC

30

0

–40 –20

020406080

25

20

15

10

5

85

VCC = 5V

VCC = 3V

VCC = 1V

SUPPLY CURRENT

TPC 1. Supply Current vs. Tempera­ture (No Load)

TEMPERATURE – ⴗC

0

–40 –20

020406080

20

40

60

80

100

120

140

160

180

85

VOD = VTH – V

CC

VOD = 20mV

VOD = 100mV

VOD = 200mV

VOD = 10mV

RESET DELAY

TPC 4. Power-Down RESET Delay vs.
Temperature ADM809-5S

–Typical Performance Characteristics

ADM8_L/M

400

350

0

1 10 1000100

300

250

50

200

150

100

ADM8_R/S/T

TITLE

TITLE

TPC 2. Maximum Transient Duration
Without Causing a RESET Pulse vs.
RESET Comparator Overdrive

TEMPERATURE – ⴗC

0.999
–40 –20

0 20406080

1.002

1.0015

1.001

1.0005

1.0

0.9995

85

THRESHOLD

TPC 5. Normalized RESET Voltage
Threshold vs. Temperature

TEMPERATURE – ⴗC

0

–40 –20

020406080

20

40

60

80

100

120

140

160

180

200

85

VOD = VTH – V

CC

VOD = 20mV

VOD = 100mV

VOD = 200mV

VOD = 10mV

RESET DELAY

TPC 3. Power-Down RESET Delay vs.
Temperature ADM809-5L

ADM809-5S/L

–5–

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INTERFACING TO OTHER DEVICES OUTPUT

The ADM809-5S/L is designed to integrate with as many devices
as possible and therefore has an output dependant on V

CC

.
Because of this design approach, interfacing this device to other
devices is simplified.

ENSURING A VALID RESET OUTPUT DOWN TO V

CC

= 0 V

When VCC falls below 0.8 V, ADM809-5S/L’s RESET no longer
sinks current. A high impedance CMOS logic input connected
to RESET may, therefore, drift to undetermined logic levels. To
eliminate this problem a 100 kΩ resistor should be connected
from RESET to ground.

V

CC

V

CC

GND

RESET

ADM809-5S/L

100k⍀

Figure 3. Ensuring a Valid

RESET

Output Down to

V

CC

= 0 V

THE BENEFITS OF A VERY ACCURATE RESET
THRESHOLD

In other microprocessor supervisory circuits, tolerances in supply
voltages lead to an overall increase in RESET tolerance levels
due to the deterioration of the microprocessor RESET circuit’s
power supply. The possibility of a malfunction during a power
failure is greatly reduced because the ADM809-5S/L series can
operate effectively even when there are large degradations of the
supply voltages. Another advantage of the ADM809-5S/L series
is its very accurate internal voltage reference circuit. These
benefits combine to produce an exceptionally reliable Voltage
Monitor Circuit.

INTERFACING TO MICROPROCESSORS WITH
MULTIPLE INTERRUPTS

In a number of cases it is necessary to interface many interrupts
from different devices (i.e., thermal, attitude, and velocity sen­sors). The ADM809-5S/L can easily be integrated into existing
interrupt-handling circuits (Figure 6) or used as a stand-alone
device.

PRIORITY ENCODER

74LS147

4 LINE BCD
TO µP

V

CC

ADM809

GND

RESET

OTHER SENSING

DEVICES

V

CC

Figure 4. Interfacing to µPs with Multiple Interrupts

47k⍀

47k⍀

100nF

3.3V

V

CC

GND

RESET

ADM809-5S/L

Figure 5. Alternative Application Circuit with Extra
Decoupling

22k⍀

100nF

3.3V

V

CC

GND

RESET

ADM809-5S/L

Figure 6. Additional Decoupling Can Be Achieved
Using a 100 nF Capacitor Between V

CC

and Ground

ADM809-5S/L

–6–

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OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

Surface Mount Package

RT-3

0.1200 (3.048)

0.1102 (2.799)

PIN 1

0.0550 (1.397)

0.0470 (1.194)

0.0236 (0.599)

0.0177 (0.450)

0.1040 (2.642)

0.0827 (2.101)

0.0413 (1.049)

0.0374 (0.950)

0.0807 (2.050)

0.0701 (1.781)

1

2

3

SEATING

PLANE

0.0440 (1.118)

0.0320 (0.813)

0.0040 (0.102)

0.0005 (0.013)

0.0210 (0.533)

0.0146 (0.371)

0.027 (0.686)
REF

0.0059 (0.150)

0.0034 (0.086)

0.0100 (0.254)

0.0050 (0.127)

C00090–2.5–9/00 (rev. 0)

PRINTED IN U.S.A.