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G691L400T23 Datasheet(PDF) 8 Page - Global Mixed-mode Technology Inc

Part # G691L400T23
Description  Microprocessor Reset IC
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Manufacturer  GMT [Global Mixed-mode Technology Inc]
Direct Link  http://www.gmt.com.tw
Logo GMT - Global Mixed-mode Technology Inc

G691L400T23 Datasheet(HTML) 8 Page - Global Mixed-mode Technology Inc

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Ver: 1.3
Oct 31, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
8
G690/G691
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
FUNCTION
1
GND
Ground
(G691L/G690L)
RESET
Output remains low while VCC is below the reset threshold, and for at least 140ms after
VCC rises above the reset threshold.
2
RESET
(G690H)
RESET Output remains high while VCC is below the reset threshold, and for at least 140ms after
VCC rises above the reset threshold.
3
VCC
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The G691L/G690L/G690H 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
least 140ms after VCC has risen above the reset
threshold. The G691L uses an open-drain output, and
the G690L/G690H have a push-pull output stage.
Connect a pull-up resistor on the G691L’s RESET out-
put to any supply between 0 and 5.5V.
Figure 1. Maximum Transient Duration Without
Causing a Reset Pulse vs. Reset Com-
parator Overdrive
Figure2. RESET Valid to VCC = Ground Circuit
Applications Information
Negative-Going VCC Transients
In addition to issuing a reset to the µP during
power-up, power-down, and brownout conditions, the
G691L/G690H/G690L are relatively immune to short-
duration negative-going VCC transients (glitches).
Figure 1 shows typical transient duration vs. reset
comparator overdrive, for which the G691L/G690H/
G690L 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 G69_ _463 and G69_ _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.
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 1V, the G690 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 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
to ground, holding RESET low (Figure 2). 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 G691L if RESET is required to remain valid
for VCC < 1V.
V
CC
RESET
GND
G690
R1
100k
V
CC
RESET
GND
G690
R1
100k
0
100
200
300
400
500
600
1
10
100
1000
Reset Comparator Overdrive, VTH- VCC (mV)
G69_ _ 308/293/263
G69_ _ 463/438/400


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