Analog Devices ADM6315 c Datasheet

Open-Drain Microprocessor

V

REF

DEBOUNCE

RESET

CIRCUITRY

ADM6315

V

CC

MR

GND

RESET

Supervisory Circuit in 4-Lead SOT-143

ADM6315

FEATURES
Specified over Temperature
Low Power Consumption (5 ␮A Typ)
Precision Voltage Monitor of Voltages from 2.5 V to 5 V

at 100 mV Increments

Reset Assertion Down to V

CC

> 1 V

Reset Timeout Periods: 1 ms, 20 ms, 140 ms,

or 1120 ms (Min)
Built-In Manual Reset
Pin Compatible with the ADM811
Available in SOT-143 Package

APPLICATIONS
Microprocessor Systems
Controllers
Intelligent Instruments
Automotive Systems
Safety Systems
Portable Instruments

GENERAL DESCRIPTION

The ADM6315 is a reliable voltage monitoring device that is
suitable for use in most voltage monitoring applications.

The ADM6315 is designed to monitor as little as a 1.8% degra­dation of a power supply voltage. Voltages that can be monitored
by the ADM6315 are all voltages (at 100 mV increments) from

2.5 V to 5 V.
Included in this circuit is a debounced manual reset input. RESET

can be activated using an ordinary switch (pulling MR low), a low
input from another digital device, or a degradation of the supply
voltage. The manual reset function is very useful, especially if the
circuit in which the ADM6315 is operating enters into a state that
can be detected only by the user. Allowing the user to manually
reset a system can reduce the damage or danger that could other­wise be caused by an out-of-control or locked-up system.

The ADM6315 comes in a cost and space efficient SOT-143
package.

FUNCTIONAL BLOCK DIAGRAM

V

CC

10k⍀

MR

ADM6315

RESET

GND

SYSTEM POWER

␮P

SYSTEM

RESET

GND

Figure 1. Typical Operating Circuit

REV. C

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ADM6315–SPECIFICATIONS

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

MIN

to T

, VCC Typ = 5 V, unless

MAX

Parameter Min Typ Max Unit Test Conditions/Comments

SUPPLY

Operating Voltage 1 5.5 V TA = –40°C to +85°C

Supply Current 5 12 µAV

V

CC

15 µAV

410 µAV

12 µAV

RESET VOLTAGE V

THRESHOLD (V

)V

TH

– 1.8% V

TH

– 2.5% V

TH

V

– 3.5% V

TH

TH

V

+ 1.8% V TA = 25°C

TH

+ 2.5% V TA = –40°C to +85°C

TH

+ 3.5% V TA = –40°C to +125°C

TH

= 5.5 V, No Load, TA = –40°C to +85°C

CC

= 5.5 V, No Load, TA = –40°C to +125°C

CC

= 3.6 V, No Load, TA = –40°C to +85°C

CC

= 3.6 V, No Load, TA = –40°C to +125°C

CC

RESET THRESHOLD
TEMPERATURE COEFFICIENT 60 ppm/°C

VCC TO RESET DELAY 35 µsV

= Falling at 1 mV/µs

CC

RESET ACTIVE TIMEOUT PERIOD

ADM6315xxD1 1 1.4 2 ms T

0.8 2.4 ms T

ADM6315xxD2 20 28 40 ms T

= –40°C to +85°C

A

= –40°C to +125°C

A

= –40°C to +85°C

A

16 48 ms TA = –40°C to +125°C

ADM6315xxD3 140 200 280 ms T

112 336 ms T

ADM6315xxD4 1120 1570 2240 ms T

= –40°C to +85°C

A

= –40°C to +125°C

A

= –40°C to +85°C

A

896 2688 ms TA = –40°C to +125°C

MANUAL RESET

Input Threshold 0.8 V V

2.4 V V

0.3 V

CC

0.7 V

CC

VV
VV

> 4 V (VIL)

TH

> 4 V (VIH)

TH

< 4 V (VIL)

TH

< 4 V (VIH)

TH

Minimum Input Pulse 1 µs
Glitch Rejection 100 ns
To Reset Delay 500 ns
Pull-Up Resistance 32 63 100 kΩ

RESET OUTPUT

Output Voltage 0.4 V V

0.3 V V

0.3 V V

Output Leakage Current 1 µAV

Specifications subject to change without notice.

CC

CC

CC

CC

> 4.25 V, I
> 2.5 V, I
> 1 V, I
> VTH, RESET De-asserted

SINK

SINK

= 3.2 mA

SINK

= 1.2 mA

= 80 µA

REV. C–2–

ADM6315

ABSOLUTE MAXIMUM RATINGS*

(TA = 25°C, unless otherwise noted.)

Terminal Voltage (With Respect to Ground)

V

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

CC

All Other Inputs . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V

Input Current

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

V

CC

Output Current

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

Power Dissipation (T

= 70°C)

A

RA-4, SOT-143

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

Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 330°C/W

␪

JA

Operating Temperature Range . . . . . . . . . . –40°C to +125°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +160°C

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

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

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

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 kV

*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 may affect device reliability.

PIN CONFIGURATION

1

GND

ADM6315

TOP VIEW

(Not to Scale)

23

RESET

4

V

CC

MR

PIN FUNCTION DESCRIPTIONS

Pin Mnemonic Function

1GND 0 V. Ground reference for all signals.
2 RESET Active Low Logic Output. RESET remains

low while V

is below the reset threshold or

CC

when MR is low; RESET then remains low
for either 1 ms (min), 20 ms (min), 140 ms
(min), or 1120 ms (min) after V

CC

rises

above the reset threshold and MR is high.

3 MR Manual Reset. This active low debounced

input will ignore input pulses of 100 ns
(typical) and is guaranteed to accept input
pulses of greater than 1 µs. Leave floating
when not used.

4V

CC

Monitored Supply Voltage.

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
ADM6315 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.

REV. C

–3–