Datasheet ADM809-5SL Datasheet (Analog Devices)

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–

ADM809-5S/L

–Typical Performance Characteristics

30

–40 –20

VCC = 5V

VCC = 3V

VCC = 1V

020406080

TEMPERATURE – ⴗC

25

20

15

10

SUPPLY CURRENT – ␮A

5

0

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

180

160

140

120

100

80

60

40

POWER DOWN RESET – ␮s

20

0

–40 –20

VOD = VTH – V

020406080

TEMPERATURE – ⴗC

CC

VOD = 10mV

VOD = 20mV

VOD = 100mV

VOD = 200mV

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

400

350

300

250

200

150

100

ADM8_S

50

MAXIMUM TRANSIENT DURATION – ␮s

85

0

110 1000100

ADM8_L

RESET COMPARATOR

OVERDRIVE (V

TH

– VCC) – mV

TPC 2. Maximum Transient Dura­tion without Causing a Reset Pulse

200

180

160

140

120

100

80

60

40

POWER-DOWN RESET – ␮s

20

0

–40 –20 020406080

TEMPERATURE – ⴗC

VOD = VTH – V

VOD = 10mV

VOD = 20mV

VOD = 100mV

VOD = 200mV

CC

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

85

vs. Reset Comparator Overdrive

1.0020

1.0015

1.0010

1.0005

1.0000

NORMAL RESET THRESHOLD

0.9995

85

0.9990
–40 –20

020406080

TEMPERATURE – ⴗC

85

TPC 5. Normalized Reset Voltage
Threshold vs. Temperature

–4–

REV. A

INTERFACING TO OTHER DEVICES’ OUTPUT

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

CC

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

V

CC

PRIORITY ENCODER

74LS147

ADM809-5S/L

4-LINE BCD
TO ␮P

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

ADM809-5S/L

RESET

100k⍀

GND

Figure 3. Ensuring a Valid

RESET

Output Down to

VCC = 0 V

V

CC

ADM809

RESET

GND

OTHER SENSING

DEVICES

Figure 4. Interfacing to Microprocessors with
Multiple Interrupts

3.3V

100nF

V

CC

ADM809-5S/L

RESET

GND

47k⍀

47k⍀

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
standalone device.

Figure 5. Alternative Application Circuit with
Extra Decoupling

3.3V
100nF

V

CC

RESET

22k⍀

ADM809-5S/L

GND

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

and Ground

CC

REV. A

–5–

ADM809-5S/L

OUTLINE DIMENSIONS

3-Lead Small Outline Transistor Package [SOT-23]

(RT-3)

Dimensions shown in millimeters

3.04

2.90

1.40

1.30

1.20

PIN 1

0.10

0.01

2.80

3

1

1.90 BSC

SEATING
PLANE

COMPLIANT TO JEDEC STANDARDS TO-236AB

2

2.64

2.10

0.95 BSC

1.12

0.89

0.50

0.30

0.60

0.50

0.40

0.20

0.08

3-Lead Thin Shrink Small Outline Transistor Package [SC70]

(KS-3)

Dimensions shown in millimeters

2.00 BSC

1.25 BSC

PIN 1

1.00

0.90

0.70

0.10 MAX

3

1

0.10 COPLANARITY

2

0.65 BSC

0.30

0.15

2.10 BSC

1.10 MAX

SEATING
PLANE

0.22

0.08

0.46

0.36

0.26

–6–

REV. A

ADM809-5S/L

Revision History

Location Page

3/03—Data Sheet changed from REV. 0 to REV. A.

Added SC70 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal

Changes to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Changes to Table I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Changes to TPC 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

REV. A

–7–

C00090–0–3/03(A)

–8–