Analog Devices ADM6384 prd Datasheet

Microprocessor Supervisory

Preliminary Technical Data

FEATURES

Precision 1.8V to 5V Power Supply Monitoring
31 Reset Threshold Options:

1.58V to 5.0V
Four Reset Timeouts:
1ms, 20ms, 140ms, 1120ms
Manual Reset Input
Reset Output Stage- Push-Pull Active-Low
Guaranteed Reset Output valid to V
Power Supply Glitch Immunity
Specified Over -40°C to +125°C Temperature Range
4-Lead SC70 Package

APPLICATIONS

Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable Equipment

GENERAL DESCRIPTION

The ADM6384 is a supervisory circuit which monitors power
supply voltage levels in microprocessor-based systems. A
power-on-reset signal is generated when the supply voltage rises
to a preset threshold level. The ADM6384’s debounced manual
reset input can be used to initiate a reset by means of an
external push-button or logic signal.

The part is available in a choice of the following 31 reset
threshold options, from 1.58V to 5.0V. The minimum reset
timeout periods are 1ms, 20ms, 140ms and 1120ms.

The ADM6384 is available in a 4-lead SC70 package and
typically consumes only 7µA, making it suitable for use in low
power portable applications

CC

=1V

Circuit in 4-Lead SC70

ADM6384

FUNCTIONAL BLOCK DIAGRAM

ADM6384

V

CC

MR

V

REF

DEBOUNCE

ADM6384

MR

Figure 1. Typical ADM6384 Operating Circuit

V

CC

GND

RESET

GENERATOR

RESET

100K

RESET

GND

V

CC

MICROPROCESSOR

SYSTEM

RESET

GND

Rev. PrD

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registered trademarks are the property of their respective companies.

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Tel: [phone]
Fax: [phone] © 2005 Analog Devices, Inc. All rights reserved.

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ADM6384 Preliminary Technical Data

ADM6384—SPECIFICATIONS

Table 1. VCC=Full Operating Range, TA=-40oC to 125oC, unless otherwise noted

Parameter Min Typ Max Units Test Conditions/Comments

SUPPLY
VCC Operating Voltage Range 1 5.5 V

Supply Current 7 13 µA VCC=5.5V, no load
6 11 µA VCC=3.6V, no load
4 7 µA VCC=2.5V, no load1
3 6 µA VCC=1.8V, no load1

RESET THRESHOLD VOLTAGE

ADM6384_50_
ADM6384_49_ 4.78 4.90 5.02 V
ADM6384_48_
ADM6384_47_ 4.58 4.70 4.82 V
ADM6384_46_
ADM6384_45_ 4.39 4.5 4.61 V
ADM6384_44_
ADM6384_43_ 4.19 4.30 4.41 V
ADM6384_42_ 4.1 4.2 4.31 V
ADM6384_41_ 4.0 4.1 4.2 V
ADM6384_40_ 3.9 4.0 4.1 V
ADM6384_39_ 3.8 3.9 4.0 V
ADM6384_38_ 3.71 3.8 3.9 V
ADM6384_37_ 3.61 3.7 3.79 V
ADM6384_36_ 3.51 3.6 3.69 V
ADM6384_35_ 3.41 3.5 3.59 V
ADM6384_34_ 3.32 3.4 3.49 V
ADM6384_33_ 3.22 3.3 3.38 V
ADM6384_32_ 3.12 3.2 3.28 V
ADM6384_31_
ADM6384_30_ 2.93 3.0 3.08 V
ADM6384_29_
ADM6384_28_ 2.73 2.8 2.87 V
ADM6384_27_ 2.63 2.70 2.77 V
ADM6384_26_
ADM6384_25_ 2.44 2.5 2.56 V
ADM6384_24_ 2.34 2.4 2.46 V
ADM6384_23_
ADM6384_22_
ADM6384_17_

ADM6384_16_
RESET THRESHOLD TEMPERATURE COEFFICIENT 40 ppm/°C
RESET THRESHOLD HYSTERESIS 3 mV
RESET TIMEOUT PERIOD

ADM6384_ _D1 1 2 ms

ADM6384_ _D2 20 40 ms

ADM6384_ _D3 140 280 ms

ADM6384_ _D4 1120 2240 ms

VCC to RESET DELAY
RESET

Output Voltage

VOL 0.3 V VCC>=1.0V, I

0.3 V VCC>=2.5V, I

4.88 5.00 5.12 V

4.68 4.80 4.92 V

4.51 4.63 4.74 V

4.27 4.38 4.48 V

3.00 3.08 3.15 V

2.85 2.93 3.00 V

2.56 2.63 2.69 V

2.26 2.31 2.37 V

2.13 2.19 2.24 V

1.62 1.67 1.71 V

1.54 1.58 1.61 V

35 µs V

falling at 10mV/µs

CC

=80µA

SINK

=1.2mA

SINK

Rev. PrD | Page 2 of 10

Preliminary Technical Data ADM6384

Parameter Min Typ Max Units Test Conditions/Comments

0.4 V VCC>=4.5V, I
VOH 0.8x VCC V VCC>=2.5V, I

0.8x VCC V VCC>=4.5V, I
RESET

Rise Time

MANUAL RESET INPUT
MR Input Threshold

VIL 0.3xVCC V VCC <4V

0.8 V VCC <4V
VIH 0.7xVCC V VCC >4V

2.4 V VCC >4V
MR Input Pulse Width
MR Glitch Rejection
MR Pull-up Resistance
MR to Reset Delay

1

T

= 25oC Only

A

5 25 ns

1 µs

100 ns

32 63 100

200 ns

k⍀

From 10% to 90% V

=3.3V

V

CC

=3.2mA

SINK

SOURCE

SOURCE

=500µA

=800µA

, CL=5pF,

CC

ABSOLUTE MAXIMUM RATINGS

Table 2. TA = 25°C unless otherwise noted.

Parameter Rating
VCC -0.3V to +6V
RESET

Output Current (
Operating Temperature Range -40°C to +125°C
Storage Temperature Range -65°C to +150°C

θJA Thermal Impedance, SC70

Lead Temperature
Soldering (10 sec) 300°C
Vapour Phase (60 sec) 215°C
Infrared (15 sec) 220°C

RESET

)

-0.3V to +6V
20mA

146°C/W

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

Rev. PrD | Page 3 of 10

ADM6384 Preliminary Technical Data

PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

1

ADM6384

TOP VIEW

(Not to Scale)

RESET

Table 3. Pin Functional Descriptions

Pin No. Name Description

1 GND Ground
2

3

4 VCC Power Supply Voltage being Monitored.

RESET

MR

Active-Low Reset Output, which is asserted whenever V
Push-Pull Output Stage.
Manual Reset Input. This is an active-low input which, when forced low for at least 1µs,

generates a reset.
Features a 52k⍀ internal pull-up.

2

Pin Configuration

V

4GND

CC

3

MR

is below the reset.threshold, VTH.

CC

ESD 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 this product 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. PrD | Page 4 of 10

ADM6384 Preliminary Technical Data

TYPICAL PERFORMANCE CHARACTERISTICS

10.0

9.5

9.0

8.5
VCC = 5V

8.0

7.5

7.0

(µA)

6.5

CC

I

6.0

5.5

5.0

4.5

4.0

3.5

VCC = 3V

VCC = 1.5V

–40–200 20406080

TEMPERATURE (°C)

Figure 2. Supply Current vs. Temperature

04533-0-006

100

90

80

70

60

50

40

30

TO RESET DELAY (µs)

CC

V

20

10

0

–40 40200–20 60 80

Figure 5. V

Falling to Reset Propagation Delay vs. Temperature

CC

TEMPERATURE (°C)

04533-0-009

80
75
70
65
60
55
50
45
40

(µA)

35

CC

I

30
25
20
15
10

5
0

VCC (V)

Figure 3. Supply Current vs. Supply Voltage

1.05

1.04

1.03

1.02

1.01

1.00

0.99

0.98

0.97

NORMALIZED RESET THRESHOLD

0.96

0.95
–40 40200–20 60 80

TEMPERATURE (°C)

Figure 4. Normalized Reset Threshold vs. Temperature

340
320
300
280
260
240
220
200
180
160
140

MANUAL RESET TO RESET DELAY (ns)

120
100

5.50 2.01.51.00.5 2.5 3.0 3.5 4.0 4.5 5.0

04533-0-007

04533-0-008

–40 40200–20 60 80

TEMPERATURE (°C)

Figure 6. Manual Reset to Reset Propagation Delay vs. Temperature

1.20

1.15

1.10

1.05

1.00

0.95

0.90

NORMALIZED RESET TIMEOUT

0.85

0.80
–40 40200–20 60 80

TEMPERATURE (°C)

04533-0-010

04533-0-011

Figure 7. Normalized Reset Timeout Period vs. Temperature

Rev. PrD | Page 5 of 10

ADM6384 Preliminary Technical Data

160

140

120

100

80

60

40

20

MAXIMUM TRANSIENT DURATION (µs)

VTH = 4.63V

VTH = 2.93V

0

Figure 8. Maximu m V

RESET OCCURS ABOVE CURVE

OVER DRIVE VOD (mV)

Transient Duration vs. Reset Threshold Overdrive

CC

100010 100

04533-0-013

190

180

170

160

150

140

130

120

MR MINIMUM PULSE WIDTH (ns)

110

100

–50 0 50

TEMPERATURE (°C)

Figure 9. Manual Reset Minimum Pulse Width vs. Temperature

04533-0-014

Rev. PrD | Page 6 of 10

ADM6384 Preliminary Technical Data

CIRCUIT DESCRIPTION

The ADM6384 provides microprocessor supply voltage
supervision by controlling the microprocessor’s reset input.
Code execution errors are avoided during power-up, power­down, and brownout conditions by asserting a reset signal when
the supply voltage is below a preset threshold and by allowing
supply voltage stabilization with a fixed-timeout reset pulse
after the supply voltage rises above the threshold. If the user
detects a problem with the system’s operation, a manual reset
input is available to reset the microprocessor by means of an
external push-button, for example.

RESET OUTPUT

The ADM6384 features an active-low, push-pull reset output.
The reset signal is guaranteed to be logic low for V
1V.

down to

CC

The reset output is asserted when V
threshold (V

) or when MR is driven low. Reset remains

TH

asserted for the duration of the reset active timeout period (t
after V

rises above the reset threshold or after MR transitions

CC

is below the reset

CC

)

RP

from low-to-high. Figure 10 illustrates the behavior of the reset
outputs.

V

V

CC

RESET

CC

1V
0V

V

CC

0V

Figure 10. Reset Timing Diagram

V

TH

t

RP

V

TH

t

RD

MANUAL RESET INPUT

The ADM6384 features a manual reset input (MR) which, when

MR

driven low, asserts the reset output. When
low to high, reset remains asserted for the duration of the reset
active timeout period before deasserting. The
kΩ internal pull-up so that the input is always high when
unconnected. An external push-button switch can be connected
between

MR

and ground so that the user can generate a reset.
Debounce circuitry for this purpose is integrated on-chip. Noise
immunity is provided on the

MR

input, and fast, negative-going
transients of up to 100 ns (typ) are ignored. A 0.1 µF capacitor
between

MR

and ground provides additional noise immunity.

transitions from

MR

input has a 52

Rev. PrD | Page 7 of 10

ADM6384 Preliminary Technical Data

APPLICATION INFORMATION

NEGATIVE-GOING VCC TRANSIENTS

To avoid unnecessary resets caused by fast power supply
transients, the ADM6384 is equipped with glitch rejection
circuitry. The typical performance characteristic in Figure 8
plots V
curves show combinations of transient magnitude and duration
for which a reset is not generated for 4.63 V and 2.93 V reset
threshold parts. For example, with the 2.93 V threshold, a
transient that goes 100 mV below the threshold and lasts 8 µs
typically does not cause a reset, but if the transient is any bigger
in magnitude or duration, a reset is generated. An optional 0.1
µF bypass capacitor mounted close to V
glitch rejection.

ENSURING RESET VALID TO VCC= 0 V

Both active-low and active-high reset outputs are guaranteed to
be valid for V
resistor with push-pull configured reset outputs, valid outputs
for V
a resistor connected between
output low when it is unable to sink current. For the active-high
case, a resistor connected between RESET and V
output high when it is unable to source current. A large
resistance such as 100 kΩ should be used so that it does not
overload the reset output when V

transient duration versus the transient magnitude. The

CC

provides additional

CC

as low as 1 V. However, by using an external

CC

as low as 0 V are possible. For an active-low reset output,

CC

RESET

and ground pulls the

pulls the

CC

is above 1 V.

CC

V

CC

ADM6384

Figure 11. Ensuring Reset Valid to V

RESET

100k⍀

GND

CC

= 0 V

Rev. PrD | Page 8 of 10

Preliminary Technical Data ADM6384

OUTLINE DIMENSIONS

2.20

1.35

1.15

PIN 1

0.65 BSC

1.80

4 3

1

2

0.50 BSC

2.40

1.80

1.00

0.80

0.10 MAX

0.30

0.15

0.10 COPLANARITY

PACKAGE OUTLINE CORRESPONDS IN FULL TO EIAJ SC82

EXCEPT FOR WIDTH OF PIN-2 AS SHOWN

Figure 2. 4-Lead Plastic Surface Mount Package [SC70]

Dimensions shown in millimeters

0.70

0.50

1.10

0.80

SEATING
PLANE

(KS-4)

0.18

0.10

0.30

0.10

Rev. PrC | Page 9 of 10

ADM6384 Preliminary Technical Data

blank

ORDERING GUIDE
Table 1. ADM6384 Ordering Guide

ADM6384YKS__D_-RL7

GENERIC NUMBER

TEMPERATURE RANGE

Y: -40oC TO +125oC

PACKAGE CODE

KS: 4-LEAD SC70

ORDERING QUANTITY
RL7: 3,000 PIECE REEL

RESET TIMEOUT PERIOD
1: 1ms (min)
2: 20ms (min)
3: 140ms (min)
4: 1120ms (min)

RESET THRESHOLD NUMBER
(16 TO 50)

Figure 2. Ordering Code Structure

1,2

Model

ADM6384YKS29D1-R7 2.93 1 –40°C to +125°C 3k SC70-4 N0J
ADM6384YKS23D3-R7 2.31 140 –40°C to +125°C 3k SC70-4 N0J
ADM6384YKS26D3-R7 2.63 140 –40°C to +125°C 3k SC70-4 N0J
ADM6384YKS29D3-R7 2.93 140 –40°C to +125°C 3k SC70-4 N0J

2

1

Complete the ordering code by inserting reset timeout, and reset threshold suffixes from Table 1.

2

Contact Sales for the availability of nonstandard models.

© 2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective companies.
Printed in the U.S.A.

Reset

Threshold (V)

PR05305-0-3/05(PrD)

Reset Timeout
(ms)

Temperature
Range

Quantity Package

Type

Branding

Rev. PrD | Page 10 of 10