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Global Mixed-mode Technology Inc.
G670/G671
Microprocessor Reset IC
Features
Precision Monitoring of +3V, +3.3V, and +5V Power-Supply Voltages
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- powered circuits. 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 available. 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 VCC. The G670L have an active-low RESET output, while the G670H has an active-high RESET output. The reset comparator 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.
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 14A Supply Current Guaranteed Reset Valid to VCC = +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 C Power Monitoring Portable / Battery-Powered Equipment Automotive
Low supply current makes the G670/G671 ideal for use in portable equipment. The G670/G671 are available in 3-pin SOT-23, TO-92 and SOT-89 packages.
Pin Configuration
Typical Application Circuit
VCC 3 VCC VCC RPULL-UP*
Top View Top View
Top View
G670/G671
RESET (RESET)
P
RESET INPUT GND
1
2
1
2
3
GND 1 2 3
SOT-23
SOT-89
TO-92
*G671 only
Ver: 1.5 Dec 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Ordering Information
ORDER NUMBER
G670LxxxTDxB G670HxxxTDxB G671LxxxTDxB G670LxxxT2xU G670HxxxT2xU G671LxxxT2xU G670LxxxT7xU G670HxxxT7xU G671LxxxT7xU
G670/G671
OUTPUT TYPE
Push-Pull Active Low Push-Pull Active High Open-Drain Push-Pull Active Low Push-Pull Active High Open-Drain Push-Pull Active Low Push-Pull Active High Open-Drain
ORDER NUMBER (Pb free)
G670LxxxTDxBf G670HxxxTDxBf G671LxxxTDxBf G670LxxxT2xUf G670HxxxT2xUf G671LxxxT2xUf G670LxxxT7xUf G670HxxxT7xUf G671LxxxT7xUf
TEMP. RANGE
-40C ~ +105C -40C ~ +105C -40C ~ +105C -40C ~ +105C -40C ~ +105C -40C ~ +105C -40C ~ +105C -40C ~ +105C -40C ~ +105C
Note: U : Tape & Reel B: Bag
Order Number Identification
G67XX XXX XX X Pin Option Package Type Threshold Voltage Option Part Number
PART NUMBER
G670L : Push-Pull Active Low Output G670H : Push-Pull Active High Output G671L : Open-Drain Output
THRESHOLD VOLTAGE OPTION
* xxx specifies the threshold voltage. e.g. 263 denotes the 2.64V threshold voltage.
PACKAGE TYPE
TD : TO-92 T2 : SOT-89 T7 : SOT-23
PIN OPTION
1 1 : RESET 2 : RESET 3 : GND 4 : GND 5 : VCC 6 : VCC *RESET for G670H 2 GND VCC
RESET
3 VCC GND VCC
RESET
RESET
VCC GND
RESET
GND
Ver: 1.5 Dec 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Selector Guide
ORDER NUMBER
G671L463TD5B G671L438TD5B G671L400TD5B G671L330TD5B G671L308TD5B G671L293TD5B G671L263TD5B G670H463TD5B G670H438TD5B G670H400TD5B G670H330TD5B G670H308TD5B G670H293TD5B G670H263TD5B G670L463TD5B G670L438TD5B G670L400TD5B G670L330TD5B G670L308TD5B G670L293TD5B G670L263TD5B
G670/G671
OUTPUT TYPE
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 Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull
ORDER NUMBER (Pb free)
G671L463TD5Bf G671L438TD5Bf G671L400TD5Bf G671L330TD5Bf G671L308TD5Bf G671L293TD5Bf G671L263TD5Bf G670H463TD5Bf G670H438TD5Bf G670H400TD5Bf G670H330TD5Bf G670H308TD5Bf G670H293TD5Bf G670H263TD5Bf G670L463TD5Bf G670L438TD5Bf G670L400TD5Bf G670L330TD5Bf G670L308TD5Bf G670L293TD5Bf G670L263TD5Bf
RESET THRESHOLD (V)
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
TOP MARK TO-92
663G xx 663F xx 663E xx 663D xx 663C xx 663B xx 663A xx 662N xx 662M xx 662L xx 662K xx 662J xx 662I xx 662H xx 662G xx 662F xx 662E xx 662D xx 662C xx 662B xx 662A xx
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
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Global Mixed-mode Technology Inc.
Selector Guide
ORDER NUMBER
G671L463T25U G671L438T25U G671L400T25U G671L330T25U G671L308T25U G671L293T25U G671L263T25U G670H463T25U G670H438T25U G670H400T25U G670H330T25U G670H308T25U G670H293T25U G670H263T25U G670L463T25U G670L438T25U G670L400T25U G670L330T25U G670L308T25U G670L293T25U G670L263T25U
G670/G671
OUTPUT TYPE
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 Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull
ORDER NUMBER (Pb free)
G671L463T25UF G671L438T25Uf G671L400T25Uf G671L330T25Uf G671L308T25Uf G671L293T25Uf G671L263T25Uf G670H463T25Uf G670H438T25Uf G670H400T25Uf G670H330T25Uf G670H308T25Uf G670H293T25Uf G670H263T25Uf G670L463T25Uf G670L438T25Uf G670L400T25Uf G670L330T25Uf G670L308T25Uf G670L293T25Uf G670L263T25Uf
RESET THRESHOLD (V)
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
TOP MARK SOT-89
663G xx 663F xx 663E xx 663D xx 663C xx 663B xx 663A xx 662N xx 662M xx 662L xx 662K xx 662J xx 662I xx 662H xx 662G xx 662F xx 662E xx 662D xx 662C xx 662B xx 662A xx
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
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Global Mixed-mode Technology Inc.
Selector Guide
ORDER NUMBER
G671L463T71U G671L438T71U G671L400T71U G671L330T71U G671L308T71U G671L293T71U G671L263T71U G670H463T71U G670H438T71U G670H400T71U G670H330T71U G670H308T71U G670H293T71U G670H263T71U G670L463T71U G670L438T71U G670L400T71U G670L330T71U G670L308T71U G670L293T71U G670L263T71U
G670/G671
OUTPUT TYPE
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 Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull
ORDER NUMBER (Pb free)
G671L463T71Uf G671L438T71Uf G671L400T71Uf G671L330T71Uf G671L308T71Uf G671L293T71Uf G671L263T71Uf G670H463T71Uf G670H438T71Uf G670H400T71Uf G670H330T71Uf G670H308T71Uf G670H293T71Uf G670H263T71Uf G670L463T71Uf G670L438T71Uf G670L400T71Uf G670L330T71Uf G670L308T71Uf G670L293T71Uf G670L263T71Uf
RESET THRESHOLD (V)
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
TOP MARK SOT-23
669Gx 669Fx 669Ex 669Dx 669Cx 669Bx 669Ax 668Nx 668Mx 668Lx 668Kx 668Jx 668Ix 668Hx 668Gx 668Fx 668Ex 668Dx 668Cx 668Bx 668Ax
Note: T7: SOT-23 Not all product options are ready for mass production, please contact factory for availability.
Selector Guide
ORDER NUMBER
G671L463T72U G671L438T72U G671L400T72U G671L330T72U G671L308T72U G671L293T72U G671L263T72U G670H463T72U G670H438T72U G670H400T72U G670H330T72U G670H308T72U G670H293T72U G670H263T72U G670L463T72U G670L438T72U G670L400T72U G670L330T72U G670L308T72U G670L293T72U G670L263T72U
ORDER NUMBER (Pb free)
G671L463T72Uf G671L438T72Uf G671L400T72Uf G671L330T72Uf G671L308T72Uf G671L293T72Uf G671L263T72Uf G670H463T72Uf G670H438T72Uf G670H400T72Uf G670H330T72Uf G670H308T72Uf G670H293T72Uf G670H263T72Uf G670L463T72Uf G670L438T72Uf G670L400T72Uf G670L330T72Uf G670L308T72Uf G670L293T72Uf G670L263T72Uf
RESET THRESHOLD (V)
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
OUTPUT TYPE
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 Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull
TOP MARK SOT-23
667Gx 667Fx 667Ex 667Dx 667Cx 667Bx 667Ax 666Nx 666Mx 666Lx 666Kx 666Jx 666Ix 666Hx 666Gx 666Fx 666Ex 666Dx 666Cx 666Bx 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
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Global Mixed-mode Technology Inc.
Selector Guide
ORDER NUMBER
G671L463T73U G671L438T73U G671L400T73U G671L330T73U G671L308T73U G671L293T73U G671L263T73U G670H463T73U G670H438T73U G670H400T73U G670H330T73U G670H308T73U G670H293T73U G670H263T73U G670L463T73U G670L438T73U G670L400T73U G670L330T73U G670L308T73U G670L293T73U G670L263T73U
G670/G671
OUTPUT TYPE
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 Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull
ORDER NUMBER (Pb free)
G671L463T73Uf G671L438T73Uf G671L400T73Uf G671L330T73Uf G671L308T73Uf G671L293T73Uf G671L263T73Uf G670H463T73Uf G670H438T73Uf G670H400T73Uf G670H330T73Uf G670H308T73Uf G670H293T73Uf G670H263T73Uf G670L463T73Uf G670L438T73Uf G670L400T73Uf G670L330T73Uf G670L308T73Uf G670L293T73Uf G670L263T73Uf
RESET THRESHOLD (V)
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
TOP MARK SOT-23
671Gx 671Fx 671Ex 671Dx 671Cx 671Bx 671Ax 670Nx 670Mx 670Lx 670Kx 670Jx 670Ix 670Hx 670Gx 670Fx 670Ex 670Dx 670Cx 670Bx 670Ax
Note: T7: SOT-23 Not all product options are ready for mass production, please contact factory for availability.
Selector Guide
ORDER NUMBER
G671L463T76U G671L438T76U G671L400T76U G671L330T76U G671L308T76U G671L293T76U G671L263T76U G670H463T76U G670H438T76U G670H400T76U G670H330T76U G670H308T76U G670H293T76U G670H263T76U G670L463T76U G670L438T76U G670L400T76U G670L330T76U G670L308T76U G670L293T76U G670L263T76U
ORDER NUMBER (Pb free)
G671L463T76Uf G671L438T76Uf G671L400T76Uf G671L330T76Uf G671L308T76Uf G671L293T76Uf G671L263T76Uf G670H463T76Uf G670H438T76Uf G670H400T76Uf G670H330T76Uf G670H308T76Uf G670H293T76Uf G670H263T76Uf G670L463T76Uf G670L438T76Uf G670L400T76Uf G670L330T76Uf G670L308T76Uf G670L293T76Uf G670L263T76Uf
RESET THRESHOLD (V)
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
OUTPUT TYPE
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 Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull
TOP MARK SOT-23
665Gx 665Fx 665Ex 665Dx 665Cx 665Bx 665Ax 664Nx 664Mx 664Lx 664Kx 664Jx 664Ix 664Hx 664Gx 664Fx 664Ex 664Dx 664Cx 664Bx 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
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Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
Terminal Voltage (with respect to GND) VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +6.0V 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
G670/G671
Continuous Power Dissipation (TA = +70C) SOT-23 (derate 4mW/C above +70C) . . . .. . 100mW SOT-89 (derate 4mW/C above +70C). . . .. . .100mW TO-92 (derate 4mW/C above +70C). . . .. . . . 100mW Operating Temperature Range. . . .. . .-40C to +105C Storage Temperature Range. . . .. . . ..-65C to +150C Reflow Temperature (soldering, 10sec) . . . .. . .+260C
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 = -40C to +105C, unless otherwise noted. Typical values are at TA = +25C, 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
TA = 0C +70C
CONDITION
TA = -40C +105C
MIN
1.0 1.2 ----4.50 4.23 TA = +25C 3.88 3.24 3.04 2.86 2.59 3.60 -------
TYP MAX
----16.5 13.9 4.60 4.32 3.96 3.30 3.10 2.91 2.64 5.30 40 7 --5.5 5.5 25 22 4.69 4.40 4.04 3.37 3.16 2.96 2.69 7.00 ----2
UNIT
V
Supply Current
ICC
VCC<5.5V, G67_ _463/438/400/330_ TA = -40C +105C VCC<3.6V, G67_ _308/293/263_ G67_ _463_ G67_ _438_
A
Reset Threshold
VTH
G67_ _400_ G67_ _330_ G67_ _308_ G67_ _293_ G67_ _263_
V
Reset Threshold Hysterisis Reset Threshold Tempco VCC to Reset Delay (Note 2) Reset Active Timeout Period
RESET Output Current Low (push-pull active low,and open-drain active-low, G670L and G671L)
RESET Output Current High (push-pull active low, G670L)
VHYST VCC = VTH to (VTH - 100mV) VCC = VTH max, VCC = 2.5V, V RESET = 0.5V
% ppm/C s ms
IOL
8
---
---
mA
VCC = 5V, V RESET = 4.5V, G670L463/438/400/330 IOH VCC = 3.3V, V RESET = 2.8V,G670L308/293 VCC = 3V, V RESET = 2.5V, G670L263 VCC = 5V, VRESET = 0.5V, G670H463/438/400/330 VCC = 3.3V, VRESET = 0.5V, G670H308/293 VCC = 3V, VRESET = 0.5V, G670H263 VCC = 2.5V, VRESET = 2V
4.5 3 2 16 12 10 2 ---
-----------------
--------------1 mA
RESET Output Current Low (push-pull active high, G670H) RESET Output Current High (push-pull active high, G670H)
IOL IOH
mA
mA A
RESET Open-Drain Output VCC > VTH, RESET deasserted Leakage Current (G671L) Note 1: Production testing done at TA = +25C; 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
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Global Mixed-mode Technology Inc.
Typical Operating Characteristics
G670/G671
Power-down Reset Delay vs. Temperature (G67_ _463/438/400/330)
(VCC = full range, TA = -40C to +105C, unless otherwise noted. Typical values are at TA = +25C, VCC = 5V for 463/438/400 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.)
Supply Current vs.Temperature (No Load)
20 Power-Down Reset Delay (s)
140
VOD = VTH - VCC
120 100 80
VOD = 20mV VOD = 10mV
Supply Current (A)
15
G67_ _ 463/438/400/330, VCC = 5V
10
G67_ _ 308/293/263, VCC = 3.3V
60 40 20 0
VOD = 100mV
5
G67_ _ 463/438/400/330/308/293/263, VCC =1V
0
-40 -20 0 20 40 60 80
-40
-20
0
20
40
60
80
Temperature (C)
Temperature (C)
Power-down Reset Delay vs. Temperature (G67_ _308/293/263)
70
VOD = VTH - VCC
1.002 1
Normalized Reset Threshold vs. Temperature
Power-down Reset Delay (s)
60 50 40 30 20
VOD =100mV VOD = 10mV VOD = 20mV
Normalized Threshold
0.998 0.996 0.994 0.992 0.99 0.988
10 0
-40 -20 0
VOD =200mV
20
40
60
80
-40
-20
0
20
40
60
80
Temperature (C)
Temperature (C)
Recommended Minimum Footprint
SOT-23 SOT-89
Ver: 1.5 Dec 03, 2005
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Global Mixed-mode Technology Inc.
Pin Description
NAME
GND (G671L/G670L) RESET (G670H) VCC Ground
G670/G671
FUNCTION
RESET Output remains low while VCC is below the reset threshold, and for at most 2ms after VCC rises above the reset threshold. RESET Output remains high while VCC is below the reset threshold, and for at most 2ms after VCC rises above the reset threshold. Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor's (P'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 VCC supply voltage declines below a preset threshold, keeping it asserted for at most 2ms after VCC has risen above the reset threshold. 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.
Applications Information
Negative-Going VCC 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 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 maximum 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 decreases. Typically, for the G67_ _463 and G67_ _438, a VCC transient that goes 100mV below the reset threshold and lasts 7s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. Ensuring a Valid Reset Output Down to VCC = 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 connected 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.
R1 100k
600
500
M axim um Trans ient Duration(us )
400
300
200
G67_ _ 463/438/400
100
G67_ _ 308/293/263 0
1 10 100 1000
Reset Com parator Overdrive, V TH - V C C (m V)
Figure 1. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
VCC
G670
RESET
GND
A 100k pull-up resistor to VCC is also recommended for the G671L if RESET is required to remain valid for VCC < 1V.
Figure 2. RESET Valid to VCC = Ground Circuit
Ver: 1.5 Dec 03, 2005
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Global Mixed-mode Technology Inc.
VCC
G670/G671
VCC RPULL-UP
VCC
G671
RESET
P
RESET MOTOROLA INPUT 68HCXX
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 bidirectional reset pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the microcontroller's (C'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 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 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.
GND
GND
Figure 3. Interfacing to Ps with Bidirectional Reset I/O
+5.0V +3.3V
VCC RPULL-UP
VCC
G671
RESET
5V SYSTEM
RESET INPUT
GND
GND
Figure 4. G671L Open-Drain RESET Output Allows Use with Multiple Supplies
Ver: 1.5 Dec 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
10
Global Mixed-mode Technology Inc.
Package Information
G670/G671
L b
E e
D
C A1 D1 G
A
TO-92 (TD) Package
SYMBOL
A A1 b E C L e G D D1
MILLIMETER MIN
3.35 1.0414 0.254 4.34 0.254 14.53 1.143 3.683 4.29 4.34
INCH MAX
3.86 1.55 0.508 4.85 0.508 15.04 1.397 4.191 4.80 4.85
MIN
0.132 0.041 0.010 0.171 0.010 0.572 0.045 0.145 0.169 0.171
MAX
0.152 0.061 0.020 0.191 0.020 0.592 0.055 0.165 0.189 0.191
Ver: 1.5 Dec 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
11
Global Mixed-mode Technology Inc.
D D1
G670/G671
POLISH
E HE A1 e C
MATTE FINISH
A
b
b1
b
POLISH
SOT-89 (T2) Package
SYMBOL
A A1 b b1 C D D1 HE E e
DIMENSIONS IN MILLIMETER MIN NOM MAX
1.40 0.80 0.36 0.41 038 4.40 1.40 ----2.40 2.90 1.50 1.04 0.42 0.47 0.40 4.50 1.60 ----2.50 3.00 1.60 ----0.48 0.53 0.43 4.60 1.75 4.25 2.60 3.10
MIN
0.055 0.031 0.014 0.016 0.014 0.173 0.055 ----0.094 0.114
DIMENSIONS IN INCH NOM
0.059 0.041 0.016 0.018 0.015 0.177 0.062 ----0.098 0.118
MAX
0.063 ----0.018 0.020 0.017 0.181 0.069 0.167 0.102 0.122
Ver: 1.5 Dec 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
12
Global Mixed-mode Technology Inc.
Package Information
G670/G671
C L
D
E
H
e
1
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
SYMBOL
A A1 A2 b C D E e H L 1
MIN
1.00 0.00 0.70 0.35 0.10 2.70 1.40 ----2.60 0.37 1
DIMENSIONS IN MILLIMETER NOM
1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 2.80 -----5
MAX
1.30 0.10 0.90 0.50 0.25 3.10 1.80 ----3.00 ----9
Taping Specification
PACKAGE
TO-92
Feed Direction SOT-23 Package Orientation Feed Direction SOT-89 Package Orientation
Q'TY/REEL
----1,000 ea 3,000 ea
Q'TY/BY BAG
2,000 ea ---------
SOT-89 SOT-23
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.
Ver: 1.5 Dec 03, 2005
TEL: 886-3-5788833 http://www.gmt.com.tw
13

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