ETC G693

G692/G693
Global Mixed-mode Technology Inc.
4-Pin µP Voltage Monitors with Manual Reset Input
Features
General Description
„Precision Monitoring of +3V, +3.3V, and +5V
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- powered circuits. The G692/G693 also provide a debounced manual reset input.
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
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 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.
Applications
„Computers
„Controllers
„Intelligent Instruments
„Critical µP and µC Power Monitoring
„Portable / Battery-Powered Equipment
„Automotive
Low supply current makes the G692/G693 ideal for
use in portable equipment. The G692/G693 are available in a 4-pin SOT143 packages.
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
G692H(L)xxxTC -40°C ~ +105°C
G693LxxxTC
-40°C ~ +105°C
SOT143
SOT143
* xxx specifies the threshold voltage.
e.g. 263 denotes the 2.63V threshold voltage.
Pin Configuration
Typical Operating Circuit
VCC
GND
4 VCC
1
VCC
VCC
RPULL-UP*
G692/G693
G692/G693
MR
RESET(RESET)
3 MR
2
RESET
(RESET)
GND
µP
RESET
INPUT
GND
SOT143
()is for G692H
*G693 ONLY
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.0
Sep 23, 2002
1
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)
G692/G693
Continuous Power Dissipation (TA = +70°C)
SOT 143 (derate 4mW/°C above +70°C)….…....320mW
Operating Temperature Range …..…....-40°C to +105°C
Storage Temperature Range..….……....-65°C to +150°C
Lead Temperature (soldering, 10s) ……....…......+300°C
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 p’ermanent 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 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1)
PARAMETER
SYMBOL
VCC Range
Supply Current
Reset Threshold
CONDITION
TA = 0°C +70°C
TA = -40°C +105°C
ICC
TA = -40°C +105°C
VTH
G69_ _463_
G69_ _438_
G69_ _400_
G69_ _308_
G69_ _293_
G69_ _263_
MIN
TYP MAX UNITS
1.0
1.2
VCC<5.5V, G69_ _463/438/400_
5.5
5.5
5.5
9
VCC<3.6V, G69_ _308/293/263_
TA = +25°C
TA = +25°C
TA = +25°C
TA = +25°C
TA = +25°C
TA = +25°C
5
4.63
4.38
4.00
3.08
2.93
2.63
8
4.722
4.467
4.08
3.141
2.988
2.682
4.537
4.292
3.92
3.018
2.871
2.577
V
µA
V
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.0
Sep 23, 2002
2
Global Mixed-mode Technology Inc.
G692/G693
Electrical Characteristics (Continued)
(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.) (Note 1)
PARAMETER
SYMBOL
Reset Threshold Tempco
VCC to Reset Delay (Note 2)
CONDITION
MIN
250
510
720
VCC = VTH max, G69_ _308/293/263
140
310
520
MR Glitch Immunity (Note 3)
MR to Reset Propagation Delay
(Note 2)
tMD
VIH
MR Input Threshold
VIL
10
µs
100
ns
0.5
µs
V
0.25 x VCC
10
IOL
VCC = 2.5V, V RESET = 0.5V
RESET Output Current High
(push-pull active low, G692L)
IOH
VCC = 5V, V RESET = 4.5V, G692L463/438/400
VCC = 3.3V, V RESET = 2.8V, G692L308/293
VCC = 3V, V RESET = 2.5V, G692L263
RESET Output Current Low
(push-pull active high, G692H)
IOL
VCC = 5V, VRESET = 0.5V, G692H463/438/400
VCC = 3.3V, VRESET = 0.5V, G692H308/293
VCC = 3V, VRESET = 0.5V, G692H263
RESET Output Current High
(push-pull active high, G692H)
IOH
VCC = 2.5V, VRESET = 2V
RESET Open-Drain Output Leakage
Current (G693L)
ms
0.6 x VCC
VCC > VTH(max)
MR Pull-up Resistance
RESET Output Current Low
(push-pull active low, and opendrain active-low, G692L and G693L)
UNITS
ppm/°C
VCC = VTH max, G69_ _ 463/438/400
tMR
MR Minima Pulse Width
MAX
70
15
VCC = VTH to (VTH – 100mV)
Reset Active Timeout Period
TYP
20
30
8
mA
4.5
3
2
16
12
10
mA
mA
2
VCC > VTH, RESET deasserted
KΩ
mA
1
µA
Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design.
Note 2: RESET output is for G692L/G693L; While RESET output is for G692H.
Note 3: “Glitches” of 100ns or less typically will not generate a reset pulse.
Selector Guide
TOP MARK
PART/SUFFIX
RESET THRESHOLD (V)
OUTPUT TYPE
G693L463T_
4.63
Open-Drain RESET
693Fx
G693L438T_
4.38
Open-Drain RESET
693Ex
G693L400T_
4.00
Open-Drain RESET
693Dx
G693L308T_
3.08
Open-Drain RESET
693Cx
G693L293T_
2.93
Open-Drain RESET
693Bx
G693L263T_
G692H463T_
G692H438T_
G692H400T_
G692H308T_
G692H293T_
G692H263T_
G692L463T_
2.63
4.63
4.38
4.00
3.08
2.93
2.63
4.63
Open-Drain RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
693Ax
692Lx
692Kx
692Jx
692Ix
692Hx
692Gx
692Fx
G692L438T_
4.38
Push-Pull RESET
692Ex
G692L400T_
4.00
Push-Pull RESET
692Dx
G692L308T_
3.08
Push-Pull RESET
692Cx
G692L293T_
2.93
Push-Pull RESET
692Bx
G692L263T_
2.63
Push-Pull RESET
692Ax
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.0
Sep 23, 2002
3
G692/G693
Global Mixed-mode Technology Inc.
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.)
Supply Current vs.Temperature
(No Load)
Power-down Reset Delay vs. Temperature
(G69_ _308/293/263)
20
80
15
10
Power-down Reset Delay (µs)
Supply Current (µA)
70
G69_ _ 463/438/400, VCC=5V
G69_ _ 308/293/263, VCC=3.3V
G69_ _ 463/438/400/308/293/263, VCC=1V
5
0
VOD=20mV
60
50
VOD=VTH-VCC
40
30
20
VOD=125mV
10
VOD=200mV
0
-40
-20
0
20
40
Temperature (°C)
60
80
-40
Power-up Reset Timeout
vs. Temperature
-20
0
20
40
60
Temperature(°C)
80
Normalized Reset Threshold
vs. Temperature
1.006
330
Normalized Threshold
Power-up Reset Timeout (ms)
1.004
325
320
G69_ _ 308/293/263
315
1.002
1
0.998
0.996
0.994
0.992
0.99
310
0.988
0.986
305
-40
-20
0
20
40
60
-40
80
Temperature (°C)
-20
0
20
40
60
80
Temperature(°C)
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.0
Sep 23, 2002
4
G692/G693
Global Mixed-mode Technology Inc.
Pin Description
PIN
NAME
1
GND
2
RESET
(G693L/G692L)
RESET
(G692H)
FUNCTION
Ground
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
3
4
MR
low and for at least 140ms after MR returns high, This active-low input has an internal 20kΩ pullup resistor. It can be driven from a TTL or CMOS-logic line, or shorted to ground with a switch.
Leave open if unused.
VCC
Supply Voltage (+5V, +3.3V, +3.0V)
Detailed Description
600
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. Connect a pull-up resistor on the G693L’s RESET output to
any supply between 0 and 5.5V.
Maximun Transient Duration (u s)
500
400
300
200
100
0
The manual reset input ( MR ) can also initiate a reset.
See the Manual Reset Input Section.
1
10
100
1000
Reset Comparator Overdrive, VTH -VCC (mV)
Figure 1.Maximum Transient Duration Without
Causing a Reset Pulse vs. Reset Comparator Overdrive
Manual Reset Input
Many µP-based products require manual reset capability, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR asserts 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 20kΩ
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.
VCC
G692
RESET
GND
R1
100k
Figure2. RESET Valid to VCC = Ground Circuit
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.0
Sep 23, 2002
5
G692/G693
Global Mixed-mode Technology Inc.
Applications Information
+5.0
+5.0V
Negative-Going VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down,
and
brownout
conditions,
the
G693L/G692H/G692L are relatively immune to shortduration negative-going VCC transients (glitches).
+3.3V
VCC
Figure1 shows typical transient duration vs. reset
comparator overdrive, for which the G693L/G692H/
G692L 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 G69_ _463 and G69_ _438,
a VCC transient that goes 100mV below the reset
threshold and lasts 15µs 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.
G693
RESET
GND
the microcontroller’s (µC’s) RESET pin with a single
pull-up resistor allows either device to assert reset
(Figure 3).
G693L Open-Drain RESET Output Allows Use with
Multiple Supplies
Generally, the pull-up connected to the G693L 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 G693L’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.
not critical; 100kΩ is large enough not to load RESET
and small enough to pull RESET to ground.
A 100kΩ pull-up resistor to VCC is also recommended
for the G693L if RESET is required to remain valid for
VCC < 1V.
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.
V CC
V CC
RPULL-UP
RESET
GND
GND
Interfacing to µPs with Bidirectional Reset Pins
Since the RESET output on the G693L is open drain,
this device interfaces easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to
ground, holding RESET low (Figure 2). R1’s value is
G693
5V SYSTEM
RESET
INPUT
Figure 4. G693L Open-Drain RESET Output Allows
Use with Multiple Supplies
Ensuring a Valid Reset Output Down to VCC = 0
When VCC falls below 1V, the G692 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 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
VCC
VCC
RPULL-UP
µP
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.
RESET MOTOROLA
INPUT
68HCXX
GND
The G69_ _463/G69_ _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.
Figure 3. Interfacing to µPs with Bidirectional Reset
I/O
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.0
Sep 23, 2002
6
G692/G693
Global Mixed-mode Technology Inc.
Package Information
D
e1
C
L
E E1
bx3
e2
A
A2
A1
b1
SOT 143 Package
SYMBOL
A
A1
A2
b
b1
C
D
E
E1
e1
DIMENSION IN MILIMETERS
MIN.
MAX.
MIN.
DIMENSION IN INCHS
MAX.
0.95
0.05
0.90
0.37
0.76
0.10
2.80
1.20
2.30
0.037
0.002
0.035
0.145
0.030
0.004
0.110
0.047
0.091
0.047
0.004
0.043
0.018
0.035
0.007
0.120
0.055
0.098
e2
L
1.20
0.10
1.10
0.46
0.89
0.18
3.04
1.40
2.50
1.92 BSC.
0.75 BSC.
0.20 BSC.
0.69 REF.
0.078 BSC.
0.27 REF.
Package Orientation
Feed Direction
SOT 143 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: 1.0
Sep 23, 2002
7