Global Mixed-mode Technology Inc. G698/G699 Microprocessor Reset IC Features General Description Precision Monitoring of +3V, +3.3V, and +5V The G698/G699 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 (G698L) Push-Pull RESET Output (G698H) Open-Drain RESET Output (G699L) Externally Programmable Time Delay Generator 14µA Supply Current Guaranteed Reset Valid to VCC = 0.8V Power Supply Transient Immunity 5 pin SOT23-5 Packages 2% Threshold Accuracy 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 programmable time delay generator after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The G699L has an open-drain output stage, while the G698 have push-pull outputs. The G699L’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The G698L have an active-low RESET output, while the G698H 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. Applications Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive Low supply current makes the G698/G699 ideal for use in portable equipment. The G698/G699 are available in 5-pin SOT23-5 packages. Ordering Information ORDER NUMBER TEMP. RANGE G698H(L)xxxT1U G699LxxxT1U -40°C ~ +105°C -40°C ~ +105°C PACKAGE SOT23-5 SOT23-5 Note:T1 : SOT23-5 U : Tape & Reel * xxx specifies the threshold voltage. e.g. 263 denotes the 2.63V threshold voltage. Pin Configuration Typical Application Circuit VCC CD 1 5 VCC VCC VCC Rpull-up* GND 2 G698/G699 G698/G699 CD GND 3 4 RESET (RESET) RESET (RESET) GND µP RESET INPUT GND CD SOT23-5 ()is for G698H *G699 ONLY TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.3 Jun 03, 2004 1 Global Mixed-mode Technology Inc. Absolute Maximum Ratings G698/G699 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).….….………+260°C 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) 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 permanent 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 Hysterisis Reset Threshold Tempco CD Delay Pin Threshold Voltage Delay Capacitor Pin Sink Current Delay Capacitor Pin Source Current VHYS RESET Output Current Low (push-pull active low, and open-drain active-low, G698L and G699L) RESET Output Current High (push-pull active low, G698L) RESET Output Current Low (push-pull active high, G698H) RESET Output Current High (push-pull active high, G698H) RESET Open-Drain Output Leakage Current (G699L) 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_ 5.5 5.5 25 22 4.69 4.40 4.04 3.37 3.16 2.96 2.69 7 --1.29 --1.2 % ppm/°C V mA µA 8 --- --- mA 4.5 --- --- 3 --- --- 2 --- --- 16 --- --- 12 --- --- 10 --- --- VCC = 2.5V, VRESET = 2V 2 --- --- mA VCC > VTH, RESET deasserted --- --- 1 µA VCC = 1.5V, VCD = 0.5V VCC > VTH- + VHYS IOL VCC = 2.5V, V RESET = 0.5V IOH UNIT ----16.5 13.9 4.60 4.32 3.96 3.30 3.10 2.91 2.64 5.3 70 1.25 5 0.88 ICD IOL TYP MAX 0.8 1 ----4.50 4.23 3.88 3.25 3.04 2.86 2.59 3.6 --0.87 3 0.5 VTDC IOH MIN VCC = 5V, V RESET = 4.5V, G698L463/438/400/330 VCC = 3.3V, V RESET = 2.8V, G698L308/293 VCC = 3V, V RESET = 2.5V, G698L263 VCC = 5V, VRESET = 0.5V, G698H463/438/400/330 VCC = 3.3V, VRESET = 0.5V, G698H308/293 VCC = 3V, VRESET = 0.5V, G698H263 V µA V mA mA Note 1: Production testing done at TA = +25°C; limits over temperature guaranteed by design. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.3 Jun 03, 2004 2 Global Mixed-mode Technology Inc. G698/G699 Selector Guide PART/SUFFIX RESET THRESHOLD (V) OUTPUT TYPE TOP MARK G699L463T1U 4.60 Open-Drain RESET 699Gx G699L438T1U 4.32 Open-Drain RESET 699Fx G699L400T1U 3.96 Open-Drain RESET 699Ex G699L330T1U 3.30 Open-Drain RESET 699Dx G699L308T1U 3.10 Open-Drain RESET 699Cx G699L293T1U 2.91 Open-Drain RESET 699Bx G699L263T1U G698H463T1U G698H438T1U G698H400T1U G698H330T1U G698H308T1U G698H293T1U G698H263T1U G698L463T1U 2.64 4.60 4.32 3.96 3.30 3.10 2.91 2.64 4.60 Open-Drain RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET 699Ax 698Lx 698Kx 698Jx 698Nx 698Ix 698Hx 698Gx 698Fx G698L438T1U 4.32 Push-Pull RESET 698Ex G698L400T1U 3.96 Push-Pull RESET 698Dx G698L330T1U 3.30 Push-Pull RESET 698Mx G698L308T1U 3.10 Push-Pull RESET 698Cx G698L293T1U 2.91 Push-Pull RESET 698Bx G698L263T1U 2.64 Push-Pull RESET 698Ax Push-Pull RESET TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.3 Jun 03, 2004 3 G698/G699 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 Curremt vs. Temperature (No Load) Supply Current vs. VCC 8 7 7 6 VCC=5V 5 4 3 VCC=3.3V 5 Supply Current (µA) Supply Current (µA) 6 4 VCC=2.5V 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 -40 5.5 6 -20 0 20 VCC (V) 60 80 Output Time Delay vs. Capacitance Normalized Reset Threshold vs. Temperature 1.06 10000 1.05 1.04 1000 VT Delay between VCC>VTH to output change 1.03 Output Time Delay Normalized Ormalized V TH+ , VTH- (V) 40 Temperature (°C) 1.02 1.01 VTH 1 0.99 0.98 100 10 1 Delay between VCC<VTH to output change 0.97 0.96 -40 -30 -20 -10 0 0.1 10 20 27 30 40 50 60 70 80 90 0.0001 0.001 0.1 1 Reset Output Time Delay vs. Temperature CD Delay Pin Sink Current vs. Voltage 40 300 VCC=3V 35 250 30 Output Time Delay (ms) ICD, CD DELAY PIN SINK CURRENT (mA) 0.01 CD, Delay Pin Capacitance (µF) TA, Ambient Temperature (°C) VCC=2.5V 25 20 15 10 VCC=1.5V 200 CD=0.1µF 150 100 50 5 0 0 0.05 0.2 0.4 0.6 1.2 1.8 2.4 3 -40 VCD, Delay Pin Voltage (V) -30 -20 -10 0 10 20 30 40 50 60 70 80 90 TA, Ambient Temperature (°C) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.3 Jun 03, 2004 4 G698/G699 Global Mixed-mode Technology Inc. Timing Diagram VCC V TH+ VTH- VCC, Pin 5 VCC CD, Pin 1 0.675 V IN VCC Reset Output (Active Low), Pin 4 V TH0V V CC Reset Output (Active High), Pin 4 V TH0V tD2 Figure 1 Functional Diagram 2 VCC 2 ICD + * RESET ICD 1 VTH 3 GND 5 () is for G698H 1 VCC RESET (RESET) + VTH 3 CD GND 5 CD Figure 2 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.3 Jun 03, 2004 5 Global Mixed-mode Technology Inc. G698/G699 Pin Description PIN NAME 1 2.3 CD GND 4 RESET (G698L/G699L) RESET (G698H) 5 VCC FUNCTION External Programmable time delay is set by the capacitor connect to CD pin. Ground 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) 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 G699L/G698L/G698H 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 G699L uses an open-drain output, and the G698L/G698H have a push-pull output stage. Connect a pull-up resistor on the G699L’s RESET output to any supply between 0 and 5.5V. to ground, holding RESET low (Figure 3). 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 G699L 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 current ICD. When the voltage at CD pin exceeds the buffer threshold, typically 1.25V, 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. G698 RESET GND Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 0.8V, the G698 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 R1 100k Figure3. RESET Valid to VCC = Ground Circuit TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.3 Jun 03, 2004 6 G698/G699 Global Mixed-mode Technology Inc. Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the G699L 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- +5.0 +5.0V +3.3V VCC VCC rectly to the microcontroller’s (µC’s) RESET pin with a single pull-up resistor allows either device to assert reset (Figure 4). RPULL-UP G699 RESET 5V SYSTEM RESET INPUT VCC GND GND VCC VCC RPULL-UP G699 RESET GND µP RESET MOTOROLA INPUT 68HCXX Figure 5. G699L Open-Drain RESET Output Allows Use with Multiple Supplies GND 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. Figure 4. Interfacing to µPs with Bidirectional Reset I/O G699L Open-Drain RESET Output Allows Use with Multiple Supplies Generally, the pull-up connected to the G699L 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 5). Note that as the G699L’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. 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: 1.3 Jun 03, 2004 7 Global Mixed-mode Technology Inc. G698/G699 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 SYMBOL A A1 A2 b C D E e e1 H L θ1 MIN DIMENSIONS IN MILLIMETER 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: 1.3 Jun 03, 2004 8