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Global Mixed-mode Technology Inc.
G692/G693
4-Pin P Voltage Monitors with Manual Reset Input
Features
Precision Monitoring of +3V, +3.3V, and +5V Power-Supply Voltages
General Description
The G692/G693 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. The G692/G693 also provide a debounced 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 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. Low supply current makes the G692/G693 ideal for use in portable equipment. The G692/G693 are available in a 4-pin SOT143 packages.
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 5A 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 P and C Power Monitoring Portable / Battery-Powered Equipment Automotive
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
SOT143 SOT143 G692H(L)xxxTC -40C ~ +105C G693LxxxTC -40C ~ +105C
* xxx specifies the threshold voltage. e.g. 263 denotes the 2.63V threshold voltage.
Pin Configuration
Typical Operating Circuit
VCC GND
1
4 VCC
VCC RPULL-UP*
VCC
G692/G693
G692/G693
MR RESET (RESET) GND
RESET INPUT
P
GND
RESET(RESET)
2 SOT143
3 MR
()is for G692H
*G693 ONLY
Ver: 1.0 Sep 23, 2002
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
G692/G693
Continuous Power Dissipation (TA = +70C) SOT 143 (derate 4mW/C above +70C)...........320mW Operating Temperature Range ............-40C to +105C Storage Temperature Range................-65C to +150C Lead Temperature (soldering, 10s) ...................+300C
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 = -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.) (Note 1) PARAMETER
VCC Range Supply Current ICC
SYMBOL
TA = 0C +70C TA = -40C +105C
CONDITION
MIN
1.0 1.2
TYP MAX UNITS
5.5 5.5 9 8 4.722 4.467 4.08 3.141 2.988 2.682 V A
TA = -40C +105C G69_ _463_ G69_ _438_ G69_ _400_ G69_ _308_ G69_ _293_ G69_ _263_
VCC<5.5V, G69_ _463/438/400_ VCC<3.6V, G69_ _308/293/263_ TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C 4.537 4.292 3.92 3.018 2.871 2.577
5.5 5 4.63 4.38 4.00 3.08 2.93 2.63
Reset Threshold
VTH
V
Ver: 1.0 Sep 23, 2002
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Global Mixed-mode Technology Inc.
Electrical Characteristics (Continued)
G692/G693
MIN TYP
70 15 250 140 510 310 10 100 720 520
(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.) (Note 1) PARAMETER
Reset Threshold Tempco VCC to Reset Delay (Note 2) Reset Active Timeout Period
SYMBOL
CONDITION
VCC = VTH to (VTH - 100mV) VCC = VTH max, G69_ _ 463/438/400 VCC = VTH max, G69_ _308/293/263
MAX
UNITS
ppm/C
ms s ns s V K mA
MR Minima Pulse Width MR Glitch Immunity (Note 3) MR to Reset Propagation Delay (Note 2) MR Input Threshold MR Pull-up Resistance
RESET Output Current Low (push-pull active low, and opendrain active-low, G692L and G693L) RESET Output Current High (push-pull active low, G692L)
tMR
tMD VIH VIL VCC > VTH(max) 0.6 x VCC
0.5
0.25 x VCC 10 20 30
IOL
VCC = 2.5V, V RESET = 0.5V 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 VCC = 5V, VRESET = 0.5V, G692H463/438/400 VCC = 3.3V, VRESET = 0.5V, G692H308/293 VCC = 3V, VRESET = 0.5V, G692H263 VCC = 2.5V, VRESET = 2V VCC > VTH, RESET deasserted
8 4.5 3 2 16 12 10 2 1
IOH
mA
RESET Output Current Low (push-pull active high, G692H) RESET Output Current High (push-pull active high, G692H)
RESET Open-Drain Output Leakage Current (G693L)
IOL IOH
mA mA A
Note 1: Production testing done at TA = +25C; 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
PART/SUFFIX
G693L463T_ G693L438T_ G693L400T_ G693L308T_ G693L293T_ G693L263T_ G692H463T_ G692H438T_ G692H400T_ G692H308T_ G692H293T_ G692H263T_ G692L463T_ G692L438T_ G692L400T_ G692L308T_ G692L293T_ G692L263T_
RESET THRESHOLD (V)
4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63
OUTPUT TYPE
Open-Drain RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET Open-Drain RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET
TOP MARK
693Fx 693Ex 693Dx 693Cx 693Bx 693Ax 692Lx 692Kx 692Jx 692Ix 692Hx 692Gx 692Fx 692Ex 692Dx 692Cx 692Bx 692Ax
Ver: 1.0 Sep 23, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Operating Characteristics
G692/G693
(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 G69_ _ 463/438/400, VCC=5V 80 70
Supply Current (A) Power-down Reset Delay (s)
Power-down Reset Delay vs. Temperature (G69_ _308/293/263)
15
VOD=20mV
60 50 40 30 20 10 0 -40 -20 0 VOD=125mV VOD=200mV 20 40 60 Temperature(C) 80 VOD=VTH-VCC
10
G69_ _ 308/293/263, VCC=3.3V G69_ _ 463/438/400/308/293/263, VCC=1V
5
0 -40 -20 0 20 40 Temperature (C) 60 80
Power-up Reset Timeout vs. Temperature
330
Power-up Reset Timeout (ms)
Normalized Reset Threshold vs. Temperature
1.006 1.004
Normalized Threshold
325 320 315 310 305 -40 -20 0 20 40 60 80 Temperature (C) G69_ _ 308/293/263
1.002 1 0.998 0.996 0.994 0.992 0.99 0.988 0.986
-40 -20 0 20 40 60 80 Temperature(C)
Ver: 1.0 Sep 23, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Pin Description
PIN
1 2
G692/G693
NAME
GND
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 20k pullup 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)
VCC
Detailed Description
A microprocessor's (P's) reset input starts the P 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. The manual reset input ( MR ) can also initiate a reset. See the Manual Reset Input Section. Manual Reset Input Many P-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 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 0.1F capacitor from MR to ground provides additional noise immunity.
Maximun Transient Duration (u s)
600
500
400
300
200
100
0
1 10 100 1000
Reset Comparator Overdrive, VTH -VCC (mV)
Figure 1.Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator 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
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Global Mixed-mode Technology Inc.
Applications Information
Negative-Going VCC Transients In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, the G693L/G692H/G692L are relatively immune to shortduration negative-going VCC transients (glitches). 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 15s 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 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 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. A 100k pull-up resistor to VCC is also recommended for the G693L if RESET is required to remain valid for VCC < 1V.
V CC
G692/G693
+5.0V +5.0 +3.3V VCC RPULL-UP VCC
G693
RESET
5V SYSTEM
RESET INPUT
GND
GND
Figure 4. G693L Open-Drain RESET Output Allows Use with Multiple Supplies Interfacing to Ps with Bidirectional Reset Pins Since the RESET output on the G693L 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). 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. 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 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.
VCC RPULL-UP
V CC
G693
RESET
P
RESET MOTOROLA INPUT 68HCXX
GND
GND
Figure 3. Interfacing to Ps with Bidirectional Reset I/O
Ver: 1.0 Sep 23, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Package Information
D e1 L C
G692/G693
E E1
e2
bx3
A2 A1 b1
A
SOT 143 Package
DIMENSION IN MILIMETERS MIN. MAX.
0.95 0.05 0.90 0.37 0.76 0.10 2.80 1.20 2.30 1.92 BSC. 0.20 BSC. 0.69 REF. 1.20 0.10 1.10 0.46 0.89 0.18 3.04 1.40 2.50
SYMBOL
A A1 A2 b b1 C D E E1 e1 e2 L
MIN.
0.037 0.002 0.035 0.145 0.030 0.004 0.110 0.047 0.091
DIMENSION IN INCHS MAX.
0.047 0.004 0.043 0.018 0.035 0.007 0.120 0.055 0.098 0.75 BSC. 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.
Ver: 1.0 Sep 23, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
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