G671L293T71UF [GMT]
Power Management Circuit, Fixed, +2.91VV;型号: | G671L293T71UF |
厂家: | GLOBAL MIXED-MODE TECHNOLOGY INC |
描述: | Power Management Circuit, Fixed, +2.91VV |
文件: | 总13页 (文件大小:165K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
G670/G671
Microprocessor Reset IC
Features
General Description
Precision Monitoring of +3V, +3.3V, and +5V
The G670/G671 are microprocessor (µP) supervisory
circuits used to monitor the power supplies in µP 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.
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 VCC = +1V
Power Supply Transient Immunity
No External Components
These circuits perform a single function: they assert a
reset signal whenever the VCC 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
3-Pin SOT-23,TO-92 and SOT-89 Packages
2% Threshold Accuracy
RESET output requires a pull-up resistor that can be
connected to a voltage higher than VCC. 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 VCC,
and the outputs are guaranteed to be in the correct
logic state for VCC down to 1V.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable / Battery-Powered Equipment
Automotive
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
VCC
3
VCC
VCC
*
RPULL-UP
Top
View
G670/G671
TopView
µP
RESET
RESET
(RESET)
INPUT
GND
GND
1
3
2
2
1
1
3
2
SOT-89
SOT-23
TO-92
*G671 only
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
1
Global Mixed-mode Technology Inc.
G670/G671
Ordering Information
ORDER NUMBER
(Pb free)
ORDER NUMBER
TEMP. RANGE
OUTPUT TYPE
G670LxxxTDxB
G670HxxxTDxB
G670LxxxT2xUf
G670HxxxT2xUf
G671LxxxT2xUf
G670LxxxT2xUf
G670HxxxT2xUf
G671LxxxT2xUf
G670LxxxT7xUf
G670HxxxT7xUf
G671LxxxT7xUf
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
-40°C ~ +105°C
Push-Pull Active Low
Push-Pull Active High
Open-Drain
G671LxxxTDxB
G670LxxxT2xU
Push-Pull Active Low
Push-Pull Active High
Open-Drain
G670HxxxT2xU
G671LxxxT2xU
G670LxxxT7xU
Push-Pull Active Low
Push-Pull Active High
Open-Drain
G670HxxxT7xU
G671LxxxT7xU
Note: U : Tape & Reel B: Bag
Order Number Identification
G67XX XXX T7
X
Pin Option
Package Type
Threshold Voltage Option
Part Number
PART NUMBER
THRESHOLD VOLTAGE OPTION
* xxx specifies the threshold voltage.
G670L : Push-Pull Active Low Output
G670H : Push-Pull Active High Output
G671L : Open-Drain Output
e.g. 263 denotes the 2.64V threshold voltage.
PACKAGE TYPE
TD : TO-92
PIN OPTION
1
2
3
1 :RESET
2 :RESET
T2 : SOT-89
GND
VCC
VCC
GND
T7 : SOT-23
RESET
3 : GND
4 : GND
5 : VCC
VCC
RESET
RESET
VCC
GND
RESET
6 : VCC
GND
*RESET for G670H
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
2
Global Mixed-mode Technology Inc.
G670/G671
Selector Guide
TOP MARK
RESET
THRESHOLD (V)
ORDER NUMBER
(Pb free)
OUTPUT TYPE
ORDER NUMBER
TO-92
663G
xx
G671L463TD5U
G671L438TD5U
G671L400TD5U
G671L330TD5U
G671L308TD5U
G671L293TD5U
G671L263TD5U
G670H463TD5U
G670H438TD5U
G670H400TD5U
G670H330TD5U
G670H308TD5U
G670H293TD5U
G670H263TD5U
G670L463TD5U
G670L438TD5U
G670L400TD5U
G670L330TD5U
G670L308TD5U
G670L293TD5U
G671L463TD5Uf
G671L438TD5Uf
G671L400TD5Uf
G671L330TD5Uf
G671L308TD5Uf
G671L293TD5Uf
G671L263TD5Uf
G670H463TD5Uf
G670H438TD5Uf
G670H400TD5Uf
G670H330TD5Uf
G670H308TD5Uf
G670H293TD5Uf
G670H263TD5Uf
G670L463TD5Uf
G670L438TD5Uf
G670L400TD5Uf
G670L330TD5Uf
G670L308TD5Uf
G670L293TD5Uf
G670L263TD5Uf
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
Open-Drain
Open-Drain
663F
xx
663E
xx
Open-Drain
663D
xx
Open-Drain
663C
xx
Open-Drain
663B
xx
Open-Drain
662A
xx
Open-Drain
662N
xx
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull
662M
xx
662L
xx
662K
xx
662J
xx
662I
xx
662H
xx
662G
xx
662F
xx
Push-Pull
662E
xx
Push-Pull
662D
xx
Push-Pull
662C
xx
Push-Pull
662B
xx
Push-Pull
662A
xx
G670L263TD5U
Push-Pull
Note: TD: TO-92
Not all product options are ready for mass production, please contact factory for availability.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
3
Global Mixed-mode Technology Inc.
G670/G671
Selector Guide
TOP MARK
SOT-89
RESET
THRESHOLD (V)
ORDER NUMBER
(Pb free)
OUTPUT TYPE
ORDER NUMBER
663G
xx
G671L463T25U
G671L438T25U
G671L400T25U
G671L330T25U
G671L308T25U
G671L293T25U
G671L263T25U
G670H463T25U
G670H438T25U
G670H400T25U
G670H330T25U
G670H308T25U
G670H293T25U
G670H263T25U
G670L463T25U
G670L438T25U
G670L400T25U
G670L330T25U
G670L308T25U
G670L293T25U
G671L463T25Uf
G671L438T25Uf
G671L400T25Uf
G671L330T25Uf
G671L308T25Uf
G671L293T25Uf
G671L263T25Uf
G670H463T25Uf
G670H438T25Uf
G670H400T25Uf
G670H330T25Uf
G670H308T25Uf
G670H293T25Uf
G670H263T25Uf
G670L463T25Uf
G670L438T25Uf
G670L400T25Uf
G670L330T25Uf
G670L308T25Uf
G670L293T25Uf
G670L263T25Uf
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
Open-Drain
Open-Drain
663F
xx
663E
xx
Open-Drain
663D
xx
Open-Drain
663C
xx
Open-Drain
663B
xx
Open-Drain
662A
xx
Open-Drain
662N
xx
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull
662M
xx
662L
xx
662K
xx
662J
xx
662I
xx
662H
xx
662G
xx
662F
xx
Push-Pull
662E
xx
Push-Pull
662D
xx
Push-Pull
662C
xx
Push-Pull
662B
xx
Push-Pull
662A
xx
G670L263T25U
Push-Pull
Note: T2: SOT-89
Not all product options are ready for mass production, please contact factory for availability.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
4
Global Mixed-mode Technology Inc.
G670/G671
Selector Guide
TOP MARK
RESET
THRESHOLD (V)
ORDER NUMBER
(Pb free)
OUTPUT TYPE
ORDER NUMBER
SOT-23
669Gx
669Fx
669Ex
669Dx
669Cx
669Bx
669Ax
668Nx
668Mx
668Lx
668Kx
668Jx
668Ix
G671L463T71U
G671L438T71U
G671L400T71U
G671L330T71U
G671L308T71U
G671L293T71U
G671L263T71U
G670H463T71U
G670H438T71U
G670H400T71U
G670H330T71U
G670H308T71U
G670H293T71U
G670H263T71U
G670L463T71U
G670L438T71U
G670L400T71U
G670L330T71U
G670L308T71U
G670L293T71U
G670L263T71U
Note: T7: SOT-23
G671L463T71Uf
G671L438T71Uf
G671L400T71Uf
G671L330T71Uf
G671L308T71Uf
G671L293T71Uf
G671L263T71Uf
G670H463T71Uf
G670H438T71Uf
G670H400T71Uf
G670H330T71Uf
G670H308T71Uf
G670H293T71Uf
G670H263T71Uf
G670L463T71Uf
G670L438T71Uf
G670L400T71Uf
G670L330T71Uf
G670L308T71Uf
G670L293T71Uf
G670L263T71Uf
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull
668Hx
668Gx
668Fx
668Ex
668Dx
668Cx
668Bx
668Ax
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Not all product options are ready for mass production, please contact factory for availability.
Selector Guide
TOP MARK
SOT-23
667Gx
667Fx
667Ex
667Dx
667Cx
667Bx
667Ax
666Nx
666Mx
666Lx
RESET
THRESHOLD (V)
ORDER NUMBER
(Pb free)
OUTPUT TYPE
ORDER NUMBER
G671L463T72U
G671L438T72U
G671L400T72U
G671L330T72U
G671L308T72U
G671L293T72U
G671L263T72U
G670H463T72U
G670H438T72U
G670H400T72U
G670H330T72U
G670H308T72U
G670H293T72U
G670H263T72U
G670L463T72U
G670L438T72U
G670L400T72U
G670L330T72U
G670L308T72U
G670L293T72U
G670L263T72U
Note: T7: SOT-23
G671L463T72Uf
G671L438T72Uf
G671L400T72Uf
G671L330T72Uf
G671L308T72Uf
G671L293T72Uf
G671L263T72Uf
G670H463T72Uf
G670H438T72Uf
G670H400T72Uf
G670H330T72Uf
G670H308T72Uf
G670H293T72Uf
G670H263T72Uf
G670L463T72Uf
G670L438T72Uf
G670L400T72Uf
G670L330T72Uf
G670L308T72Uf
G670L293T72Uf
G670L263T72Uf
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull
666Kx
666Jx
666Ix
666Hx
666Gx
666Fx
666Ex
666Dx
666Cx
666Bx
666Ax
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Not all product options are ready for mass production, please contact factory for availability.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
5
Global Mixed-mode Technology Inc.
G670/G671
Selector Guide
TOP MARK
RESET
THRESHOLD (V)
ORDER NUMBER
(Pb free)
OUTPUT TYPE
ORDER NUMBER
SOT-23
671Gx
671Fx
671Ex
671Dx
671Cx
671Bx
671Ax
670Nx
670Mx
670Lx
670Kx
670Jx
670Ix
G671L463T73U
G671L438T73U
G671L400T73U
G671L330T73U
G671L308T73U
G671L293T73U
G671L263T73U
G670H463T73U
G670H438T73U
G670H400T73U
G670H330T73U
G670H308T73U
G670H293T73U
G670H263T73U
G670L463T73U
G670L438T73U
G670L400T73U
G670L330T73U
G670L308T73U
G670L293T73U
G670L263T73U
Note: T7: SOT-23
G671L463T73Uf
G671L438T73Uf
G671L400T73Uf
G671L330T73Uf
G671L308T73Uf
G671L293T73Uf
G671L263T73Uf
G670H463T73Uf
G670H438T73Uf
G670H400T73Uf
G670H330T73Uf
G670H308T73Uf
G670H293T73Uf
G670H263T73Uf
G670L463T73Uf
G670L438T73Uf
G670L400T73Uf
G670L330T73Uf
G670L308T73Uf
G670L293T73Uf
G670L263T73Uf
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull
670Hx
670Gx
670Fx
670Ex
670Dx
670Cx
670Bx
670Ax
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Not all product options are ready for mass production, please contact factory for availability.
Selector Guide
TOP MARK
SOT-23
665Gx
665Fx
665Ex
665Dx
665Cx
665Bx
665Ax
664Nx
664Mx
664Lx
RESET
THRESHOLD (V)
ORDER NUMBER
(Pb free)
OUTPUT TYPE
ORDER NUMBER
G671L463T76U
G671L438T76U
G671L400T76U
G671L330T76U
G671L308T76U
G671L293T76U
G671L263T76U
G670H463T76U
G670H438T76U
G670H400T76U
G670H330T76U
G670H308T76U
G670H293T76U
G670H263T76U
G670L463T76U
G670L438T76U
G670L400T76U
G670L330T76U
G670L308T76U
G670L293T76U
G670L263T76U
Note: T7: SOT-23
G671L463T76Uf
G671L438T76Uf
G671L400T76Uf
G671L330T76Uf
G671L308T76Uf
G671L293T76Uf
G671L263T76Uf
G670H463T76Uf
G670H438T76Uf
G670H400T76Uf
G670H330T76Uf
G670H308T76Uf
G670H293T76Uf
G670H263T76Uf
G670L463T76Uf
G670L438T76Uf
G670L400T76Uf
G670L330T76Uf
G670L308T76Uf
G670L293T76Uf
G670L263T76Uf
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
4.60
4.32
3.96
3.30
3.10
2.91
2.64
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Open-Drain
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull
664Kx
664Jx
664Ix
664Hx
664Gx
664Fx
664Ex
664Dx
664Cx
664Bx
664Ax
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Push-Pull
Not all product options are ready for mass production, please contact factory for availability.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
6
Global Mixed-mode Technology Inc.
G670/G671
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
Continuous Power Dissipation (TA = +70°C)
VCC.……………………………..……….….-0.3V to +6.0V
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°C
Storage Temperature Range..….….….-65°C to +150°C
Reflow Temperature (soldering, 10sec)……......+260°C
RESET,RESET (push-pull)....…....-0.3V to (VCC + 0.3V)
RESET (open drain)...…..............…........-0.3V to +6.0V
Input Current, VCC ............................….................20mA
Output Current, RESET, RESET ........................20mA
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
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V
for 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)
PARAMETER
VCC Range
SYMBOL
CONDITION
MIN TYP MAX UNIT
TA = 0°C +70°C
1.0
1.2
---
---
5.5
5.5
V
TA = -40°C +105°C
VCC<5.5V, G67_
_463/438/400/330_
---
16.5
25
Supply Current
ICC
TA = -40°C +105°C
µA
VCC<3.6V, G67_ _308/293/263_
G67_ _463_
---
13.9
22
4.50 4.60
4.23 4.32
3.88 3.96
3.24 3.30
4.69
4.40
4.04
3.37
G67_ _438_
G67_ _400_
Reset Threshold
VTH
TA = +25°C
V
G67_ _330_
G67_ _308_
3.04 3.10 3.16
2.86 2.91 2.96
2.59 2.64 2.69
3.60 5.30 7.00
G67_ _293_
G67_ _263_
Reset Threshold Hysterisis
Reset Threshold Tempco
VHYST
%
ppm/°
C
---
40
---
VCC to Reset Delay (Note 2)
Reset Active Timeout Period
VCC = VTH to (VTH – 100mV)
VCC = VTH max,
---
---
7
---
2
µs
---
ms
RESET Output Current Low
(push-pull active low,and
open-drain active-low, G670L
and G671L)
VCC = 2.5V, V RESET = 0.5V
IOL
8
---
---
mA
VCC = 5V, V RESET = 4.5V, G670L463/438/400/330
VCC = 3.3V, V RESET = 2.8V,G670L308/293
4.5
3
---
---
---
---
---
---
---
---
---
---
---
---
RESET Output Current High
(push-pull active low, G670L)
IOH
mA
mA
V
CC = 3V, V RESET = 2.5V, G670L263
2
VCC = 5V, VRESET = 0.5V, G670H463/438/400/330
VCC = 3.3V, VRESET = 0.5V, G670H308/293
VCC = 3V, VRESET = 0.5V, G670H263
16
12
10
RESET Output Current Low
(push-pull active high, G670H)
IOL
RESET Output Current High
(push-pull active high, G670H)
IOH
VCC = 2.5V, VRESET = 2V
2
---
---
---
1
mA
µA
RESET Open-Drain Output
Leakage Current (G671L)
---
VCC > VTH, RESET deasserted
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
Note 2:RESET output is for G670L/G671L; While RESET output is for G670H.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
7
Global Mixed-mode Technology Inc.
G670/G671
Typical Operating Characteristics
(VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V
for 463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.)
Power-down Reset Delay vs.
Temperature (G67_ _463/438/400/330)
Supply Current vs.Temperature
(No Load)
140
120
100
80
20
15
10
5
VOD = VTH - VCC
G67_ _ 463/438/400/330, VCC = 5V
VOD = 10mV
VOD = 20mV
G67_ _ 308/293/263, VCC = 3.3V
60
40
G67_ _ 463/438/400/330/308/293/263, VCC =1V
VOD = 100mV
20
0
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Normalized Reset Threshold
vs. Temperature
Power-down Reset Delay vs.
Temperature (G67_ _308/293/263)
1.002
1
70
60
50
40
30
20
10
0
VOD = VTH - VCC
0.998
0.996
0.994
0.992
0.99
VOD = 10mV
VOD = 20mV
VOD =100mV
VOD =200mV
0.988
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Recommended Minimum Footprint
SOT-23
SOT-89
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
8
Global Mixed-mode Technology Inc.
G670/G671
Pin Description
NAME
FUNCTION
GND
Ground
RESET Output remains low while VCC is below the reset threshold, and for at most 2ms after VCC rises
above the reset threshold.
(G671L/G670L)
RESET
(G670H)
RESET Output remains high while VCC is below the reset threshold, and for at most 2ms after VCC rises
above the reset threshold.
VCC
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
Applications Information
A microprocessor’s (µP’s) reset input starts the µP 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 VCC supply voltage declines
below a preset threshold, keeping it asserted for at
most 2ms after VCC 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
Negative-Going VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down,
and
brownout
conditions,
the
G671L/G670H/G670L are relatively immune to short-
duration negative-going VCC 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 VCC,
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 VCC 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 VCC transient that goes 100mV below the reset
threshold and lasts 7µs or less will not cause a reset
pulse. A 0.1µF bypass capacitor mounted as close as
possible to the VCC pin provides additional transient
immunity.
a pull-up resistor on the G671L’s RESET output to any
supply between 0 and 5.5V.
600
500
400
300
G67_ _ 463/438/400
200
100
Ensuring a Valid Reset Output Down to VCC = 0
G67_ _ 308/293/263
0
When VCC falls below 1V, the G670 RESET output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
1
10
100
1000
Reset Comparator Overdrive, VTH- VCC (mV)
Figure 1. Maximum Transient Duration Without
Causing a Reset Pulse vs. Reset Com-
parator Overdrive
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most µP 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
VCC
to ground, holding RESET low (Figure 2). R1’s value
is not critical; 100kΩ is large enough not to load
RESET and small enough to pull RESET to ground.
G670
RESET
A 100kΩ pull-up resistor to VCC is also recommended
for the G671L if RESET is required to remain valid
for VCC < 1V.
R1
100k
GND
Figure 2. RESET Valid to VCC = Ground Circuit
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
9
Global Mixed-mode Technology Inc.
G670/G671
Interfacing to µPs with Bidirectional Reset Pins
VCC
Since the RESET output on the G671L is open drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11. Con-
VCC
VCC
RPULL-UP
necting the µP supervisor’s RESET output directly to
µP
G671
the microcontroller’s (µC’s) RESET pin with a single
pull-up resistor allows either device to assert reset
(Figure 3).
RESET MOTOROLA
RESET
INPUT
68HCXX
GND
GND
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 VCC 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 VCC decreases
below 1V, so does the IC’s ability to sink current at
Figure 3. Interfacing to µPs with Bidirectional Re-
set
I/O
+5.0V
+3.3V
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.
VCC
VCC
RPULL-UP
5V SYSTEM
G671
RESET
INPUT
RESET
Benefits of Highly Accurate Reset Threshold
Most µP 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.
GND
GND
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.
Figure 4. G671L Open-Drain RESET Output Allows
Use with Multiple Supplies
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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
10
Global Mixed-mode Technology Inc.
G670/G671
Package Information
L
b
E
e
D
A
C
A1
D1
G
TO-92 (TD) Package
MILLIMETER
INCH
MAX
0.152
0.061
0.020
0.191
0.020
0.592
0.055
0.165
0.189
0.191
SYMBOL
MIN
3.35
MAX
3.86
MIN
0.132
0.041
0.010
0.171
0.010
0.572
0.045
0.145
0.169
0.171
A
A1
b
1.0414
0.254
4.34
1.55
0.508
4.85
E
C
0.254
14.53
1.143
3.683
4.29
0.508
15.04
1.397
4.191
4.80
L
e
G
D
D1
4.34
4.85
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
11
Global Mixed-mode Technology Inc.
G670/G671
D
D1
POLISH
E
HE
A1
e
C
MATTE FINISH
A
b
b1
POLISH
b
SOT-89 (T2) Package
DIMENSIONS IN MILLIMETER
DIMENSIONS IN INCH
SYMBOL
MIN
NOM
1.50
1.04
0.42
0.47
0.40
4.50
1.60
-----
MAX
MIN
0.055
0.031
0.014
0.016
0.014
0.173
0.055
-----
NOM
0.059
0.041
0.016
0.018
0.015
0.177
0.062
-----
MAX
0.063
-----
A
A1
b
1.40
0.80
0.36
0.41
038
1.60
-----
0.48
0.53
0.43
4.60
1.75
4.25
2.60
3.10
0.018
0.020
0.017
0.181
0.069
0.167
0.102
0.122
b1
C
D
4.40
1.40
-----
D1
HE
E
2.40
2.90
2.50
3.00
0.094
0.114
0.098
0.118
e
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
12
Global Mixed-mode Technology Inc.
G670/G671
Package Information
C
D
L
E
H
e
θ1
A
A2
A1
b
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
1.00
0.00
0.70
0.35
0.10
2.70
1.40
-----
NOM
1.10
MAX
1.30
0.10
0.90
0.50
0.25
3.10
1.80
-----
A
A1
A2
b
-----
0.80
0.40
C
0.15
D
2.90
E
1.60
e
1.90(TYP)
2.80
H
2.60
0.37
1º
3.00
-----
L
------
θ1
5º
9º
Taping Specification
PACKAGE
TO-92
Q’TY/REEL
-----
Q’TY/BY BAG
2,000 ea
-----
SOT-89
SOT-23
1,000 ea
3,000 ea
Feed Direction
Feed Direction
SOT-23 Package Orientation
SOT-89 Package Orientation
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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.5
Dec 03, 2005
13
相关型号:
©2020 ICPDF网 联系我们和版权申明