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Número de pieza G692
Descripción 4-Pin UP Voltage Monitors with Manual Reset Input
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Global Mixed-mode Technology Inc.
G692/G693
4-Pin µP Voltage Monitors with Manual Reset Input
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 (G692L)
Push-Pull RESET Output (G692H)
Open-Drain RESET Output (G693L)
„140ms min Power-On Reset Pulse Width
„5µA Supply Current
„Guaranteed Reset Valid to VCC = +1V
„Power Supply Transient Immunity
„No External Components
„Manual Reset Input
„4-Pin SOT143 Package
Applications
„Computers
„Controllers
„Intelligent Instruments
„Critical µP and µC Power Monitoring
„Portable / Battery-Powered Equipment
„Automotive
Pin Configuration
General Description
The G692/G693 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. The G692/G693 also provide a de-
bounced manual reset input.
These circuits perform a single function: 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. Reset thresholds suitable for operation with
a variety of supply voltages are available.
The G693L has an open-drain output stage, while the
G692 have push-pull outputs. The G693L’s open-drain
RESET output requires a pull-up resistor that can be
connected to a voltage higher than VCC. The G692L
have an active-low RESET output, while the G692H
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.
Low supply current makes the G692/G693 ideal for
use in portable equipment. The G692/G693 are avail-
able in a 4-pin SOT143 packages.
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
G692H(L)xxxTC -40°C ~ +105°C
SOT143
G693LxxxTC -40°C ~ +105°C
SOT143
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
Typical Operating Circuit
GND 1
4 VCC
G692/G693
RESET(RESET) 2
()is for G692H
SOT143
3 MR
VCC
VCC
G692/G693
MR
RESET
(RESET)
GND
VCC
*RPULL-UP
µP
RESET
INPUT
GND
*G693 ONLY
Ver: 1.0
Sep 23, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
1

1 page




G692 pdf
Global Mixed-mode Technology Inc.
G692/G693
Pin Description
PIN NAME
1 GND
RESET
2 (G693L/G692L)
RESET
(G692H)
3 MR
4 VCC
Ground
FUNCTION
RESET Output remains low while VCC is below the reset threshold, and for at least 140ms after
VCC rises above the reset threshold.
RESET Output remains high while VCC is below the reset threshold, and for at least 140ms after
VCC rises above the reset threshold.
Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is
low and for at least 140ms after MR returns high, This active-low input has an internal 20kpull-
up resistor. It can be driven from a TTL or CMOS-logic line, or shorted to ground with a switch.
Leave open if unused.
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The G693L/G692L/G692H 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 G693L uses an open-drain output, and
the G692L/G692H have a push-pull output stage. Con-
nect a pull-up resistor on the G693L’s RESET output to
any supply between 0 and 5.5V.
The manual reset input ( MR ) can also initiate a reset.
See the Manual Reset Input Section.
Manual Reset Input
Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR as-
serts reset. Reset remains asserted while MR is low,
and for the Reset Active Timeout Period (tRP) after
MR returns high. This input has an internal 20k
pull-up resistor, so it can be left open if it is not used.
MR can be driven with TTL or CMOS-logic levels, or
with open-drain / collector outputs. Connect a normally
open momentary switch from MR to GND to create a
manual-reset function; external debounce circuitry is
not required. If MR is driven from long cables or if the
device is used in a noisy environment, connecting a
0.1µF capacitor from MR to ground provides additional
noise immunity.
600
500
400
300
200
100
0
1 10 100
Reset Comparator Overdrive, VTH-VCC (mV)
1000
Figure 1.Maximum Transient Duration Without
Causing a Reset Pulse vs. Reset Com-
parator Overdrive
VCC
G692
RESET
GND
R1
100k
Figure2. RESET Valid to VCC = Ground Circuit
Ver: 1.0
Sep 23, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
5

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