Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Microprocessor Reset IC

Features

Precision Monitoring of +3V, +3.3V, and +5V
Power-Supply Voltages

Fully Specified Over Temperature

Available in Three Output Configurations
Push-Pull

RESET Output (G670L)

Push-Pull RESET Output (G670H)
Open-Drain RESET Output (G671L)

2ms max Power-On Reset Pulse Width

14µA Supply Current

Guaranteed Reset Valid to V

= +1V

Power Supply Transient Immunity

No External Components

3-Pin SOT-23,TO-92 and SOT-89 Packages

2% Threshold Accuracy

Applications

Computers

Controllers

Intelligent Instruments

Critical

P and µC Power Monitoring

Portable / Battery-Powered Equipment

Automotive

General Description

The G670/G671 are microprocessor (

P) supervisory

circuits used to monitor the power supplies in

P and

digital systems. They provide excellent circuit reliability
and low cost by eliminating external components and
adjustments when used with +5V, +3.3V, +3.0V- pow-
ered circuits.

These circuits perform a single function: they assert a
reset signal whenever the V

supply voltage declines

below a preset threshold. Reset thresholds suitable for
operation with a variety of supply voltages are avail-
able.

The G671L has an open-drain output stage, while the
G670 have push-pull outputs. The G671L's open-drain

RESET output requires a pull-up resistor that can be

connected to a voltage higher than V

. The G670L

have an active-low RESET output, while the G670H
has an active-high RESET output. The reset com-
parator is designed to ignore fast transients on V

and the outputs are guaranteed to be in the correct
logic state for V

down to 1V.

Low supply current makes the G670/G671 ideal for
use in portable equipment. The G670/G671 are avail-
able in 3-pin SOT-23, TO-92 and SOT-89 packages.

Pin Configuration Typical Application Circuit

RESET
INPUT

GND

VCC

RESET

(RESET)

GND

G670/G671

VCC

PULL-UP

*G671 only

SOT-23

Top View

SOT-89

TO-92

Top

View

RESET
INPUT

GND

VCC

RESET

(RESET)

GND

G670/G671

VCC

PULL-UP

*G671 only

SOT-23

Top View

SOT-89

TO-92

Top

View

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Ordering Information

ORDER NUMBER

(Pb free)

TEMP. RANGE

OUTPUT TYPE

G670LxxxTDxB G670LxxxTDxBf -40

C ~ +105

Push-Pull Active Low

G670HxxxTDxB G670HxxxTDxBf -40

C ~ +105

Push-Pull Active High

G671LxxxTDxB G671LxxxTDxBf -40

C ~ +105

C Open-Drain

G670LxxxT2xU G670LxxxT2xUf -40

C ~ +105

Push-Pull Active Low

G670HxxxT2xU G670HxxxT2xUf -40

C ~ +105

Push-Pull Active High

G671LxxxT2xU G671LxxxT2xUf -40

C ~ +105

C Open-Drain

G670LxxxT7xU G670LxxxT7xUf -40

C ~ +105

Push-Pull Active Low

G670HxxxT7xU G670HxxxT7xUf -40

C ~ +105

Push-Pull Active High

G671LxxxT7xU G671LxxxT7xUf -40

C ~ +105

C Open-Drain

Note:

U : Tape & Reel B: Bag

Order Number Identification

G67XX XXX XX X

Pin Option
Package Type
Threshold Voltage Option
Part Number

PART NUMBER

THRESHOLD VOLTAGE OPTION

G670L : Push-Pull Active Low Output

* xxx specifies the threshold voltage.

G670H : Push-Pull Active High Output

e.g. 263 denotes the 2.64V threshold voltage.

G671L : Open-Drain Output

PACKAGE TYPE

PIN OPTION

TD : TO-92

T2 : SOT-89

1 :

RESET

GND V

T7 : SOT-23

2 :

RESET

GND

3 : GND

RESET

4 : GND

RESET

5 : V

GND

RESET

6 : V

RESET

GND

*RESET for G670H

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Selector Guide

TOP MARK

ORDER NUMBER

(Pb free)

RESET

THRESHOLD (V)

OUTPUT TYPE

TO-92

G671L463TD5B G671L463TD5Bf 4.60

Open-Drain

663G

G671L438TD5B G671L438TD5Bf 4.32

Open-Drain

663F

G671L400TD5B G671L400TD5Bf 3.96

Open-Drain

663E

G671L330TD5B G671L330TD5Bf 3.30

Open-Drain

663D

G671L308TD5B G671L308TD5Bf 3.10

Open-Drain

663C

G671L293TD5B G671L293TD5Bf 2.91

Open-Drain

663B

G671L263TD5B G671L263TD5Bf

2.64 Open-Drain

663A

G670H463TD5B G670H463TD5Bf

4.60

Push-Pull

RESET

662N

G670H438TD5B G670H438TD5Bf

4.32

Push-Pull

RESET

662M

G670H400TD5B G670H400TD5Bf

3.96

Push-Pull

RESET

662L

G670H330TD5B G670H330TD5Bf

3.30

Push-Pull

RESET

662K

G670H308TD5B G670H308TD5Bf

3.10

Push-Pull

RESET

662J

G670H293TD5B G670H293TD5Bf

2.91

Push-Pull

RESET

662I

G670H263TD5B G670H263TD5Bf

2.64

Push-Pull

RESET

662H

G670L463TD5B G670L463TD5Bf

4.60

Push-Pull

662G

G670L438TD5B G670L438TD5Bf

4.32

Push-Pull

662F

G670L400TD5B G670L400TD5Bf

3.96

Push-Pull

662E

G670L330TD5B G670L330TD5Bf

3.30

Push-Pull

662D

G670L308TD5B G670L308TD5Bf

3.10

Push-Pull

662C

G670L293TD5B G670L293TD5Bf

2.91

Push-Pull

662B

G670L263TD5B G670L263TD5Bf

2.64

Push-Pull

662A

Note: TD: TO-92
Not all product options are ready for mass production, please contact factory for availability.

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Selector Guide

TOP MARK

ORDER NUMBER

(Pb free)

RESET

THRESHOLD (V)

OUTPUT TYPE

SOT-89

G671L463T25U G671L463T25Uf

4.60

Open-Drain

663G

G671L438T25U G671L438T25Uf

4.32

Open-Drain

663F

G671L400T25U G671L400T25Uf

3.96

Open-Drain

663E

G671L330T25U G671L330T25Uf

3.30

Open-Drain

663D

G671L308T25U G671L308T25Uf

3.10

Open-Drain

663C

G671L293T25U G671L293T25Uf

2.91

Open-Drain

663B

G671L263T25U G671L263T25Uf

2.64

Open-Drain

663A

G670H463T25U G670H463T25Uf

4.60

Push-Pull

RESET

662N

G670H438T25U G670H438T25Uf

4.32

Push-Pull

RESET

662M

G670H400T25U G670H400T25Uf

3.96

Push-Pull

RESET

662L

G670H330T25U G670H330T25Uf

3.30

Push-Pull

RESET

662K

G670H308T25U G670H308T25Uf

3.10

Push-Pull

RESET

662J

G670H293T25U G670H293T25Uf

2.91

Push-Pull

RESET

662I

G670H263T25U G670H263T25Uf

2.64

Push-Pull

RESET

662H

G670L463T25U G670L463T25Uf

4.60

Push-Pull

662G

G670L438T25U G670L438T25Uf

4.32

Push-Pull

662F

G670L400T25U G670L400T25Uf

3.96

Push-Pull

662E

G670L330T25U G670L330T25Uf

3.30

Push-Pull

662D

G670L308T25U G670L308T25Uf

3.10

Push-Pull

662C

G670L293T25U G670L293T25Uf

2.91

Push-Pull

662B

G670L263T25U G670L263T25Uf

2.64

Push-Pull

662A

Note: T2: SOT-89
Not all product options are ready for mass production, please contact factory for availability.

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Selector Guide

TOP MARK

ORDER NUMBER

(Pb free)

RESET

THRESHOLD (V)

OUTPUT TYPE

SOT-23

G671L463T71U G671L463T71Uf

4.60

Open-Drain

669Gx

G671L438T71U G671L438T71Uf

4.32

Open-Drain

669Fx

G671L400T71U G671L400T71Uf

3.96

Open-Drain

669Ex

G671L330T71U G671L330T71Uf

3.30

Open-Drain

669Dx

G671L308T71U G671L308T71Uf

3.10

Open-Drain

669Cx

G671L293T71U G671L293T71Uf

2.91

Open-Drain

669Bx

G671L263T71U G671L263T71Uf

2.64

Open-Drain

669Ax

G670H463T71U G670H463T71Uf

4.60

Push-Pull

RESET

668Nx

G670H438T71U G670H438T71Uf

4.32

Push-Pull

RESET

668Mx

G670H400T71U G670H400T71Uf

3.96

Push-Pull

RESET

668Lx

G670H330T71U G670H330T71Uf

3.30

Push-Pull

RESET

668Kx

G670H308T71U G670H308T71Uf

3.10

Push-Pull

RESET

668Jx

G670H293T71U G670H293T71Uf

2.91

Push-Pull

RESET

668Ix

G670H263T71U G670H263T71Uf

2.64

Push-Pull

RESET

668Hx

G670L463T71U G670L463T71Uf

4.60

Push-Pull

668Gx

G670L438T71U G670L438T71Uf

4.32

Push-Pull

668Fx

G670L400T71U G670L400T71Uf

3.96

Push-Pull

668Ex

G670L330T71U G670L330T71Uf

3.30

Push-Pull

668Dx

G670L308T71U G670L308T71Uf

3.10

Push-Pull

668Cx

G670L293T71U G670L293T71Uf

2.91

Push-Pull

668Bx

G670L263T71U G670L263T71Uf

2.64

Push-Pull

668Ax

Note: T7: SOT-23
Not all product options are ready for mass production, please contact factory for availability.

Selector Guide

TOP MARK

ORDER NUMBER

(Pb free)

RESET

THRESHOLD (V)

OUTPUT TYPE

SOT-23

G671L463T72U G671L463T72Uf

4.60

Open-Drain

667Gx

G671L438T72U G671L438T72Uf

4.32

Open-Drain

667Fx

G671L400T72U G671L400T72Uf

3.96

Open-Drain

667Ex

G671L330T72U G671L330T72Uf

3.30

Open-Drain

667Dx

G671L308T72U G671L308T72Uf

3.10

Open-Drain

667Cx

G671L293T72U G671L293T72Uf

2.91

Open-Drain

667Bx

G671L263T72U G671L263T72Uf

2.64

Open-Drain

667Ax

G670H463T72U G670H463T72Uf

4.60

Push-Pull

RESET

666Nx

G670H438T72U G670H438T72Uf

4.32

Push-Pull

RESET

666Mx

G670H400T72U G670H400T72Uf

3.96

Push-Pull

RESET

666Lx

G670H330T72U G670H330T72Uf

3.30

Push-Pull

RESET

666Kx

G670H308T72U G670H308T72Uf

3.10

Push-Pull

RESET

666Jx

G670H293T72U G670H293T72Uf

2.91

Push-Pull

RESET

666Ix

G670H263T72U G670H263T72Uf

2.64

Push-Pull

RESET

666Hx

G670L463T72U G670L463T72Uf

4.60

Push-Pull

666Gx

G670L438T72U G670L438T72Uf

4.32

Push-Pull

666Fx

G670L400T72U G670L400T72Uf

3.96

Push-Pull

666Ex

G670L330T72U G670L330T72Uf

3.30

Push-Pull

666Dx

G670L308T72U G670L308T72Uf

3.10

Push-Pull

666Cx

G670L293T72U G670L293T72Uf

2.91

Push-Pull

666Bx

G670L263T72U G670L263T72Uf

2.64

Push-Pull

666Ax

Note: T7: SOT-23
Not all product options are ready for mass production, please contact factory for availability.

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Selector Guide

TOP MARK

ORDER NUMBER

(Pb free)

RESET

THRESHOLD (V)

OUTPUT TYPE

SOT-23

G671L463T73U G671L463T73Uf

4.60

Open-Drain

671Gx

G671L438T73U G671L438T73Uf

4.32

Open-Drain

671Fx

G671L400T73U G671L400T73Uf

3.96

Open-Drain

671Ex

G671L330T73U G671L330T73Uf

3.30

Open-Drain

671Dx

G671L308T73U G671L308T73Uf

3.10

Open-Drain

671Cx

G671L293T73U G671L293T73Uf

2.91

Open-Drain

671Bx

G671L263T73U G671L263T73Uf

2.64

Open-Drain

671Ax

G670H463T73U G670H463T73Uf

4.60

Push-Pull

RESET

670Nx

G670H438T73U G670H438T73Uf

4.32

Push-Pull

RESET

670Mx

G670H400T73U G670H400T73Uf

3.96

Push-Pull

RESET

670Lx

G670H330T73U G670H330T73Uf

3.30

Push-Pull

RESET

670Kx

G670H308T73U G670H308T73Uf

3.10

Push-Pull

RESET

670Jx

G670H293T73U G670H293T73Uf

2.91

Push-Pull

RESET

670Ix

G670H263T73U G670H263T73Uf

2.64

Push-Pull

RESET

670Hx

G670L463T73U G670L463T73Uf

4.60

Push-Pull

670Gx

G670L438T73U G670L438T73Uf

4.32

Push-Pull

670Fx

G670L400T73U G670L400T73Uf

3.96

Push-Pull

670Ex

G670L330T73U G670L330T73Uf

3.30

Push-Pull

670Dx

G670L308T73U G670L308T73Uf

3.10

Push-Pull

670Cx

G670L293T73U G670L293T73Uf

2.91

Push-Pull

670Bx

G670L263T73U G670L263T73Uf

2.64

Push-Pull

670Ax

Note: T7: SOT-23
Not all product options are ready for mass production, please contact factory for availability.

Selector Guide

TOP MARK

ORDER NUMBER

(Pb free)

RESET

THRESHOLD (V)

OUTPUT TYPE

SOT-23

G671L463T76U G671L463T76Uf

4.60

Open-Drain

665Gx

G671L438T76U G671L438T76Uf

4.32

Open-Drain

665Fx

G671L400T76U G671L400T76Uf

3.96

Open-Drain

665Ex

G671L330T76U G671L330T76Uf

3.30

Open-Drain

665Dx

G671L308T76U G671L308T76Uf

3.10

Open-Drain

665Cx

G671L293T76U G671L293T76Uf

2.91

Open-Drain

665Bx

G671L263T76U G671L263T76Uf

2.64

Open-Drain

665Ax

G670H463T76U G670H463T76Uf

4.60

Push-Pull

RESET

664Nx

G670H438T76U G670H438T76Uf

4.32

Push-Pull

RESET

664Mx

G670H400T76U G670H400T76Uf

3.96

Push-Pull

RESET

664Lx

G670H330T76U G670H330T76Uf

3.30

Push-Pull

RESET

664Kx

G670H308T76U G670H308T76Uf

3.10

Push-Pull

RESET

664Jx

G670H293T76U G670H293T76Uf

2.91

Push-Pull

RESET

664Ix

G670H263T76U G670H263T76Uf

2.64

Push-Pull

RESET

664Hx

G670L463T76U G670L463T76Uf

4.60

Push-Pull

664Gx

G670L438T76U G670L438T76Uf

4.32

Push-Pull

664Fx

G670L400T76U G670L400T76Uf

3.96

Push-Pull

664Ex

G670L330T76U G670L330T76Uf

3.30

Push-Pull

664Dx

G670L308T76U G670L308T76Uf

3.10

Push-Pull

664Cx

G670L293T76U G670L293T76Uf

2.91

Push-Pull

664Bx

G670L263T76U G670L263T76Uf

2.64

Push-Pull

664Ax

Note: T7: SOT-23
Not all product options are ready for mass production, please contact factory for availability.

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Absolute Maximum Ratings

Terminal Voltage (with respect to GND)
V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +6.0V

RESET, RESET (push-pull) . . . . . -0.3V to (V

+ 0.3V)

RESET (open drain) . . . . . . . . . . . . . . . .-0.3V to +6.0V

Input Current, V

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

Output Current, RESET, RESET . . . . . . . . . . . . .20mA

Continuous Power Dissipation (T

= +70

SOT-23 (derate 4mW/

C above +70

C) . . . .. . 100mW

SOT-89 (derate 4mW/

C above +70

C). . . .. . .100mW

TO-92 (derate 4mW/

C above +70

C). . . .. . . . 100mW

Operating Temperature Range. . . .. . .-40

C to +105

Storage Temperature Range. . . .. . . ..-65

C to +150

Reflow Temperature (soldering, 10sec) . . . .. . .+260

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Electrical Characteristics

= full range, T

= -40

C to +105

C, unless otherwise noted. Typical values are at T

= +25

C, V

= 5V

for 463/438/400/330 versions, V

= 3.3V for 308/293 versions, and V

= 3V for 263 version.) (Note 1)

PARAMETER

SYMBOL CONDITION

MIN TYP MAX UNIT

= 0

C +70

C 1.0

---

5.5

Range

= -40

C +105

C 1.2

---

5.5

<5.5V, G67_

_463/438/400/330_

--- 16.5 25

Supply Current

<3.6V, G67_ _308/293/263_

= -40

C +105

--- 13.9 22

G67_ _463_

4.50 4.60

4.69

G67_ _438_

4.23 4.32

4.40

G67_ _400_

3.88 3.96

4.04

G67_ _330_

3.24 3.30

3.37

G67_ _308_

3.04

3.10 3.16

G67_ _293_

2.86

2.91 2.96

Reset Threshold

G67_ _263_

= +25

2.59 2.64 2.69

Reset Threshold Hysterisis

HYST

3.60 5.30 7.00

Reset Threshold Tempco

---

ppm/

to Reset Delay (Note 2)

= V

to (V

100mV)

---

Reset Active Timeout Period

= V

max,

---

RESET

Output Current Low

(push-pull active low,and
open-drain active-low, G670L
and G671L)

= 2.5V, V

RESET

= 0.5V

8 --- --- mA

= 5V, V

RESET

= 4.5V, G670L463/438/400/330

4.5 --- ---

= 3.3V, V

RESET

= 2.8V,G670L308/293

3 --- ---

RESET

Output Current High

(push-pull active low, G670L)

= 3V, V

RESET

= 2.5V, G670L263

2 --- ---

= 5V, V

RESET

= 0.5V, G670H463/438/400/330

---

= 3.3V, V

RESET

= 0.5V, G670H308/293

---

RESET Output Current Low
(push-pull active high, G670H)

= 3V, V

RESET

= 0.5V, G670H263

---

RESET Output Current High
(push-pull active high, G670H)

= 2.5V, V

RESET

= 2V

---

RESET

Open-Drain Output

Leakage Current (G671L)

> V

, RESET deasserted

--- --- 1

Note 1: Production testing done at T

= +25

C; limits over temperature guaranteed by design.

Note 2:

RESET

output is for G670L/G671L; While RESET output is for G670H.

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Typical Operating Characteristics

= full range, T

= -40

C to +105

C, unless otherwise noted. Typical values are at T

= +25

C, V

= 5V

for 463/438/400 versions, V

= 3.3V for 308/293 versions, and V

= 3V for 263 version.)

Supply Current vs.Temperature

(No Load)

-40

-20

Temperature (

upply

u
rr

ent (µ

)

Power-down Reset Delay vs.

Temperature (G67_ _308/293/263)

-40

-20

Temperature (

r
-
d
o
w

n
R

e
se

t
De

l
a
y (

100

120

140

-40

-20

Temperature (

o
w

e
r-

wn Re

s
e
t
D

e
l
a

y
(

s
)

Power-down Reset Delay vs.

Temperature (G67_ _463/438/400/330)

Normalized Reset Threshold

vs. Temperature

0.988

0.99

0.992

0.994

0.996

0.998

1.002

-40

-20

Temperature (

i
z
ed

h
r
e
s
h

G67_ _ 463/438/400/330, V

= 5V

G67_ _ 308/293/263, V

= 3.3V

G67_ _ 463/438/400/330/308/293/263, V

=1V

= V

- V

= 10mV

= 20mV

= 100mV

= V

- V

= 10mV

= 20mV

=100mV

=200mV

Recommended Minimum Footprint

SOT-89

SOT-23

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Pin Description

NAME FUNCTION

GND Ground

(G671L/G670L)

RESET

Output remains low while V

is below the reset threshold, and for at most 2ms after V

rises

above the reset threshold.

RESET

(G670H)

RESET Output remains high while V

is below the reset threshold, and for at most 2ms after V

rises

above the reset threshold.

VCC

Supply Voltage (+5V, +3.3V, +3.0V)

Detailed Description

A microprocessor's (

s) reset input starts the

P in a

known state. The G671L/G670L/G670H assert reset to
prevent code-execution errors during power-up,
power-down, or brownout conditions. They assert a
reset signal whenever the V

supply voltage declines

below a preset threshold, keeping it asserted for at
most 2ms after V

has risen above the reset thresh-

old. The G671L uses an open-drain output, and the
G670L/G670H have a push-pull output stage. Connect
a pull-up resistor on the G671L's RESET output to any
supply between 0 and 5.5V.

Figure 1. Maximum Transient Duration Without

Causing a Reset Pulse vs. Reset Com-
parator Overdrive

Figure 2.

RESET

Valid to V

= Ground Circuit

Applications Information

Negative-Going V

Transients

In addition to issuing a reset to the

P during power-up,

power-down, and brownout conditions, the G671L/
G670H/G670L are relatively immune to short- duration
negative-going V

transients (glitches).

Figure 1 shows typical transient duration vs. reset
comparator overdrive, for which the G671L/G670H/
G670L do not generate a reset pulse. The graph was
generated using a negative-going pulse applied to V

starting 0.5V above the actual reset threshold and
ending below it by the magnitude indicated (reset
comparator overdrive). The graph indicates the maxi-
mum pulse width a negative-going V

transient can

have without causing a reset pulse. As the magnitude
of the transient increases (goes farther below the reset
threshold), the maximum allowable pulse width de-
creases. Typically, for the G67_ _463 and G67_ _438,
a V

transient that goes 100mV below the reset

threshold and lasts 7

s or less will not cause a reset

pulse. A 0.1

F bypass capacitor mounted as close as

possible to the V

pin provides additional transient

immunity.

Ensuring a Valid Reset Output Down to V

= 0

When V

falls below 1V, the G670 RESET output

no longer sinks current--it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most

P and other circuitry is inoperative with

VCC

below 1V. However, in applications where RESET
must be valid down to 0V, adding a pull-down resistor
to RESET causes any stray leakage currents to flow
to ground, holding RESET low (Figure 2). R1's value
is not critical; 100k

is large enough not to load

RESET and small enough to pull RESET to ground.

A 100k

pull-up resistor to

VCC

is also recommended

for the G671L if RESET is required to remain valid
for V

< 1V.

100

200

300

400

500

600

100

1000

Reset Com parator Overdrive, V

- V

C C

(m V)

i
m

r
ans

i
ent

r
a

t
i
on

(
u

)

G67_ _ 308/293/263

G67_ _ 463/438/400

RESET

GND

G670

R1
100k

RESET

GND

G670

R1
100k

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Figure 3. Interfacing to

Ps with Bidirectional Re-

set

I/O

Figure 4. G671L Open-Drain

RESET

Output Allows

Use with Multiple Supplies

Interfacing to

Ps with Bidirectional Reset Pins

Since the RESET

output on the G671L is open drain,

this device interfaces easily with

Ps that have bidirec-

tional reset pins, such as the Motorola 68HC11. Con-
necting the

P supervisor

s RESET

output directly to

the microcontroller's (

s) RESET

pin with a single

pull-up resistor allows either device to assert reset
(Figure 3).

G671L Open-Drain

RESET

Output Allows Use with

Multiple Supplies
Generally, the pull-up connected to the G671L will
connect to the supply voltage that is being monitored
at the IC

s V

pin. However, some systems may use

the open-drain output to level-shift from the monitored
supply to reset circuitry powered by some other supply
(Figure 4). Note that as the G671L

s V

decreases

below 1V, so does the IC

s ability to sink current at

RESET . Also, with any pull-up, RESET

will be pulled

high as

VCC

decays toward 0. The voltage where this

occurs depends on the pull-up resistor value and the
voltage to which it is connected.

Benefits of Highly Accurate Reset Threshold

Most

P supervisor ICs have reset threshold voltages

between 5% and 10% below the value of nominal
supply voltages. This ensures a reset will not occur
within 5% of the nominal supply, but will occur when
the supply is 10% below nominal.

When using ICs rated at only the nominal supply

5%,

this leaves a zone of uncertainty where the supply is
between 5% and 10% low, and where the reset may or
may not be asserted.

The G67_ _463/G67_ _308 use highly accurate circuitry
to ensure that reset is asserted close to the 5% limit,
and long before the supply has declined to 10% below
nominal.

RESET
INPUT

GND

RESET

GND

G671

MOTOROLA

68HCXX

PULL-UP

RESET
INPUT

GND

RESET

GND

G671

MOTOROLA

68HCXX

PULL-UP

RESET
INPUT

GND

5V SYSTEM

RESET

GND

G671

PULL-UP

+3.3V

+5.0V

RESET
INPUT

GND

5V SYSTEM

RESET

GND

G671

PULL-UP

+3.3V

+5.0V

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

SOT-89 (T2) Package

DIMENSIONS IN MILLIMETER

DIMENSIONS IN INCH

SYMBOL

MIN NOM MAX MIN NOM MAX

A 1.40

1.50

1.60

0.055

0.059

0.063

A1 0.80 1.04 ----- 0.031 0.041 -----

b 0.36

0.42

0.48

0.014

0.016

0.018

b1 0.41 0.47 0.53

0.016

0.018

0.020

C 038

0.40

0.43

0.014

0.015

0.017

D 4.40

4.50

4.60

0.173

0.177

0.181

D1 1.40 1.60 1.75

0.055

0.062

0.069

HE ----- ----- 4.25 ----- ----- 0.167

E 2.40

2.50

2.60

0.094

0.098

0.102

e 2.90

3.00

3.10

0.114

0.118

0.122

POLISH

MATTE FINISH

POLISH

MATTE FINISH

POLISH

Ver: 1.5
Dec 03, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

G670/G671

Global Mixed-mode Technology Inc.

Package Information

SOT-23 (T7) Package

Note:

1.Package body sizes exclude mold flash protrusions or gate burrs
2.Tolerance ±0.1000 mm (4mil) unless otherwise specified
3.Coplanarity: 0.1000mm
4.Dimension L is measured in gage plane

DIMENSIONS IN MILLIMETER

SYMBOL

MIN NOM MAX

A 1.00 1.10

1.30

A1 0.00 ----- 0.10
A2 0.70 0.80 0.90

b 0.35

0.40

0.50

C 0.10 0.15

0.25

D 2.70 2.90

3.10

E 1.40 1.60

1.80

e -----

1.90(TYP)

-----

H 2.60 2.80

3.00

L 0.37

------ -----

Taping Specification

PACKAGE Q

TY/REEL Q

TY/BY BAG

TO-92 ----- 2,000

SOT-89 1,000

ea -----

SOT-23 3,000

ea -----

GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.

Feed Direction

SOT-89 Package Orientation

Feed Direction

SOT-23 Package Orientation

Feed Direction

SOT-89 Package Orientation

Feed Direction

SOT-89 Package Orientation

Feed Direction

SOT-23 Package Orientation

Feed Direction

SOT-23 Package Orientation

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: G671L463T76UF

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: G671L463T76UF