TS3809/3810 Series Taiwan Semiconductor Microprocessor Reset Circuit GENERAL DESCRIPTION FEATURES The TS3809/3810 series are used for microprocessor ● High Accurate ±2% (µP) supervisory circuits to monitor the power supplies ● Precision monitoring of +3V, +3.3V, and +5V external ● Fully specified over temperature components and adjustments when used with +5V, ● Available in three output configurations +3.3V, +3.0V, +2.5V powered circuits. ● Push-Pull RESET low output (TS3809) These circuits perform a single function: they assert a ● Push-Pull (RESET) high output (TS3810) reset signal whenever the VCC supply voltage declines ● 200ms typ. Power-on reset pulse width below a preset threshold, keeping it asserted for at least ● 25µs supply current 200ms after VCC has risen above the reset threshold. ● Guaranteed reset valid to VCC=+1V Reset thresholds suitable for operation with a variety of ● Power supply transient immunity supply voltages are available. TS3809/3810 series have APPLICATION in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating Power supply voltage push pull outputs. TS3809 series has an active low RESET output, while the TS3810 has an active high RESET output The reset comparator is designed to ● Battery-operated systems and controllers ● Intelligent instruments ● Critical µP and µC power monitoring ignore fast transients on VCC, and the outputs are ● Portable / Battery powered equipment guaranteed to be in the correct logic state for VCC down ● Automotive to 1.0V. Low supply current makes TS3809/3810 series ideal for use in portable equipment. SOT-23 Pin Definition TS3809 TS3810 1. GND 1. GND 2. RESET 2. (RESET) 3. VCC 3. VCC TYPICAL APPLICATIN CIRCUIT Document Number: DS_P0000206 1 Version: E15 TS3809/3810 Series Taiwan Semiconductor ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL LIMIT UNIT VCC GND - 0.3 to GND +6.5 V VRESET GND - 0.3 to VCC +0.3 V Input Current, VCC ICC 20 mA Output Current, RESET, (RESET) IO 5 mA Power Dissipation PD (TJ-TA)/RθJA mW TJ.OPR -40 ~ +125 o TSTG -65 ~ +150 o TLEAD 10 s SYMBOL MAXIMUM UNIT RθJC 110 ºC/W RθJA 250 ºC/W Terminal Voltage (with respect to GND) RESET & (RESET) push-pull Operating Junction Temperature Range Storage Temperature Range o Lead Soldering Temperature (260 C) C C THERMAL PERFORMANCE PARAMETER Thermal Resistance from Junction to Case Thermal Resistance from Junction to Ambient (Note 1) ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°C unless otherwise noted) PARAMETER CONDITIONS o o SYMBOL MIN TYP MAX UNIT Input Supply Voltage TA=-40 C~+85 C VCC 1.0 -- 6 V Supply Current VCC=VTH + 1V ICC -- 25 35 µA TS3809/3810CXA 4.54 4.63 4.71 TS3809/3810CXB 4.29 4.38 4.46 TS3809/3810CXC 3.92 4.00 4.08 3.02 3.08 3.15 TS3809/3810CXE 2.87 2.93 3.00 TS3809/3810CXF 2.57 2.63 2.69 TS3809/3810CXG 2.20 2.25 2.30 Reset Threshold Reset Threshold TS3809/3810CXD VTH V o TA=0~+85ºC VTHT -- 50 -- ppm/ C Set-up Time VCC = 0 ~ (VTH - 100mV) TSET 1 -- -- µs VCC to Reset Delay VCC = VTH ~ (VTH - 100mV) TRD -- 20 -- µs TDELAY 140 200 260 ms VOL -- -- 0.3 V VOH 0.8 VCC -- -- V VOL -- -- 0.3 V Temperature Coefficient Reset Active Timeout Period TA=0~+85ºC 1.8V<VCC<VTH(MAX), RESET Output (TS3809) ISINK =1.2mA Voltage Low 1.2V<VCC<1.8V, ISINK =50µA RESET Output (TS3809) VCC > VTH(MAX), Voltage High ISOURCE =500µA (RESET) Output (TS3810) Voltage Low VCC > VTH(MAX), ISINK =1.2mA Document Number: DS_P0000206 2 Version: E15 TS3809/3810 Series Taiwan Semiconductor ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°C unless otherwise noted) PARAMETER CONDITIONS (RESET) Output (TS3810) 1.8V<VCC<VTH(MAX), Voltage High ISOURCE =500µA 1.2V<VCC<1.8V, SYMBOL MIN TYP MAX UNIT VOH 0.8 VCC -- -- V VHVS -- 40 -- mV ISOURCE =150µA Hysteresis at VCC Input Voltage Note : 1. RθJA is measured the PCB copper area of approximately 1in2 (Multi-layer). Needs to connect to VSS pin. Document Number: DS_P0000206 3 Version: E15 TS3809/3810 Series Taiwan Semiconductor ORDERING INFORMATION RESET VOLTAGE PART NO. PACKAGE PACKING 4.63V TS3809CXA RFG SOT-23 3,000pcs / 7” Reel 4.38V TS3809CXB RFG SOT-23 3,000pcs / 7” Reel 4.00V TS3809CXC RFG SOT-23 3,000pcs / 7” Reel 3.08V TS3809CXD RFG SOT-23 3,000pcs / 7” Reel 2.93V TS3809CXE RFG SOT-23 3,000pcs / 7” Reel 2.63V TS3809CXF RFG SOT-23 3,000pcs / 7” Reel 2.25V TS3809CXG RFG SOT-23 3,000pcs / 7” Reel 4.63V TS3810CXA RFG SOT-23 3,000pcs / 7” Reel 4.38V TS3810CXB RFG SOT-23 3,000pcs / 7” Reel 4.00V TS3810CXC RFG SOT-23 3,000pcs / 7” Reel 3.08V TS3810CXD RFG SOT-23 3,000pcs / 7” Reel 2.93V TS3810CXE RFG SOT-23 3,000pcs / 7” Reel 2.63V TS3810CXF RFG SOT-23 3,000pcs / 7” Reel 2.25V TS3810CXG RFG SOT-23 3,000pcs / 7” Reel Note: 1. Compliant to RoHS Directive 2011/65/EU and in accordance to WEEE 2002/96/EC. 2. Halogen-free according to IEC 61249-2-21 definition. BLOCK DIAGRAM Document Number: DS_P0000206 4 Version: E15 TS3809/3810 Series Taiwan Semiconductor CHARACTERISTICS CURVES (TC = 25°C unless otherwise noted) Figure 1. Threshold Voltage vs. Temperature Figure 2. TDELAY vs. Temperature Figure 3. Supply Current vs. Temperature Figure 4. Supply Current vs. Threshold Voltage Figure 5. Power-Down TDELAY vs. Temperature Figure 6. Output Voltage vs. Output Current Document Number: DS_P0000206 5 Version: E15 TS3809/3810 Series Taiwan Semiconductor APPLICATION INFORMATION Negative-Going VCC transients in addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, the TS3809/3810 are relatively immune to short-duration negative-going VCC transients (glitches). The TS3809/3810 does not generate a reset pulse. The graph was generated using a negative going pulse applied to VCC, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 20µS or less will not cause a reset pulse. A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. FUNCTION DESCRIPTION A microprocessor’s reset input starts the µP in a known state. The TS3809/3810 assert reset to prevent codeexecution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The TS3809/3810 have a push-pull output stage. ENSURING A VALID RESET OUTPUT DOWN TO VCC=0 RESET is guaranteed to be a logic low for VCC > 1.0V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VCC dips below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer starts after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. When VCC falls below 1V, the TS3809/3810 reset output no longer sinks current - it becomes an open circuit. Therefore, high impedance CMOS logic input connected to reset can drift to undetermined voltages. This present no problem in most applications since most µP and other circuitry is inoperative with VCC below 1V.However, in applications where reset must be valid down to 0V, adding a pull down resistor to reset causes and stray leakage currents to flow to ground, holding reset low (Figure 2.) R1’s value is not critical; 100K is large enough not to load reset and small enough to pull RESET to ground. For the TS3809/3810 if reset is required to remain valid for VCC <1V. BENEFITS OF HIGHLY ACCURATE RESET THRESHOLD Most µP supervisor ICs has 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. 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 many or may not be asserted. TIMMING DIAGRAM Document Number: DS_P0000206 6 Version: E15 TS3809/3810 Series Taiwan Semiconductor PACKAGE OUTLINE DIMENSIONS (Unit: Millimeters) SOT-23 SUGGESTED PAD LAYOUT (Unit: Millimeters) MARKING DIAGRAM PART NO. IDENTIFICATION CODE PART NO. IDENTIFICATION CODE TS3809CXA CA TS3810CXA CH TS3809CXB CB TS3810CXB CI TS3809CXC CC TS3810CXC CJ TS3809CXD CD TS3810CXD CK TS3809CXE CE TS3810CXE CL TS3809CXF CF TS3810CXF CM TS3809CXG CG TS3810CXG CN Document Number: DS_P0000206 7 Version: E15 TS3809/3810 Series Taiwan Semiconductor Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale. Document Number: DS_P0000206 8 Version: E15