G693L

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 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- 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 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 Ordering Information PART TEMP. RANGE PIN-PACKAGE SOT143 SOT143 G692H(L)xxxTC -40°C ~ +105°C G693LxxxTC -40°C ~ +105°C * 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 RESET INPUT µP 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 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) RESET (open drain)...….......................-0.3V to +6.0V Input Current, VCC ............................….................20mA Output Current, RESET, RESET ........................20mA 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 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 VCC Range Supply Current ICC SYMBOL TA = 0°C +70°C TA = -40°C +105°C 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 µA TA = -40°C +105°C G69_ _463_ G69_ _438_ G69_ _400_ G69_ _308_ G69_ _293_ G69_ _263_ 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 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 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 3 Global Mixed-mode Technology Inc. Typical Operating Characteristics G692/G693 (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) 20 G69_ _ 463/438/400, VCC=5V 80 70 Supply Current (µA) Power-down Reset Delay (µs) 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 4 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 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. Supply Voltage (+5V, +3.3V, +3.0V) VCC 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. 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 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. 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 5 Global Mixed-mode Technology Inc. Applications Information 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). 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. Ensuring a Valid Reset Output Down to VCC = 0 W hen 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 ground, holding RESET low (Figure 2). R1’s value is 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. V CC G692/G693 +5.0V +5.0 +3.3V VCC RPULL-UP VCC G693 RESET 5V SYSTEM RESET RESET INPUT GND GND Figure 4. G693L Open-Drain RESET Output Allows Use with Multiple Supplies 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 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. 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. 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 µP RESET MOTOROLA INPUT 68HCXX GND GND Figure 3. Interfacing to µPs with Bidirectional Reset I/O Ver: 1.0 Sep 23, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw 6 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 7