SGM811 SGM812 Microprocessor Supervisory with Manual Reset Input GENERAL DESCRIPTION FEATURES The SGM811/SGM812 supervisory circuits monitor the power supply voltage in microprocessor and digital systems. The SGM811/SGM812 is designed to monitor seven different voltages, these voltages have been selected for the effective monitoring of 2.5V, 3 V, 3.3 V, and 5 V supply voltage levels. − Superior Upgrade for MAX811/MAX812 and ADM811/ADM812 − Specified over Temperature − Low Power Consumption (17 μA Typ) − Precision Voltage Monitor: 2.5V,3 V, 3.3 V, 5 V Options − Reset Assertion Down to 1 V VCC − 160 ms Min Power-On Reset Logic Low RESET Output (SGM811) Logic High RESET Output (SGM812) − Manual Reset Input − Compact 4-Pin SOT143 and 5-Pin SOT23 Packages They provide a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 240 ms. This holds the microprocessor in a reset state until conditions have stabilized. The RESET output remains operational with VCC as low as 1 V. The SGM811 provides an active low reset signal ( RESET ) while the SGM812 provides an active high signal (RESET) output. The SGM811/SGM812 has a manual reset input. The manual reset function is very useful, especially if the circuit in which the SGM811/SGM812 is operating enters into a state that can only be detected by the user. Allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out-of-control or locked system. The devices come in a 4-pin SOT143 and 5-pin SOT23 packages. PIN CONFIGURATIONS（TOP VIEW） SOT143-4 GND RESET/RESET 1 2 4 VCC 3 MR 5 VCC 4 MR APPLICATIONS SOT23-5 Microprocessor Systems Controllers Intelligent Instruments Automotive Systems Safety Systems Portable Instruments GND 1 NC 2 RESET/RESET 3 TYPICAL OPERATION CIRCUIT VCC VCC MICROPROCESSOR SYSTEM SGM811 RESET MR RESET 100KO GND Shengbang Microelectronics Co, Ltd Tel: 86/451/84348461 www.sg-micro.com GND Nov 2006 ORDERING INFORMATION ORDERING NUMBER RESET THRESHOLD (V) PECKAGE TYPE SPECIFIED TEMPERATURE RANGE PACKAGE MARKING PACKAGE OPTION SGM811-LXN5 4.63 SOT23-5 - 40°C to +125°C 811L Tape and Reel, 3000 SGM811-M XN5 4.38 SOT23-5 - 40°C to +125°C 811M Tape and Reel, 3000 SGM811-JXN5 4.00 SOT23-5 - 40°C to +125°C 811J Tape and Reel, 3000 SGM811-T XN5 3.08 SOT23-5 - 40°C to +125°C 811T Tape and Reel, 3000 SGM811-S XN5 2.93 SOT23-5 - 40°C to +125°C 811S Tape and Reel, 3000 SGM811-R XN5 2.63 SOT23-5 - 40°C to +125°C 811R Tape and Reel, 3000 SGM811-Z XN5 2.32 SOT23-5 - 40°C to +125°C 811Z Tape and Reel, 3000 SGM811-LXKA4 4.63 SOT143-4 - 40°C to +125°C 811L Tape and Reel, 3000 SGM811-MX KA4 4.38 SOT143-4 - 40°C to +125°C 811M Tape and Reel, 3000 SGM811-JX KA4 4.00 SOT143-4 - 40°C to +125°C 811J Tape and Reel, 3000 SGM811-TX KA4 3.08 SOT143-4 - 40°C to +125°C 811T Tape and Reel, 3000 SGM811-SX KA4 2.93 SOT143-4 - 40°C to +125°C 811S Tape and Reel, 3000 SGM811-RX KA4 2.63 SOT143-4 - 40°C to +125°C 811R Tape and Reel, 3000 SGM811-Z X KA4 2.32 SOT143-4 - 40°C to +125°C 811Z Tape and Reel, 3000 SGM812-LXN5 4.63 SOT23-5 - 40°C to +125°C 812L Tape and Reel, 3000 SGM812-M XN5 4.38 SOT23-5 - 40°C to +125°C 812M Tape and Reel, 3000 SGM812-JXN5 4.00 SOT23-5 - 40°C to +125°C 812J Tape and Reel, 3000 SGM812-T XN5 3.08 SOT23-5 - 40°C to +125°C 812T Tape and Reel, 3000 SGM812-S XN5 2.93 SOT23-5 - 40°C to +125°C 812S Tape and Reel, 3000 SGM812-R XN5 2.63 SOT23-5 - 40°C to +125°C 812R Tape and Reel, 3000 SGM812-Z XN5 2.32 SOT23-5 - 40°C to +125°C 812Z Tape and Reel, 3000 SGM812-LX KA4 4.63 SOT143-4 - 40°C to +125°C 812L Tape and Reel, 3000 SGM812-MX KA4 4.38 SOT143-4 - 40°C to +125°C 812M Tape and Reel, 3000 SGM812-JX KA4 4.00 SOT143-4 - 40°C to +125°C 812J Tape and Reel, 3000 SGM812-TX KA4 3.08 SOT143-4 - 40°C to +125°C 812T Tape and Reel, 3000 SGM812-SX KA4 2.93 SOT143-4 - 40°C to +125°C 812S Tape and Reel, 3000 SGM812-RX KA4 2.63 SOT143-4 - 40°C to +125°C 812R Tape and Reel, 3000 SGM812-Z X KA4 2.32 SOT143-4 - 40°C to +125°C 812Z Tape and Reel, 3000 2 SGM811/812 ELECTRICAL CHARACTERISTICS (VCC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.) PARAMETER SUPPLY Voltage CONDITIONS MIN MAX UNITS TA = 0°C to 70°C 1.0 5.5 V TA = - 40°C to +125°C 1.2 5.5 V 20 30 µA 50 µA 17 25 µA 45 µA 4.723 V 4.86 V 4.38 4.468 V 4.56 V 4.00 4.08 V 4.2 V 3.08 3.157 V 3.23 V 3.003 V 3.08 V 2.63 2.696 V 2.76 V 2. 23 2.378 V 2.42 V VCC < 5.5 V, SGM81_L/M/J, TA = 25°C Current TYP VCC < 5.5 V, SGM81_L/M/J, TA = - 40°C to +125°C VCC < 3.6 V, SGM81_R/S/T/Z, TA = 25°C VCC < 3.6 V, SGM81_R/S/T/Z, TA = - 40°C to +125°C RESET VOLTAGE THRESHOLD SGM81_L SGM81_M SGM81_J SGM81_T SGM81_S SGM81_R SGM81_Z TA = 25°C 4.537 TA = - 40°C to +125°C 4.40 TA = 25°C 4.292 TA = - 40°C to +125°C 4.16 TA = 25°C 3.92 TA = - 40°C to +125°C 3.8 TA = 25°C 3.003 TA = - 40°C to +125°C 2.92 TA = 25°C 2.857 TA = - 40°C to +125°C 2.78 TA = 25°C 2.564 TA = - 40°C to +125°C 2.50 TA = 25°C 2.262 TA = - 40°C to +125°C 2.22 RESET THRESHOLD Temperature Coefficient VCC to RESET/ RESET Delay VCC = VTH to (VTH –100 mV) TA = 4.63 - 40°C to +85°C 160 TA = - 40°C to +125°C 100 2.93 30 ppm/°C 20 µs 240 560 ms 840 ms Reset Active Timeout Period MANUAL RESET Minimum Pulsewidth 10 Glitch Immunity RESET/ RESET Propagation Delay Pull-Up Resistance µs 100 ns 0.5 µs 1 MΩ The Manual Reset Circuit Will Act On: An Input Rising Above VCC > VTH(MAX), SGM81_L/M/J An Input Falling Below VCC > VTH(MAX), SGM81_L/M/J An Input Rising Above VCC > VTH(MAX), SGM81_R/S/T/Z An Input Falling Below VCC > VTH(MAX), SGM81_R/S/T/Z 2.3 V 0.8 3 0.7×VCC V V 0.25×VCC V SGM811/812 ELECTRICAL CHARACTERISTICS (continued) (VCC Typ = 5 V for L/M/J Models, 3.3 V for T/S Models, 3 V for R Models, 2.5 V for Z Models; unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS RESET/ RESET OUTPUT VOLTAGE Low (SGM811R/S/T/Z) VCC = VTH(MIN), ISINK = 1.2mA 0.3 V Low (SGM811L/M/J) VCC = VTH(MIN), ISINK = 3.2mA 0.4 V VCC > 1.0 V, ISINK = 50µA 0.3 V Low (SGM811R/S/T/Z/L/M/J) High (SGM811R/S/T/Z) VCC > VTH(MAX), ISOURCE = 500µA 0.8×VCC V High (SGM811L/M/J) VCC > VTH(MAX), ISOURCE = 800µA VCC– 1.5 V Low (SGM812R/S/T/Z) VCC = VTH(MAX), ISINK = 1.2mA 0.3 V Low (SGM812L/M/J) VCC = VTH(MAX), ISINK = 3.2mA 0.4 V High (SGM812 R/S/T/Z/L/M/J) 1.8 V < VCC < VTH(MIN), ISOURCE = 150µA 0.8×VCC V Specifications subject to change without notice. ABSOLUTE MAXIMUM RATINGS (Typical values are at TA = 25°C, unless otherwise noted.) Terminal Voltage (With Respect to Ground) VCC................................................................................–0.3 V to +6 V All Other Inputs ............................................ –0.3 V to VCC + 0.3 V Input Current VCC , MR ................................................................................ 20 mA Output Current RESET, RESET ..................................................................... 20 mA Power Dissipation, PD @ TA = 25℃ SOT23-5 .....................................................................................0.4W SOT143-4.................................................................................. 0.32W Operating Temperature Range...........................- 40°C to +125°C Junction Temperature...........................................................+150°C Storage Temperature.............................................- 65°C to +150°C Lead Temperature (soldering, 10s).....................................+260°C ESD Susceptibility HBM..........................................................................................4000V MM..............................................................................................400V 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. PIN DESCRIPTION Pin Number SGM811 SGM812 SOT143-4 SOT23-5 SOT143-4 NAME GND 1 NC RESET 1 1 FUNCTION Ground No connect. 2 2 3 — RESET — — 2 MR 3 4 3 VCC 4 5 4 Active Low Logic Output. RESET remains low while VCC is below the reset threshold or when MR is low; RESET then remains low for at least 160 ms after VCC rises above the reset threshold. Active High Logic Output. RESET remains high while VCC is below the reset threshold or when MR is low; RESET then remains high for 240 ms (typical) after VCC rises above the reset threshold. Manual Reset. This active low debounced input will ignore input pulses of 100 ns or less (typical) and is guaranteed to accept input pulses of greater than 10 µs. Leave floating when not used. Power supply voltage that is monitored. 4 SGM811/812 TYPICAL PERFORMANCE CHARACTERISTICS Power-Down RESET Delay vs.Temperature Power-Down RESET Delay vs.Temperature 300 250 SGM811T/S/R VOD = VTH - VCC Power-Down RESET (µS) Power-Down RESET (µS) SGM811L/M/J 200 VOD = 10mV 150 VOD = 20mV 100 VOD = 200mV VOD = 100mV 50 200 VOD = 20mV 150 100 -50 -30 -10 10 30 50 70 90 -50 -30 -10 110 130 30 50 70 90 110 130 Supply Current vs. Temperature (No Load) Power-Up RESET Delay vs.Temperature 30 264 262 10 Temperature(℃) Temperature(℃) SGM811S VCC = 5.5V 25 260 Supply Current (µA) Power-Down RESET (mS) VOD = 200mV VOD = 100mV 50 0 0 258 256 254 252 250 248 20 VCC = 3.6V 15 10 5 0 -50 -30 -10 10 30 50 70 90 110 130 -50 -30 -10 Temperature(℃) 10 30 50 70 90 110 130 Temperature(℃) Normalized RESET Voltage Threshold vs. Temperature Maximum Transient Duration Without Causing a Reset Pulse vs. RESET Comparator Overdrive Maximum Transient Duration (µS) 1.008 Normalized RESET Threshold VOD = VTH - VCC VOD = 10mV 250 1.006 1.004 1.002 1 0.998 0.996 0.994 0.992 0.99 0.988 400 350 300 SGM811L/M/J 250 200 150 100 50 SGM811T/S/R 0 -50 -30 -10 10 30 50 70 90 110 130 1 10 100 1000 RESET Comparator Overdrive, VTH - VCC(mV) Temperature(℃) ５ SGM811/812 TYPICAL PERFORMANCE CHARACTERISTICS RESET Output Voltage vs. Supply Voltage Supply Voltage 5VP-P 2V/div RESET Output Voltage SGM811R SGM811S 200ms/div ６ SGM811/812 APPLICATION NOTES MANUAL RESET RESET OUTPUT The SGM811/SGM812 is equipped with a manual reset input This input is designed to operate in a noisy environment where unwanted glitches could be induced. These glitches could be produced by the bouncing action of a switch contact, or where a manual reset switch may be located some distance away from the circuit (the cabling of which may pick-up noise). The manual reset input is guaranteed to ignore logically valid inputs that are faster than 100 ns and to accept inputs longer in duration than 10 µs. On power-up and after VCC rises above the reset threshold, an internal timer holds the reset output active for 240 ms (typical). This is intended as a power-on reset signal for the processor. It allows time for both the power supply and the microprocessor to stabilize after power-up. If a power supply brownout or interruption occurs, the reset output is similarly activated and remains active for 240 ms (typical) after the supply recovers. This allows time for the power supply and microprocessor to stabilize. The SGM811 provides an active low reset output ( RESET ) while the SGM812 provides an active high output ( RESET ). During power-down of the SGM811, the RESET output remains valid (low) with VCC as low as 1 V. This ensures that the microprocessor is held in a stable shutdown condition as the supply falls and also ensures that no spurious activity can occur via the microprocessor as it powers up. BENEFITS OF A VERY ACCURATE RESET THRESHOLD Because the SGM811/SGM812 can operate effectively even when there are large degradations of the supply voltages, the possibility of a malfunction during a power failure is greatly reduced. Another advantage of the SGM811/SGM812 is its very accurate internal voltage reference circuit. Combined, these benefits produce an exceptionally reliable microprocessor supervisory circuit. Glitch Immunity The SGM811/SGM812 contains internal filtering circuitry providing glitch immunity from fast transient glitches on the power supply line. VCC VCC SGM811 VCC VREF VREF VREF VREF RESET RESET t1 t1 GND t1= RESET Time = 240ms Typical VREF = RESET Voltage Threshold Figure 1. Ensuring a Valid RESET Output Down to VCC = 0V Figure 2. Power Fail RESET Timing ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V INTERFACING TO OTHER DEVICES Output When VCC falls below1.0 V, the SGM811/SGM812’s RESET no longer sinks current. Therefore, a high impedance CMOS logic input connected to RESET may drift to undetermined logic levels. To eliminate this problem, a 100 k Ω resistor should be connected from RESET to ground. The SGM811/SGM812 is designed to integrate with as many devices as possible. One feature of the SGM811/SGM812 is the reset output, which is directly proportional to VCC (this is guaranteed only while VCC is greater than 1 V). This enables the part to be used with both 3 V and 5 V, or any nominal voltage within the minimum and maximum specifications for VCC. ７ SGM811/812 PACKAGE OUTLINE DIMENSIONS SOT23-5 D θ b 0.20 Symbol L E E1 e C A1 e1 Min Max Min Max 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e1 L A A2 Dimensions In Inches 1.050 e ８ Dimensions In Millimeters A L 0 0.950TYP 1.800 2.000 0.700REF 0.037TYP 0.071 0.079 0.028REF L1 0.300 0.600 0.012 0.024 θ 0° 8° 0° 8° SGM811/812 PACKAGE OUTLINE DIMENSIONS SOT143- 4 D C S Symbol E H e2 B B1 Dimensions In Millimeters Min Max A 0.890 1.120 A1 0.013 0.100 B 0.760 0.940 L e1 B1 0.370 0.510 C 0.085 0.180 D 2.800 3.040 E 1.200 1.400 e1 e2 H L 0.200 BSC 2.100 2.640 0.55 REF 0.450 0.600 A1 A S 1.920 BSC ９ SGM811/812