SGM800-2.93YN5G/TR

SGM800 Low-Power, SOT µP Reset Circuit with Capacitor-Adjustable Reset Timeout Delay GENERAL DESCRIPTION FEATURES The SGM800 low-power micro-processor supervisor ● Monitor System Voltages from 1.6V to 5V circuit monitors system voltages from 1.6V to 5V. This ● Capacitor-Adjustable Reset Timeout Period device performs a single function: it asserts a reset ● Low Quiescent Current: 3µA (TYP) signal whenever the VCC supply voltage falls below its ● Open-Drain RESET Output Option reset threshold. The reset output remains asserted for ● Guaranteed RESET Valid to VCC = 1V the reset timeout period after VCC rises above the reset ● Immune to Short VCC Transients threshold. The reset timeout is externally set by a ● Available in Green SOT-23-5 Package capacitor to provide more flexibility. The SGM800 has an active-low, open-drain reset output. It is available in Green SOT-23-5 package and operates over a temperature range of -40℃ to +85℃. APPLICATIONS Portable Equipment Battery-Powered Computers/Controllers Automotive Medical Equipment Intelligent Instruments Embedded Controllers Critical µP Monitoring Set-Top Boxes Computers TYPICAL APPLICATION VCC VCC SGM800 SRT CSRT SG Micro Corp www.sg-micro.com GND RESET Microprocessor System RESET GND JANUARY 2013 – REV. A. 1 Low-Power, SOT µP Reset Circuit with Capacitor-Adjustable Reset Timeout Delay SGM800 PACKAGE/ORDERING INFORMATION MODEL SGM800 PACKAGE DESCRIPTION RESET THRESHOLD (V) ORDERING NUMBER PACKAGE MARKING PACKING OPTION 1.63 SGM800-1.63YN5G/TR S69XX Tape and Reel, 3000 2.32 SGM800-2.32YN5G/TR S6AXX Tape and Reel, 3000 2.63 SGM800-2.63YN5G/TR S6BXX Tape and Reel, 3000 2.93 SGM800-2.93YN5G/TR S6CXX Tape and Reel, 3000 SOT-23-5 MARKING INFORMATION NOTE: XX = Date Code. YYY X X Date Code - Month Date Code - Year Serial Number Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If you have additional comments or questions, please contact your SGMICRO representative directly. ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND VCC ....................................................................... -0.3V to 6V RESET (Open-Drain) .......................................... -0.3V to 6V Input Current (All Pins) ................................................. 20mA Output Current ( RESET ) ............................................... 20mA Junction Temperature .................................................+150℃ Storage Temperature Range ....................... -65℃ to +150℃ Lead Temperature (Soldering, 10s) ............................+260℃ ESD Susceptibility HBM ............................................................................. 3000V MM ................................................................................. 300V RECOMMENDED OPERATING CONDITIONS Operating Temperature Range ....................... -40℃ to +85℃ OVERSTRESS CAUTION Stresses beyond those listed may cause permanent damage to the device. Functional operation of the device at these or any other conditions beyond those indicated in the operational section of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. ESD SENSITIVITY 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. DISCLAIMER SG Micro Corp reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. SG Micro Corp www.sg-micro.com JANUARY 2013 2 Low-Power, SOT µP Reset Circuit with Capacitor-Adjustable Reset Timeout Delay SGM800 PIN CONFIGURATION SGM800 (TOP VIEW) SRT 1 GND 2 NC 3 5 RESET 4 VCC SOT-23-5 PIN DESCRIPTION PIN NAME FUNCTION 1 SRT Set Reset Timeout Input. Connect a capacitor between SRT and ground to set the timeout period. Determine the period as follows: 6 -6 tRP = 2.6 × 10 × CSRT + 340 × 10 with tRP in seconds and CSRT in farads. 2 GND Ground. 3 NC Not Internally Connected. Can be connected to GND. 4 VCC Supply Voltage and Reset Threshold Monitor Input. 5 RESET SG Micro Corp www.sg-micro.com RESET changes from high to low whenever VCC drops below the selected reset threshold voltage. RESET remains low for the reset timeout period after VCC exceeds the reset threshold. JANUARY 2013 3 Low-Power, SOT µP Reset Circuit with Capacitor-Adjustable Reset Timeout Delay SGM800 ELECTRICAL CHARACTERISTICS (VCC = 1V to 5.5V, TA = -40℃ to +85℃, typical values are at VCC = 5V and TA = +25℃, unless otherwise specified.) PARAMETER Supply Voltage Range Supply Current SYMBOL CONDITIONS VCC ICC MIN 1.0 Hysteresis VTH tRD Reset Timeout Period tRP VSRT Ramp Current VSRT Ramp Threshold RESET Output Voltage Low RESET Output Leakage Current, Open-Drain SG Micro Corp www.sg-micro.com IRAMP VTH-RAMP VOL ILKG UNITS 5.5 V 3.9 7.0 VCC ≤ 3.3V 3.4 5.5 3.0 VTH - 2.5% VTH + 2.5% TA = -40℃ to +85℃ VTH - 3.5% VTH + 3.5% VCC falling at 1mV/µs CSRT = 1500pF 3.00 μA 4.8 TA = +25℃ VHYST VCC to Reset Delay MAX VCC ≤ 5.0V VCC ≤ 2.0V VCC Reset Threshold Accuracy TYP V 4 × VTH mV 80 µs 4.25 5.75 ms CSRT = 0 0.34 VSRT = 0 to 0.65V, VCC = 1.6V to 5V 210 nA VCC = 1.6V to 5V (VRAMP rising) 0.6 V VCC ≥ 1.0V, ISINK = 50µA 0.3 VCC ≥ 2.7V, ISINK = 1.2mA 0.3 VCC ≥ 4.5V, ISINK = 3.2mA 0.4 VCC > VTH, reset not asserted 1 V µA JANUARY 2013 4 Low-Power, SOT µP Reset Circuit with Capacitor-Adjustable Reset Timeout Delay SGM800 TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V, CSRT = 1500pF, TA = +25℃, unless otherwise noted. Supply Current vs. Supply Voltage Reset Timeout Period vs. CSRT 5 10000 Reset Timeout Period (ms) +85℃ Supply Current (μA) 4 3 +25℃ 2 -40℃ 1 V T H = 1.63V 0 0 1 2 3 4 5 1000 100 10 1 0.1 0.01 6 0.1 1 460 420 380 340 1.006 1000 5.0 CSRT = 1500pF 4.8 4.6 4.4 4.2 4.0 -25 0 25 50 75 -50 100 -25 0 25 50 75 100 Temperature (℃) Temperature (℃) Normalized Reset Threshold vs. Temperature Maximum Transient Duration vs. Reset Threshold Overdrive 60 1.004 Transient Duration (µs) Normalized Reset Threshold Reset Timeout Period (ms) Reset Timeout Period (μs) CSRT = 0 300 -50 100 Reset Timeout Period vs. Temperature Reset Timeout Period vs. Temperature 500 10 CSRT (nF) Supply Voltage (V) 1.002 1.000 0.998 0.996 0.994 -50 -25 0 25 50 Temperature (℃) SG Micro Corp www.sg-micro.com 75 100 V T H = 2.93V 50 40 30 20 10 0 0 200 400 600 800 1000 Reset Threshold Overdrive (mV) JANUARY 2013 5 SGM800 Low-Power, SOT µP Reset Circuit with Capacitor-Adjustable Reset Timeout Delay TYPICAL PERFORMANCE CHARACTERISTICS (continued) VCC = 5V, CSRT = 1500pF, TA = +25℃, unless otherwise noted. SG Micro Corp www.sg-micro.com JANUARY 2013 6 SGM800 Low-Power, SOT µP Reset Circuit with Capacitor-Adjustable Reset Timeout Delay DETAILED DESCRIPTION Reset Output The reset output is typically connected to the reset input of a µP. A µP’s reset input starts or restarts the µP in a known state. The SGM800 µP supervisory circuit provides the reset logic to prevent code-execution errors during power-up, power-down, and brownout conditions. RESET changes from high to low whenever VCC drops below the threshold voltage. Once VCC exceeds the threshold voltage, RESET remains low for the capacitor- adjustable reset timeout period. This device output is guaranteed valid for VCC > 1V. The SGM800 is open-drain RESET output. Connect an external pull-up resistor to any supply from 0 to 5.5V. Select a resistor value large enough to register a logic low when RESET is asserted and small enough to register a logic high while supplying all input current and leakage paths connected to the RESET line. A 10kΩ to 100kΩ pull up is sufficient in most applications. Selecting a Reset Capacitor The reset timeout period is adjustable to accommodate a variety of µP applications. Adjust the reset timeout period (tRP) by connecting a capacitor (CSRT) between SRT and ground. Calculate the reset timeout capacitor as follows: -6 6 CSRT = (tRP - 340 × 10 ) / (2.6 × 10 ) where tRP is in seconds and CSRT is in farads. The reset delay time is set by a current/capacitorcontrolled ramp compared to an internal 0.6V reference. An internal 210nA ramp current source charges the external capacitor. The charge to the capacitor is cleared when a reset condition is detected. Once the reset condition is removed, the voltage on the capacitor ramps according to the formula: dV/dt = I/C. The CSRT capacitor must ramp to 0.6V to deassert the reset. CSRT must be a low-leakage (