Datasheet HT7022A Datasheet (Holtek Semiconductor Inc)

Features

·

Low power consumption

·

Low temperature coefficient

·

Built-in high-stability reference source

Applications

·

Battery checkers

·

Level selectors

·

Power failure detectors

General Description

The HT70XX series is a set of three-terminal low power
voltage detectors implemented in CMOS technology.
Each voltage detector in the series detects a particular
fixed voltage ranging from 2.2V to 7V. The voltage de
tectors consist of a high-precision and low power con
sumption standard voltage source, a comparator,
hysteresis circuit, and an output driver. CMOS technol
ogy ensures low power consumption.

HT70XX

Voltage Detector

·

Built-in hysteresis characteristic

·

TO-92 & SOT-89 package

·

Microcomputer reset

·

Battery memory backup

·

Non-volatile RAM signal storage protectors

Although designed primarily as fixed voltage detectors,
these devices can be used with external components to
detect user specified threshold voltages (NMOS open
drain type only).

-

-

-

Selection Table

Part No. Detectable Voltage Hysteresis Width Tolerance

HT7022A

HT7024A

HT7027A

HT7033A

HT7039A

HT7044A

HT7050A

HT7070A

Note: The output type selection codes are:

NMOS open drain normal open, active low

For example: The HT7070A is a 7.0V, NMOS open drain active low output

Output type selection table

Type

V

OUT

A Hi-Z VSS

2.2V 0.11V

2.4V 0.12V

2.7V 0.135V

3.3V 0.165V

3.9V 0.195V

4.4V 0.22V

5.0V 0.25V

7.0V 0.35V

V

DD

VDD>V

DET

(+) VDD£V

DET

±5%

±5%

±5%

±5%

±5%

±5%

±5%

±5%

(-)

Rev. 1.60 1 January 14, 2003

Block Diagram

N channel open drain output (normal open; active low)

HT70XX

A type

VDD

GND

VOUT

V

REF

V

OUT

V

DET

V

HYS

V

IN

Pin Assignment

T O - 9 2

H T 7 0 X X

O U T V D D V S S

Rev. 1.60 2 January 14, 2003

F r o n t V i e w

B o t t o m V i e w

S O T - 8 9

O U T V D D V S S

HT70XX

Pad Assignment

HT70XX (except HT7022A)

( 0 , 0 )

1

2

V O U T

V I N

Chip size: 1317 ´ 1158 (mm)

* The IC substrate should be connected to VDD in the

PCB layout artwork.

HT7022A only

O U T

1

( 0 , 0 )

3

G N D

2

V D D

2

V S S

3

Pad Coordinates

HT70XX (except HT7022A)

Pad No. X Y

1

2

3 443.90

HT7022A only

Pad No. X Y

1

2 120.65 461.01

3 774.70 412.75

-483.30 -379.50

-234.60 -399.50

-434.34

Unit: mm

-386.00

Unit: mm

394.97

Chip size: 2032 ´ 1321 (mm)

2

* The IC substrate should be connected to VDD in the

PCB layout artwork.

Absolute Maximum Ratings

Supply Voltage, except HT7022A..................................................................................................VSS-0.3V toVSS+26V

Supply Voltage, HT7022A only....................................................................................................................-0.3V to13V

Output Voltage...........................V

Storage Temperature ............................-50°Cto125°C Power Consumption ..........................................200mW

Operating Temperature...............................0°Cto70°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil
ity.

-0.3V to VDD+0.3V Output Current......................................................50mA

SS

-

Rev. 1.60 3 January 14, 2003

Electrical Characteristics

HT7022A

HT70XX

Ta=25°C

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 3.2V No load

Operating Voltage

Output Sink Current 2V

Temperature Coefficient

a

HT7024A

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 8V No load

Operating Voltage

Output Sink Current 2V

Temperature Coefficient

a

Test Conditions

DD

Conditions

V

Min. Typ. Max. Unit

2.09 2.2 2.31 V

2.132 2.31 2.541 V

¾¾

¾¾

=0.2V

V

OUT

0.02

V

DET

¾

1.6

0.5 1

0.05

V

DET

1.8 4

¾

0.1

V

DET

12 V

¾

mA

mA

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

Ta=25°C

Test Conditions

DD

Conditions

V

Min. Typ. Max. Unit

2.28 2.4 2.52 V

2.325 2.52 2.772 V

¾¾

¾¾

=0.2V

V

OUT

0.02

V

DET

¾

1.5

0.5 1

0.05

V

DET

47

¾

0.1

V

DET

24 V

¾

mA

mA

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

V

V

HT7027A

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 8V No load

Operating Voltage

Output Sink Current 2V

Temperature Coefficient

a

Test Conditions

DD

Conditions

V

Min. Typ. Max. Unit

2.565 2.7 2.835 V

2.616 2.835 3.118 V

¾¾

¾¾

=0.2V

V

OUT

0.02

V

DET

¾

1.5

0.5 1

0.05

V

DET

V

47

¾

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

Ta=25°C

0.1

DET

24 V

¾

V

mA

mA

Rev. 1.60 4 January 14, 2003

HT70XX

HT7033A

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 8V No load

Operating Voltage

Output Sink Current 2.5V

Temperature Coefficient

a

HT7039A

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 8V No load

Operating Voltage

Output Sink Current 2.5V

Temperature Coefficient

a

Ta=25°C

Test Conditions

DD

Conditions

V

Min. Typ. Max. Unit

3.135 3.3 3.465 V

3.197 3.465 3.811 V

¾¾

¾¾

=0.25V

V

OUT

0.02

V

DET

V

¾

1.5

1.2 2.5

0.05

DET

47

¾

0.1

V

DET

24 V

¾

V

mA

mA

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

Ta=25°C

Test Conditions

DD

Conditions

V

Min. Typ. Max. Unit

3.705 3.9 4.095 V

3.779 4.095 4.504 V

¾¾

¾¾

=0.25V

V

OUT

0.02

V

DET

V

¾

1.5

1.2 2.5

0.05

DET

47

¾

0.1

V

DET

24 V

¾

V

mA

mA

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

HT7044A

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 8V No load

Operating Voltage

Output Sink Current 3.6V

Temperature Coefficient

a

Test Conditions

DD

Conditions

V

Min. Typ. Max. Unit

4.18 4.4 4.62 V

4.263 4.62 5.082 V

¾¾

¾¾

=0.36V

V

OUT

0.02

V

DET

¾

1.5

0.05

V

DET

47

¾

36

0.1

V

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

Ta=25°C

DET

24 V

¾

mA

V

mA

Rev. 1.60 5 January 14, 2003

HT70XX

HT7050A

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 8V No load

Operating Voltage

Output Sink Current 3.6V

Temperature Coefficient

a

HT7070A

Symbol Parameter

V

V

I

DD

V

I

OL

DDV

DET

HYS

DD

DET

T

Hi®Lo Detectable Voltage ¾¾

Lo®Hi Detectable Voltage ¾¾

Hysteresis Width

Operating Current 8V No load

Operating Voltage

Output Sink Current 5V

Temperature Coefficient

a

Ta=25°C

Test Conditions

V

DD

Conditions

Min. Typ. Max. Unit

4.75 5 5.25 V

4.845 5.25 5.775 V

¾¾

¾¾

=0.36V

V

OUT

0.02

V

DET

¾

2.1

0.05

V

DET

47

¾

36

0.1

V

DET

24 V

¾

V

mA

mA

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

Ta=25°C

Test Conditions

V

DD

Conditions

Min. Typ. Max. Unit

6.65 7 7.35 V

6.783 7.35 8.085 V

¾¾

¾¾

=0.5V

V

OUT

0.02

V

DET

¾

2.1

0.05

V

DET

47

¾

510

0.1

V

DET

24 V

¾

V

mA

mA

¾ 0°C<Ta<70°C ¾±0.9 ¾ mV/°C

Functional Description

The HT70XX series is a set of voltage detectors
equipped with a high stability voltage reference which is

connected to the negative input of a comparator¾ de
noted as V

in the following figure for NMOS output

REF

voltage detector.

When the voltage drop to the positive input of the com
parator (i,e,V

M1 turns off, and V
(R

B+RC

falls to a value less than V
verts from high to low, V

) is higher than V

B

is expressed as VBH=VDD´

B

)/(RA+RB+RC). If VDDis decreased so that V

REF

OUT

turns on, RC is bypassed, and V

V

BL=VDD´RB

/(RA+RB), which is less than V

, VOUT goes high,

REF

, the comparator output in

goes low, VCis high, M1

becomes:

B

By so

BH.

doing, the comparator output will stay low to prevent the

circuit from oscillating when V

» V

B

REF.

Rev. 1.60 6 January 14, 2003

If VDDfalls below the minimum operating voltage, the
output becomesundefined. When VDD goes from low to

-

V

´ RB/(RA+RB)>V

DD

V

goes high.

OUT

, the comparator output and

REF

The detectable voltage is defined as:

­V

DET

The release voltage is defined as:

B

­V

DET

RRR

ABC

(-)=

RR

AB

(+) =

++

RR

+

BC

+

´ V

R

B

REF

´ V

REF

The hysteresis width is:

V

HYS=VDET

(+) - V

DET

(-)

The figure demonstrates the NMOS output type with
positive output polarity (V

is normally open, active

OUT

low). The HT70XX series also supplies options for other
output types with active high outputs. Application cir
cuits shown are examples of positive output polarity
(normally open, active low) unless otherwise specified.

Application Circuits

Microcomputer reset circuit

Normally a reset circuit is required to protect the micro
computer system from malfunctions due to power line
interruptions. The following examples show how differ
ent output configurations perform a reset function in var
ious systems.

·

NMOS open drain output application for separate
power supply

V

D D 1

H T 7 0 X X A

V

O U T

R E S E T

M i c r o ­c o m p u t e r

V

D D 2

V

S S

R

A

C o m p a r a t o r

V

V

B

C

-

V

R E F

R

B

M 1

R

C

NMOS output voltage detector (HT70XXA)

Power-on reset circuit

With several external components, the NMOS open

­drain type of the HT70XX series can be used to perform
a power-on reset function as shown:

-

-

V

I N

R

C

D

V

D D

V

O U T

H T 7 0 4 4 A

V

S S

V

D D

HT70XX

V

D D

R L

V

O U T

M N

V

S S

V

O U T

V

S S

·

NMOS open drain output application with R-C delay

V

D D

R

H T 7 0 X X A

V

O U T

M i c r o ­c o m p u t e r

t

V

O U T

C

V

S S

Rev. 1.60 7 January 14, 2003

5V power line monitoring circuit

T

Generally, a minimum operating voltage of 4.5V is guar
anteed in a 5V power line system. The HT7044A is rec
ommended for use as 5V power line monitoring circuit.

·

5V power line monitor with power-on reset

5 V P o w e r l i n e

R

D

HT70XX

·

Varying the detectable voltage with a diode

V

-

-

I N

V f 1

V f 2

V

D D

V

O U T

H T 7 0 X X A

V

D D

C

V

O U

H T 7 0 4 4 A

V

S S

·

with 5V voltage regulator

V

S S

5 V V o l t a g e r e g u l a t o r

V

I N

H T 7 1 5 0

5 V

G N D

V

D D

V

O U T

H T 7 0 4 4 A

V

S S

Change of detectable voltage

If the required voltage is not found in the standard prod­uct selection table, it is possible to change it by using ex­ternal resistance dividers or diodes.

·

Varying the detectable voltage with a resistance di
vider

V

I N

V

S S

Detectable Voltage = Vf1+Vf2+V

Malfunction analysis

The following circuit demonstrates the way a circuit ana
lyzes malfunctions by monitoring the variation or spike
noise of power supply voltage.

V

O U T

H T 7 0 X X A

V

S S

Charge monitoring circuit

The following circuit shows a charged monitor for pro­tection against battery deterioration by overcharging.
When the voltage of the battery is higher than the set de­tectable voltage, the transistor turns on to bypass the
charge current, protecting the battery from overcharg­ing.

V

-

S o l a r
C e l l

T r

V

D D

O U T

B A T T

DET

V

V

D D

S S

L o a d

V

S S

-

R

A

R

B

V

S S

Detectable voltage =

Hysteresis width =

RR

AB

+

R

B

RR

AB

+

R

B

V

D D

H T 7 0 X X A

´ V

DET

´ V

HYS

V

O U T

V

S S

V

S S

H T 7 0 X X A

Rev. 1.60 8 January 14, 2003

Level selector

The following diagram illustrates a logic level selector.

V D D

HT70XX

V S S

5 . 0 V

3 . 9 V

V D D

V D E T 1

V D E T 2

O U T

V O U T

H T 7 0 3 9 A

V O U T

O U T

H T 7 0 5 0 A

V D E T 1V D E T 2

t

t

Rev. 1.60 9 January 14, 2003

Package Information

3-pin TO-92 outline dimensions

HT70XX

A

B

D

C

E

F

G

H

Symbol

Min. Nom. Max.

A 170

B 170

C 500

D11

E90

F45

G45

H 130

I8

Dimensions in mil

¾

¾

¾¾

¾

¾

¾

¾

¾

¾

a 4°¾6°

200

200

20

110

55

65

160

18

Rev. 1.60 10 January 14, 2003

3-pin SOT-89 outline dimensions

HT70XX

A

B

E

G

F

Symbol

H

Dimensions in mil

Min. Nom. Max.

A 173

B64

C90

D35

E 155

F14

G17

H

¾

I55

J14

I

J

C

D

¾

¾

¾

¾

¾

¾

¾

59

¾

¾

181

72

102

47

167

19

22

¾

63

17

Rev. 1.60 11 January 14, 2003

Product Tape and Reel Specifications

TO-92 reel dimensions (Unit: mm)

HT70XX

P a c k a g e U p , F l a t S i d e U p

3 0

P a c k a g e U p , F l a t S i d e D o w n

5 8

8 8

3 6 0

4 3

Rev. 1.60 12 January 14, 2003

SOT-89 reel dimensions

HT70XX

T 2

A

B

T 1

D

SOT-89

Symbol Description Dimensions in mm

A Reel Outer Diameter

B Reel Inner Diameter

180±1.0

62±1.5

C Spindle Hole Diameter 12.75+0.15

D Key Slit Width

1.9±0.15

T1 Space Between Flange 12.4+0.2

T2 Reel Thickness

17-0.4

C

Rev. 1.60 13 January 14, 2003

TO-92 carrier tape dimensions

HT70XX

P

H 1

H

H 0

F 1 F 2

P 2

P 0

l 1

D 0

TO-92

Symbol Description Dimensions in mm

I1 Taped Lead Length (2.5)

P Component Pitch

P

P

F

F

Dh

0

2

1

2

Perforation Pitch

Component to Perforation (Length Direction)

Lead Spread

Lead Spread

Component Alignment

W Carrier Tape Width

W

W

W

H

0

H

1

D

0

Hold-down Tape Width

0

Perforation Position

1

Hold-down Tape Position (0.5)

2

Lead Clinch Height

Component Height Less than 24.7

Perforation Diameter

t Taped Lead Thickness

H Component Base Height

Note:

Thickness less than 0.38±0.05mm~0.5mm

12.7±1.0

12.7±0.3

6.35±0.4

2.5+0.4

2.5+0.4

0±0.1

18.0+1.0

6.0±0.5

9.0±0.5

16.0±0.5

4.0±0.2

0.7±0.2

19.0±0.5

P0 Accumulated pitch tolerance: ±1mm/20pitches.

( ) Bracketed figures are for consultation only

-0.1

-0.1

-0.5

h

,

W 2

W 0

W 1

W

t

Rev. 1.60 14 January 14, 2003

SOT-89 carrier tape dimensions

HT70XX

D

E

F

PD 1

P 1P 0

W

A 0

B 0

C

SOT-89

Symbol Description Dimensions in mm

W Carrier Tape Width

P Cavity Pitch

E Perforation Position

F Cavity to Perforation (Width Direction)

12.0+0.3

8.0±0.1

1.75±0.1

5.5±0.05

D Perforation Diameter 1.5+0.1

D1 Cavity Hole Diameter 1.5+0.1

P0 Perforation Pitch

P1 Cavity to Perforation (Length Direction)

A0 Cavity Length

B0 Cavity Width

K0 Cavity Depth

t Carrier Tape Thickness

4.0±0.1

2.0±0.10

4.8±0.1

4.5±0.1

1.8±0.1

0.30±0.013

C Cover Tape Width 9.3

t

K 0

-0.1

Rev. 1.60 15 January 14, 2003

HT70XX

Holtek Semiconductor Inc. (Headquarters)

No.3, Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan
Tel: [phone]
Fax: [phone]
http://www.holtek.com.tw

Holtek Semiconductor Inc. (Sales Office)

11F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan
Tel: [phone]
Fax: [phone]
Fax: [phone] (International sales hotline)

Holtek Semiconductor (Shanghai) Inc.

7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China
Tel: [phone]
Fax: [phone]
http://www.holtek.com.cn

Holtek Semiconductor (Hong Kong) Ltd.

RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: [phone]
Fax: [phone]

Holmate Semiconductor, Inc.

48531 Warm Springs Boulevard, Suite 413, Fremont, CA 94539
Tel: [phone]
Fax: [phone]
http://www.holmate.com

Copyright Ó 2003 by HOLTEK SEMICONDUCTOR INC.

The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek as
sumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek reserves the right to alter its products without prior notification. For the most
up-to-date information, please visit our web site at http://www.holtek.com.tw.

-

Rev. 1.60 16 January 14, 2003