EC9509C/ 08C|BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR

EC9509C/ 08C|BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR


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BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

Introduction

(General​​ Description)

The​​ EC9509C​​ /​​ 08C​​ Series​​ is​​ a​​ high-precision voltage detector developed using CMOS process. The detection voltage is fixed internally​​ with​​ an​​ accuracy​​ of​​ ±2.0​​ %.​​ A time delayed reset​​ can be accomplished with​​ the addition of an external capacitor.​​ Two output forms,​​ N-channel open-drain and CMOS output, are available.

 

 

 

 

Features

Ultra-low​​ current​​ consumption

 

High-precision​​ detection​​ voltage​​ ±2.0​​ %

 

COperating​​ voltage​​ range​​ 2.0​​ V​​ to​​ 6.0​​ V

 

Detection​​ voltage​​ 2.2​​ V​​ to​​ 3.1​​ V​​ (0.1​​ V​​ step)

 

Hysteresis​​ characteristics​​ 5​​ %​​ typ.

 

Two​​ output​​ forms:​​ CMOS​​ output​​ active​​ “L”​​ Open-drain output​​ active​​ “L”

SOT-23-5

Pin No

SOT343

Pin No

SYMBOL

DESCRITION

1

​​ 4

OUT

VOLTAGE​​ DETECTION​​ PIN

2

​​ 2

VDD

VOLTAGE​​ INPUT​​ PIN

3

​​ 1

VSS

GROUND​​ PIN

4

​​ ---

N.C

NO​​ CONNECTION

 

5

 

​​ 3

 

CD

CONNECTION PIN DELAY CAPACITOR

 

 

Applications

  • Power​​ supply​​ monitor​​ for​​ portable​​ equipment such​​ as​​ electronic​​ organizers,​​ notebook​​ PCs, cellular​​ phones,​​ digital​​ cameras

  • Constant​​ voltage​​ power​​ monitor​​ for​​ cameras, communication​​ equipment​​ and​​ video equipment

  • Power​​ monitor​​ and​​ reset​​ for​​ CPUs​​ and microcomputers

 

 

 

Packages

SOT-23-5

SOT343

 

 

 

Pin Assignment

(SOT-23-5)  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ SOT343(SC82)

 

BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

Block​​ Diagrams

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CMOS​​ OUTPUTEC9509COPEN​​ DRAINEC9508C

 

 

 

Ordering​​ Information

 

 

 

 

 

 

 

 

 

 

PART​​ NUMBER

MARKING​​ ID

PACKAGE

PACKING​​ TYPE

EC9508C​​ XXB-F

08CXXF

SOT23-5

TAPE​​ / REEL

EC9508C​​ XXB-G

08CXXG

SOT23-5

TAPE​​ / REEL

EC9508CXXC4-G

XXYW

SOT343

TAPE ​​​​ / ​​ REEL

EC9509C​​ XXB-F

09CXXF

SOT23-5

TAPE​​ / REEL

EC9509C​​ XXB-G

09CXXG

SOT23-5

TAPE​​ / REEL

 

 

Package​​ Marking​​ Indication

SOT-23-5 Marking

 

MARKING​​ ID

XX:Voltage

YW:Date Code

 

 

 

 

xxxxx

LOT ​​ ​​ NO.

 

BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

Absolute​​ Maximum​​ Ratings

 

 

PARAMETER

SYMBOL

RATING

UNIT

POWER​​ SUPPLY​​ VOLTAGE

VDD​​ -​​ VSS

8

V

CD​​ PIN​​ INPUT​​ VOLTAGE

VCD

VSS​​ -0.3​​ TO​​ VDD​​ +0.3

V

OUTPUT​​ VOLTAGE

VOUT

VSS​​ -0.3​​ TO​​ VDD​​ +0.3

V

OUTPUT​​ CURRENT

IOUT

4

mA

POWER​​ DISSIPATION

PD

SOT23 -5

500

mW

SOT343

250

mW

OPERATING​​ TEMPERATURE

TOPR

-40​​ TO​​ +85

STORAGE​​ TEMPERATURE

TSTG

-40​​ TO​​ +125

JUNCTION​​ TEMPERATURE

Tj(max)

150

JUNCTION​​ TO​​ AMBIENT​​ THERMAL​​ RESISTANCE

θja

347

/W

JUNCTION​​ TO​​ CASE​​ THERMAL​​ RESISTANCE

θjc

148

/W

 

 

 

 

 

Electrical​​ Characteristics

CMOS​​ output​​ products (Ta=25°C​​ unless otherwise specified)

 

 

 

Parameter

 

 

Symbol

 

 

Conditions

 

 

Min

 

 

Typ

 

 

Max

 

 

Unit

 

Test circuit

 

Detection voltage

 

-VDET

 

--

-VDET(S)

 

X 0.98

 

-VDET

-VDET(S)

 

X 1.02

 

V

 

1

 

Hysteresis width

 

VHYS

 

--

-VDET

 

X0.03

-VDET

 

X0.05

-VDET

 

X0.08

 

V

 

1

Current consumption

ISS

VDD=4V

--

4.5

6.5

uA

2

Operating voltage

VDD

--

2.0

--

6.0

V

1

 

 

 

Output Current of output transistor

 

 

 

IOUT

N-channel VDS=0.5V

 

VDD=​​ 2.4V

 

2.88

 

4.98

 

--

 

mA

 

3

P-channel VDS=VDD-0.5V

 

VDD=4.8​​ V

 

1.43

 

2.39

 

--

 

mA

 

5

 

Delay time

 

td

 

CD=4.7nF

 

VDD=3V

 

6

 

13

 

20

 

ms

 

4

 

BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

Test​​ circuit

 

 

1. 2.

 

 

 

 

 

 

3. 4.

 

 

 

 

 

 

 

5.

 

BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

Timing chart

 

 

1.​​ CMOS​​ active​​ low output

 

 

 

 

2.​​ Nch​​ open-drain​​ active​​ low output

 

 

 

NoteFor values of VDD less than minimum operating voltage, values of​​ OUT​​ terminal output is free of the shaded region.

 

BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

Definition​​ of​​ Technical​​ Terms

1.​​ Detection​​ voltage​​ (-VDET)

 

Detection​​ voltage​​ -VDET​​ is​​ a​​ voltage​​ at​​ which​​ the​​ output​​ turns​​ to​​ low.​​ This​​ detection​​ voltage​​ varies​​ slightly​​ among products​​ of​​ the​​ same​​ specification.​​ The​​ variation​​ of​​ detection​​ voltage​​ between​​ the​​ specified​​ minimum​​ [(-VDET)​​ min.] and maximum [(-VDET)​​ max.] is called the detection voltage range​​ (See Figure​​ A).

2.​​ Release​​ voltage​​ (+VDET)

 

Release​​ voltage​​ +VDET​​ is​​ a​​ voltage​​ at​​ which​​ the​​ output​​ turns​​ to​​ high.​​ This​​ release​​ voltage​​ varies​​ slightly​​ among products of the same specification. The​​ variation​​ of release voltage​​ between the​​ specified minimum [(+VDET)​​ min.]​​ and maximum [(+VDET)​​ max.] is called the release voltage range (See B).

 

FIGURE​​ A FIGURE​​ B

 

3.​​ Hysteresis​​ width​​ (VHYS)

 

Hysteresis​​ width​​ is​​ the​​ voltage​​ difference​​ between​​ the​​ detection​​ voltage​​ and​​ the​​ release​​ voltage.​​ The​​ existence​​ of the hysteresis width avoids malfunction​​ caused by​​ noise​​ on input​​ signal.

4.​​ Delay​​ time​​ (td)

 

Delay​​ time​​ is​​ a​​ time​​ internally​​ measured​​ from​​ the​​ instant​​ at​​ which​​ VDD​​ pin​​ exceeds​​ the​​ release​​ voltage​​ (+VDET)​​ to​​ the​​ point​​ at which​​ the​​ output​​ of​​ the​​ OUT pin​​ inverts.​​ The​​ delay​​ time​​ changes​​ according​​ to​​ the external capacitor CD.

 

BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

 

 

5.​​ Short-circuit​​ current

 

Short-circuit current refers​​ to the current which flows​​ instantaneously at the time​​ of detection​​ and release of a voltage​​ detector.​​ Short-circuit​​ current​​ is​​ large​​ in​​ CMOS​​ output​​ products,​​ and​​ small​​ in​​ N​​ channel​​ open-drain​​ output products.

 

 

6.​​ Oscillation

 

In applications where a​​ resistor is​​ connected to the voltage detector input as shown in Figure ,​​ taking a CMOS active low​​ product for example, the short-circuit current, which flows​​ at release when the output​​ goes from low to high, causes​​ a voltage drop equal to [short-circuit current]​​ ×​​ [input resistance] across the resistor. When the​​ input voltage falls​​ below the​​ detection voltage​​ -VDET​​ as a result,​​ the output voltage​​ goes to low level. In this state, the short-circuit current stops​​ and its resultant voltage drop disappears, and​​ the output goes from low to high.

Short-circuit​​ current​​ again​​ starts​​ flowing,​​ a​​ voltage​​ drop​​ appears,​​ and​​ oscillation​​ is​​ finally​​ induced​​ by​​ repeating​​ the process.

Following is​​ an example for bad implementation: input voltage divider for a CMOS output product.

 

 

 

 

Standard Circuit

 

 

 

 

BUILT-IN​​ DELAY​​ CIRCUIT

HIGH-PRECISION​​ VOLTAGE​​ DETECTOR

EC9509C/​​ 08C

 

Application​​ Circuit​​ Examples

 

 

1. Microcomputer​​ reset​​ circuits

 

 

With the EC9509CXX Series which has a low operating voltage, a high-precision detection voltage and hysteresis characteristic,​​ the reset​​ circuits​​ shown​​ in Figures A to B can be​​ easily constructed.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Nch open-drain output products only) Figures A Figures B

 

2.​​ Change​​ of​​ detection voltage