G696/G697 Global Mixed-mode Technology Inc. Microprocessor Reset IC Features General Description Precision Monitoring of +3V, +3.3V, and +5V The G696/G697 are microprocessor (µP) supervisory circuits used to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost and adjustments when used with +5V, +3.3V, +3.0V- powered circuits. Power-Supply Voltages Fully Specified Over Temperature Available in Three Output Configurations Push-Pull RESET Output (G696L) Push-Pull RESET Output (G696H) Open-Drain RESET Output (G697L) Externally Programmable Time Delay Generator 6µA Supply Current Guaranteed Reset Valid to VCC = 0.8V Power Supply Transient Immunity 5 pin SOT23-5 Packages These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, with hysteresis keeping it asserted for time delay determined by externally programable time delay generator. after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. Applications The G697L has an open-drain output stage, while the G696 have push-pull outputs. The G697L’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The G696L have an active-low RESET output, while the G696H 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 0.8V. Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive Low supply current makes the G696/G697 ideal for use in portable equipment. The G696/G697 are available in 5-pin SOT23-5 packages. Ordering Information PART TEMP. RANGE PIN-PACKAGE G696H(L)xxxT1 -40°C ~ +105°C G697LxxxT1 -40°C ~ +105°C SOT23-5 SOT23-5 * xxx specifies the threshold voltage. e.g. 263 denotes the 2.63V threshold voltage. Pin Configuration Typical Operating Circuit V CC RESET(RESET) 1 5 CD V CC V CC Rpull-up* V CC 2 G696/G697 G696/G697 CD GND 3 4 N.C. RESET (RESET) GND µP RESET INPUT GND CD SOT23-5 ()is for G696H *G697 ONLY TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 26, 2002 1 Global Mixed-mode Technology Inc. G696/G697 Absolute Maximum Ratings Terminal Voltage (with respect to GND) VCC.……………………………..…….…….-0.3V to +6.0V Delay Capacitor Pin Voltage, VCD…..-0.3 to (VCC +0.3V) RESET, RESET (push-pull)....…....-0.3V to (VCC + 0.3V) Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23-5 (derate 2.17mW/°C above +70°C).174mW 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 (SOT23-5) ICC Reset Threshold VTH- Reset Threshold Hystersis VHYS CONDITION TA = 0°C +70°C TA = -40°C +105°C VCC<5.5V, G69_ _463/438/400/330_ VCC<3.6V, G69_ _308/293/263_ G69_ _463_ G69_ _438_ G69_ _400_ G69_ _330_ G69_ _308_ G69_ _293_ G69_ _263_ G69__463_ G69__438_ G69__400_ G69__330_ G69__308_ G69__293_ G69__263_ MIN 4.537 4.293 3.92 3.234 3.019 2.872 2.578 139 132 120 99 93 88 79 Reset Threshold Tempco CD Delay Pin Threshold Voltage VTDC Delay Capacitor Pin Sink Current Delay Pull up Resistance ICD RD VCC = 5V G69_ _ 463/438/400/330__ VCC =3.3V G69_ _308/293 VCC =3.0V G69_ 263_ VCC = 1.5V, VCD = 0.5V TYP MAX UNITS 0.8 1 3 1.9 1.8 3 1 6 5 4.63 4.38 4 3.30 3.08 2.93 2.63 231 219 200 165 154 146 131 70 3.3 2.3 2.2 5 1.5 5.5 5.5 10 8.5 4.722 4.467 4.08 3.366 3.141 2.988 2.682 324 306 280 231 215 205 184 3.9 2.7 2.6 2.3 V µA V mV ppm/°C V mA MΩ TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 26, 2002 2 Global Mixed-mode Technology Inc. G696/G697 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 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1) PARAMETER SYMBOL RESET Output Current Low (push-pull active low, and open-drain active-low, G696L and G697L) IOL RESET Output Current High (push-pull active low, G696L) RESET Output Current Low (push-pull active high, G696H) RESET Output Current High (push-pull active high, G696H) RESET Open-Drain Output Leakage Current (G697L) IOH IOL IOH CONDITION VCC = 2.5V, V RESET = 0.5V VCC = 5V, V RESET = 4.5V, G696L463/438/400/330 VCC = 3.3V, V RESET = 2.8V, G696L308/293 VCC = 3V, V RESET = 2.5V, G696L263 VCC = 5V, VRESET = 0.5V, G696H463/438/400/330 VCC = 3.3V, VRESET = 0.5V, G696H308/293 VCC = 3V, VRESET = 0.5V, G696H263 VCC = 2.5V, VRESET = 2V MIN TYP MAX UNITS 8 mA 4.5 mA 3 2 16 mA 12 10 2 mA 1 VCC > VTH, RESET deasserted µA Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design. Selector Guide PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE TOP MARK G697L463T_ 4.63 Open-Drain RESET 697Gx G697L438T_ 4.38 Open-Drain RESET 697Fx G697L400T_ 4.00 Open-Drain RESET 697Ex G697L330T_ 3.30 Open-Drain RESET 697Dx G697L308T_ 3.08 Open-Drain RESET 697Cx G697L293T_ 2.93 Open-Drain RESET 697Bx G697L263T_ G696H463T_ G696H438T_ G696H400T_ G696H330T_ G696H308T_ G696H293T_ G696H263T_ G696L463T_ 2.63 4.63 4.38 4.00 3.30 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 Push-Pull RESET 697Ax 696Lx 696Kx 696Jx 696Nx 696Ix 696Hx 696Gx 696Fx G696L438T_ 4.38 Push-Pull RESET 696Ex G696L400T_ 4.00 Push-Pull RESET 696Dx G696L330T_ 3.30 Push-Pull RESET 696Mx G696L308T_ 3.08 Push-Pull RESET 696Cx G696L293T_ 2.93 Push-Pull RESET 696Bx G696L263T_ 2.63 Push-Pull RESET 696Ax TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 26, 2002 3 G696/G697 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 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) Supply Current vs. VCC Supply Curremt vs. Temperature (No Load) 8 7 7 6 VCC=5V 5 VCC=3.3V Supply Current (uA) Supply Current (u A) 6 5 4 3 4 VCC=2.5 3 2 2 1 1 0 0 0 0.6 1 1.2 1.5 1.8 2.1 2.4 2.7 3 3.2 3.3 3.4 3.5 3.7 3.9 4 4.5 5 5.5 6 -40 -20 0 20 VCC (V) 60 80 Output Time Delay vs. Capacitance Normalized Reset Threshold vs. Temperature 1.06 10000 1.05 VT 1.04 Delay between VCC>VTH to output change (ms) 1000 1.03 Output Time Delay Normalized Ormalized V TH+, VTH- (V) 40 Temperature (°C) 1.02 1.01 V TH 1 0.99 0.98 100 10 Delay between VCC<VTH to output change (us) 1 0.97 0.96 -40 -30 -20 -10 0 10 20 27 30 0.1 40 50 60 70 80 90 0.0001 0.001 0.1 1 Delay Resistance vs. Temperature C D Delay Pin Sink Current vs. Voltage 1.75 40 1.7 VCC=3V 35 RD, Delay Resistance (M Ω) ICD, CD DELAY PIN SINK CURRENT (mA) 0.01 CD, Delay Pin Capacitance (uF) T A, Ambient Temperature (°C) 30 25 VCC=2.5 20 15 10 VCC=1.5V 5 1.65 1.6 1.55 1.5 1.45 1.4 1.35 0 1.3 0.05 0.2 0.4 0.6 1.2 1.8 2.4 3 -40 V CD, Delay Pin Voltage (V) -30 -20 -10 0 10 20 30 40 50 60 70 80 90 T A, Ambient Temperature (°C) Reset Output Time Delay vs. Temperature 300 Output Time Delay (ms) 250 CD=0.1u F 200 150 100 50 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 T A, Ambient Temperature (°C) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 26, 2002 4 G696/G697 Global Mixed-mode Technology Inc. Timing Diagram V CC V TH + V TH - V CC , Pin 2 V CC C D , Pin 5 0.675 V IN V CC Reset Output (Active Low), Pin 1 V TH 0V V CC Reset Output (Active High), Pin 1 V TH 0V t D2 Figure 1 Functional Diagram 2 VCC 1 RESET 2 VCC RD + VTH RD 1 * RESET (RESET) + VTH 3 GND 5 CD 3 GND 5 CD () is for G696H Figure 2 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 26, 2002 5 G696/G697 Global Mixed-mode Technology Inc. Pin Description PIN 1 NAME FUNCTION RESET (G696L/G697L) RESET (G696H) 2 3 4 5 VCC GND N.C. CD RESET Output remains low while VCC is below the reset threshold, and for delay time set by CD after VCC rises above the reset threshold. RESET Output remains high while VCC is below the reset threshold, and for delay time set by CD after VCC rises above the reset threshold. Supply Voltage (+5V, +3.3V, +3.0V) Ground No Connection. External Programmable time delay is set by the capacitor connect to CD pin. Detailed Description must be valid down to 0V, adding a pull-down resistor to RESET causes any stray leakage currents to flow A microprocessor’s (µP’s) reset input starts the µP in a known state. The G697L/G696L/G696H 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 (VTH-), keeping it asserted for time delay set by capacitor connected to CD pin, after VCC has risen above the high reset threshold VTH+ (VTH-+VHYS). The G697L uses an open-drain output, and the G696L/G696H have a push-pull output stage. Connect a pull-up resistor on the G697L’s RESET output to any supply between 0 and 5.5V. to ground, holding RESET low (Figure 4). 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 G697L if RESET is required to remain valid for VCC < 0.8V. VCC The time delay is set by external capacitor CD, and internal pull up resistor RD. When the voltage at CD pin exceeds the buffer threshold, typically 0.675 VCC, the RESET output high (RESET output low). The voltage detector and buffer have built-in hysterisis to prevent erratic reset operation. The formula of time delay is T (ms) ≅ 1685 CD (µF). Fig1 and Fig2 show a timing deagram and a Functional Block. VCC VCC RPULL-UP µP G697 RESET MOTOROLA INPUT 68HCXX RESET GND GND Figure 4. Interfacing to µPs with Bidirectional Reset I/O VCC G696 +5.0 +5.0V RESET GND +3.3V R1 100k VCC VCC RPULL-UP Figure3. RESET Valid to VCC = Ground Circuit G697 RESET Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 0.8V, the G696 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 0.8V. However, in applications where RESET GND 5V SYSTEM RESET INPUT GND Figure 5. G697L Open-Drain RESET Output Allows Use with Multiple Supplies TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 26, 2002 6 Global Mixed-mode Technology Inc. Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the G697L 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 di- G696/G697 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. rectly to the microcontroller’s (µC’s) RESET pin with a single pull-up resistor allows either device to assert reset (Figure 5). G697L Open-Drain RESET Output Allows Use with Multiple Supplies Generally, the pull-up connected to the G697L 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 6). Note that as the G697L’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 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. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.1 Jul 26, 2002 7 Global Mixed-mode Technology Inc. G696/G697 Package Information C D L E H θ1 e1 e A A2 A1 b Note: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance ±0.1000 mm (4mil) unless otherwise specified 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane SYMBOLS A A1 A2 b C D E e e1 H L θ1 MIN DIMENSIONS IN MILLIMETERS NOM 1.00 0.00 0.70 0.35 0.10 2.70 1.40 --------2.60 0.37 1º 1.10 ----0.80 0.40 0.15 2.90 1.60 1.90(TYP) 0.95 2.80 -----5º MAX 1.30 0.10 0.90 0.50 0.25 3.10 1.80 --------3.00 ----9º Taping Specification Feed Direction SOT23-5 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: 1.1 Jul 26, 2002 8