SGM706-SYS8G/TR

SGM706 Low-Cost, Microprocessor Supervisory Circuit GENERAL DESCRIPTION FEATURES The SGM706 microprocessor supervisory circuit reduces  Precision Supply-Voltage Monitor the complexity and number of components required to 4.65V for SGM706-L monitor 4.40V for SGM706-M power-supply and monitor microprocessor activity. It significantly improves system reliability and 4.0V for SGM706-J accuracy 3.08V for SGM706-T compared to separate ICs or discrete components. 2.93V for SGM706-S 2.63V for SGM706-R The SGM706 provides power-supply monitoring circuitry  Guaranteed RESET Valid at VCC = 1V that power-up,  200ms Reset Pulse Width power-down and brownout conditions. The reset output  Debounced TTL/CMOS-Compatible generates a reset output during remains operational with VCC as low as 1V. Independent Manual-Reset Input watchdog monitoring circuitry is also provided. This is  Independent Watchdog Timer (1.6sec) Timeout activated if the watchdog input has not been toggled  Voltage Monitor for Power-Fail or Low-Battery Warning within 1.6 seconds.  -40℃ to +85℃ Operating Temperature Range  Green SOIC-8 Package In addition, there is a 1.25V threshold detector for power-fail warning, low-battery detection, or monitoring an additional power supply. An active-low manual-reset input ( MR) is also included. The SGM706 is available in Green SOIC-8 package. It operates over an ambient temperature range of -40℃ to +85℃. APPLICATIONS Computers Controllers Intelligent Instruments Automotive Systems Critical μP Power Monitoring SG Micro Corp www.sg-micro.com REV. A. 2 Low-Cost, Microprocessor Supervisory Circuit SGM706 PACKAGE/ORDERING INFORMATION MODEL SGM706 RESET THRESHOLD (V) PACKAGE DESCRIPTION ORDERING NUMBER PACKAGE MARKING PACKAGE OPTION 4.65 SOIC-8 SGM706-LYS8G/TR SGM706-LYS8 Tape and Reel, 2500 4.40 SOIC-8 SGM706-MYS8G/TR SGM706-MYS8 Tape and Reel, 2500 4.0 SOIC-8 SGM706-JYS8G/TR SGM706-JYS8 Tape and Reel, 2500 3.08 SOIC-8 SGM706-TYS8G/TR SGM706-TYS8 Tape and Reel, 2500 2.93 SOIC-8 SGM706-SYS8G/TR SGM706-SYS8 Tape and Reel, 2500 2.63 SOIC-8 SGM706-RYS8G/TR SGM706-RYS8 Tape and Reel, 2500 NOTE: Order number is defined as the follow: ORDER NUMBER SGM 706- X Y X G / TR ABSOLUTE MAXIMUM RATINGS (Typical values are at TA = +25℃, unless otherwise noted.) Tape and Reel Green product Package Type S8 SOIC-8 Operating Temperature Range Y -40℃ to +85℃ RESET THRESHOLD L: 4.65V M:4.40V J: 4.0V T: 3.08V S: 2.93V R: 2.63V CAUTION This integrated circuit can be damaged by ESD if you don’t pay attention to ESD protection. SGMICRO recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. Terminal Voltage (with respect to GND) VCC....................................................................... -0.3V to 6.0V All Other Inputs........................................ -0.3V to (VCC + 0.3V) Input Current, VCC..............................................................20mA GND................................................................................. 20mA Output Current, (all outputs).............................................. 20mA Operating Temperature Range........................... -40℃ to +85℃ Junction Temperature....................................................... 150℃ Storage Temperature........................................ -65℃ to +150℃ Lead Temperature (Soldering, 10sec).............................. 260℃ ESD Susceptibility HBM..................................................................................4000V MM......................................................................................300V NOTE: 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. SGMICRO reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. Please contact SGMICRO sales office to get the latest datasheet. SG Micro Corp www.sg-micro.com 2 Low-Cost, Microprocessor Supervisory Circuit SGM706 TYPICAL OPERATION CIRCUIT UNREGULATED DC +5V DC LINEAR REGULATOR MICROPROCESSOR VCC VCC PFI MR RESET SGM706 WDI WDO PFO RESET I/O LINE NMI INTERRUPT PUSHBUTTON SWITCH SG Micro Corp www.sg-micro.com 3 Low-Cost, Microprocessor Supervisory Circuit SGM706 PIN CONFIGURATION (TOP VIEW) MR 1 8 WDO VCC 2 7 RESET GND 3 6 WDI PFI 4 5 PFO SGM706 SOIC-8 PIN DESCRIPTION PIN NAME FUNCTION 1 MR Manual-Reset Input triggers a reset pulse when pulled below 0.8V. This active-low input has an internal 250μA (VCC = +5V) pull-up current. It can be driven from a TTL or CMOS logic line as well as shorted to ground with a switch. 2 VCC Power Supply Voltage that is monitored. 3 GND 4 PFI Power-Fail Voltage Monitor Input. When PFI is less than 1.25V, PFO goes low. Connect PFI to GND or VCC when not used. 5 PFO Power-Fail Output goes low and sinks current when PFI is less than 1.25V; otherwise PFO stays high. WDI Watchdog Input. If WDI remains high or low for 1.6sec, the internal watchdog timer runs out and WDO goes low (BLOCK DIAGRAM). Floating WDI or connecting WDI to a high-impedance three-state buffer disables the watchdog feature. The internal watchdog timer clears whenever reset is asserted, WDI is three-stated, or WDI sees a rising or falling edge. RESET Active-Low Reset Output pulses low for 200ms when triggered, and stays low whenever VCC is below the reset threshold (4.65V for SGM706-L, 4.4V for SGM706-M, 4.0V for SGM706-J, 3.08V for SGM706-T and 2.93V for SGM706-S, 2.63V for SGM706-R). It remains low for 200ms after VCC rises above the reset threshold or MR goes from low to high. A watchdog timeout will not trigger RESET unless WDO is connected to MR. WDO Watchdog Output pulls low when the internal watchdog timer finishes its 1.6sec count and does not go high again until the watchdog is cleared. WDO also goes low during low-line conditions. Whenever VCC is below the reset threshold, WDO stays low; however, unlike RESET , WDO does not have a minimum pulse width. As soon as VCC rises above the reset threshold, WDO goes high with no delay. 6 7 8 0V Ground Reference for all signals. SG Micro Corp www.sg-micro.com 4 Low-Cost, Microprocessor Supervisory Circuit SGM706 ELECTRICAL CHARACTERISTICS (VCC = 4.75V to 5.5V for SGM706-L; VCC = 4.5V to 5.5V for SGM706-M; VCC = 4.07V to 5.5V for SGM706-J; VCC = 3.14V to 5.5V for SGM706-T; VCC = 2.95V to 5.5V for SGM706-S; VCC = 2.68V to 5.5V for SGM706-R; TA = -40°C to +85°C, unless otherwise noted.) PARAMETER CONDITIONS Operating Voltage Range (VCC) MIN Reset Threshold Hysteresis 4.25 4.4 4.5 SGM706-J 3.91 4.0 4.07 SGM706-T 3.02 3.08 3.14 SGM706-S 2.85 2.93 2.95 SGM706-R 2.56 2.63 2.68 SGM706-L, SGM706-M 40 SGM706-J 34 SGM706-T, SGM706-S 25 SGM706-R 22 Isink = 3.2mA 0.4 V 0.3 VCC - 1.5 1.0 1.6 VCC = 5V VRST(MAX) < VCC < 3.6V High VRST(MAX) < VCC < 3.6V ISOURCE = 800μA ns 3.5 0.8 50 -150 150 -50 VCC - 1.5 0.4 100 600 250 Low High TA = +25℃ 0.8 2 350 VCC = 5V 1.18 PFI Input Current PFO Output Voltage SG Micro Corp www.sg-micro.com 1.25 1.3 0.2 ISOURCE = 800μA Isink = 3.2mA μA V μA ns MR to Reset Out Delay (tMD) PFI Input Threshold V 0.7 × VCC Isink = 1.2mA MR = 0V sec 0.8 WDI = VCC WDI = 0V 2.25 70 VCC = 5V MR Pulse Width (tMR) MR Input Threshold mV VCC = 1V, Isink = 50μA Low MR Pull-Up Current V ms High WDO Output Voltage 200 UNITS 280 VIL = 0.4V, VIH = VCC WDI Input Current 4.75 SGM706-M Watchdog Timeout Period (tWD) WDI Input Threshold μA 4.65 120 Low V 150 4.5 ISOURCE = 800μA WDI Pulse Width (tWP) 5.5 50 SGM706-L Reset Pulse Width (tRS) RESET Output Voltage MAX 1.0 Supply Current (ISUPPLY) Reset Threshold (VRT) TYP V ns V nA VCC - 1.5 0.4 V 5 Low-Cost, Microprocessor Supervisory Circuit SGM706 BLOCK DIAGRAM WDI WATCHDOG TRANSITION DETECTOR 6 WATCHDOG TIMER VCC 8 WDO TIMEBASE FOR RESET AND WATCHDOG 250µA 1 MR RESET GENERATOR VCC 2 RESET + _ 4.65V for SGM706-L* PFI 7 4 SGM706 + _ 5 PFO 1.25V 3 GND * 4.65V for SGM706-L 4.40V for SGM706-M 4.0V for SGM706-J 3.08V for SGM706-T 2.93V for SGM706-S 2.63V for SGM706-R SG Micro Corp www.sg-micro.com 6 Low-Cost, Microprocessor Supervisory Circuit SGM706 TYPICAL PERFORMANCE CHARACTERISTICS VCC VCC RESET GND PFI + - RESET 2kΩ VCC 10kΩ VCC GND RESET 330pF RESET 30pF +5V PFO 30pF +5V 1kΩ +1.25V PFI + PFO - 30pF 1kΩ +1.25V SG Micro Corp www.sg-micro.com 7 SGM706 Low-Cost, Microprocessor Supervisory Circuit TYPICAL PERFORMANCE CHARACTERISTICS SG Micro Corp www.sg-micro.com 8 Low-Cost, Microprocessor Supervisory Circuit SGM706 APPLICATION NOTES Ensuring a Valid RESET Output Down to VCC = 0V When VCC falls below 1V, the SGM706 RESET output no longer sinks current—it becomes an open circuit. High-impedance CMOS logic inputs can drift to undetermined voltages if left undriven. If a pull-down resistor is added to the RESET pin as shown in Figure 1, any stray charge or leakage currents will be drained to ground, holding RESET low. Resistor value (R1) is not critical. It should be about 100kΩ, large enough not to load RESET and small enough to pull RESET to ground. Monitoring a Negative Voltage The power-fail comparator can also monitor a negative supply rail (Figure 3). When the negative rail is good (a negative voltage of large magnitude), PFO is low, and when the negative rail is degraded (a negative voltage of lesser magnitude), PFO is high. By adding the resistors and transistor as shown, a high PFO triggers reset. As long as PFO remains high, the SGM706 will keep reset asserted ( RESET = low, RESET = high). Note that this circuit’s accuracy depends on the PFI threshold tolerance, the VCC line, and the resistors. +5V 100kΩ VCC R1 SGM706 MR SGM706 PFI RESET R1 PFO RESET R2 GND 100kΩ 2N3904 TO μP V- Figure 1. RESET Valid to Ground Circuit Monitoring Voltages Other Than the Unregulated DC Input Monitor voltages other than the unregulated DC by connecting a voltage divider to PFI and adjusting the ratio appropriately. If required, add hysteresis by connecting a resistor (with a value approximately 10 times the sum of the two resistors in the potential divider network) between PFI and PFO . A capacitor between PFI and GND will reduce the power-fail circuit’s sensitivity to high-frequency noise on the line being monitored. RESET can be asserted on other voltages in addition to the +5V VCC line. Connect PFO to MR to initiate a RESET pulse when PFI drops below 1.25V. Figure 2 shows the SGM706 configured to assert RESET when the +5V supply falls below the reset threshold, or when the +12V supply falls below approximately 11V. MR +5V 0V +5V PFO 0V V- 5 – 1.25 1.25 - VTRIP = R2 R1 Interfacing to μPs with Bidirectional Reset Pins μPs with bidirectional reset pins, such as the Motorola 68HC11 series, can contend with the SGM706 RESET output. If, for example, the RESET output is driven high and the Microprocessor wants to pull it low, indeterminate logic levels may result. To correct this, connect a 4.7kΩ resistor between the RESET output and the μP reset I/O, as in Figure 4. Buffer the RESET output to other system components. BUFFRED RESET TO OTHER SYSTEM COMPONENTS VCC 130kΩ 1% VTRIP < 0 Figure 3. Monitoring a Negative Voltage +12V +5V 1MΩ 1% 0V VTRIP RESET SGM706 TO µP MR VCC VCC RESET PFI GND PFO Figure 2. Monitoring Both +5V and +12V SG Micro Corp www.sg-micro.com Microprocessor SGM706 GND 4.7kΩ RESET GND Figure 4. Interfacing to Microprocessors with Bidirectional Reset I/O 9 Low-Cost, Microprocessor Supervisory Circuit SGM706 PACKAGE OUTLINE DIMENSIONS SOIC-8 0.6 D e 2.2 E1 E 5.2 b 1.27 RECOMMENDED LAND PATTERN (Unit: mm) L A A1 θ c A2 Symbol Dimensions In Millimeters MIN MAX Dimensions In Inches MIN MAX A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.27 BSC 0.050 BSC L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° SG Micro Corp www.sg-micro.com 10 Low-Cost, Microprocessor Supervisory Circuit SGM706 TAPE AND REEL INFORMATION REEL DIMENSIONS TAPE DIMENSIONS P2 W P0 Q1 Q2 Q1 Q2 Q1 Q2 Q3 Q4 Q3 Q4 Q3 Q4 B0 Reel Diameter P1 A0 K0 DIRECTION OF FEED Reel Width (W1) NOTE: The picture is only for reference. Please make the object as the standard. KEY PARAMETER LIST OF TAPE AND REEL Package Type Reel Diameter Reel Width W1 (mm) A0 (mm) B0 (mm) K0 (mm) P0 (mm) P1 (mm) P2 (mm) W (mm) Pin1 Quadrant SOIC-8 13″ 12.4 6.4 5.4 2.1 4.0 8.0 2.0 12.0 Q1 SG Micro Corp www.sg-micro.com 11 Low-Cost, Microprocessor Supervisory Circuit SGM706 CARTON BOX DIMENSIONS NOTE: The picture is only for reference. Please make the object as the standard. KEY PARAMETER LIST OF CARTON BOX Reel Type Length (mm) Width (mm) Height (mm) Pizza/Carton 13″ 386 280 370 5 SG Micro Corp www.sg-micro.com 12