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G683L18SQL1U 数据表(PDF) 14 Page - Global Mixed-mode Technology Inc

部件名 G683L18SQL1U
功能描述  Low Voltage Reset IC
PDF  18 Pages
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制造商  GMT [Global Mixed-mode Technology Inc]
网页  http://www.gmt.com.tw
标志 GMT - Global Mixed-mode Technology Inc

G683L18SQL1U 数据表(HTML) 14 Page - Global Mixed-mode Technology Inc

Back Button G683L18SQL1U Datasheet HTML 10Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 11Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 12Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 13Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 14Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 15Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 16Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 17Page - Global Mixed-mode Technology Inc G683L18SQL1U Datasheet HTML 18Page - Global Mixed-mode Technology Inc  
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Ver: 0.8
Feb 27, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
14
G682/G683
Global Mixed-mode Technology
Ensuring a Valid Reset Output Down to VCC = 0V
When VCC falls below 0.8V, the G682 RESET output
no longer sinks current and 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 μP and other circuitry is inoperative with VCC be-
low 0.8V. 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 4). R1’s value is
not critical; 100k
Ω is large enough not to load RESET
and small enough to pull RESET to ground. A 100k
Ω
pull-up resistor to VCC is also recommended for the
G683L if RESET is required to remain valid for VCC <
0.8V.
Figure 4
G683L Open-Drain RESET Output Allows Use with
Multiple Supplies
Generally, the pull-up connected to the G683L 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 sup-
ply to reset circuitry powered by some other supply
(Figure 5). Note that as the G683L’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.
Figure 5
VCC
RESET
GND
G682
R1
100k
VSEN
VCC
RESET
GND
G682
R1
100k
VSEN
RESET
INPUT
GND
5V SYSTEM
RESET
GND
G683
RPULL-UP
RESET
INPUT
GND
5V SYSTEM
VCC
RPULL-UP
VCC
5V
3.3V
VSEN
Detect
Voltage
RESET
INPUT
GND
5V SYSTEM
RESET
GND
G683
RPULL-UP
RESET
INPUT
GND
5V SYSTEM
VCC
RPULL-UP
VCC
5V
3.3V
VSEN
Detect
Voltage



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